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Vishay General Semiconductor - Diodes Division 3KASMC12AHE3_A/H
- Part No.:
- 3KASMC12AHE3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC12AHE3_A/H.pdf
- Description:
- TVS DIODE 12VWM 19.9VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,316
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Product details
Overview
3KASMC12AHE3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 12 V stand-off voltage (VWM), 13.3–14.7 V breakdown (VBR), 3000 W peak pulse power (10/1000 μs), 151 A peak surge current (IPPM), and 19.9 V clamping voltage (VC) - deployed for automotive power line and sensor signal protection.
For engineers reviewing the 3KASMC12AHE3_A/H datasheet, 3KASMC12AHE3_A/H pinout, 3KASMC12AHE3_A/H application, or 3KASMC12AHE3_A/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, TJ = 185 °C operation, MSL Level 1 moisture sensitivity, and DO-214AB thermal performance under high-reliability automotive transients.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress at junction temperatures up to +185 °C. Its low incremental surge resistance and fast response time ensure effective suppression of inductive switching spikes and ESD events on 12 V automotive rails.
The device operates exclusively in unidirectional mode with cathode band marking, meets J-STD-020 MSL Level 1 (260 °C peak reflow), and is qualified per AEC-Q101 - confirming suitability for under-hood and ADAS sensor interface protection where thermal derating and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 12 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 13.3 V / 14.7 V at 1 mA - guaranteed breakdown threshold defining turn-on precision |
| PPPM | 3000 W (10/1000 μs) - surge energy handling capacity for automotive load-dump immunity |
| VC @ IPPM | 19.9 V at 151 A - clamped voltage during worst-case surge, limiting downstream IC stress |
| TJ max. | +185 °C - enables placement near hot engine-control units without derating loss |
| IFSM | 200 A (8.3 ms half-sine) - withstands high-current inrush during system power-up or fault |
| RθJA | 77.5 °C/W - thermal resistance informs PCB pad layout requirements for sustained power dissipation |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by color band.
| 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 when cathode is held at higher potential |
| Cathode | Current exit terminal in forward bias; connected to protected line (e.g., 12 V rail or signal) | Defines unidirectional clamping direction - absorbs positive transients relative to Anode reference |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier design ensures stable VBR and leakage over temperature and lifetime |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, UHAST, and mechanical shock testing |
| MSL Level 1 rating | Supports standard SMT reflow without baking - no moisture sensitivity concerns pre-assembly |
| Low clamping ratio (VC/VBR) | 19.9 V / 13.3 V ≈ 1.49 - tight voltage margin preserves margin between clamping and IC absolute max ratings |
| High TJ capability | Rated to +185 °C junction - eliminates thermal derating in engine compartment applications |
Applications
| Automotive Power Rail Protection | ADAS Sensor Signal Line Protection |
|---|---|
Use Scenario: Suppresses load-dump transients (ISO 7637-2 Pulse 5a) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp surges above 12 V. Use Value: Limits rail voltage to ≤19.9 V during 3000 W pulses, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shields CAN, LIN, or analog sensor outputs (e.g., radar, camera, ultrasonic) from ESD and coupled noise. IC Role / Device Role / Timing Role: Low-capacitance TVS mounted at connector interface to shunt fast transients before entering signal conditioning ICs. Use Value: Clamps ±15 kV contact ESD (IEC 61000-4-2) with sub-nanosecond response, preserving signal integrity below 100 MHz bandwidth. |
| Industrial Motor Drive Control | Telecom Power Supply Input |
Use Scenario: Protects gate drivers and isolated feedback circuits from inductive kickback in BLDC motor inverters. IC Role / Device Role / Timing Role: Mounted across IGBT/MOSFET gate-source or supply rails to absorb switching-induced dv/dt spikes. Use Value: Withstands 200 A surge (8.3 ms) and maintains <2 μA leakage at 12 V, ensuring minimal bias error in precision gate control. |
Use Scenario: Guards AC/DC and DC/DC converter inputs against lightning-induced surges (IEC 61000-4-5) in base station power systems. IC Role / Device Role / Timing Role: Primary-stage TVS on 12–48 V input bus to limit surge energy before upstream fusing and filtering. Use Value: Delivers 3000 W peak power handling with 185 °C TJ rating, enabling compact heatsink-free designs in sealed telecom enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12A | Lower PPPM (400 W), same DO-214AC (SMA) package, VBR 13.3–14.7 V, VC = 19.9 V | Not AEC-Q101 qualified; limited to commercial/industrial use; insufficient for automotive load-dump | Select only for cost-sensitive non-automotive designs with lower surge exposure |
| 1.5KE12A | Higher power (1500 W), axial DO-201 package, VBR 12.8–14.2 V, VC = 19.0 V, no AEC-Q101 | Through-hole mounting; incompatible with automated SMT lines; unsuitable for space-constrained automotive PCBs | Use only for legacy through-hole systems requiring field-serviceable replacement |
Compared with SMAJ12A and 1.5KE12A, the 3KASMC12AHE3_A/H provides triple the peak pulse power, AEC-Q101 validation, and SMT-compatible DO-214AB packaging - making it the sole choice for new automotive electronics requiring ISO 16750-2 compliance and zero-layout rework.
Availability
3KASMC12AHE3_A/H is available at Aetrix Electronics and suitable for automotive ECU protection, ADAS sensor interface hardening, and industrial motor drive control requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 3KASMC12AHE3_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, optoelectronics, and passive components for automotive, industrial, and computing markets.
The 3KASMC series belongs to Vishay's PAR® (Protection Against Transients) family - engineered specifically for AEC-Q101-compliant, high-temperature-stable transient suppression in harsh automotive environments.
FAQ
What is the clamping voltage of the 3KASMC12AHE3_A/H under maximum surge conditions?
The 3KASMC12AHE3_A/H has a maximum clamping voltage (VC) of 19.9 V at its rated peak pulse current (IPPM) of 151 A using a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream components see no more than 19.9 V during worst-case transients - critical for protecting 24 V-tolerant logic and analog interfaces. The 3KASMC12AHE3_A/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC12AHE3_A/H suitable for automotive applications requiring AEC-Q101 qualification?
Yes, the 3KASMC12AHE3_A/H is explicitly AEC-Q101 qualified, as confirmed in Vishay document 89962. It undergoes stress testing for high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and mechanical shock - meeting all requirements for under-hood and safety-critical vehicle systems. The 3KASMC12AHE3_A/H is not a generic TVS; it is certified for automotive use without additional qualification effort.
What does the "_A/H" suffix mean in 3KASMC12AHE3_A/H?
The "_A/H" suffix in 3KASMC12AHE3_A/H denotes the packaging configuration: "H" indicates 7-inch plastic tape-and-reel delivery with 850 units per reel, per Vishay's ordering information table. The "A" identifies the revision level of the base P/NHM3 construction, and "E3" confirms RoHS-compliant matte tin plating. This exact suffix defines the physical form factor, quantity, and compliance status shipped by Aetrix Electronics.
Can the 3KASMC12AHE3_A/H replace older SMAJ12A devices in existing designs?
No - the 3KASMC12AHE3_A/H is not a drop-in replacement for SMAJ12A due to different packages (DO-214AB vs. DO-214AC) and significantly higher power rating (3000 W vs. 400 W). While both share similar VBR and VC, the 3KASMC12AHE3_A/H requires larger PCB pads and thermal relief per DO-214AB outline. Replacing SMAJ12A with 3KASMC12AHE3_A/H demands layout revision and revalidation of surge performance and thermal behavior.
What is the maximum junction temperature rating for the 3KASMC12AHE3_A/H?
The 3KASMC12AHE3_A/H is rated for a maximum junction temperature (TJ max.) of +185 °C, verified per AEC-Q101 test conditions. This allows direct placement near heat sources such as power MOSFETs or engine control units without thermal derating penalties - unlike standard TVS diodes limited to +150 °C. The 3KASMC12AHE3_A/H sustains full 3000 W surge capability up to this temperature, as shown in Figure 2 of its datasheet.
3KASMC12AHE3_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):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 151A
- 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)
3KASMC12AHE3_A/H FAQ
1.How can I place an order for 3KASMC12AHE3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC12AHE3_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 3KASMC12AHE3_A/H reliable?
The price and inventory of 3KASMC12AHE3_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 3KASMC12AHE3_A/H is usually 5 days.
3.What payment methods are accepted for 3KASMC12AHE3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC12AHE3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC12AHE3_A/H?
3KASMC12AHE3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC12AHE3_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 3KASMC12AHE3_A/H?
For technical support, including 3KASMC12AHE3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC12AHE3_A/H requirements.
6.How does Aetrix verify that 3KASMC12AHE3_A/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC12AHE3_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 3KASMC12AHE3_A/H meets industry standards.
7.What is the process for return or replacement of 3KASMC12AHE3_A/H?
All 3KASMC12AHE3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC12AHE3_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 3KASMC12AHE3_A/H part is unused and in its original packaging.
Return procedure for 3KASMC12AHE3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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