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5KASMC24AHM3/57 Transient Voltage Suppressor Diode – Equivalent & Substitute Parts
Part Overview
The 5KASMC24AHM3/57 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor – Diodes Division. This surface mount component operates at a 24V reverse standoff voltage with a 38.9V maximum clamping voltage and 5000W peak pulse power rating. The device is packaged in DO-214AB (SMC) format and qualified to AEC-Q101 automotive standards.
The 5KASMC24AHM3/57 is classified as obsolete. Equivalent and substitute parts are available from active product lines that maintain the same electrical and mechanical specifications, ensuring design continuity and supply chain reliability.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage – Reverse Standoff (Typ) | 24 | V |
| Voltage – Breakdown (Min) | 26.7 | V |
| Voltage – Clamping (Max) @ Ipp | 38.9 | V |
| Power – Peak Pulse | 5000 | W |
| Type | Zener | – |
| Unidirectional Channels | 1 | – |
| Package / Case | DO-214AB, SMC | – |
| Mounting Type | Surface Mount | – |
| Operating Temperature | -65 to 185 | °C (TJ) |
| Grade | Automotive | – |
| Qualification | AEC-Q101 | – |
| RoHS Status | ROHS3 Compliant | – |
| MSL | 1 (Unlimited) | – |
Substitute Part Grouping Explanation
Substitution of the 5KASMC24AHM3/57 is determined by the following critical parameters:
- Voltage – Reverse Standoff (Typ): 24V
- Voltage – Breakdown (Min): 26.7V
- Voltage – Clamping (Max) @ Ipp: 38.9V
- Package / Case: DO-214AB, SMC
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional (1 channel)
- RoHS Status: ROHS3 Compliant
Substitute parts are grouped into two categories:
Category 1 – Direct Electrical & Package Equivalents: Parts maintaining identical voltage specifications (24V standoff, 26.7V breakdown, 38.9V clamping), DO-214AB SMC packaging, and surface mount configuration. These parts are fully interchangeable at the circuit level.
Category 2 – Functional Equivalents with Parameter Variations: Parts that maintain the 24V standoff and 26.7V breakdown voltages but differ in clamping voltage, peak pulse current, or power dissipation. These parts provide equivalent transient suppression function but with different performance characteristics.
Parameter Comparison
| Part Number | Manufacturer | Voltage – Reverse Standoff (V) | Voltage – Breakdown (V) | Voltage – Clamping (V) | Current – Peak Pulse (A) | Power – Peak Pulse (W) | Package | Product Status | Operating Temp (°C) |
|---|---|---|---|---|---|---|---|---|---|
| 5KASMC24AHM3/57 | Vishay | 24 | 26.7 | 38.9 | – | 5000 | DO-214AB, SMC | Obsolete | -65 to 185 |
| 5KASMC24AHM3_A/H | Vishay | 24 | 26.7 | 38.9 | – | 5000 | DO-214AB, SMC | Active | -65 to 185 |
| 3.0SMC24A | Littelfuse | 24 | 26.7 | 51 | 520 (8/20µs) | – | DO-214AB, SMC | Active | -65 to 150 |
| 5.0SMDJ24A-T7 | Littelfuse | 24 | 26.7 | 38.9 | 129 | 5000 | DO-214AB, SMC | Active | -65 to 150 |
| SMCJ24A | EVVO Semi | 24 | 26.7 | 38.9 | 38.6 | 600 | DO-214AC, SMA | Active | -65 to 150 |
| SMCJ24A-HR | Littelfuse | 24 | 26.7 | 38.9 | 38.6 | 1500 | DO-214AB, SMC | Active | -65 to 150 |
| SMCJ24A-HRA | Littelfuse | 24 | 26.7 | 38.9 | 38.6 | 1500 | DO-214AB, SMC | Active | -65 to 150 |
| SMCJ24A-HRAT7 | Littelfuse | 24 | 26.7 | 38.9 | 38.6 | 1500 | DO-214AB, SMC | Active | -65 to 150 |
| SMDJ24A | Alpha & Omega Semiconductor | 24 | 26.7 | 38.9 | 77.2 | 3000 | DO-214AB, SMC | Active | -55 to 150 |
Engineering Selection Recommendations
Primary Recommendation – Direct Equivalent:
The 5KASMC24AHM3_A/H (Vishay) is the direct successor to the obsolete 5KASMC24AHM3/57. It maintains identical electrical specifications (24V standoff, 26.7V breakdown, 38.9V clamping, 5000W peak pulse power), the same DO-214AB SMC package, and extends the operating temperature range to -65°C to 185°C. Product status is active with AEC-Q101 qualification and ROHS3 compliance. This part provides seamless design continuity with no circuit modifications required.
Secondary Recommendations – Active Alternatives:
The 5.0SMDJ24A-T7 (Littelfuse) and SMDJ24A (Alpha & Omega Semiconductor) maintain the critical voltage specifications (24V standoff, 26.7V breakdown, 38.9V clamping) and DO-214AB SMC packaging. Both are active products with ROHS3 compliance. The 5.0SMDJ24A-T7 matches the 5000W peak pulse power rating; the SMDJ24A provides 3000W peak pulse power. Operating temperature is -65°C to 150°C for both.
The SMCJ24A-HR, SMCJ24A-HRA, and SMCJ24A-HRAT7 (Littelfuse) are active alternatives with identical voltage specifications and DO-214AB SMC packaging. These parts provide 1500W peak pulse power and -65°C to 150°C operating temperature range. All three variants are qualified to ROHS3 and suitable for general purpose applications.
The 3.0SMC24A (Littelfuse) maintains the 24V standoff and 26.7V breakdown voltages but specifies a higher 51V clamping voltage. This part is suitable only if circuit design accommodates the elevated clamping voltage.
The SMCJ24A (EVVO Semi) uses DO-214AC SMA packaging instead of DO-214AB SMC. This package difference requires PCB layout modification and is not a direct mechanical substitute.
Frequently Asked Questions (FAQ)
Q: Can the 5KASMC24AHM3_A/H directly replace the 5KASMC24AHM3/57 without circuit modifications?
A: Yes. The 5KASMC24AHM3_A/H is electrically and mechanically identical to the obsolete part. It maintains the same 24V standoff voltage, 26.7V breakdown voltage, 38.9V clamping voltage, 5000W peak pulse power, and DO-214AB SMC package. No design changes are required.
Q: What is the difference between the 5.0SMDJ24A-T7 and SMDJ24A substitutes?
A: Both parts maintain identical voltage specifications (24V standoff, 26.7V breakdown, 38.9V clamping) and DO-214AB SMC packaging. The 5.0SMDJ24A-T7 provides 5000W peak pulse power matching the original part; the SMDJ24A provides 3000W peak pulse power. Selection depends on circuit transient energy requirements.
Q: Why does the 3.0SMC24A have a different clamping voltage (51V vs. 38.9V)?
A: The 3.0SMC24A is a functional equivalent that maintains the same 24V standoff and 26.7V breakdown voltages but clamps transients at a higher 51V level. This part is suitable only if the protected circuit can tolerate the higher clamping voltage without damage.
Q: Can SMCJ24A (EVVO Semi) be used as a direct substitute?
A: The SMCJ24A maintains identical voltage specifications but uses DO-214AC SMA packaging instead of DO-214AB SMC. This package difference requires PCB footprint modification. Electrical performance is equivalent; mechanical compatibility requires design review.
Q: What is the significance of the -HR and -HRA designations on Littelfuse parts?
A: The -HR and -HRA designations indicate high-reliability variants from Littelfuse. Both maintain the same electrical specifications (24V standoff, 26.7V breakdown, 38.9V clamping) and DO-214AB SMC packaging as the base SMCJ24A. The -HRAT7 variant includes tape and reel packaging. All three are functionally equivalent.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the environmental qualification of the original 5KASMC24AHM3/57.
Q: What is the operating temperature difference between the original part and substitutes?
A: The original 5KASMC24AHM3/57 operates from -65°C to 185°C. Most active substitutes operate from -65°C to 150°C. The 5KASMC24AHM3_A/H maintains the full -65°C to 185°C range. Circuit thermal requirements determine whether the reduced upper temperature limit of alternative parts is acceptable.
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