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3KASMC16HE3/9AT Equivalent & Substitute Parts
Part Overview
The 3KASMC16HE3/9AT is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for surface mount applications in the DO-214AB (SMC) package. This component operates with a 16V reverse standoff voltage and provides 28.8V clamping at peak pulse current, delivering 3000W peak pulse power dissipation across an operating temperature range of -65°C to 185°C. The part carries AEC-Q101 automotive qualification and ROHS3 compliance.
The 3KASMC16HE3/9AT is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications requiring 16V TVS diode functionality.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 16 | V |
| Voltage - Breakdown (Min) | 17.8 | V |
| Voltage - Clamping (Max) @ Ipp | 28.8 | V |
| Current - Peak Pulse (10/1000µs) | 104 | A |
| Power - Peak Pulse | 3000 | W |
| Operating Temperature Range | -65 to 185 | °C |
| Package / Case | DO-214AB, SMC | |
| Type | Zener | |
| Unidirectional Channels | 1 | |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the 3KASMC16HE3/9AT is determined by the following critical parameters:
- Voltage - Reverse Standoff: 16V (all substitutes must match)
- Voltage - Breakdown (Min): 17.8V (all substitutes must match)
- Unidirectional Channels: 1 (all substitutes must match)
- Package / Case: DO-214AB, SMC (primary requirement for mechanical compatibility)
- Type: Zener (all substitutes must match)
Substitute parts are grouped into two categories based on clamping voltage and peak pulse current characteristics:
Category A - Higher Power Dissipation (5000W): 5.0SMDJ16A offers increased peak pulse power rating (5000W vs 3000W) with 26V clamping voltage. This part provides enhanced transient suppression capability.
Category B - Standard Power Dissipation (1500W-3000W): SMCJ16AE3/TR13, SMCJ16E3/TR13, SMDJ16A, SMDJ16A-HR, SMDJ16A-HRA, and SMDJ16A-HRAT7 maintain the core voltage specifications with varying peak pulse current ratings (52.1A to 115.4A) and power dissipation levels (1500W to 3000W). These parts are suitable for direct replacement in applications where the original 3000W specification is maintained or where lower power ratings are acceptable.
Category C - Lower Power Dissipation (600W): SMCJ16A (EVVO Semi) operates at 600W peak pulse power with 26V clamping and 57.7A peak pulse current. This part is suitable only for applications with reduced transient energy requirements.
All substitute parts maintain ROHS3 compliance and unidirectional operation with matching voltage specifications.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|---|
| 3KASMC16HE3/9AT | Vishay General Semiconductor | 16 | 17.8 | 28.8 | 104 | 3000 | -65 to 185 | DO-214AB, SMC | Obsolete |
| 5.0SMDJ16A | Taiwan Semiconductor Corporation | 16 | 17.8 | 26 | 193 | 5000 | -55 to 175 | DO-214AB, SMC | Active |
| SMCJ16AE3/TR13 | Microchip Technology | 16 | 17.8 | 26 | 57.7 | 1500 | -65 to 150 | DO-214AB, SMC | Active |
| SMCJ16E3/TR13 | Microchip Technology | 16 | 17.8 | 28.8 | 52.1 | 1500 | -65 to 150 | DO-214AB, SMC | Active |
| SMCJ16A | EVVO Semi | 16 | 17.8 | 26 | 57.7 | 600 | -65 to 150 | DO-214AC, SMA | Active |
| SMDJ16A | Alpha & Omega Semiconductor Inc. | 16 | 17.8 | 26 | 115.4 | 3000 | -55 to 150 | DO-214AB, SMC | Active |
| SMDJ16A-HR | Littelfuse Inc. | 16 | 17.8 | 26 | 115.4 | 3000 | -65 to 150 | DO-214AB, SMC | Active |
| SMDJ16A-HRA | Littelfuse Inc. | 16 | 17.8 | 26 | 115.4 | 3000 | -65 to 150 | DO-214AB, SMC | Active |
| SMDJ16A-HRAT7 | Littelfuse Inc. | 16 | 17.8 | 26 | 115.4 | 3000 | -65 to 150 | DO-214AB, SMC | Active |
Engineering Selection Recommendations
For Direct Replacement (Preferred):
SMDJ16A-HR, SMDJ16A-HRA, and SMDJ16A-HRAT7 (Littelfuse Inc.) are the primary recommended substitutes. These parts maintain identical power dissipation (3000W), matching peak pulse current (115.4A), and operate across the extended temperature range (-65°C to 150°C). All three variants are active products with ROHS3 compliance and DO-214AB SMC packaging. The extended low-temperature specification (-65°C) aligns with the original part's automotive-grade thermal requirements.
SMDJ16A (Alpha & Omega Semiconductor Inc.) provides equivalent 3000W power dissipation and 115.4A peak pulse current in DO-214AB SMC packaging with active product status and ROHS3 compliance. The operating temperature range is -55°C to 150°C, which may be acceptable depending on application requirements.
For Enhanced Transient Protection:
5.0SMDJ16A (Taiwan Semiconductor Corporation) offers increased peak pulse power rating (5000W) and higher peak pulse current (193A) while maintaining the 16V reverse standoff voltage and 17.8V breakdown minimum. This part is suitable for applications requiring enhanced transient suppression margin. Operating temperature range is -55°C to 175°C with active product status and ROHS3 compliance.
For Reduced Power Applications:
SMCJ16AE3/TR13 and SMCJ16E3/TR13 (Microchip Technology) provide 1500W peak pulse power dissipation with active product status, ROHS3 compliance, and DO-214AB SMC packaging. SMCJ16E3/TR13 maintains the original 28.8V clamping voltage specification. These parts are suitable for applications with lower transient energy requirements.
Package Compatibility Note:
SMCJ16A (EVVO Semi) uses DO-214AC SMA packaging, which differs from the original DO-214AB SMC package. This part is not recommended for direct mechanical replacement without PCB layout modification.
Frequently Asked Questions (FAQ)
Q: Can I use 5.0SMDJ16A as a direct replacement for 3KASMC16HE3/9AT?
A: 5.0SMDJ16A is electrically compatible with matching voltage specifications (16V reverse standoff, 17.8V breakdown minimum). The primary difference is increased peak pulse power rating (5000W vs 3000W) and higher peak pulse current (193A vs 104A). This part provides enhanced transient suppression capability and is suitable for direct replacement in DO-214AB SMC applications. Operating temperature range is -55°C to 175°C versus the original -65°C to 185°C.
Q: What is the difference between SMDJ16A-HR, SMDJ16A-HRA, and SMDJ16A-HRAT7?
A: All three Littelfuse variants maintain identical electrical specifications: 16V reverse standoff, 17.8V breakdown minimum, 26V clamping voltage, 115.4A peak pulse current, and 3000W power dissipation. The designations (-HR, -HRA, -HRAT7) represent different packaging or tape configurations. All three are active products with ROHS3 compliance and DO-214AB SMC packaging suitable for direct replacement.
Q: Why does SMCJ16A (EVVO Semi) show lower power dissipation (600W)?
A: SMCJ16A operates at 600W peak pulse power with 57.7A peak pulse current, which is lower than the original 3000W specification. This part is suitable only for applications with reduced transient energy requirements. Additionally, SMCJ16A uses DO-214AC SMA packaging rather than DO-214AB SMC, requiring PCB layout modification for mechanical compatibility.
Q: Are all substitute parts ROHS3 compliant?
A: All substitute parts listed are ROHS3 compliant, matching the original part's environmental compliance status.
Q: What is the impact of clamping voltage differences (26V vs 28.8V)?
A: The original 3KASMC16HE3/9AT clamps at 28.8V maximum. Most substitutes (5.0SMDJ16A, SMCJ16AE3/TR13, SMDJ16A variants, SMCJ16A) clamp at 26V. SMCJ16E3/TR13 maintains 28.8V clamping. Lower clamping voltage provides tighter transient suppression. Selection depends on circuit protection requirements and voltage tolerance specifications.
Q: Can I use SMCJ16E3/TR13 if I need to maintain 28.8V clamping voltage?
A: SMCJ16E3/TR13 (Microchip Technology) maintains the original 28.8V clamping voltage specification with 52.1A peak pulse current and 1500W power dissipation. This part is suitable for applications requiring the original clamping voltage specification. Operating temperature range is -65°C to 150°C with active product status and ROHS3 compliance.
Q: What are the temperature range implications for automotive applications?
A: The original part operates -65°C to 185°C. Most substitutes operate -65°C to 150°C or -55°C to 150°C. For automotive applications requiring the full -65°C to 185°C range, SMDJ16A-HR, SMDJ16A-HRA, and SMDJ16A-HRAT7 provide -65°C to 150°C operation, which covers the low-temperature extreme but not the high-temperature extreme. Application thermal requirements must be evaluated against substitute specifications.
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