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Vishay General Semiconductor - Diodes Division 3KASMC20HE3_A/H
- Part No.:
- 3KASMC20HE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC20HE3_A/H.pdf
- Description:
- TVS DIODE 20VWM 35.8VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,020
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Product details
Overview
3KASMC20HE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® Transient Voltage Suppressor (TVS) diode in DO-214AB (SMC) package, rated for 3000 W peak pulse power (10/1000 μs), 20 V stand-off voltage (VWM), and 32.4 V clamping voltage (VC) at 92.6 A peak surge current - deployed for automotive-grade overvoltage protection of power rails and signal lines in engine control units and ADAS sensor interfaces.
For engineers reviewing the 3KASMC20HE3_A/H datasheet, 3KASMC20HE3_A/H pinout, 3KASMC20HE3_A/H application, or 3KASMC20HE3_A/H equivalent, key selection criteria include its AEC-Q101 qualification, 185 °C maximum junction temperature, low incremental surge resistance, uni-directional polarity, and MSL Level 1 reflow compatibility up to 260 °C.
Technical Context
This TVS diode employs passivated anisotropic rectifier technology optimized for high-temperature stability and fast transient response. Its 10/1000 μs waveform clamping performance is validated across -65 °C to +185 °C operating range, with thermal resistance RθJA = 77.5 °C/W and RθJL = 18.3 °C/W enabling robust thermal management on standard PCB layouts.
The device operates exclusively in uni-directional mode, with cathode denoted by a color band. It delivers 3.5 V maximum forward voltage at 100 A and supports 200 A non-repetitive forward surge current (8.3 ms half-sine), meeting stringent automotive reliability requirements without requiring external biasing or control circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 20 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe working margin for 24 V automotive systems. |
| VBR (min/max) | 22.2 V / 24.5 V - Breakdown voltage range at 1 mA test current; ensures predictable turn-on threshold under production tolerance. |
| VC @ IPPM | 32.4 V at 92.6 A - Clamped voltage during 10/1000 μs surge; limits downstream IC stress below 33 V in 24 V rail protection. |
| PPPM | 3000 W - Peak pulse power handling capability; sustains high-energy transients from load dump or inductive switching. |
| TJ max. | +185 °C - Maximum junction temperature rating; enables operation in under-hood environments without derating. |
| IR @ VWM | 1.0 μA - Reverse leakage at stand-off voltage; minimizes standby power loss in always-on vehicle modules. |
| Package | DO-214AB (SMC) - Industry-standard surface-mount outline with 7.11 mm × 6.60 mm footprint and 3.20 mm height; compatible with automated SMT assembly. |
Pinout & Package
DO-214AB (SMC) package with two terminals: anode and cathode. Cathode identified by molded color band. Designed for solder reflow per J-STD-020 MSL Level 1 (peak 260 °C). Matte tin-plated leads meet JESD 22-B102 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward conduction | Connected to protected line's lower-potential side (e.g., ground or return path) in uni-directional clamp configuration. |
| Cathode | Current exit terminal in forward conduction; clamping node | Connected to protected line's higher-potential side (e.g., 24 V rail); color band marks this terminal for orientation verification. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronic systems including powertrain and chassis applications per stress test requirements. |
| Junction passivation | Enhanced long-term reliability under high humidity and temperature cycling; prevents parametric drift in harsh environments. |
| 10/1000 μs waveform clamping | Stable 32.4 V clamping at 92.6 A enables precise overvoltage limiting for CAN FD, LIN, and sensor supply rails. |
| Low Rsurge | Minimal incremental surge resistance ensures minimal voltage overshoot during fast transients (<1 ns response time). |
| MSL Level 1 | Zero floor life limitation; supports unlimited storage and single-reflow processing at 260 °C peak without baking. |
Applications
| Automotive Power Rail Protection | Engine Control Unit (ECU) Input Stage |
|---|---|
Use Scenario: Suppresses load dump transients (ISO 16750-2 Pulse 5a) on 24 V battery-fed power inputs in body control modules. IC Role / Device Role / Timing Role: Uni-directional TVS clamps positive surges above 24 V while remaining high-impedance during normal operation. Use Value: Limits voltage to ≤32.4 V during 3000 W pulses, protecting downstream DC-DC converters and microcontrollers rated for 36 V absolute max. |
Use Scenario: Protects ECU main power input against alternator-induced spikes and relay-switching transients. IC Role / Device Role / Timing Role: Fast-response transient suppressor placed upstream of LDO regulators and MCU power pins. Use Value: Withstands 200 A 8.3 ms surge and maintains <1.0 μA leakage at 20 V, ensuring low quiescent current in always-on ignition circuits. |
| ADAS Camera Sensor Interface | Industrial 24 V PLC I/O Module |
Use Scenario: Shields MIPI CSI-2 power and reference lines in automotive surround-view cameras exposed to ESD and conducted noise. IC Role / Device Role / Timing Role: Standoff-rated TVS on 2.8 V or 3.3 V auxiliary rails; used with series ferrite beads for combined ESD + EFT filtering. Use Value: 185 °C TJ rating allows placement near heat-generating image sensors; 32.4 V clamping prevents latch-up in analog front-end ICs. |
Use Scenario: Guards digital input channels in programmable logic controllers subjected to inductive kickback from solenoid drivers. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V optocoupler input side, paired with series current-limiting resistor. Use Value: 3000 W pulse rating absorbs repetitive 100 V/1 A transients per IEC 61000-4-4; RoHS-compliant matte tin terminations ensure solder joint integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ20A | Lower PPPM (400 W), same DO-214AC (SMA) package; VWM = 20 V, VC = 32.4 V, but IPPM = 12.3 A only. | Not suitable for automotive load dump; limited to low-energy ESD and EFT events in consumer electronics. | Select SMAJ20A only for cost-sensitive, non-automotive applications where surge energy is <50 mJ. |
| SMCJ20A | Same DO-214AB (SMC) package and 3000 W rating, but VWM = 20 V, VC = 32.4 V, and TJ max = 175 °C (vs. 185 °C). | Lacks AEC-Q101 qualification; not approved for automotive safety-critical modules. | Choose SMCJ20A for industrial 24 V systems requiring high pulse power but no automotive qualification. |
Compared with SMAJ20A and SMCJ20A, the 3KASMC20HE3_A/H uniquely combines AEC-Q101 qualification, 185 °C junction rating, and full 3000 W 10/1000 μs capability in a single automotive-grade TVS - making it the only option qualified for under-hood deployment in ISO 16750-compliant ECUs.
Availability
3KASMC20HE3_A/H is available at Aetrix Electronics and suitable for automotive power rail protection, engine control unit (ECU) input stage hardening, and ADAS camera sensor interface protection requiring stable component supply and long-term lifecycle assurance.
Supply support for 3KASMC20HE3_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 passive components for automotive, industrial, and computing markets.
The 3KASMCxxA family was engineered specifically for AEC-Q101-compliant transient suppression in high-temperature automotive subsystems - emphasizing thermal robustness, surge endurance, and process-controlled consistency across voltage grades.
FAQ
What is the clamping voltage of the 3KASMC20HE3_A/H at its rated peak pulse current?
The 3KASMC20HE3_A/H has a maximum clamping voltage (VC) of 32.4 V at its rated peak pulse current (IPPM) of 92.6 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and ensures downstream components see no more than 32.4 V during worst-case surge events, critical for safeguarding 36 V-rated power management ICs in automotive applications.
Is the 3KASMC20HE3_A/H qualified for automotive use?
Yes, the 3KASMC20HE3_A/H is AEC-Q101 qualified and explicitly rated for automotive applications. It meets the stress test requirements for temperature cycling, humidity, mechanical shock, and surge endurance defined in AEC-Q101 Rev D, and is designed for under-hood deployment with a maximum junction temperature of +185 °C - confirmed in Vishay Document Number 89962.
What does the "_A/H" suffix mean in 3KASMC20HE3_A/H?
The "_A/H" suffix in 3KASMC20HE3_A/H indicates the packaging configuration: "H" denotes 7-inch diameter plastic tape and reel with 850 units per reel, and "A" identifies the base P/NHM3 variant - RoHS-compliant, AEC-Q101 qualified, and meeting JESD 201 Class 2 whisker resistance. The "E3" denotes matte tin plating per J-STD-002.
Can the 3KASMC20HE3_A/H be used in bi-directional protection circuits?
No, the 3KASMC20HE3_A/H is specified for uni-directional polarity only, as confirmed in the Vishay datasheet (Document Number 89962, page 1). It features a cathode band marking and is not rated for reverse standoff or clamping in the reverse direction. For bi-directional protection, a dedicated bi-directional TVS such as SMBJ20CA must be selected instead.
What is the thermal resistance from junction to ambient for the 3KASMC20HE3_A/H?
The typical thermal resistance from junction to ambient (RθJA) for the 3KASMC20HE3_A/H is 77.5 °C/W when mounted on the minimum recommended pad layout per the Vishay datasheet. This value assumes no heatsink and standard FR-4 PCB construction; actual thermal performance improves significantly with copper pour or thermal vias.
3KASMC20HE3_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):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 35.8V
- Current - Peak Pulse (10/1000µs):
- 83.8A
- 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)
3KASMC20HE3_A/H FAQ
1.How can I place an order for 3KASMC20HE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC20HE3_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 3KASMC20HE3_A/H reliable?
The price and inventory of 3KASMC20HE3_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 3KASMC20HE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC20HE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC20HE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC20HE3_A/H?
3KASMC20HE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC20HE3_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 3KASMC20HE3_A/H?
For technical support, including 3KASMC20HE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC20HE3_A/H requirements.
6.How does Aetrix verify that 3KASMC20HE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC20HE3_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 3KASMC20HE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC20HE3_A/H?
All 3KASMC20HE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC20HE3_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 3KASMC20HE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC20HE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC20HE3_A/H Tags
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