購買 OP727AR | OP727AR數據表 | Heisener.com
聯繫我們
SalesDept@heisener.com 86-755-83210559-817

OP727AR

hot OP727AR

OP727AR

僅供參考

零件編號 OP727AR
製造商 Analog Devices Inc.
描述 IC OPAMP GP 700KHZ RRO 8SOIC
數據表

OP727AR 數據表

封裝 8-SOIC (0.154", 3.90mm Width)
ECAD
庫存 11,640 piece(s)
單價 $ 2.6804 *
交貨期 可立即發貨
預計送達時間 五月 30 - 六月 4 (選擇速遞服務)
請求報價
支付方式
送貨服務
  • 我們提供的 OP727AR 具有全球市場競爭力的價格,如有需要請發送詢價單給我們。謝謝!
  • 添加 OP727AR 及其數量至BOM以便提交您的報價請求。 Heisener.com 無需註冊便可以提交 OP727AR 的報價請求。

OP727AR參數

製造商Analog Devices Inc.
類別積體電路 (IC) - 線性 - 放大器 - 儀表、運算放大器、緩衝放大器
封裝8-SOIC (0.154", 3.90mm Width)
ECAD
系列-
放大器類型General Purpose
電路數量2
輸出類型Rail-to-Rail
擺率0.2 V/µs
增益帶寬產品700kHz
-3db帶寬-
電流 - 輸入偏差5nA
電壓 - 輸入偏移30µV
供電320µA
電流 - 輸出/通道30mA
電壓 - 電源,單/雙(±)2.7 V ~ 30 V, ±1.35 V ~ 15 V
工作溫度-40°C ~ 85°C
安裝類型Surface Mount
包/箱8-SOIC (0.154", 3.90mm Width)
供應商設備包8-SOIC

OP727AR數據表

OP727AR Packaging

Customized Labels
Sealing
Packing
Insepction

OP727AR FAQ

  • 1. How to order OP727AR on Heisener?
    Currently, Heisener only provide peer-to-peer order processing. While you submit the RFQ, our professional agent will contact you with the competitive prices in the global market, and our agent will prompt you to finish the order if you accept our offers.
  • 2. How does Heisener guarantee that OP727AR is from the original manufacturer or authorized agents?
    We have a professional and experienced quality control team to strictly verify and test the OP727AR. All suppliers must pass our qualification reviews before they can publish their products including OP727AR on Heisener; we pay more attention to the channels and quality of OP727AR products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
  • 3. Are the OP727AR price and inventory displayed accurate?
    The price and inventory of OP727AR fluctuates frequently and cannot be updated in time, it will be updated periodically within 24 hours. And, our quotation usually expires after 5 days.
  • 4. What forms of payment are accepted?
    Wire Transfer, PayPal, Alipay, Wechat, Credit Card, Western Union, MoneyGram, and Escrow are all acceptable.
    Warm Tips: Some orders in certain payment forms may require handling fee.
  • 5. How is the shipping arranged?
    Customers can choose industry-leading freight companies, including DHL, UPS, FedEx, TNT, and Registered Mail. Shipping insurance is also available.
    Once your order has been processed for shipment, our salesperson will send you an email advising you of the shipping status and tracking number.
    Warm Tips: It may take up to 24 hours for the carriers to display tracking information. Usually, express delivery takes 3-5 days, and registered mail takes 25-60 days.
  • 6. What is the process for return or replacement of OP727AR?
    All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the OP727AR we delivered, we will accept the replacement or return of the OP727AR only when all of the below conditions are fulfilled:
    (1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
    (2)We are informed of the defect described above within 90 days after the delivery of OP727AR.
    (3)The PartNo is unused and only in the original unpacked packaging.
    Two processes to return the products:
    (1)Inform us within 90 days
    (2)Obtain Requesting Return Authorizations
  • 7.How to contact us to get technical supports, such as OP727AR pin diagram, OP727AR datasheet?
    If you need any after-sales service, please do not hesitate to contact us.

OP727AR相關產品

TAP224M050SRW TAP224M050SRW AVX Corporation, CAP TANT 0.22UF 50V 20% RADIAL, Radial, - 查看
L01-6363 L01-6363 Amgis, LLC, XFRMR TOROIDAL 25VA THRU HOLE, -, - 查看
8N4SV76KC-0129CDI 8N4SV76KC-0129CDI IDT, Integrated Device Technology Inc, IC OSC VCXO 187.5MHZ 6-CLCC, 6-CLCC, - 查看
BZW04-23B-E3/73 BZW04-23B-E3/73 Vishay Semiconductor Diodes Division, TVS DIODE 23.1VWM 37.5VC DO204AL, DO-204AL, DO-41, Axial, - 查看
G-1132-0000 G-1132-0000 CW Industries, SWITCH SLIDE SPDT 11A 125V, -, - 查看
MS-EX-1 MS-EX-1 Panasonic Industrial Automation Sales, MOUNTING BRACKET FOR EX-M2, -, - 查看
M55342K04B332ARWS M55342K04B332ARWS Vishay Dale, RES SMD 332 OHM 0.1% 0.15W 1505, 1505, - 查看
ERA-2AEB5761X ERA-2AEB5761X Panasonic Electronic Components, RES SMD 5.76KOHM 0.1% 1/16W 0402, 0402 (1005 Metric), - 查看
66331-6 66331-6 TE Connectivity AMP Connectors, CONN SKT .062 20-24AWG AU CRIMP, -, - 查看
8D711F04AC 8D711F04AC Souriau, 8D 4C 4#20 PIN J/N, -, - 查看
PT07SE12-8PY-SR PT07SE12-8PY-SR Amphenol Industrial Operations, PTSE 8C 8#20 PIN RECP, -, - 查看
ACB20DHRT ACB20DHRT Sullins Connector Solutions, CONN EDGE DUAL FMALE 40POS 0.050, -, - 查看

OP727AR 保證

Service Guarantee

服務保證

我們保證100%的客戶滿意度。

我們經驗豐富的銷售團隊和技術支持團隊支持我們的服務以滿足所有客戶。

Quality Guarantee

質量保證

我們提供90天保修。

如果您收到的物品質量不合格,我們將負責您的退款或更換,但物品必須以原始狀態退回。

全球供應鏈-可靠的授權分銷商資源

零件編號 製造商 描述 庫存

OP727ARZ-REEL7

D# V72:2272_06228492

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N T/R

RoHS: Compliant
0

OP727ARZ

D# E54:1762_00117725

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N Tube

RoHS: Compliant
0

OP727ARUZ-REEL

D# V72:2272_06228489

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin TSSOP T/R

RoHS: Compliant
0

OP727ARUZ

D# V36:1790_06228488

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin TSSOP Tube

RoHS: Compliant
0

OP727ARZ-REEL

D# V36:1790_06228491

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N T/R

RoHS: Compliant
0
零件編號 製造商 描述 庫存

OP727ARUZ

Analog Devices Inc

OP AMP, DUAL, 0.7MHZ, 0.2V/US, 8TSSOP

444

OP727AR-REEL7

Analog Devices Inc

N/A DUAL OP-AMP, 300 uV OFFSET-MAX, 0.7 MHz BAND WIDTH, PDSO8 SOIC-8

14988

OP727AR

Analog Devices Inc

OP AMP, DUAL, 0.7MHZ, 0.2V/US, 8TSSOP

444

OP727ARZ-REEL7

Analog Devices Inc

OP AMP DUAL GP R-R O/P 15V/30V 8SOIC N - Tape and Reel

0

OP727ARZ-REEL

Analog Devices Inc

OP AMP DUAL GP R-R O/P 15V/30V 8SOIC N - Tape and Reel

0

OP727AR-REEL

Analog Devices Inc

N/A DUAL OP-AMP, 300 uV OFFSET-MAX, 0.7 MHz BAND WIDTH, PDSO8 SOIC-8

5000

OP727ARUZ-REEL

Analog Devices Inc

OP AMP DUAL GP R-R O/P 15V/30V 8TSSOP - Tape and Reel

5000

OP727ARZ

Analog Devices Inc

OP AMP, DUAL MICROPOWER RRO/P, SOIC

501
零件編號 製造商 描述 庫存

OP727ARZ

D# C1S103100173062

Analog Devices Inc

OP Amp Dual GP R-R O/P }15V/30V 8-Pin SOIC N Tube

RoHS: Compliant
pbFree: Yes
Min Qty: 1
Container: Tube
594
零件編號 製造商 描述 庫存

OP727ARUZ

Analog Devices Inc

RoHS: Compliant
0
零件編號 製造商 描述 庫存

OP727ARUZ

Analog Devices Inc

RoHS (ship within 1day) - D/C

2
零件編號 製造商 描述 庫存

OP727ARUZ-REEL

D# OP727ARUZ-REELCT-ND

Analog Devices Inc

IC OPAMP GP 2 CIRCUIT 8TSSOP

5548

OP727ARZ-REEL

D# OP727ARZ-REELTR-ND

Analog Devices Inc

IC OPAMP GP 2 CIRCUIT 8SOIC

0

OP727ARU-REEL

D# 2156-OP727ARU-REEL-ADTR-ND

Rochester Electronics LLC

IC GP OPAMP 2 CIRCUIT 8TSSOP

7337

OP727ARUZ

D# OP727ARUZ-ND

Analog Devices Inc

IC OPAMP GP 2 CIRCUIT 8TSSOP

2025

OP727ARZ

D# OP727ARZ-ND

Analog Devices Inc

IC OPAMP GP 2 CIRCUIT 8SOIC

293

OP727AR

D# 2156-OP727AR-AD-ND

Rochester Electronics LLC

IC GP OPAMP 2 CIRCUIT 8SOIC

4030

OP727ARZ-REEL7

D# OP727ARZ-REEL7CT-ND

Analog Devices Inc

IC OPAMP GP 2 CIRCUIT 8SOIC

2869

OP727AR-REEL7

D# 2156-OP727AR-REEL7-ND

Rochester Electronics LLC

IC GP OPAMP 2 CIRCUIT 8SOIC

14988

OP727AR-REEL

D# 2156-OP727AR-REEL-ND

Rochester Electronics LLC

IC GP OPAMP 2 CIRCUIT 8SOIC

10407

OP727ARU

D# 2156-OP727ARU-AD-ND

Rochester Electronics LLC

IC GP OPAMP 2 CIRCUIT 8TSSOP

887
零件編號 製造商 描述 庫存

OP727ARU

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARZ-REEL

Analog Devices Inc

In stock shipping within 2days

1000

OP727AR-REEL

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARU-REEL

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARUZ-REEL

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARZ

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARUZ

Analog Devices Inc

In stock shipping within 2days

1000

OP727AR

Analog Devices Inc

In stock shipping within 2days

1000

OP727ARZ-REEL7

Analog Devices Inc

In stock shipping within 2days

15500
零件編號 製造商 描述 庫存

OP727ARUZ

D# 2305636

Analog Devices Inc

OP AMP, DUAL, 0.7MHZ, 0.2V/US, 8TSSOP

RoHS: Compliant
Min Qty: 1
Container: Each
0

OP727ARZ

D# 9994432

Analog Devices Inc

OP AMP, DUAL MICROPOWER RRO/P, SOIC

RoHS: Compliant
Min Qty: 1
Container: Each
0
零件編號 製造商 描述 庫存

OP727ARZ

OEM/CM QUOTES ONLY | NO BROKERS

6000

OP727AR

Rochester Electronics LLC

OEM/CM QUOTES ONLY | NO BROKERS

4836

OP727ARU

Rochester Electronics LLC

OEM/CM QUOTES ONLY | NO BROKERS

1169

OP727ARUREEL

Rochester Electronics LLC

OEM/CM QUOTES ONLY | NO BROKERS

8948

OP727ARUZ

Analog Devices Inc

OEM/CM QUOTES ONLY | NO BROKERS

2047

OP727ARZREEL7

Analog Devices Inc

OEM/CM QUOTES ONLY | NO BROKERS

18288

OP727ARUZREEL

OEM/CM QUOTES ONLY | NO BROKERS

6000

OP727ARREEL

Rochester Electronics LLC

OEM/CM QUOTES ONLY | NO BROKERS

12488

OP727ARZRELL7

Analog Devices Inc

OEM/CM QUOTES ONLY | NO BROKERS

924

OP727ARREEL7

Rochester Electronics LLC

OEM/CM QUOTES ONLY | NO BROKERS

17986
零件編號 製造商 描述 庫存

OP727ARUREEL

Analog Devices Inc

OEM/CM ONLY

2862

OP727ARU

Analog Devices Inc

OEM/CM ONLY

453

OP727ARUZND

Analog Devices Inc

OEM/CM ONLY

2864

OP727ARUZREEL7

Analog Devices Inc

OEM/CM ONLY

2866

OP727ARZREEL7

Analog Devices Inc

OEM/CM ONLY

614

OP727ARUZREEL

Analog Devices Inc

OEM/CM ONLY

928

OP727ARZPBF

Analog Devices Inc

OEM/CM ONLY

594

OP727ARREEL7

Texas Instruments

OEM/CM ONLY

199

OP727ARREEL

Analog Devices Inc

OEM/CM ONLY

724

OP727ARZ

Analog Devices Inc

OEM/CM ONLY

563

OP727ARZREEL

Texas Instruments

OEM/CM ONLY

333

OP727ARUZ

Analog Devices Inc

OEM/CM ONLY

609

OP727ARZND

Analog Devices Inc

OEM/CM ONLY

2868

OP727AR

Analog Devices Inc

OEM/CM ONLY

128
零件編號 製造商 描述 庫存

OP727ARUZ

Analog Devices Inc

in stock - can ship the same day

37
零件編號 製造商 描述 庫存

OP727ARZ-REEL7

ADI Electronics Inc

OEM/CM Immediate delivery

15240

OP727ARZ

ADI Electronics Inc

OEM/CM Immediate delivery

256

OP727ARUZ

ADI Electronics Inc

OEM/CM Immediate delivery

76

OP727AR

ADI Electronics Inc

OEM/CM Immediate delivery

56820
零件編號 製造商 描述 庫存

OP727ARZ-REEL7

D# 584-OP727ARZ-R7

Analog Devices Inc

Precision Amplifiers DUAL PRECISION RAIL-RAIL OP AMP

RoHS: Compliant
902

OP727ARZ

D# 584-OP727ARZ

Analog Devices Inc

Precision Amplifiers DUAL PRECISION RAIL-RAIL OP AMP

RoHS: Compliant
433

OP727ARUZ-REEL

D# 584-OP727ARUZ-R

Analog Devices Inc

Precision Amplifiers DUAL PRECISION RAIL-RAIL OP AMP

RoHS: Compliant
19894

OP727ARUZ

D# 584-OP727ARUZ

Analog Devices Inc

Precision Amplifiers DUAL PRECISION RAIL-RAIL OP AMP

RoHS: Compliant
1385
零件編號 製造商 描述 庫存

OP727ARZ

D# 31M5791

Analog Devices Inc

Operational Amplifier, Dual, 7 kHz, 2, 0.2 V/ s, 2.7V to 30V, SOIC, 8 RoHS Compliant: Yes

RoHS: Compliant
Min Qty: 1
Container: Bulk
0
零件編號 製造商 描述 庫存

OP727ARZ

D# NS-OP727ARZ

Analog Devices Inc

OEM/CM ONLY

3650

OP727AR-REEL

D# NS-OP727AR-REEL

Analog Devices Inc

OEM/CM ONLY

5161

OP727ARUZ

D# NS-OP727ARUZ

Analog Devices Inc

OEM/CM ONLY

4520

OP727AR

D# NS-OP727AR

Analog Devices Inc

OEM/CM ONLY

5359

OP727ARU

D# NS-OP727ARU

Multiple

OEM/CM ONLY

2658

OP727ARZ-REEL7

D# NS-OP727ARZ-REEL7

Analog Devices Inc

OEM/CM ONLY

8558

OP727ARU-REEL

D# NS-OP727ARU-REEL

Multiple

OEM/CM ONLY

7938

OP727ARZ-REEL

D# NS-OP727ARZ-REEL

Analog Devices Inc

OEM/CM ONLY

9945

OP727ARUZ-REEL

D# NS-OP727ARUZ-REEL

Analog Devices Inc

OEM/CM ONLY

6644

OP727AR-REEL7

D# NS-OP727AR-REEL7

Analog Devices Inc

OEM/CM ONLY

7954
零件編號 製造商 描述 庫存

OP727AR

Analog Devices Inc

Operational Amplifier, Dual AMP, Bipolar, 8 Pin, Plastic, SOP

35

OP727ARU

Analog Devices Inc

OPERATIONAL AMPLIFIER, 2 FUNC, 300UV OFFSET-MAX, BIPOLAR, PDSO8

573

OP727ARUZ

Analog Devices Inc

1
零件編號 製造商 描述 庫存

OP727ARUZ-REEL

D# 7593105

Analog Devices Inc

OP727ARUZ-REEL Analog Devices, Precision, Op Amp, RRO, 700kHz, 3 30 V, 8-Pin TSSOP, EA

Min Qty: 1
Container: Bulk
3068

OP727ARZ

D# 4973211

Analog Devices Inc

OP727ARZ Analog Devices, Op Amp, RRO, 700kHz, 3 28 V, 8-Pin SOIC, EA

Min Qty: 1
Container: Bulk
52

OP727ARUZ

D# 4973205

Analog Devices Inc

OP727ARUZ Analog Devices, Op Amp, RRO, 700kHz, 3 28 V, 8-Pin TSSOP, EA

Min Qty: 1
Container: Bulk
44
零件編號 製造商 描述 庫存

OP727ARUZ

D# OP727ARUZ

Analog Devices Inc

LINEAR ICS, OTHER

RoHS: Compliant
0
零件編號 製造商 描述 庫存

OP727ARZ

Analog Devices Inc

OP727 - Precision Micropower Single-Supply Operational Amplifier

RoHS: Compliant
1145

OP727ARU-REEL

Analog Devices Inc

Precision Micropower Single-Supply Operational Amplifier

RoHS: Not Compliant
7337

OP727AR

Analog Devices Inc

OP727 - Precision Micropower Single-Supply Operational Amplifier

RoHS: Not Compliant
4030

OP727ARZ-REEL7

Analog Devices Inc

OP727 - Precision Micropower Single-Supply Operational Amplifier

RoHS: Compliant
44

OP727AR-REEL7

Analog Devices Inc

OP727 - Precision Micropower Single-Supply Operational Amplifier

RoHS: Not Compliant
14988

OP727AR-REEL

Analog Devices Inc

OP727 - Precision Micropower Single-Supply Operational Amplifier

RoHS: Not Compliant
10407

OP727ARU

Analog Devices Inc

Precision Micropower Single-Supply Operational Amplifier

RoHS: Not Compliant
887
零件編號 製造商 描述 庫存

OP727ARZREEL

Analog Devices Inc

OEM/CM ONLY

626

OP727ARZ

Analog Devices Inc

OEM/CM ONLY

388

OP727ARUREEL

Analog Devices Inc

OEM/CM ONLY

222

OP727AR

Analog Devices Inc

OEM/CM ONLY

293

OP727ARU

Analog Devices Inc

OEM/CM ONLY

635

OP727ARZREEL7

Analog Devices Inc

OEM/CM ONLY

15256

OP727ARZRELL7

Analog Devices Inc

OEM/CM ONLY

786

OP727ARUZ

Analog Devices Inc

OEM/CM ONLY

164
零件編號 製造商 描述 庫存

OP727ARUZ

Analog Devices Inc

IN stock Immediate delivery

71

OP727ARZ

Analog Devices Inc

IN stock Immediate delivery

251

OP727AR

Analog Devices Inc

IN stock Immediate delivery

56805

OP727ARZ-REEL7

Analog Devices Inc

IN stock Immediate delivery

15255
零件編號 製造商 描述 庫存

OP727AR-REEL

Analog Devices Inc

shipping today

990

OP727ARZ

Texas Instruments

shipping today

1216

OP727AR

Analog Devices Inc

shipping today

288

OP727ARZ-REEL7

Analog Devices Inc

shipping today

2633

OP727ARU

Analog Devices Inc

shipping today

990

OP727ARU-REEL

Analog Devices Inc

shipping today

990

OP727ARZ-REEL

Analog Devices Inc

shipping today

990

OP727ARUZ

Analog Devices Inc

shipping today

990

OP727ARUZ-REEL

Analog Devices Inc

shipping today

990

OP727AR-REEL7

Analog Devices Inc

shipping today

1408
零件編號 製造商 描述 庫存

OP727ARZ-REEL

D# 27541775

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N T/R

RoHS: Compliant
0

OP727ARZ-REEL7

D# 44566679

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N T/R

RoHS: Compliant
0

OP727ARZ

D# 49746184

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin SOIC N Tube

RoHS: Compliant
0

OP727ARUZ-REEL

D# 51924416

Analog Devices Inc

Op Amp Dual Precision Amplifier R-R O/P ±15V/30V 8-Pin TSSOP T/R

RoHS: Compliant
0
零件編號 製造商 描述 庫存

OP727ARZ

mfr

RFQ

11313

OP727ARUZ

mfr

RFQ

8098
零件編號 製造商 描述 庫存

OP727ARZ-REEL7

Analog Devices Inc

Precision Micropower Single-Supply Operational Amplifiers

2500

OP727ARZ

Analog Devices Inc

IC OPAMP GP 700KHZ RRO 8SOIC

900
零件編號 製造商 描述 庫存

OP727ARZ

D# 9994432

Analog Devices Inc

OP AMP, DUAL MICROPOWER RRO/P, SOIC

RoHS: Compliant
Min Qty: 1
Container: Each
0

OP727ARUZ

D# 2305636

Analog Devices Inc

OP AMP, DUAL, 0.7MHZ, 0.2V/US, 8TSSOP

RoHS: Compliant
Min Qty: 1
Container: Each
0

Quick Inquiry

OP727AR

質量認證

黑森爾對質量的承諾,塑造了我們的採購、測試、運輸流程以及它們之間的每一步。這個基準是我們所銷售的每一個元器件的基礎。

ISO9001:2015, ICAS, IAF, UKAS

查看證書

聯繫我們

您有關於 OP727AR 的問題嗎?

OP727AR QRCode

掃描以查看此頁面

推薦產品

ICE3BR0665J

IC OFFLINE CTRLR SMPS OTP 8DIP

25LC128-I/ST

IC EEPROM 128KBIT 10MHZ 8TSSOP

MC74HC00ADR2G

IC GATE NAND 4CH 2-INP 14-SOIC

DD285N02K

RECTIFIER DIODE MODULE 400V 450A

MIC47100YMME

IC REG LINEAR POS ADJ 1A 8MSOP

ADP5054ACPZ-R7

IC REG CTRLR BUCK 48LFCSP

LT3480EDD#TRPBF

IC REG BUCK ADJ 2A 10DFN

TAJA106K016RNJ

CAP TANT 10UF 16V 10% 1206

MC14071BD

IC GATE OR 4CH 2-INP 14-SOIC

281934-2

WIRE SEAL

更多 »

OP727AR Tags

  • OP727AR
  • OP727AR PDF
  • OP727AR 數據表
  • OP727AR 規格
  • OP727AR 圖片
  • Analog Devices Inc.
  • Analog Devices Inc. OP727AR
  • 買OP727AR
  • OP727AR 價格
  • OP727AR 經銷商
  • OP727AR 供應商
  • OP727AR 批發

OP727AR可用於