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3KASMC16HE3_A/I Equivalent & Substitute Parts
Part Overview
The 3KASMC16HE3_A/I 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 device carries automotive-grade qualification (AEC-Q101) and is ROHS3 compliant.
The 3KASMC16HE3_A/I is currently listed as obsolete. Equivalent and substitute parts are available from multiple manufacturers, offering comparable electrical performance with varying specifications in peak pulse current, clamping voltage, and power dissipation ratings.
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 | — |
| Grade | Automotive | — |
| Qualification | AEC-Q101 | — |
| RoHS Status | ROHS3 Compliant | — |
Substitute Part Grouping Explanation
Substitution of the 3KASMC16HE3_A/I is determined by the following critical electrical and mechanical parameters:
Voltage Parameters: All substitute parts must maintain the same 16V reverse standoff voltage and 17.8V minimum breakdown voltage to ensure proper circuit protection thresholds.
Clamping Voltage: Substitute parts with clamping voltages between 26V and 28.8V are functionally equivalent, as this range represents acceptable variation within TVS diode specifications for this voltage class.
Peak Pulse Current & Power Dissipation: Substitute parts with peak pulse current ratings of 57.7A or higher and power dissipation of 1500W or greater are acceptable, as these ratings meet or exceed the original specification of 104A and 3000W.
Package Compatibility: All substitutes must use the DO-214AB (SMC) or compatible surface mount package to maintain PCB layout compatibility.
Temperature Range: Operating temperature ranges of -55°C to 175°C or wider are acceptable for general applications; automotive-grade parts with -65°C to 185°C range provide extended margin.
Compliance: ROHS3 compliance and automotive qualification (AEC-Q101) are preferred for automotive applications but not mandatory for general-purpose substitution.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (Max) @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Package | Product Status |
|---|---|---|---|---|---|---|---|---|
| 3KASMC16HE3_A/I | Vishay | 16 | 28.8 | 104 | 3000 | -65 to 185 | DO-214AB (SMC) | Obsolete |
| 3KASMC16AHE3_B/I | Vishay | 16 | 26 | 115 | 3000 | -65 to 185 | DO-214AB (SMC) | Active |
| 5.0SMDJ16A | Taiwan Semiconductor Corporation | 16 | 26 | 193 | 5000 | -55 to 175 | DO-214AB (SMC) | Active |
| SMCJ16A-HRA | Littelfuse Inc. | 16 | 26 | 57.7 | 1500 | -65 to 150 | DO-214AB (SMC) | Active |
| SMCJ16A-HRAT7 | Littelfuse Inc. | 16 | 26 | 57.7 | 1500 | -65 to 150 | DO-214AB (SMC) | Active |
| SMCJ16A-TP | Micro Commercial Co | 16 | 26 | 57.7 | 1500 | -55 to 175 | DO-214AB (SMC) | Active |
| SMDJ16A | Alpha & Omega Semiconductor Inc. | 16 | 26 | 115.4 | 3000 | -55 to 150 | DO-214AB (SMC) | Active |
| SMDJ16A-HR | Littelfuse Inc. | 16 | 26 | 115.4 | 3000 | -65 to 150 | DO-214AB (SMC) | Active |
Engineering Selection Recommendations
Direct Replacement (Preferred): The 3KASMC16AHE3_B/I from Vishay is the primary equivalent, maintaining identical voltage specifications, power rating, and automotive-grade qualification while offering improved peak pulse current (115A vs. 104A). This part is active and available in production quantities.
High Current Applications: The 5.0SMDJ16A and SMDJ16A provide enhanced peak pulse current ratings (193A and 115.4A respectively) with equivalent or superior power dissipation (5000W and 3000W). These are suitable for applications requiring higher transient energy absorption.
Compact Power Budget: The SMCJ16A-HRA, SMCJ16A-HRAT7, and SMCJ16A-TP offer reduced power dissipation (1500W) with lower peak pulse current (57.7A), appropriate for applications with lower transient energy requirements or thermal constraints.
Automotive Applications: Parts with AEC-Q101 qualification (3KASMC16AHE3_B/I, SMCJ16A-HRA, SMCJ16A-HRAT7, SMDJ16A-HR) are recommended for automotive-grade designs. All listed substitutes maintain ROHS3 compliance.
Temperature Margin: For applications requiring the full -65°C to 185°C range, select 3KASMC16AHE3_B/I or SMCJ16A-HRA/HRAT7. For standard industrial range (-55°C to 175°C), 5.0SMDJ16A and SMCJ16A-TP are suitable.
Frequently Asked Questions (FAQ)
Q: Can I use SMCJ16A-TP as a direct replacement for 3KASMC16HE3_A/I?
A: Yes. Both parts share identical reverse standoff voltage (16V), clamping voltage (26V vs. 28.8V is within acceptable range), and DO-214AB package. The SMCJ16A-TP provides 1500W peak pulse power versus the original 3000W, so it is suitable only for applications where transient energy does not exceed 1500W.
Q: What is the difference between SMCJ16A-HRA and SMCJ16A-HRAT7?
A: Both parts are electrically identical with 16V standoff, 26V clamping, 57.7A peak pulse current, and 1500W power rating in DO-214AB package. The HRAT7 designation indicates a specific tape and reel configuration. Selection depends on packaging and supply chain requirements.
Q: Is the 5.0SMDJ16A compatible with my PCB designed for 3KASMC16HE3_A/I?
A: Yes. The 5.0SMDJ16A uses the same DO-214AB (SMC) package and footprint. It provides superior performance with 193A peak pulse current and 5000W power dissipation, making it a direct mechanical and electrical upgrade.
Q: Why does the 3KASMC16AHE3_B/I have lower clamping voltage (26V) than the original (28.8V)?
A: The 26V clamping voltage is within the acceptable specification range for 16V standoff TVS diodes and represents a manufacturing variation. Both values provide equivalent circuit protection. The 3KASMC16AHE3_B/I compensates with higher peak pulse current (115A vs. 104A).
Q: Can I use SMCJ16A parts in automotive applications?
A: SMCJ16A-HRA and SMCJ16A-HRAT7 from Littelfuse carry automotive-grade qualification. SMCJ16A-TP from Micro Commercial Co is rated for general-purpose applications. For automotive designs, select parts with AEC-Q101 qualification.
Q: What is the minimum peak pulse current I need for substitution?
A: The original 3KASMC16HE3_A/I specifies 104A. Substitutes with 57.7A or higher are acceptable, though lower ratings reduce transient energy absorption capacity. For equivalent performance, select parts with 100A or higher.
Q: Are all listed substitutes ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.
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