Nanjing Shiheng Electronics Technology Co., Ltd. - Chip NTC Thermistor Datasheet
Product Overview
This document details the specifications for the CMFA series Chip NTC Thermistors manufactured by Nanjing Shiheng Electronics Technology Co., Ltd. These thermistors are designed for various applications requiring precise temperature sensing and control. Key features include high accuracy, stable performance, and a wide operating temperature range. They are suitable for use in electronic circuits where temperature monitoring is critical.
Product Attributes
- Brand: Shiheng
- Manufacturer: Nanjing Shiheng Electronics Technology Co., Ltd.
- Product Type: Chip NTC Thermistor
- Origin: China
Technical Specifications
Part Number: CMFA 503F3950
Date: 2021-08-21
General Specifications
| Parameter | Value | Unit |
|---|---|---|
| Nominal Resistance at 25 (R25) | 50 | k |
| B Constant (25/50) | 3950 | K |
| B Constant (25/85) | 3987 | K |
| Permissible Operating Current at 25 | 0.13 | mA |
| Dissipation Factor | 1.0 | mW/ |
| Thermal Time Constant | <5 | s |
| Rated Electric Power at 25 | 100 | mW |
| Operating Ambient Temperature | -40 to +125 |
Dimensions (Fig. 1 & Table 1)
| Type | L | W | T | a | A | B | C |
|---|---|---|---|---|---|---|---|
| [0603] | 0.063 0.006 [1.6 0.15] | 0.031 0.006 [0.8 0.15] | 0.031 0.006 [0.8 0.15] | 0.012 0.008 [0.3 0.2] | [0.6-0.8] | [0.6-0.7] | [0.6-0.8] |
Product Identification Breakdown
| Code | Description |
|---|---|
| CMF | Type: Chip NTC Thermistor |
| A | External Dimensions (LW): 2.001.250.85 (for CMFA series) |
| 503 | Nominal Zero-Power Resistance at 25: 50k |
| F | Tolerance of Resistance: 1% |
| 3950 | B Value Constant: 3950K |
Test Conditions
Standard Atmospheric Conditions:
- Ambient Temperature: 2015
- Relative Humidity: 6520%
- Air Pressure: 86 kPa to 106 kPa
Conditions for Disputed Results:
- Ambient Temperature: 252
- Relative Humidity: 655%
- Air Pressure: 86 kPa to 106 kPa
Inspection Equipment
- Visual Examination: 20 magnifier
- Resistance value test: Thermistor resistance tester
Reliability Test Summary
| Item | Standard | Requirements |
|---|---|---|
| Terminal Strength | IEC 60068-2-21 | No removal or split of the termination or other defects. |
| Resistance to Flexure | IEC 60068-2-21 | No visible damage. |R25/R25| 5% |
| Vibration | IEC 60068-2-80 | No visible damage. |
| Dropping | IEC 60068-2-32 | No visible damage. |
| Solderability | IEC 60068-2-58 | No visible damage; Wetting shall exceed 95% coverage. |
| Resistance to Soldering Heat | IEC 60068-2-58 | No visible damage. |R25/R25| 5%; |B/B| 2% |
| Temperature Cycling | IEC 60068-2-14 | No visible damage. |R25/R25| 3%; |B/B| 2% |
| Resistance to Dry Heat | IEC 60068-2-2 | No visible damage. |R25/R25| 5%; |B/B| 2% |
| Resistance to Cold | IEC 60068-2-1 | No visible damage. |R25/R25| 5%; |B/B| 2% |
| Resistance to Damp Heat | IEC 60068-2-78 | No visible damage. |R25/R25| 3%; |B/B| 2% |
| Resistance to High Temperature Load | IEC 60539-1 5.25.4 | No visible damage. |R25/R25| 5%; |B/B| 2% |
Taping Specifications
| Type | Tape Thickness (mm) | Tape Material | Quantity per Reel |
|---|---|---|---|
| 0201 | 0.5 0.15 | Paper Tape | 15K |
| X | 0.5 0.15 | Paper Tape | 10K |
| A | 0.8 0.15 | Paper Tape | 4K |
| A | 0.85 0.2 | Paper Tape | 4K |
Storage Conditions
- Storage Temperature: -1040
- Relative Humidity: 75%RH
- Keep away from corrosive atmosphere and sunlight.
- Period of Storage: 6 Months
Notes & Warnings
- Do not operate or store under corrosive, deoxidized, volatile, inflammable, dusty, high/low pressure, humid conditions, or in places with brine, oil, chemical liquid, organic solvent, or intense vibration.
- The ceramic body is fragile; avoid excessive pressure or impact.
- Do not operate beyond the specified operating temperature range.
Recommended Soldering Technologies
Re-flowing Profile:
- Ramp: 1~2/sec.
- Pre-heating: 150~170/9030 sec.
- Time above 240: 20~40 sec.
- Peak temperature: 260 Max./10 sec.
- Solder paste: Sn/3.0Ag/0.5Cu
- Max. 2 times for re-flowing
Iron Soldering Profile:
- Iron soldering power: Max. 20W
- Pre-heating: 150/60sec.
- Soldering Tip temperature: 280 Max.
- Soldering time: 3 sec Max.
- Solder paste: Sn/3.0Ag/0.5Cu
- Max. 1 time for iron soldering
[Note: Take care not to apply the tip of the soldering iron to the terminal electrodes.]
R-T Table (Partial Example)
| Temperature (C) | R_Min (Kohm) | R_Cent (Kohm) | R_Max (Kohm) | Res TOL. | Temp TOL.(C) |
|---|---|---|---|---|---|
| -40 | 1,649.637 | 1,726.374 | 1,806.500 | 4.64% | 0.67 |
| -39 | 1,543.253 | 1,613.954 | 1,687.726 | 4.57% | 0.66 |
| ... | ... | ... | ... | ... | ... |
| 25 | 49.500 | 50.000 | 50.500 | 1.00% | 0.23 |
| ... | ... | ... | ... | ... | ... |
| 125 | 1.631 | 1.705 | 1.781 | 4.47% | 1.77 |
2410121534_Nanjing-Shiheng-Elec-CMFA-503F3950_C2889050.pdf
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