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Vishay General Semiconductor - Diodes Division 3KASMC28AHE3_A/H
- Part No.:
- 3KASMC28AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHE3_A/H.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,956
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Product details
Overview
3KASMC28AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 µs), 31.1–34.4 V breakdown voltage (VBR), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC28AHE3_A/H datasheet, 3KASMC28AHE3_A/H pinout, 3KASMC28AHE3_A/H application, or 3KASMC28AHE3_A/H equivalent, key selection criteria include clamping voltage (45.4 V at IPPM), unidirectional polarity, AEC-Q101 qualification, and thermal resistance (RθJA = 77.5 °C/W) under high-reliability board-level surge conditions.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology to deliver stable clamping performance across -65 °C to +185 °C operating range, with low incremental surge resistance and fast response time critical for suppressing transients from inductive load switching. It meets MSL Level 1 per J-STD-020 and passes JESD201 Class 2 whisker testing.
The device operates exclusively in unidirectional mode, features a color-band cathode marking, and is optimized for PCB mounting on minimum recommended pad layout per Vishay's DO-214AB mechanical drawing - enabling robust thermal dissipation (RθJL = 18.3 °C/W) without heatsinking under transient stress.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 31.1 V / 34.4 V at 1.0 mA test current - defines precise reverse breakdown threshold for reliable triggering during overvoltage events |
| VWM | 28 V - maximum continuous reverse stand-off voltage before leakage exceeds 1.0 µA, ensuring no false triggering in normal operation |
| VC @ IPPM | 45.4 V at 66.1 A peak pulse current - clamping voltage limits downstream IC/sensor voltage stress during 3000 W transient surges |
| PPPM | 3000 W (10/1000 µs waveform) - enables protection against severe automotive load-dump and ISO 7637-2 pulse 5a/b transients |
| TJ max. | +185 °C - supports under-hood automotive applications and high-temperature industrial environments without derating |
| AEC-Q101 | Qualified - validated for automotive electronic systems requiring zero-failure reliability over extended temperature and lifetime cycles |
| RθJA | 77.5 °C/W - determines junction-to-ambient thermal rise under steady-state power dissipation (6.0 W), guiding PCB copper area design |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0 flammability rating and RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or lower-potential rail; conducts surge current to ground during reverse-biased clamping |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., sensor supply or MOSFET gate); initiates avalanche breakdown when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier structure ensures stable VBR and low leakage (<1.0 µA at VWM) over 15+ year automotive life |
| High-temperature capability | Rated for continuous operation up to +185 °C junction temperature - eliminates thermal derating in engine-control units and ADAS modules |
| Peak pulse power | 3000 W (10/1000 µs) supports compliance with ISO 7637-2 Pulse 5a (load dump) and IEC 61000-4-5 surge immunity requirements |
| Clamping efficiency | Clamping ratio VC/VBR ≈ 1.35 - minimizes overvoltage overshoot while maintaining margin below IC absolute maximum ratings |
| Manufacturing reliability | MSL Level 1 (260 °C reflow peak), JESD201 Class 2 whisker resistance, and AEC-Q101 qualification ensure zero infant mortality in production SMT lines |
Applications
| Automotive Power Distribution | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V power rails in body control modules against load-dump transients (ISO 7637-2 Pulse 5a). IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and DC-DC converter input to clamp surges before they reach regulation circuitry. Use Value: Limits transient voltage to ≤45.4 V, preventing damage to 40 V-rated input MOSFETs and enabling use of cost-optimized downstream components. |
Use Scenario: Safeguarding analog output lines of pressure/temperature sensors in factory automation PLCs exposed to relay coil flyback. IC Role / Device Role / Timing Role: TVS connected between sensor signal line and ground to absorb inductive kickback energy from nearby solenoid drivers. Use Value: Fast response time and low clamping voltage preserve signal integrity and prevent ADC saturation or microcontroller reset during EMI events. |
| Automotive ADAS Camera Module | Telecom Power Supply Input |
|
Use Scenario: Shielding MIPI CSI-2 power supply pins in rear-view camera modules from ignition noise and alternator ripple. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to suppress coupled transients before reaching image sensor and serializer ICs. Use Value: AEC-Q101 qualification and 185 °C rating ensure uninterrupted operation in sealed, thermally constrained camera housings. |
Use Scenario: Front-end protection of 48 V telecom rectifier inputs subjected to lightning-induced surges per IEC 61000-4-5 Level 4. IC Role / Device Role / Timing Role: Primary clamping device in series with fuse and MOV, absorbing initial 3000 W surge energy before secondary protection engages. Use Value: High PPPM and low Rsurge enable single-device handling of 6 kV/3 kA surges without coordination complexity or voltage overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A | Lower PPPM (400 W), same DO-214AC (SMA) package, VBR = 31.1–34.4 V, but not AEC-Q101 qualified | Suitable for commercial-grade consumer electronics; insufficient for automotive load-dump immunity | Select only for cost-sensitive non-automotive designs where 3000 W surge capacity is unnecessary |
| SMCJ28A | Same DO-214AB (SMC) package and 3000 W rating, but VBR = 31.1–34.4 V and AEC-Q101 qualified - identical electrical specs but different base P/N suffixing and tape/reel packaging | Direct functional match; differs only in ordering code (HM3 vs. standard SMCJ) and traceability documentation | Prefer 3KASMC28AHE3_A/H when full Vishay PAR® family traceability, HM3 whisker-tested leads, and AEC-Q101 certificate versioning are required |
Compared with SMAJ28A and SMCJ28A, the 3KASMC28AHE3_A/H delivers identical clamping performance and automotive qualification but adds enhanced process control via HM3 suffix (JESD201 Class 2 whisker test) and explicit PAR® branding for high-reliability program traceability.
Availability
3KASMC28AHE3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, ADAS camera modules, and telecom power supply input applications requiring stable component supply, AEC-Q101 compliance, and high-temperature operational continuity.
Supply support for 3KASMC28AHE3_A/H includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in high-reliability diodes, MOSFETs, and optoelectronics for automotive, industrial, and computing markets.
The 3KASMCxxA series belongs to Vishay's PAR® (Protected Automotive Rectifier) family, engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive environments - emphasizing thermal stability, surge robustness, and long-term parametric consistency.
FAQ
What is the exact breakdown voltage range for 3KASMC28AHE3_A/H?
The 3KASMC28AHE3_A/H has a guaranteed breakdown voltage (VBR) range of 31.1 V to 34.4 V at 1.0 mA test current, as specified in Vishay's Document Number 89962. This range ensures consistent avalanche initiation across production lots and temperature extremes, critical for predictable clamping behavior in safety-critical automotive circuits.
Is 3KASMC28AHE3_A/H suitable for bidirectional transient protection?
No, the 3KASMC28AHE3_A/H is unidirectional only - it protects against positive transients on the cathode side relative to anode (ground). For bidirectional protection, two devices in series-opposing configuration or a dedicated bidirectional TVS like SMBJ28CA would be required. The datasheet explicitly states "Available in uni-directional polarity only" for the entire 3KASMCxxA family.
Does 3KASMC28AHE3_A/H meet automotive qualification standards?
Yes, the 3KASMC28AHE3_A/H is AEC-Q101 qualified, as confirmed in the Vishay datasheet (Document Number 89962, page 1). This qualification covers stress tests including HTGB, HTRB, TST, and temperature cycling - validating its suitability for under-hood and chassis-mounted automotive electronics with 15+ year field life expectations.
What is the maximum clamping voltage of 3KASMC28AHE3_A/H under surge conditions?
The maximum clamping voltage (VC) of the 3KASMC28AHE3_A/H is 45.4 V at 66.1 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - essential for verifying margin below downstream IC absolute maximum ratings.
What package type and mounting specifications apply to 3KASMC28AHE3_A/H?
The 3KASMC28AHE3_A/H uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Its mechanical outline matches Vishay's standard SMC footprint, requires minimum pad layout per datasheet Figure 4, and is rated MSL Level 1 with 260 °C peak reflow tolerance - supporting automated assembly in high-volume automotive production lines.
3KASMC28AHE3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- PAR®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 66.1A
- Power - Peak Pulse:
- 3000W (3kW)
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 185°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMCJ)
3KASMC28AHE3_A/H FAQ
1.How can I place an order for 3KASMC28AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHE3_A/H on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 3KASMC28AHE3_A/H reliable?
The price and inventory of 3KASMC28AHE3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHE3_A/H?
3KASMC28AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHE3_A/H order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 3KASMC28AHE3_A/H?
For technical support, including 3KASMC28AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC28AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHE3_A/H products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 3KASMC28AHE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHE3_A/H?
All 3KASMC28AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHE3_A/H, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 3KASMC28AHE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC28AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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