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SMCJ170A-TP Equivalent & Substitute Parts
Part Overview
The SMCJ170A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with a 170V reverse standoff voltage and provides 275V maximum clamping voltage at peak pulse current of 5.5A. The part is actively produced and RoHS3 compliant, with unlimited moisture sensitivity rating (MSL 1).
Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AB (SMC) package family. Substitutes are categorized as direct equivalents or similar alternatives based on parameter alignment.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 170 | V |
| Voltage - Breakdown (Min) | 189 | V |
| Voltage - Clamping (Max) @ Ipp | 275 | V |
| Current - Peak Pulse (10/1000µs) | 5.5 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 175 | °C |
| Package / Case | DO-214AB, SMC | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitute parts are classified into two categories based on electrical parameter alignment:
Direct Equivalents match all critical electrical parameters: 170V reverse standoff voltage, 189V minimum breakdown voltage, 275V maximum clamping voltage, and 5.5A peak pulse current. These parts are pin-compatible and functionally interchangeable in the same circuit application.
Similar Alternatives maintain the same voltage ratings (170V standoff, 189V breakdown, 275V clamping) but differ in peak pulse current capacity or power dissipation. These parts provide enhanced performance margins and are suitable for applications requiring higher transient energy absorption.
The substitution logic is based on the following key parameters:
- Voltage - Reverse Standoff (Typ): 170V
- Voltage - Breakdown (Min): 189V
- Voltage - Clamping (Max) @ Ipp: 275V
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temperature (°C) | Packaging | Classification |
|---|---|---|---|---|---|---|---|---|---|
| SMCJ170A-TP | Micro Commercial Co | 170 | 189 | 275 | 5.5 | 1500 | -55 to 175 | Tape & Reel | Main Part |
| SMCJ170A | Fairchild Semiconductor | 170 | 189 | 275 | 5.5 | 1500 | -55 to 150 | Bulk | Direct Equivalent |
| SMCJ170A-13-F | Diodes Incorporated | 170 | 189 | 275 | 5.5 | 1500 | -55 to 150 | Tape & Reel | Direct Equivalent |
| SMCJ170A-E3/57T | Vishay General Semiconductor - Diodes Division | 170 | 189 | 275 | 5.5 | 1500 | -55 to 150 | Tape & Reel | Direct Equivalent |
| 5.0SMDJ170A | MDE Semiconductor Inc | 170 | 189 | 275 | 18.2 | 5000 | -55 to 150 | Tape & Reel | Similar Alternative |
| 5.0SMDJ170A-T7 | Littelfuse | 170 | 189 | 275 | 18.2 | 5000 | -65 to 150 | Tape & Reel | Similar Alternative |
| SMCJ170A-TR | STMicroelectronics | 170 | 189 | 353 | 28 | 1500 | -55 to 150 | Tape & Reel | Similar Alternative |
| SMDJ170A | Alpha & Omega Semiconductor Inc. | 170 | 189 | 275 | 11 | 3000 | -55 to 150 | Tape & Reel | Similar Alternative |
| SMLJ170A | Bourns Inc. | 170 | 189 | 275 | 11 | 3000 | -55 to 150 | Tape & Reel | Similar Alternative |
Engineering Selection Recommendations
Direct Equivalents (SMCJ170A, SMCJ170A-13-F, SMCJ170A-E3/57T) are recommended for one-to-one replacement in existing designs. All three parts maintain identical electrical specifications with the main part and are RoHS3 compliant. The primary difference is packaging format: Fairchild supplies in bulk, while Diodes Incorporated and Vishay provide tape & reel packaging. Operating temperature range is reduced to -55°C to 150°C compared to the main part's -55°C to 175°C specification.
Similar Alternatives provide enhanced performance characteristics suitable for applications requiring higher transient energy absorption or extended temperature operation. The 5.0SMDJ series (MDE Semiconductor and Littelfuse) offers 18.2A peak pulse current and 5000W power dissipation, with Littelfuse extending the lower temperature limit to -65°C. The SMCJ170A-TR from STMicroelectronics provides 28A peak pulse current but increases clamping voltage to 353V. The SMDJ170A and SMLJ170A offer intermediate performance with 11A peak pulse current and 3000W power dissipation.
All substitute parts are RoHS3 compliant and maintain MSL 1 (unlimited) moisture sensitivity rating. Selection should be based on circuit requirements for peak pulse current capacity, power dissipation margin, and operating temperature range.
Frequently Asked Questions (FAQ)
Q: Can SMCJ170A-TP be directly replaced with SMCJ170A?
A: Yes. Both parts share identical electrical specifications (170V standoff, 189V breakdown, 275V clamping, 5.5A peak pulse current). The primary difference is packaging: SMCJ170A-TP is supplied in tape & reel format, while SMCJ170A is supplied in bulk. Operating temperature range differs slightly (-55°C to 150°C for SMCJ170A versus -55°C to 175°C for SMCJ170A-TP).
Q: What is the difference between direct equivalents and similar alternatives?
A: Direct equivalents (SMCJ170A, SMCJ170A-13-F, SMCJ170A-E3/57T) maintain all electrical parameters of the main part, including 5.5A peak pulse current and 1500W power dissipation. Similar alternatives provide higher peak pulse current (11A to 28A) or power dissipation (3000W to 5000W), offering enhanced transient protection margins but at different clamping voltages in some cases.
Q: Are all substitute parts compatible with the DO-214AB package?
A: Yes. All listed substitute parts use the DO-214AB (SMC) surface-mount package and are mechanically compatible with the same PCB footprint and reflow soldering process.
Q: Which substitute part should be used for applications requiring extended temperature operation?
A: The 5.0SMDJ170A-T7 from Littelfuse extends the lower operating temperature to -65°C (compared to -55°C for most alternatives). This part maintains 170V standoff and 275V clamping voltages while providing 18.2A peak pulse current and 5000W power dissipation.
Q: Do all substitute parts have the same RoHS and REACH compliance status?
A: All substitute parts listed are RoHS3 compliant. REACH status varies: most parts are REACH Unaffected, while SMLJ170A from Bourns is REACH Affected. Verify compliance requirements for your specific application before selection.
Q: What is the impact of selecting a higher current-rated alternative like SMDJ170A or SMLJ170A?
A: These parts provide 11A peak pulse current and 3000W power dissipation compared to the main part's 5.5A and 1500W. They maintain identical voltage ratings (170V standoff, 189V breakdown, 275V clamping) and are suitable for applications requiring greater transient energy absorption without changing the protection voltage threshold.
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