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Vishay General Semiconductor - Diodes Division SMAJ150CAHM3_A/H
- Part No.:
- SMAJ150CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAHM3_A/H.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,365
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Product details
Overview
SMAJ150CAHM3_A/H from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping voltage transients up to 243 VPP at 1.2 A peak pulse current, with 400 W peak pulse power (10/1000 μs), 150 V standoff voltage, and <1.0 μA reverse leakage at VWM, used to protect MOSFETs and sensor signal lines in automotive power electronics.
For engineers reviewing the SMAJ150CAHM3_A/H datasheet, SMAJ150CAHM3_A/H pinout, SMAJ150CAHM3_A/H application, or SMAJ150CAHM3_A/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 120 °C/W), junction temperature range (–55 °C to +150 °C), and halogen-free RoHS compliance per ordering code HM3.
Technical Context
This device operates as a voltage-clamped crowbar during ESD or surge events, leveraging an avalanche breakdown mechanism with typical breakdown voltage of 167–185 V at 1 mA test current. Its bidirectional symmetry ensures identical clamping behavior in both polarities, eliminating polarity-sensitive layout constraints.
Designed for high-reliability automotive applications, SMAJ150CAHM3_A/H features glass-passivated junctions, meets MSL Level 1 per J-STD-020, supports peak surge current up to 1.2 A (10/1000 μs), and maintains stable clamping voltage (VC ≤ 243 V) under repetitive transient stress at ≤0.01% duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 167 V / 185 V at IT = 1 mA - Confirmed avalanche onset range for reliable overvoltage detection |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage during 10/1000 μs surge, limiting downstream IC stress |
| PPPM | 400 W - Peak pulse power handling capacity under standard 10/1000 μs waveform |
| ID @ VWM | <1.0 μA - Negligible leakage current ensuring minimal standby power loss |
| TJ range | –55 °C to +150 °C - Full operational junction temperature range for under-hood automotive use |
| RθJA | 120 °C/W - Thermal resistance defining required PCB copper area for thermal management |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking; terminals are matte tin-plated for solderability per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; accepts surge current in either direction |
| Cathode | Transient current entry (positive polarity) | Second terminal of symmetrical PN junction; completes bidirectional conduction path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for modern vehicle platforms (HM3 suffix) |
| 400 W peak pulse power | Withstands ISO 7637-2 Pulse 1/2a/3a surges without degradation when mounted on 5 mm × 5 mm copper pads |
| Fast response time & low Rsurge | Sub-nanosecond turn-on enables protection of fast-switching MOSFET gates and CAN/LIN bus nodes |
| MSL Level 1 rating | Allows unlimited floor life and reflow at peak temperature up to 260 °C without moisture-related failure |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power rails in body control modules against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Bidirectional TVS clamp placed across input rail to shunt transients before reaching DC-DC converters and microcontrollers. Use Value: Limits clamped voltage to ≤243 V, preventing damage to 36 V-rated input stages while maintaining >150 V nominal operation. | Use Scenario: Safeguarding analog output lines of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) TVS placed directly at connector interface to absorb sub-100 ns ESD pulses. Use Value: Delivers <1.0 μA leakage at 150 V, preserving sensor accuracy and enabling direct placement without signal attenuation. |
| On-Board Charger (OBC) Input Stage | Motor Drive Gate Driver Protection |
Use Scenario: Front-end protection of AC/DC rectifier inputs subjected to lightning-induced surges per IEC 61000-4-5. IC Role / Device Role / Timing Role: Primary surge suppression element rated for 400 W (10/1000 μs), coordinated with upstream MOVs and fuses. Use Value: Withstands repeated 1.2/50 μs surges up to 2 kV due to low incremental surge resistance and thermal robustness. | Use Scenario: Shielding high-side/low-side gate drivers from Miller-induced voltage spikes during IGBT/MOSFET switching. IC Role / Device Role / Timing Role: Fast-clamping TVS connected between gate and source to clamp dv/dt-induced overshoot. Use Value: Sub-1 ns response ensures clamping occurs before gate oxide breakdown threshold is exceeded. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150CAHE3_A/H | RoHS-compliant but not halogen-free; lacks HM3 material certification | Acceptable for non-automotive industrial use where halogen content is unrestricted | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is not mandated |
| SMAJ150AHE3_A/H | Unidirectional variant with cathode band marking; VF = 3.5 V at 25 A forward current | Requires polarity-aware PCB layout; unsuitable for AC-coupled or floating signal lines | Choose only for DC-biased rails where reverse conduction must be blocked |
Compared with SMAJ150CAHM3_A/H, the HE3 variant trades halogen-free compliance for lower cost in commercial applications, while the unidirectional SMAJ150AHE3_A/H introduces polarity dependency and forward voltage drop-neither offers pin-compatible replacement without layout or system-level validation.
Availability
SMAJ150CAHM3_A/H is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interfaces, on-board charger front-ends, and motor drive gate driver protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ150CAHM3_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 diodes, rectifiers, and protection devices with emphasis on automotive and industrial reliability.
The SMAJ series targets high-energy transient suppression in harsh environments, engineered specifically for AEC-Q101 compliance, thermal stability, and repeatable clamping performance under real-world surge conditions.
FAQ
What does the "HM3" suffix indicate in SMAJ150CAHM3_A/H?
The HM3 suffix in SMAJ150CAHM3_A/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive material standards, including JESD201 Class 2 whisker resistance and MSL Level 1 reflow capability. SMAJ150CAHM3_A/H is certified for use in under-hood and safety-critical vehicle subsystems where halogen content and long-term reliability are mandated.
Is SMAJ150CAHM3_A/H suitable for protecting CAN FD bus lines?
SMAJ150CAHM3_A/H is not optimized for CAN FD bus protection due to its high clamping voltage (243 V) and relatively high junction capacitance (>50 pF), which would distort high-speed differential signals. For CAN FD, lower-voltage, low-capacitance TVS devices such as the Vishay VCAN26xx series are recommended. SMAJ150CAHM3_A/H is intended for power rail and high-energy signal line protection-not data buses.
Does SMAJ150CAHM3_A/H have polarity markings on the package?
No, SMAJ150CAHM3_A/H has no polarity markings because it is a bidirectional TVS diode. Unlike unidirectional variants (e.g., SMAJ150A), the CA version uses a symmetrical junction structure and is marked only with the device code "VM" per Vishay's standard SMAJ5.0A–SMAJ188CA marking table. This absence of cathode band simplifies layout for AC-coupled or floating circuits.
What is the maximum peak pulse current (IPPM) for SMAJ150CAHM3_A/H?
The maximum peak pulse current (IPPM) for SMAJ150CAHM3_A/H is 1.2 A under the standard 10/1000 μs waveform, derived from its 400 W peak pulse power rating and 243 V clamping voltage (IPPM = PPPM/VC). This value assumes mounting on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per Vishay's test condition; actual current handling decreases with smaller pad areas or elevated ambient temperatures.
How does the thermal resistance of SMAJ150CAHM3_A/H affect PCB layout?
SMAJ150CAHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W, meaning each watt of dissipated power raises junction temperature by 120 °C above ambient. To maintain TJ ≤ 150 °C at 3.3 W steady-state power, ambient must stay below 111 °C-or more realistically, layout must use ≥5 mm × 5 mm copper pads per terminal and consider airflow or thermal vias. This directly informs minimum copper area and heatsinking strategy in automotive PCB designs.
SMAJ150CAHM3_A/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AC, SMA
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 150V
- Voltage - Breakdown (Min):
- 167V
- Voltage - Clamping (Max) @ Ipp:
- 243V
- Current - Peak Pulse (10/1000µs):
- 1.2A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ150CAHM3_A/H FAQ
1.How can I place an order for SMAJ150CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAHM3_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 SMAJ150CAHM3_A/H reliable?
The price and inventory of SMAJ150CAHM3_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 SMAJ150CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ150CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAHM3_A/H?
SMAJ150CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAHM3_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 SMAJ150CAHM3_A/H?
For technical support, including SMAJ150CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ150CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAHM3_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 SMAJ150CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ150CAHM3_A/H?
All SMAJ150CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAHM3_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 SMAJ150CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ150CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ150CAHM3_A/H Tags
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