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Vishay General Semiconductor - Diodes Division SMAJ150AHM3_A/I
- Part No.:
- SMAJ150AHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150AHM3_A/I.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ150AHM3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for clamping high-energy transients on power and signal lines. It features a 150 V stand-off voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current, and 400 W peak pulse power (10/1000 μs waveform), targeting protection of MOSFETs, ICs, and sensor interfaces in automotive and industrial systems.
For engineers reviewing the SMAJ150AHM3_A/I datasheet, SMAJ150AHM3_A/I pinout, SMAJ150AHM3_A/I application, or SMAJ150AHM3_A/I equivalent, key selection criteria include its AEC-Q101 qualification, halogen-free RoHS-compliant construction (HM3 suffix), low thermal resistance (RθJL = 30 °C/W), and verified clamping performance under repetitive surge conditions up to 150 °C junction temperature.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging a glass-passivated silicon junction to deliver sub-nanosecond response to voltage transients. Its design centers on low incremental surge resistance and stable clamping across temperature - with VBR temperature coefficient of +0.108 %/°C and derated peak power above 25 °C per Fig. 2.
Rated for 40 A non-repetitive forward surge (8.3 ms half-sine), it supports robust protection in DC power rails and low-speed signal paths where fast overvoltage events occur due to inductive switching or ESD coupling. The SMA package enables automated placement while meeting MSL Level 1 (260 °C reflow peak) and JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold |
| VBR (min/max) | 167 V / 185 V at IT = 1 mA - Confirmed breakdown range ensures reliable turn-on during overvoltage events without premature conduction |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage under full-rated 10/1000 μs surge; determines protected circuit's maximum stress level |
| PPPM | 400 W (≤78 V); 300 W (>78 V) - Peak pulse power handling capability directly limits survivable transient energy per event |
| IFSM | 40 A - Single half-sine surge rating (8.3 ms) validates robustness against motor-switching or relay-bounce induced surges |
| TJ max | +150 °C - Maximum junction temperature enables operation in under-hood automotive or high-ambient industrial environments |
| RθJL | 30 °C/W - Low junction-to-lead thermal resistance supports effective heat dissipation through PCB copper pads without heatsink |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD22-B102. Cathode indicated by band marking on unidirectional devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward current entry (unidirectional) | Connected to lower-potential side of protected line; enables conduction only when cathode is > anode by ≥VBR |
| Cathode | Reverse-biased terminal (marked with band) | Connected to higher-potential rail (e.g., VCC or signal line); clamps transients by shunting surge current to ground or return path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, body electronics, and ADAS modules |
| Halogen-free & RoHS-compliant (HM3) | Meets automotive environmental standards and end-of-life disposal requirements without compromising electrical performance or thermal stability |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from load dump or inductive kickback in 12 V/24 V systems without degradation over rated lifetime |
| Low RθJL = 30 °C/W | Enables efficient thermal transfer to PCB copper pads, reducing need for oversized traces or thermal vias in space-constrained layouts |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture-related delamination or popcorn failure during assembly |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units (ECUs) and body control modules (BCMs) against ISO 7637-2 Pulse 1, 2a, and 5a transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery rail and LDO/regulator input to limit voltage excursions during load dump or alternator ripple. Use Value: Maintains system uptime by preventing latch-up or destruction of downstream PMICs and microcontrollers during 100 V/100 ms load dump events. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (CAN, LIN) of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Point-of-entry TVS on sensor cable interface to absorb ESD (IEC 61000-4-2 ±8 kV contact) and fast transient bursts (IEC 61000-4-4 ±2 kV). Use Value: Preserves measurement integrity and prevents false triggers by limiting coupled noise to <243 V at 1.2 A, well below sensor IC damage thresholds. |
| DC Motor Drive Board Protection | Telecom Power Supply Input |
|
Use Scenario: Shielding gate drivers and logic-level MOSFETs in brushed DC motor controllers from flyback voltage spikes during PWM commutation. IC Role / Device Role / Timing Role: Parallel-mounted TVS across motor terminals or H-bridge supply rails to clamp inductive kickback (L·di/dt) within safe VDS margins. Use Value: Extends MOSFET lifetime by suppressing voltage overshoot beyond 243 V, avoiding avalanche-induced wear-out during repeated switching cycles. |
Use Scenario: Front-end surge suppression in AC/DC power supplies for base station radios and optical network terminals exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Secondary-stage TVS after MOV/GDT primary protection, providing precise clamping and fast response for residual transients. Use Value: Enables compliance with ITU-T K.20/K.44 immunity requirements by limiting let-through voltage to ≤243 V under 10/1000 μs 1 kA test waveforms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150AHE3_A/I | Same electrical specs but RoHS-compliant commercial grade (E3), not halogen-free or AEC-Q101 qualified | Lacks automotive qualification and halogen-free certification; suitable for consumer/industrial non-automotive use | Select SMAJ150AHE3_A/I only if AEC-Q101 and halogen-free requirements are not mandated |
| SMAJ150A-M3/5A | Identical electrical and thermal specs; differs only in packaging format (13" reel, 7500 pcs) and base P/N suffix | No functional difference; same HM3 material composition and AEC-Q101 qualification | SMAJ150A-M3/5A is a packaging variant - choose based on volume procurement needs, not performance trade-offs |
Compared with SMAJ150AHM3_A/I, the SMAJ150AHE3_A/I alternative omits automotive qualification and halogen-free compliance, while SMAJ150A-M3/5A offers identical performance in a different reel configuration - making the original HM3_A/I variant optimal for AEC-Q101–required automotive designs with strict material compliance mandates.
Availability
SMAJ150AHM3_A/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, DC motor drives, and telecom power supplies requiring stable component supply with guaranteed AEC-Q101 qualification and halogen-free compliance.
Supply support for SMAJ150AHM3_A/I 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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was developed specifically for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - balancing high pulse power, tight VBR tolerance, and robust thermal performance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMAJ150AHM3_A/I at its rated peak pulse current?
The SMAJ150AHM3_A/I has a maximum clamping voltage (VC) of 243 V at its rated peak pulse current of 1.2 A (10/1000 μs waveform). This value is measured under standardized surge conditions and defines the upper voltage limit imposed on protected circuitry during transient events. It is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390 and applies across the full operating temperature range.
Is SMAJ150AHM3_A/I qualified for automotive applications?
Yes, SMAJ150AHM3_A/I is AEC-Q101 qualified, as explicitly stated in the "MECHANICAL DATA" section and noted in the ordering information table (footnote 1). This qualification covers stress tests including temperature cycling, high-temperature reverse bias (HTRB), and surge endurance - validating its suitability for under-hood and chassis-mounted automotive electronics where reliability under harsh thermal and electrical conditions is mandatory.
What does the 'HM3' suffix indicate in SMAJ150AHM3_A/I?
The 'HM3' suffix in SMAJ150AHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's documentation, HM3 parts meet JESD201 Class 2 whisker resistance, UL 94 V-0 flammability rating, and are manufactured using halogen-free molding compounds - distinguishing them from E3 (RoHS only) and HE3 (AEC-Q101 but not halogen-free) variants.
How does SMAJ150AHM3_A/I differ from SMAJ150A-M3/5A?
SMAJ150AHM3_A/I and SMAJ150A-M3/5A share identical electrical specifications, thermal characteristics, AEC-Q101 qualification, and halogen-free (HM3) material composition. The sole difference is packaging: SMAJ150AHM3_A/I uses a 7" reel (1800 pcs) with I-type carrier tape, while SMAJ150A-M3/5A uses a 13" reel (7500 pcs) with 5A tape. Both are functionally interchangeable in design and assembly.
What is the maximum junction temperature rating for SMAJ150AHM3_A/I?
The maximum junction temperature (TJ) for SMAJ150AHM3_A/I is +150 °C, as specified in the "MAXIMUM RATINGS" table. This rating enables reliable operation in high-ambient environments such as automotive engine compartments or industrial enclosures. Derating curves in Figure 2 of the datasheet define allowable pulse power reduction above 25 °C ambient to maintain this TJ limit.
SMAJ150AHM3_A/I 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ150AHM3_A/I FAQ
1.How can I place an order for SMAJ150AHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150AHM3_A/I 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 SMAJ150AHM3_A/I reliable?
The price and inventory of SMAJ150AHM3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ150AHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ150AHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150AHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150AHM3_A/I?
SMAJ150AHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150AHM3_A/I 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 SMAJ150AHM3_A/I?
For technical support, including SMAJ150AHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150AHM3_A/I requirements.
6.How does Aetrix verify that SMAJ150AHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ150AHM3_A/I 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 SMAJ150AHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ150AHM3_A/I?
All SMAJ150AHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150AHM3_A/I, 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 SMAJ150AHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ150AHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ150AHM3_A/I Tags
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