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Vishay General Semiconductor - Diodes Division 3KASMC28AHM3_A/I
- Part No.:
- 3KASMC28AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC28AHM3_A/I.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,395
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Product details
Overview
3KASMC28AHM3_A/I 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), 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown voltage (VBR), and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of MOSFETs, sensor signal lines, and IC power rails.
For engineers reviewing the 3KASMC28AHM3_A/I datasheet, 3KASMC28AHM3_A/I pinout, 3KASMC28AHM3_A/I application, or 3KASMC28AHM3_A/I equivalent, key selection criteria include clamping voltage (45.4 V at IPPM), AEC-Q101 qualification, MSL Level 1 rating, uni-directional polarity, and thermal resistance (RθJA = 77.5 °C/W) under PCB-mounted 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 enabling effective suppression of inductive switching transients and lightning-induced surges. Its 10/1000 μs waveform capability supports high-energy transient immunity in harsh environments.
The device operates exclusively in uni-directional mode, with cathode denoted by color band, and is optimized for mounting on minimum recommended pad layout per JEDEC standards. It meets JESD201 Class 2 whisker test requirements and achieves UL 94 V-0 flammability rating in its molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 28 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 24 V automotive systems. |
| VBR (min/max) | 31.1 V / 34.4 V at 1 mA - Confirmed breakdown threshold ensures reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 45.4 V - Clamping voltage at peak pulse current; limits downstream voltage stress during 3000 W transient events. |
| PPPM | 3000 W - Peak pulse power handling (10/1000 μs) enables robust protection against ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 surges. |
| TJ max | +185 °C - Enables operation in under-hood automotive environments and high-temperature industrial control units. |
| AEC-Q101 | Qualified - Validated for automotive electronics per stress-test standard, including HTGB, HTRB, and TCT. |
| Package | DO-214AB (SMC) - Surface-mount outline with 0.305" x 0.220" footprint; compatible with automated reflow assembly and IPC-7351B land patterns. |
Pinout & Package
DO-214AB (SMC) package with two terminals: cathode marked by color band; anode and cathode leads are matte tin plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; connected to protected circuit ground or low-side reference | Completes conduction path during reverse-transient clamping; must be routed with low-inductance trace to minimize voltage overshoot. |
| Cathode | Current exit terminal in forward bias; marked by color band; connected to protected line (e.g., 24 V rail or signal) | Defines polarity-sensitive connection point; misorientation prevents clamping and risks catastrophic failure under surge. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable leakage (<1 μA at VWM) and long-term reliability under thermal cycling. |
| High-temperature operation | Rated for TJ up to +185 °C - eliminates derating concerns in engine-control modules and powertrain ECUs. |
| Peak pulse power | 3000 W (10/1000 μs) - exceeds ISO 16750-2 Level IV surge requirements for 12/24 V vehicle systems. |
| Clamping efficiency | VC/VBR ratio = 1.31 - low clamping overhead preserves margin for downstream 3.3 V or 5 V logic interfaces. |
| Manufacturing compliance | RoHS-compliant, MSL Level 1 (260 °C peak), JESD201 Class 2 whisker tested - ensures compatibility with lead-free SMT processes. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppressing load-dump transients (ISO 16750-2 Pulse 5a) on 24 V battery-fed ECUs in commercial vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between power rail and chassis ground to shunt surge energy away from DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤45.4 V during 3000 W pulses, preventing latch-up or gate oxide damage in downstream 40 V-rated FETs and LDOs. |
Use Scenario: Protecting analog outputs of pressure/temperature sensors in factory automation PLC I/O modules exposed to relay coil flyback. IC Role / Device Role / Timing Role: Low-capacitance TVS placed at sensor connector interface to clamp sub-100 ns transients before reaching ADC front-end. Use Value: Maintains signal integrity with <1 μA leakage at 28 V, while clamping 1 kV/μs spikes to safe levels for 12-bit precision measurement circuits. |
| Telecom DC Power Input Protection | Computer Peripheral USB VBUS Protection |
Use Scenario: Safeguarding PoE-powered network switches against induced surges from nearby AC mains cabling or lightning coupling. IC Role / Device Role / Timing Role: Primary-level TVS on 48 V input stage, coordinated with upstream MOV and downstream DC-DC converter OVP. Use Value: Withstands repeated 3000 W surges without parameter shift, supporting >10-year field life in outdoor telecom cabinets. |
Use Scenario: Preventing ESD and cable discharge events from damaging USB 2.0 host controller VBUS pins during hot-plug insertion. IC Role / Device Role / Timing Role: Uni-directional TVS placed between VBUS and GND, sized to handle ±15 kV contact discharge per IEC 61000-4-2. Use Value: Achieves <100 ps response time and 45.4 V clamping, ensuring VBUS stays below 5.5 V tolerance limit of USB PHY transceivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-E3/57T (Vishay) | Same DO-214AC (SMA) package; lower PPPM (400 W); higher RθJA (110 °C/W); identical VWM/VBR range | Limited to lower-energy transients (e.g., IEC 61000-4-2 ESD only); unsuitable for ISO 7637-2 Pulse 5a | Select when space-constrained layouts require smaller SMA footprint and surge energy is <500 W. |
| 1.5KE28A (ON Semiconductor) | Through-hole DO-201AE package; same 3000 W rating; higher VF (3.5 V); no AEC-Q101 qualification | Not qualified for automotive use; requires wave-solder or hand-solder process; less suitable for high-reliability embedded systems | Choose for cost-sensitive industrial power supplies where AEC-Q101 is not mandated and board real estate allows axial leads. |
Compared with SMAJ28A-E3/57T and 1.5KE28A, the 3KASMC28AHM3_A/I uniquely combines AEC-Q101 qualification, DO-214AB surface-mount scalability, and full 3000 W automotive surge capability - making it the preferred choice for production-grade automotive and industrial designs requiring zero-layout change across temperature and lifetime.
Availability
3KASMC28AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, telecom power inputs, and computer peripheral protection requiring stable component supply with guaranteed long-term manufacturability.
Supply support for 3KASMC28AHM3_A/I 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 diodes, rectifiers, MOSFETs, and protection devices with emphasis on reliability, high-temperature operation, and automotive qualification.
The 3KASMC series was engineered specifically for AEC-Q101-compliant transient suppression in demanding automotive and industrial environments - delivering high-power clamping in compact SMC packages with extended thermal endurance.
FAQ
What is the clamping voltage of the 3KASMC28AHM3_A/I under maximum surge conditions?
The 3KASMC28AHM3_A/I exhibits a maximum clamping voltage (VC) of 45.4 V when subjected to its rated peak pulse current (IPPM) under 10/1000 μs waveform conditions. This value is measured at the device's specified test current and reflects actual voltage limiting behavior during transient events - critical for ensuring downstream components remain within their absolute maximum ratings. The 3KASMC28AHM3_A/I maintains this clamping performance across its full operating temperature range.
Is the 3KASMC28AHM3_A/I qualified for automotive applications?
Yes, the 3KASMC28AHM3_A/I is AEC-Q101 qualified, having passed stress tests including high-temperature reverse bias (HTRB), high-temperature gate bias (HTGB), and temperature cycling (TCT). This qualification confirms its suitability for automotive powertrain, body control, and ADAS modules where reliability under thermal and electrical stress is mandatory. The 3KASMC28AHM3_A/I also supports MSL Level 1 handling and lead-free reflow compatibility required for modern automotive manufacturing.
What package type does the 3KASMC28AHM3_A/I use, and what are its key mechanical features?
The 3KASMC28AHM3_A/I uses the DO-214AB (SMC) surface-mount package, measuring 0.305" × 0.220" (7.75 mm × 5.59 mm) with 0.060" lead spacing. Its molding compound meets UL 94 V-0 flammability rating, and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards. The cathode is marked by a visible color band, and the device passes JESD201 Class 2 whisker testing - all verified per Vishay document 89962 for the 3KASMC28AHM3_A/I.
How does the 3KASMC28AHM3_A/I compare to other TVS diodes in the 3KASMC family?
The 3KASMC28AHM3_A/I belongs to the 3KASMC10A–3KASMC43A family and shares core characteristics including 3000 W peak pulse power, DO-214AB packaging, AEC-Q101 qualification, and 185 °C junction rating. Its distinguishing feature is the 28 V stand-off voltage (VWM) and corresponding 31.1–34.4 V breakdown range - optimized for 24 V nominal systems. Other variants differ only in VWM/VBR values and marking codes; all share identical thermal, mechanical, and reliability specifications.
What is the maximum leakage current specification for the 3KASMC28AHM3_A/I at its rated stand-off voltage?
The 3KASMC28AHM3_A/I specifies a maximum reverse leakage current (IR) of 1.0 μA at its 28 V stand-off voltage (VWM) and 25 °C ambient temperature. At elevated temperature (TJ = 150 °C), leakage remains ≤10 μA - confirming stable blocking behavior across automotive operating ranges. This low leakage ensures minimal power loss in always-on circuits and avoids false triggering in high-impedance sensor interfaces, directly validated in Vishay's Electrical Characteristics table for the 3KASMC28AHM3_A/I.
3KASMC28AHM3_A/I 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)
3KASMC28AHM3_A/I FAQ
1.How can I place an order for 3KASMC28AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC28AHM3_A/I 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 3KASMC28AHM3_A/I reliable?
The price and inventory of 3KASMC28AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC28AHM3_A/I is usually 5 days.
3.What payment methods are accepted for 3KASMC28AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC28AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC28AHM3_A/I?
3KASMC28AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC28AHM3_A/I 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 3KASMC28AHM3_A/I?
For technical support, including 3KASMC28AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC28AHM3_A/I requirements.
6.How does Aetrix verify that 3KASMC28AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All 3KASMC28AHM3_A/I 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 3KASMC28AHM3_A/I meets industry standards.
7.What is the process for return or replacement of 3KASMC28AHM3_A/I?
All 3KASMC28AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC28AHM3_A/I, 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 3KASMC28AHM3_A/I part is unused and in its original packaging.
Return procedure for 3KASMC28AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC28AHM3_A/I Tags
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