华科chip R规格书(华科贴片电阻)

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

Table of Contents

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INDEX

How to Order (1)

Chip resistors Selection Guide (2)

General Purpose Chip Resistors ( 1Ω ~10MΩ ) (5)

Thick Film Low Ohm/ Power Low Ohm Chip Resistors ( 0.02Ω ~ 0.976Ω) (6)

Metal Low Ohm Current Sensing Chip resistors ( 0.001Ω ~ 0.050Ω) (7)

Chip Resistor Array:Convex Termination (8)

WA06W Chip Resistor Array 16P8R (9)

Chip Resistor Array:Concave Termination (10)

WT04X Chip Resistor Network (11)

WA04P Chip Attenuator (12)

Special Chip Resistors (13)

MR/SR Series of Automotive & Anti-Sulfuration Chip Resistors (13)

WR_R Series of Total Lead Free Chip Resistors (13)

WKxxM Series of Trimmable Chip Resistors (14)

WKxxV Series of High Voltage Chip Resistors (14)

WFxxP Series of High Power Chip Resistors (15)

WKxxS series of Surge Chip Resistors (15)

High Precision Chip Resistors (16)

Test and Requirements (17)

Packing on Tape and Reel (19)

Footprint Design (20)

Storage and Handling Condition (21)

Recommendation of Soldering Profiles (21)

* T he specifications are subject to change or our products in it may be discontinued without advance notice. Please check with our sales representatives or product engineers before ordering.

* T his catalog has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product specifications or transact the approval sheet for product specification before ordering.

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

Chip Resistors

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1. Detail product part number, functional code, tolerance combination,…... please refer to specific data sheet.

2. Example : ("_" means a blank)

Chip-R 0805 size, 4.3ohm, 5%, Normal type, SnPb termination, 5000pcs taped in reel : WR08X4R3_JTL

3. 1218 standard packing q'ty is 3Kpcs in 10" reel and packing code is T code

1

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

Chip Resistors http://

2■ Chip Resistor Selection Guide

■General Purpose Chip-R

2. Jumper resistor is not designed for fusing applications, designers shall apply dedicate fusible resistor or standard fuse in

3. WRxxW defines for ±1% < 10ohm or > 1Mohm.

application circuits.

■Thick Film Low Ohm Chip-R

2. Resistance value will be changed by soldering condition and design of soldering pad, please design products in consideration of this change.

■Thick Film Power Low Ohm Chip-R

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

3

Chip Resistors

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■ Metal Low Ohm Sensing Type Chip-R

Series Size

Rated Power

TCR (ppm/℃)*

Tolerance Resistance WW25N 2W ±100 ±1%, ±5% 1 ~ 25m ?*

WW25R 2W ±100 ±1%, ±5% 1, 2, 3, 4, 5, 6, 7, 10m ?

WW25M 1W

±100

±1%, ±5% 1 ~ 50m ?

*

WW25Q 2512 (6432)

1W

±100 ±1%, ±5% 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15m ? WW20N 2010 (5025) 1W ±75 ±1%, ±5% 5, 10, 15, 20m ? WW12N 1W ±70 ±1%, ±5% 5, 10, 15, 20, 25m ? WW12R 1W ±100 ±1%, ±5% 1, 4, 5, 6, 8, 10, 15m ? WW12D 1206 (3216) 1W ±100 ±1%, ±5% 20, 25, 30, 40, 50m ?

WW08R 0805 (2012) 1/2W ±100 ±1%, ±5% 4, 5, 10m ?

WW08D 0805 (2012) 1/2W ±100 ±1%, ±5% 20, 25, 30, 40, 50m ?

WW06R

0603 (1608) 1/3W

±100

±1%, ±5%

5, 10, 15m ?

Remark:

1. Detailed resistance vs. TCR and ordering code please refer to specific specifications.

2. Resistance value will be changed by soldering condition and design of soldering pad, please design products in consideration of this change.

2. Resistance value will be changed by soldering condition and design of soldering pad, please design products in consideration of this change.

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

Chip Resistors

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4

华新科技贴片电阻规格书 苏州宇泰电子：葛兵

5Chip Resistors

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华新科技贴片电阻规格书 苏州宇泰电子：葛兵

Chip Resistors

6

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■ Thick Film Low Ohm/Power Low Ohm Chip Resistors

■ Function For Low Ohm Chip Resistors

The low ohmic resistors are used to sense output current in power supply, automotive and engine control management system, and other power sensing application. As shows in figure below, the typical function of low ohmic (power) chip resistor is to be a current sensor (Rsense) to generate the sensing voltage (Vs) for the purpose of feedback control when output current (lo) passed on it . The sensing voltage be treated as a signal to trigger the switches (CMOS) ON/OFF duration so that to monitor and/or adjust the output current from inductor. Simplify to say, Vs=Io ×Rsense.

In general case, this feedback voltage is setting around 100mV for considering both on power saving and noise robustness. To sense a 5 ampere average output current, the Rsense resistance value therefore be required as 100mV / 5A = 20 m ?, the power dissipation will be : P=I2 ×R =5A2 ×20m ? =0.5Watt

A low ohmic chip resistor with a power rating of 1.0 watt is recommended on this application in case the power safety margin is taken into account.

■ Quick Reference Data of Low Ohm Chip Resistor

Series No.

WW25X WW20X WW18X WW10X WW12X WW08X WW06X WW04X Size code

2512 (6432)

2010 (5025)

1218 (3248)

1210 (3225)

1206 (3216)

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