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Vishay General Semiconductor - Diodes Division SMAJ150CAHM3_A/I
- Part No.:
- SMAJ150CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAHM3_A/I.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ150CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMA (DO-214AC) package, designed for robust overvoltage protection of sensitive electronics. It features a 150 V standoff voltage (VWM), 167–185 V breakdown voltage (VBR) at 1 mA, 243 V maximum clamping voltage (VC) at 1.2 A peak pulse current (IPPM), and 400 W peak pulse power rating with 10/1000 μs waveform - deployed on power rails and signal lines in automotive ECUs and industrial sensor interfaces.
For engineers reviewing the SMAJ150CAHM3_A/I datasheet, SMAJ150CAHM3_A/I pinout, SMAJ150CAHM3_A/I application, or SMAJ150CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification (HM3 suffix), halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This device operates as a voltage-clamped shunt protector: during transients exceeding VWM (150 V), it avalanches to limit voltage across protected circuitry to ≤243 V. Its bidirectional symmetry enables use without polarity concern on AC-coupled or differential lines. The glass-passivated junction ensures stable breakdown and low leakage (<1.0 μA at VWM).
Thermally, it relies on PCB copper pads (0.2" × 0.2") for heat dissipation, with RθJL = 30 °C/W to leads and RθJA = 120 °C/W to ambient. Derating applies above TA = 25 °C per Fig. 2; peak surge current drops to ~1.09 A at TJ = 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC RMS working range. |
| VBR min/max | 167 V / 185 V at IT = 1 mA - Confirmed breakdown threshold window; ensures predictable turn-on margin above VWM. |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage during 10/1000 μs transient; determines maximum stress on downstream ICs. |
| PPPM | 400 W - Peak pulse power handling with 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at rated standoff; negligible loading on high-impedance sensor or communication lines. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Surface-mount, low-profile package compatible with automated assembly and IPC-7351B land patterns. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL level 1 (JEDEC J-STD-020), 260 °C reflow peak. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals serve identical roles; bidirectional clamping occurs regardless of voltage polarity applied across them. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for engine control, ADAS, and body electronics. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-20E; eliminates brominated flame retardants for safer end-of-life processing. |
| 400 W peak pulse power (10/1000 μs) | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when properly mounted. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage overshoot during fast transients - critical for protecting 3.3 V or 5 V logic interfaces downstream. |
| Fast response time (<1 ps) | Clamps within picoseconds of transient onset - faster than MOVs or GDTs - preserving signal integrity on high-speed lines. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Line Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-supplied microcontrollers and CAN transceivers from load dump and alternator ripple. IC Role / Device Role / Timing Role: Shunt TVS placed between VBAT and GND, clamping transients before they reach LDO inputs or MCU VDD pins. Use Value: Withstands 400 W surges while limiting clamped voltage to 243 V - sufficient headroom below typical 36 V automotive system max ratings. |
Use Scenario: Safeguarding analog outputs (e.g., 4–20 mA current loops) and digital I/O (e.g., RS-485) in factory automation sensors. IC Role / Device Role / Timing Role: Bidirectional clamp across differential pair or single-ended line, suppressing ESD and inductive switching noise. Use Value: Sub-1 μA leakage preserves loop accuracy; 243 V VC ensures connected PLC inputs remain within absolute maximum ratings during 2 kV EFT bursts. |
| Telecom Interface Surge Suppression | Consumer Device USB/Power Port Protection |
|
Use Scenario: Front-end protection for Ethernet PHYs, PoE injectors, and DSL line drivers exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary-level TVS on transformer-coupled lines or DC bias rails, coordinated with secondary GDT or polymer PTC. Use Value: 400 W rating handles multi-pulse surge events per IEC 61000-4-5; bidirectional symmetry avoids polarity misalignment on AC-coupled data paths. |
Use Scenario: Overvoltage safeguard on USB-C VBUS and legacy 5 V adapter inputs in smart speakers, set-top boxes, and portable monitors. IC Role / Device Role / Timing Role: Standoff-rated clamp between input power rail and system PMIC, triggered only during fault conditions. Use Value: 150 V VWM prevents false triggering from normal 5–20 V input variations; 243 V VC protects downstream buck converters rated to 28 V absolute max. |
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/I | Same electrical specs, but RoHS-compliant without halogen-free certification; lacks JESD201 Class 2 whisker resistance. | Approved for commercial/industrial use; not AEC-Q101 qualified - unsuitable for automotive under-hood deployment. | Select when halogen-free requirement is waived and automotive qualification is unnecessary. |
| SMBJ150CAHM3_A/I | Same VWM/VBR/VC, but SMB (DO-214AA) package: 40 % larger footprint, 20 % higher RθJA (145 °C/W), 600 W PPPM rating. | Better thermal margin for high-duty-cycle surges; requires larger PCB area and different land pattern. | Choose when higher pulse power headroom or improved thermal performance justifies larger board space. |
Compared with SMAJ150CAHM3_A/I, the HE3 variant trades halogen-free compliance and automotive qualification for lower cost in non-automotive settings, while the SMBJ150CAHM3_A/I offers greater surge resilience at the expense of footprint and thermal resistance - enabling design flexibility based on space, reliability, and surge profile requirements.
Availability
SMAJ150CAHM3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom infrastructure equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ150CAHM3_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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where robustness against ESD, EFT, and surge events is mission-critical.
FAQ
What is the clamping voltage of SMAJ150CAHM3_A/I at its rated peak pulse current?
The SMAJ150CAHM3_A/I has a maximum clamping voltage (VC) of 243 V at 1.2 A peak pulse current (IPPM), measured with a 10/1000 μs waveform. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is confirmed in the Vishay datasheet Document Number 88390, page 2. The SMAJ150CAHM3_A/I maintains this clamping performance across its qualified temperature range (−55 °C to +150 °C).
Is SMAJ150CAHM3_A/I suitable for automotive applications?
Yes, SMAJ150CAHM3_A/I is AEC-Q101 qualified (denoted by the HM3 suffix) and specifically designed for automotive use, including engine control modules, body electronics, and ADAS sensors. Its halogen-free, RoHS-compliant construction, MSL level 1 rating, and validated performance across −55 °C to +150 °C junction temperature meet stringent automotive reliability requirements. The SMAJ150CAHM3_A/I is listed in Vishay's AEC-Q101 qualified product table with full test report traceability.
How does the bidirectional configuration of SMAJ150CAHM3_A/I affect its circuit implementation?
The bidirectional configuration of SMAJ150CAHM3_A/I means it provides symmetrical clamping for both positive and negative voltage transients - eliminating the need for polarity awareness during placement. Unlike unidirectional TVS diodes, SMAJ150CAHM3_A/I has no cathode band marking and functions identically regardless of orientation across a differential line or AC-coupled node. This simplifies layout and reduces BOM count in applications like RS-485, CAN FD, or Ethernet PHY protection.
What is the thermal resistance of SMAJ150CAHM3_A/I, and how does it impact PCB layout?
SMAJ150CAHM3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. To maintain safe junction temperatures during repetitive surges, designers must adhere to this pad layout - reducing copper area increases RθJA and risks thermal runaway. The SMAJ150CAHM3_A/I also exhibits RθJL = 30 °C/W to leads, supporting efficient heat transfer through solder joints into internal ground/power planes.
Does SMAJ150CAHM3_A/I require derating at elevated ambient temperatures?
Yes, SMAJ150CAHM3_A/I requires derating above TA = 25 °C, as shown in Figure 2 of the Vishay datasheet (Document Number 88390). Its peak pulse power (PPPM) and peak pulse current (IPPM) decrease linearly with rising ambient temperature - for example, at TA = 85 °C, PPPM drops to approximately 260 W. Designers must apply this derating curve when sizing protection for high-temperature enclosures or under-hood automotive locations to ensure the SMAJ150CAHM3_A/I remains within safe operating limits.
SMAJ150CAHM3_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:
- -
- 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/I FAQ
1.How can I place an order for SMAJ150CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAHM3_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 SMAJ150CAHM3_A/I reliable?
The price and inventory of SMAJ150CAHM3_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 SMAJ150CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ150CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAHM3_A/I?
SMAJ150CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAHM3_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 SMAJ150CAHM3_A/I?
For technical support, including SMAJ150CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ150CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAHM3_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 SMAJ150CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ150CAHM3_A/I?
All SMAJ150CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAHM3_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 SMAJ150CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ150CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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