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Vishay General Semiconductor - Diodes Division SMAJ150CAHM3/I
- Part No.:
- SMAJ150CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAHM3/I.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,379
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Product details
Overview
SMAJ150CAHM3/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 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 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/I datasheet, SMAJ150CAHM3/I pinout, SMAJ150CAHM3/I application, or SMAJ150CAHM3/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and thermal resistance (RθJA = 120 °C/W) under standard PCB pad layout.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding VWM (150 V), it avalanches symmetrically in both directions to clamp voltage at ≤243 V while diverting surge current away from downstream circuitry. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at VWM).
Designed for repetitive surge events at 0.01% duty cycle, it delivers 400 W peak pulse power up to 78 V and 300 W above that threshold - derated linearly with junction temperature per Fig. 2. The device meets UL 497B recognition (QVGQ2) and JESD201 Class 2 whisker resistance.
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 1 mA - guaranteed avalanche onset range defining protection threshold tolerance |
| VC @ IPPM | 243 V at 1.2 A - clamped voltage during full-rated 10/1000 μs surge, limiting stress on protected ICs |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - peak surge energy handling capacity under standardized waveform |
| ID @ VWM | ≤1.0 μA - ultra-low leakage preserves signal integrity and minimizes standby power loss |
| RθJA | 120 °C/W - thermal resistance from junction to ambient on 0.2" × 0.2" copper pads, critical for thermal design margin |
| AEC-Q101 | Qualified - validated for automotive-grade reliability including temperature cycling, HTRB, and ESD |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.50 mm × 2.79 mm × 2.29 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | One terminal of symmetrical PN junction - conducts surge current in either direction when V > VBR |
| Cathode | Transient current sink (bidirectional) | Second terminal of symmetrical PN junction - identical electrical role to Anode; no cathode band marking on CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| AEC-Q101 qualification | Validated for automotive under-hood and body-control module deployments requiring extended temperature and life-cycle reliability |
| Halogen-free & RoHS-compliant (HM3) | Meets global environmental regulations and eliminates corrosive halogen emissions during board reflow or end-of-life processing |
| MSL Level 1 (260 °C peak) | Allows standard SMT reflow without baking, reducing manufacturing complexity and cost |
| 400 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V automotive power nets |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V supply inputs in engine control units (ECUs) against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed upstream of DC/DC converters and microcontrollers. Use Value: Clamps transients to ≤243 V, preventing latch-up or permanent damage to downstream 3.3 V/5 V logic and analog front-ends. | Use Scenario: Safeguarding RS-485/RS-232 communication lines in factory automation PLC I/O modules exposed to EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional voltage clamp across differential pair, referenced to local ground. Use Value: Maintains signal integrity by limiting common-mode transients to <250 V while adding <0.5 pF capacitance at 0 V bias. |
| Consumer Appliance Motor Drive Protection | Telecom Power Entry Protection |
Use Scenario: Suppressing inductive kickback from brushed DC motors in smart home appliances (e.g., HVAC blowers, washing machine pumps). IC Role / Device Role / Timing Role: Parallel-connected TVS across motor terminals or H-bridge outputs. Use Value: Absorbs 400 W surge energy within 1 ms, eliminating need for external snubbers and reducing BOM count. | Use Scenario: Primary-stage surge suppression on -48 V telecom power feeds entering base station equipment cabinets. IC Role / Device Role / Timing Role: First-line defense against lightning-induced surges on DC input before upstream DC/DC isolation stages. Use Value: Withstands repeated 10/1000 μs surges up to 300 W above 78 V, extending system uptime in outdoor deployments. |
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/I | RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance certification | Approved for commercial/industrial use; not qualified for automotive AEC-Q101 | Select when halogen-free requirement or automotive qualification is not mandated |
| SMBJ150CAHM3/I | Same VWM/VBR/VC specs but in SMB (DO-214AA) package - 27% larger footprint, 10% lower RθJA (110 °C/W) | Better thermal performance under high-repetition surges; requires PCB layout change | Choose when higher surge repetition rate or improved thermal margin justifies larger board area |
Compared with SMAJ150CAHM3/I, SMAJ150CAHE3/I omits halogen-free and AEC-Q101 validation, while SMBJ150CAHM3/I trades compact size for enhanced thermal dissipation - guiding selection based on environmental compliance, automotive qualification, and thermal vs. space trade-offs.
Availability
SMAJ150CAHM3/I is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, consumer appliance motor drives, and telecom power entry circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ150CAHM3/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 targets high-reliability transient suppression in space-constrained, high-surge environments - engineered for automotive, industrial, and telecom systems where failure modes must be mitigated without compromising board real estate.
FAQ
What is the clamping voltage of SMAJ150CAHM3/I at its rated peak pulse current?
The SMAJ150CAHM3/I has a maximum clamping voltage (VC) of 243 V at its specified peak pulse current (IPPM) of 1.2 A under the 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the voltage seen by protected circuitry will not exceed 243 V during a full-rated transient event. The SMAJ150CAHM3/I maintains this clamping performance across its qualified operating temperature range of –55 °C to +150 °C.
Is SMAJ150CAHM3/I suitable for automotive applications?
Yes, SMAJ150CAHM3/I is AEC-Q101 qualified and specifically designed for automotive use. Its HM3 suffix denotes halogen-free, RoHS-compliant construction and full qualification to AEC-Q101 stress tests including temperature cycling, high-temperature reverse bias, and ESD. The SMAJ150CAHM3/I is commonly deployed in engine control units, body control modules, and ADAS sensor power supplies where reliability under harsh thermal and electrical conditions is mandatory.
How does the bidirectional configuration of SMAJ150CAHM3/I affect its circuit implementation?
The bidirectional configuration of SMAJ150CAHM3/I means it functions identically in both polarities - no cathode band marking is present, and it clamps transients equally on positive and negative excursions beyond ±167 V. This allows direct placement across AC-coupled lines, floating buses, or differential pairs without orientation concerns. Unlike unidirectional variants, SMAJ150CAHM3/I eliminates the risk of incorrect installation and simplifies layout for symmetric protection schemes.
What is the thermal resistance of SMAJ150CAHM3/I, and how does it impact PCB layout?
SMAJ150CAHM3/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. This value assumes minimum recommended pad layout per Vishay's DO-214AC specification. To maintain safe junction temperatures during repetitive surges, designers must ensure adequate copper area and avoid excessive trace length or thermal bottlenecks - undersized pads will raise RθJA and risk thermal runaway during sustained transient activity. The SMAJ150CAHM3/I datasheet provides derating curves for elevated ambient temperatures.
Does SMAJ150CAHM3/I meet UL safety standards?
Yes, SMAJ150CAHM3/I is Underwriters Laboratory (UL) recognized under file E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for primary protectors. This certification covers its use in telecommunications, industrial control, and automotive systems where regulatory approval for surge protection devices is required. The UL recognition applies specifically to the SMAJ150CAHM3/I variant with HM3 suffix and is documented in Vishay's QVGQ2 classification report.
SMAJ150CAHM3/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:
- Discontinued at Digi-Key
- 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/I FAQ
1.How can I place an order for SMAJ150CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAHM3/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/I reliable?
The price and inventory of SMAJ150CAHM3/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/I is usually 5 days.
3.What payment methods are accepted for SMAJ150CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAHM3/I?
SMAJ150CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAHM3/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/I?
For technical support, including SMAJ150CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAHM3/I requirements.
6.How does Aetrix verify that SMAJ150CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAHM3/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/I meets industry standards.
7.What is the process for return or replacement of SMAJ150CAHM3/I?
All SMAJ150CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAHM3/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/I part is unused and in its original packaging.
Return procedure for SMAJ150CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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