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Vishay General Semiconductor - Diodes Division 3KASMC43AHM3_B/H
- Part No.:
- 3KASMC43AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC43AHM3_B/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,895
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Product details
Overview
3KASMC43AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount PAR® transient voltage suppressor in SMC (DO-214AB) package, rated for 43 V stand-off voltage, 52.8 V breakdown at 1 mA, 3000 W peak pulse power (10/1000 μs), 69.4 V clamping voltage at 43.2 A, and 185 °C maximum junction temperature - deployed for automotive-grade overvoltage protection of MOSFETs and sensor signal lines.
For engineers reviewing the 3KASMC43AHM3_B/H datasheet, 3KASMC43AHM3_B/H pinout, 3KASMC43AHM3_B/H application, or 3KASMC43AHM3_B/H equivalent, key selection criteria include unidirectional polarity, AEC-Q101 qualification, MSL Level 1 rating, 77.5 °C/W junction-to-ambient thermal resistance, and halogen-free RoHS compliance per ordering suffix HM3.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology to deliver stable clamping under repetitive surge stress up to TJ = 185 °C. Its low incremental surge resistance and fast response time ensure effective suppression of transients induced by inductive load switching in automotive ECUs and industrial motor drives.
The device operates exclusively in unidirectional mode with cathode band marking, meets JESD201 Class 2 whisker testing, and is qualified to AEC-Q101 - confirming suitability for under-hood automotive applications where thermal cycling and long-term reliability are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR (min/typ/max) | 47.8 / 50.3 / 52.8 V at 1 mA - precise breakdown threshold enabling accurate overvoltage trip point setting |
| VC @ IPPM | 69.4 V at 43.2 A - clamping voltage limits downstream IC stress during 3000 W transient events |
| PPPM | 3000 W (10/1000 μs) - robust surge handling for ISO 7637-2 Pulse 1/2a/5a-compliant automotive protection |
| TJ max. | +185 °C - enables placement near high-temperature components like power MOSFETs without derating |
| RθJA | 77.5 °C/W - defines thermal performance on standard PCB pad layout; requires thermal relief design for sustained power dissipation |
| Polarity | Unidirectional - protects against positive-going transients only; requires external circuit coordination for bidirectional threats |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, matte tin-plated leads, UL 94 V-0 molding compound, cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane; carries full surge current during clamping |
| Cathode | Protected line connection | Connected to I/O line or power rail being protected; voltage referenced to anode during clamping |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Enables stable leakage and breakdown characteristics across 185 °C operation and 1000+ thermal cycles |
| AEC-Q101 qualification | Validates reliability for automotive powertrain and body electronics per stress test requirements |
| MSL Level 1 (260 °C) | Allows single-reflow assembly without moisture sensitivity concerns or baking preconditioning |
| Halogen-free & RoHS | Meets EU Directive 2011/65/EU and JEDEC J-STD-609A Class 1 for green manufacturing compliance |
| Low RSURGE | Minimizes voltage overshoot during fast-rising transients (<1 ns rise time), improving system immunity margin |
Applications
| Automotive Power Supply Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed microcontroller power rails in engine control units against load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamping device placed between VIN and GND, activated within nanoseconds of overvoltage onset. Use Value: Limits transient voltage to ≤69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies downstream. | Use Scenario: Shielding analog output lines of pressure sensors in factory automation PLC modules from ESD and relay coil kickback. IC Role / Device Role / Timing Role: Signal-line TVS connected between sensor output and ground, absorbing ±8 kV contact ESD per IEC 61000-4-2. Use Value: Maintains signal integrity below 100 mV perturbation during 30 A surge, preserving 12-bit ADC accuracy. |
| Telecom DC Power Feeds | Consumer Appliance Motor Drive Protection |
Use Scenario: Safeguarding PoE-powered Ethernet switch ports against lightning-induced surges on 48 V DC input lines. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail, coordinated with upstream fuse and secondary-side TVS for staged protection. Use Value: Withstands 3000 W pulses without degradation, supporting EN 61000-4-5 Level 4 compliance (4 kV line-earth). | Use Scenario: Suppressing back-EMF spikes from brushed DC motors in smart home vacuum cleaners and HVAC blowers. IC Role / Device Role / Timing Role: Flyback diode replacement with superior clamping precision and thermal stability at 105 °C ambient. Use Value: Reduces MOSFET drain-source voltage overshoot by 35% vs. standard FRD, lowering switching loss and thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ43AHE3_A/H | Same SMC package, 43 V VWM, but lower PPPM (400 W) and higher VC (70.1 V); not AEC-Q101 qualified | Limited to consumer/industrial use; unsuitable for automotive under-hood deployment | Select when cost sensitivity outweighs automotive qualification and surge robustness requirements |
| SMCJ43AHE3_A/H | Same SMC package, 43 V VWM, 3000 W PPPM, but VBR min = 47.8 V (identical), VC = 69.4 V (identical); AEC-Q101 qualified | Functionally identical clamping behavior; differs only in JEDEC prefix and internal process traceability | Acceptable drop-in alternative if supply chain allocation favors SMCJ series; verify HM3 halogen-free status separately |
Compared with 3KASMC43AHM3_B/H, SMAJ43AHE3_A/H offers lower surge capacity and no automotive qualification, while SMCJ43AHE3_A/H matches all key electrical and reliability specs but may differ in material declaration documentation and lot traceability scope.
Availability
3KASMC43AHM3_B/H is available at Aetrix Electronics and suitable for automotive ECU design, industrial sensor interface development, and telecom DC power feed protection requiring stable component supply with guaranteed halogen-free and AEC-Q101-compliant sourcing.
Supply support for 3KASMC43AHM3_B/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 designs and manufactures discrete semiconductors including diodes, rectifiers, and TVS devices, with global manufacturing and testing facilities focused on high-reliability power and protection components.
The 3KASMCxxA family targets high-temperature, high-surge automotive and industrial applications - engineered specifically to replace older-generation TVS diodes in under-hood and factory-floor environments where thermal stability and long-term clamping consistency are mandatory.
FAQ
What is the clamping voltage of the 3KASMC43AHM3_B/H at its rated peak pulse current?
The 3KASMC43AHM3_B/H has a maximum clamping voltage (VC) of 69.4 V at 43.2 A peak pulse current (IPPM), measured using the standardized 10/1000 μs waveform. This value ensures predictable voltage limiting during surge events and is verified per ANSI/IEEE C62.35. The 3KASMC43AHM3_B/H maintains this clamping performance across its full operating temperature range up to +185 °C junction temperature.
Is the 3KASMC43AHM3_B/H qualified for automotive applications?
Yes, the 3KASMC43AHM3_B/H is AEC-Q101 qualified, as confirmed by Vishay's official documentation and ordering code suffix HM3. It meets the stress test requirements for automotive discrete semiconductors, including temperature cycling, humidity bias, and mechanical shock. The 3KASMC43AHM3_B/H is intended for use in engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical.
What does the 'HM3' suffix indicate in 3KASMC43AHM3_B/H?
The 'HM3' suffix in 3KASMC43AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes the part from HE3-suffixed variants (RoHS-compliant and AEC-Q101 qualified but not halogen-free) and confirms compliance with JEDEC J-STD-609A Class 1 for green materials. The 3KASMC43AHM3_B/H also passes JESD201 Class 2 whisker testing, ensuring solder joint reliability in high-vibration environments.
Can the 3KASMC43AHM3_B/H be used in bidirectional protection circuits?
No, the 3KASMC43AHM3_B/H is unidirectional only, as explicitly stated in the Vishay datasheet. It protects against positive-going transients on the cathode side relative to the anode. For bidirectional protection, two 3KASMC43AHM3_B/H devices must be connected in series opposition, or a dedicated bidirectional TVS such as SMBJ43CA should be selected. Using the 3KASMC43AHM3_B/H in reverse-biased configuration risks permanent breakdown.
What is the thermal resistance junction-to-ambient for the 3KASMC43AHM3_B/H?
The 3KASMC43AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W when mounted on the minimum recommended pad layout per Vishay's SMC outline drawing. This value assumes still air convection and no additional copper pour or heatsinking. For reliable operation at elevated ambient temperatures, PCB layout must provide adequate thermal relief, and power dissipation must remain within the 6.0 W derated limit per Figure 6 of the datasheet.
3KASMC43AHM3_B/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 43.2A
- 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)
3KASMC43AHM3_B/H FAQ
1.How can I place an order for 3KASMC43AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC43AHM3_B/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 3KASMC43AHM3_B/H reliable?
The price and inventory of 3KASMC43AHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 3KASMC43AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC43AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC43AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC43AHM3_B/H?
3KASMC43AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC43AHM3_B/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 3KASMC43AHM3_B/H?
For technical support, including 3KASMC43AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC43AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC43AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC43AHM3_B/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 3KASMC43AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC43AHM3_B/H?
All 3KASMC43AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC43AHM3_B/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 3KASMC43AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC43AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC43AHM3_B/H Tags
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