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Vishay General Semiconductor - Diodes Division 5KASMC28AHM3/9A
- Part No.:
- 5KASMC28AHM3/9A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
5KASMC28AHM3/9A.pdf
- Description:
- TVS DIODE 28VWM 45.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,908
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Product details
Overview
5KASMC28AHM3/9A from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMCJ) package, rated for 28 V stand-off voltage (VWM), 31.1–34.4 V breakdown (VBR), 5000 W peak pulse power (10/1000 µs), and 110.1 V clamping voltage at 110.1 A peak surge current. It operates from −65 °C to +185 °C and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 5KASMC28AHM3/9A datasheet, 5KASMC28AHM3/9A pinout, 5KASMC28AHM3/9A application, or 5KASMC28AHM3/9A equivalent, key selection criteria include its 28 V stand-off rating, 110.1 V clamping performance under 110.1 A surge, unidirectional polarity, DO-214AB thermal resistance (RθJA = 100 °C/W), and AEC-Q101 qualification for high-reliability automotive and industrial systems.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for junction stability under repetitive transients. Its 185 °C maximum junction temperature and MSL Level 1 rating (260 °C reflow peak) support high-temperature PCB assembly and extended operation in engine compartments or industrial control enclosures.
The device delivers low incremental surge resistance and fast response time to clamp voltage spikes induced by inductive load switching or lightning surges. Clamping occurs at 110.1 V when subjected to 110.1 A (10/1000 µs waveform), with only 2.0 µA reverse leakage at 28 V and 25 °C - enabling reliable protection of 28 V-rated MOSFETs and signal lines without parasitic loading.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 28 V - Maximum continuous reverse operating voltage before conduction begins; defines compatibility with 28 V nominal power rails. |
| VBR (Breakdown Voltage) | 31.1–34.4 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on margin above VWM. |
| VC (Clamping Voltage) | 110.1 V at 110.1 A (10/1000 µs) - Peak voltage seen by protected circuit during worst-case surge; determines safe margin for downstream ICs. |
| PPPM | 5000 W - Sustains 10/1000 µs transient energy without failure; suitable for high-energy automotive load-dump events. |
| TJ max. | +185 °C - Enables operation in under-hood environments and industrial motor drives without derating. |
| Polarity | Unidirectional - Protects against positive-going transients only; requires correct cathode orientation relative to protected line. |
| RθJA | 100 °C/W - Thermal resistance from junction to ambient on minimum recommended pad layout; informs heatsinking requirements. |
Pinout & Package
Package: DO-214AB (SMCJ), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; completes conduction path during transient clamping. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 28 V rail or signal); absorbs positive transients toward ground. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan. |
| 185 °C junction capability | Supports uninterrupted operation in high-ambient environments such as engine control units and power inverters. |
| 5000 W peak pulse power (10/1000 µs) | Withstands ISO 7637-2 Pulse 5a load-dump surges up to 120 V without degradation. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard 260 °C reflow without preconditioning or baking. |
| Low 2.0 µA leakage at VWM | Minimizes standby power loss and avoids false triggering in precision sensor or battery-backed circuits. |
Applications
| Automotive Power Rail Protection | Industrial Motor Drive Control |
|---|---|
Use Scenario: Suppresses load-dump transients on 24 V vehicle battery rails during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive surges to protect DC-DC converters and microcontrollers. Use Value: Withstands 5000 W pulses and operates up to 185 °C, meeting ISO 16750-2 requirements without derating. |
Use Scenario: Shields gate drivers and feedback sensors in variable-frequency drives from IGBT switching noise. IC Role / Device Role / Timing Role: Fast-response TVS limits voltage overshoot on 28 V auxiliary supply lines feeding isolated gate bias. Use Value: 110.1 V clamping ensures MOSFETs remain within safe SOA during 110.1 A surge events. |
| Telecom Power Interface | Consumer Appliance Control Board |
Use Scenario: Guards PoE-powered equipment front-end against lightning-induced surges on 28 V DC input. IC Role / Device Role / Timing Role: Primary overvoltage protection element placed upstream of DC-DC and Ethernet PHY. Use Value: Low 2.0 µA leakage preserves efficiency; DO-214AB footprint enables compact board layout near connectors. |
Use Scenario: Protects MCU I/O and relay driver outputs in smart HVAC controllers exposed to relay coil back-EMF. IC Role / Device Role / Timing Role: Standoff-rated TVS shunts inductive kickback from 28 V solenoid loads. Use Value: 31.1–34.4 V VBR provides robust margin above 28 V rail while avoiding false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A | Same VWM (28 V), lower PPPM (600 W), DO-214AA package (smaller footprint, higher RθJA) | Not AEC-Q101 qualified; limited to commercial/industrial use below 150 °C | Select SMBJ28A only for cost-sensitive non-automotive designs where 600 W surge capacity suffices. |
| 5.0SMDJ28A | Same VWM (28 V), higher PPPM (5000 W), DO-214AB package, but rated only to 175 °C TJ max | Lacks AEC-Q101 certification; not validated for automotive qualification stress tests | Choose 5.0SMDJ28A for high-power industrial applications requiring 175 °C operation but no automotive qualification. |
Compared with SMBJ28A and 5.0SMDJ28A, the 5KASMC28AHM3/9A uniquely combines 5000 W surge capability, 185 °C junction rating, and full AEC-Q101 qualification - making it the only option qualified for under-hood automotive deployment with sustained thermal margin.
Availability
5KASMC28AHM3/9A is available at Aetrix Electronics and suitable for automotive power rail protection, industrial motor drive control, and telecom power interface applications requiring stable component supply, long-term lifecycle assurance, and AEC-Q101 compliance.
Supply support for 5KASMC28AHM3/9A 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, TVS devices, and optoelectronics with emphasis on reliability, thermal performance, and automotive qualification.
The 5KASMCxxA series was designed specifically for high-energy transient suppression in harsh-environment automotive and industrial systems, prioritizing AEC-Q101 compliance, 185 °C operation, and robust 10/1000 µs surge handling.
FAQ
What is the clamping voltage of the 5KASMC28AHM3/9A under a 10/1000 µs surge?
The 5KASMC28AHM3/9A clamps to 110.1 V when subjected to its rated peak pulse current of 110.1 A using a 10/1000 µs waveform. This value is measured per Figure 1 and Table 1 in Vishay Document 89432 and defines the maximum voltage imposed on protected circuitry during standardized surge events. The 5KASMC28AHM3/9A maintains this clamping performance across its full operating temperature range.
Is the 5KASMC28AHM3/9A suitable for automotive applications?
Yes - the 5KASMC28AHM3/9A is AEC-Q101 qualified and rated for operation up to +185 °C junction temperature, making it suitable for under-hood automotive applications including engine control units, body control modules, and ADAS power supplies. Its DO-214AB package meets MSL Level 1 and supports lead-free reflow at 260 °C. The 5KASMC28AHM3/9A is explicitly listed in Vishay's AEC-Q101 stress test report for this family.
What does the "HM3/9A" suffix mean in 5KASMC28AHM3/9A?
The "HM3" suffix denotes halogen-free, RoHS-compliant construction with matte tin-plated leads and JESD201 Class 2 whisker resistance. The "/9A" indicates packaging in 13-inch diameter plastic tape and reel, with a base quantity of 3500 units. This differs from "/57", which uses 7-inch reels with 850-unit quantities. The 5KASMC28AHM3/9A is fully interchangeable electrically and thermally with other HM3-suffix variants.
How does the 5KASMC28AHM3/9A compare to bidirectional TVS diodes?
The 5KASMC28AHM3/9A is unidirectional and protects only against positive-going transients on a referenced line (e.g., 28 V rail to ground). Bidirectional TVS diodes would be required for AC-coupled or floating signal lines. Its unidirectional design yields lower leakage (2.0 µA at 28 V) and tighter VBR tolerance than comparable bidirectional parts - a key advantage for DC power rail protection. The 5KASMC28AHM3/9A must be oriented with cathode toward the protected line.
What is the thermal resistance of the 5KASMC28AHM3/9A in standard mounting?
The 5KASMC28AHM3/9A has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended pad layout per Vishay Document 89432. This value assumes no additional heatsinking and defines the temperature rise per watt of steady-state power dissipation. For higher power handling, the device supports junction-to-mount (RθJM) of 20.8 °C/W when soldered to a large copper plane, enabling improved surge endurance in thermally constrained layouts.
5KASMC28AHM3/9A 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):
- -
- Power - Peak Pulse:
- 5000W (5kW)
- 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)
5KASMC28AHM3/9A FAQ
1.How can I place an order for 5KASMC28AHM3/9A through Aetrix?
Please submit a Request for Quotation (RFQ) for 5KASMC28AHM3/9A 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 5KASMC28AHM3/9A reliable?
The price and inventory of 5KASMC28AHM3/9A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 5KASMC28AHM3/9A is usually 5 days.
3.What payment methods are accepted for 5KASMC28AHM3/9A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 5KASMC28AHM3/9A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 5KASMC28AHM3/9A?
5KASMC28AHM3/9A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 5KASMC28AHM3/9A 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 5KASMC28AHM3/9A?
For technical support, including 5KASMC28AHM3/9A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 5KASMC28AHM3/9A requirements.
6.How does Aetrix verify that 5KASMC28AHM3/9A is sourced from the original manufacturer or authorized distributors?
All 5KASMC28AHM3/9A 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 5KASMC28AHM3/9A meets industry standards.
7.What is the process for return or replacement of 5KASMC28AHM3/9A?
All 5KASMC28AHM3/9A units undergo pre-shipment inspection (PSI). If there is an issue with 5KASMC28AHM3/9A, 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 5KASMC28AHM3/9A part is unused and in its original packaging.
Return procedure for 5KASMC28AHM3/9A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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