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Vishay General Semiconductor - Diodes Division 3KASMC22AHM3_B/H
- Part No.:
- 3KASMC22AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
3KASMC22AHM3_B/H.pdf
- Description:
- TVS DIODE 22VWM 35.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:682
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Product details
Overview
3KASMC22AHM3_B/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, rated for 22 V stand-off voltage, 25.7 V nominal breakdown voltage at 1 mA, 35.5 V clamping voltage at 84.5 A peak pulse current, and 3000 W peak pulse power with 10/1000 μs waveform. It operates up to 185 °C junction temperature and is AEC-Q101 qualified for automotive electronics protection.
For engineers reviewing the 3KASMC22AHM3_B/H datasheet, 3KASMC22AHM3_B/H pinout, 3KASMC22AHM3_B/H application, or 3KASMC22AHM3_B/H equivalent, key selection criteria include unidirectional clamping performance, high-temperature reliability, MSL Level 1 solderability, halogen-free RoHS compliance, and suitability for inductive load switching transients in automotive sensor signal lines.
Technical Context
This TVS diode uses passivated anisotropic rectifier technology optimized for junction stability under repetitive surge stress. Its 10/1000 μs waveform rating reflects standardized IEC 61000-4-5 surge immunity testing conditions, and its 185 °C maximum junction temperature enables operation in under-hood automotive environments without derating penalties up to that limit.
The device exhibits low incremental surge resistance and fast response time-critical for protecting downstream MOSFETs and ICs from sub-microsecond transients. Its cathode-band polarity marking and matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for reliable reflow soldering and whisker resistance per JESD 201 Class 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 22 V - Maximum reverse working voltage before clamping begins; defines safe operating margin for 24 V automotive systems. |
| VBR (min/typ/max) | 24.4 / 25.7 / 26.9 V at 1 mA - Ensures consistent breakdown across production lots and temperature range. |
| VC @ IPPM | 35.5 V at 84.5 A - Clamping voltage limits stress on protected ICs during 3000 W transient events. |
| PPPM | 3000 W - Peak pulse power handling capability per 10/1000 μs waveform, meeting ISO 7637-2 Pulse 1 & 2a requirements. |
| TJ max. | 185 °C - Enables use in high-temperature zones such as engine control units without thermal derating. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness. |
| Package | SMC (DO-214AB) - Industry-standard surface-mount outline with 7.75 mm × 6.22 mm footprint and 2.62 mm height. |
Pinout & Package
Package: SMC (DO-214AB), molded case with UL 94 V-0 flammability rating; matte tin-plated leads; cathode indicated by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to ground or low-side reference in unidirectional TVS configurations. |
| Cathode | Current exit terminal during forward conduction; clamping node in reverse bias | Connected to protected line (e.g., CAN_H, LIN, sensor output); absorbs transient energy into ground path. |
Key Features
| Feature | Design Value |
|---|---|
| Junction passivation | Optimized anisotropic rectifier process ensures stable VBR over lifetime and temperature cycling. |
| High-temperature capability | Rated for continuous operation up to TJ = 185 °C, eliminating need for external heatsinking in most automotive PCB layouts. |
| MSL Level 1 rating | Compatible with standard 260 °C lead-free reflow profiles without moisture sensitivity concerns. |
| Halogen-free & RoHS | HM3 suffix confirms compliance with JEDEC J-STD-609A Class 1 and EU RoHS Directive 2011/65/EU. |
| Low clamping ratio | VC/VBR ≈ 1.39 - Minimizes overvoltage exposure to protected circuitry during surge events. |
Applications
| Automotive Powertrain Sensors | Industrial Motor Drive Inputs |
|---|---|
Use Scenario: Protecting crankshaft/camshaft position sensor outputs from load dump and alternator ripple in 12 V/24 V vehicle electrical systems. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between sensor output line and chassis ground to shunt transients before reaching MCU input pins. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontroller inputs while maintaining signal integrity under ISO 16750-2 test conditions. | Use Scenario: Safeguarding analog feedback lines (e.g., current sense, encoder signals) in variable-frequency drives exposed to IGBT switching noise. IC Role / Device Role / Timing Role: Fast-response transient suppressor installed at motor controller board edge connectors to absorb coupled EMI from power stage. Use Value: Maintains ±0.5 % measurement accuracy by limiting transient-induced offset shifts during 20 kHz PWM operation. |
| Telecom Line Interface Protection | Consumer Appliance Control Boards |
Use Scenario: Shielding RS-485 transceiver data lines in outdoor base stations from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary clamping element in multi-stage protection scheme, coordinated with GDT and series impedance. Use Value: Achieves >20 kV (10/700 μs) immunity per ITU-T K.21 while preserving signal rise time below 10 ns. | Use Scenario: Guarding microcontroller reset and communication lines in washing machine main control boards against relay coil flyback spikes. IC Role / Device Role / Timing Role: Standalone TVS mounted directly at connector interface to intercept inductive kick before entering PCB routing. Use Value: Eliminates field returns due to MCU resets caused by 100 V/100 ns transients from solenoid actuation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ22AHE3_A/H | Lower PPPM (400 W), same VWM/VBR, SMA package (smaller thermal mass) | Not suitable for 3000 W surge events; limited to consumer-grade I/O protection | Select only when peak surge energy is ≤ 0.4 J and ambient temperature remains < 85 °C. |
| SMCJ22AHE3_A/H | Same 3000 W rating and SMC package, but HE3 suffix (not HM3) - RoHS-compliant but not halogen-free | Lacks halogen-free certification required for some Tier 1 automotive programs | Use where AEC-Q101 qualification is needed but halogen-free material is not mandated by OEM spec. |
Compared with 3KASMC22AHM3_B/H, SMAJ22AHE3_A/H offers lower cost and smaller footprint but insufficient energy handling for automotive load-dump scenarios, while SMCJ22AHE3_A/H matches surge capability and form factor but lacks halogen-free compliance critical for modern EV platforms.
Availability
3KASMC22AHM3_B/H is available at Aetrix Electronics and suitable for automotive powertrain modules, industrial motor controllers, telecom infrastructure interfaces, and consumer appliance control boards requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 3KASMC22AHM3_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 quality systems certified to IATF 16949.
The 3KASMCxxA family targets high-reliability transient suppression in harsh environments, specifically engineered for AEC-Q101 compliance, 185 °C operation, and robust surge immunity in automotive and industrial applications.
FAQ
What is the clamping voltage of the 3KASMC22AHM3_B/H under a 10/1000 μs surge?
The 3KASMC22AHM3_B/H has a maximum clamping voltage (VC) of 35.5 V when subjected to its rated peak pulse current of 84.5 A using the standard 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures protected circuits remain within safe overvoltage margins during surge events. The 3KASMC22AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is the 3KASMC22AHM3_B/H suitable for 24 V automotive systems?
Yes, the 3KASMC22AHM3_B/H is explicitly designed for 24 V nominal automotive systems. Its 22 V stand-off voltage (VWM) provides adequate margin above normal operating voltage while allowing reliable clamping during load dump transients up to 3000 W. The 3KASMC22AHM3_B/H is AEC-Q101 qualified and rated for 185 °C junction temperature, making it appropriate for under-hood ECUs and body control modules.
What does the 'HM3' suffix indicate in 3KASMC22AHM3_B/H?
The 'HM3' suffix in 3KASMC22AHM3_B/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from HE3-suffix parts (RoHS-compliant but not halogen-free) and confirms compliance with JEDEC J-STD-609A Class 1. The 'B/H' indicates packaging in 7-inch tape-and-reel format with 850 units per reel. The 3KASMC22AHM3_B/H meets stringent environmental and reliability requirements for modern automotive supply chains.
How does the thermal resistance of the 3KASMC22AHM3_B/H affect PCB layout?
The 3KASMC22AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 77.5 °C/W and junction-to-leads resistance (RθJL) of 18.3 °C/W. To maintain TJ ≤ 185 °C under worst-case surge conditions, PCB copper pour under the cathode/anode pads must follow Vishay's recommended minimum pad layout (0.185" × 0.126"). The 3KASMC22AHM3_B/H does not require external heatsinking for typical automotive duty cycles.
Can the 3KASMC22AHM3_B/H replace older SMAJ or SMBJ series TVS diodes?
The 3KASMC22AHM3_B/H is not a direct drop-in replacement for SMAJ or SMBJ series due to its larger SMC (DO-214AB) package and higher surge rating. While it shares the same VWM and VBR as SMAJ22A/SMBJ22A, the 3KASMC22AHM3_B/H requires revised PCB land pattern and offers superior 3000 W capability versus 400 W (SMAJ) or 600 W (SMBJ). Migration to 3KASMC22AHM3_B/H is recommended only when enhanced surge immunity is required.
3KASMC22AHM3_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):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 35.5V
- Current - Peak Pulse (10/1000µs):
- 84.5A
- 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)
3KASMC22AHM3_B/H FAQ
1.How can I place an order for 3KASMC22AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for 3KASMC22AHM3_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 3KASMC22AHM3_B/H reliable?
The price and inventory of 3KASMC22AHM3_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 3KASMC22AHM3_B/H is usually 5 days.
3.What payment methods are accepted for 3KASMC22AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 3KASMC22AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 3KASMC22AHM3_B/H?
3KASMC22AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 3KASMC22AHM3_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 3KASMC22AHM3_B/H?
For technical support, including 3KASMC22AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 3KASMC22AHM3_B/H requirements.
6.How does Aetrix verify that 3KASMC22AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All 3KASMC22AHM3_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 3KASMC22AHM3_B/H meets industry standards.
7.What is the process for return or replacement of 3KASMC22AHM3_B/H?
All 3KASMC22AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with 3KASMC22AHM3_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 3KASMC22AHM3_B/H part is unused and in its original packaging.
Return procedure for 3KASMC22AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
3KASMC22AHM3_B/H Tags
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