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Vishay General Semiconductor - Diodes Division SMAJ150CAHM3/H
- Part No.:
- SMAJ150CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ150CAHM3/H.pdf
- Description:
- TVS DIODE 150VWM 243VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,625
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Product details
Overview
SMAJ150CAHM3/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 on power and signal lines. 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 (10/1000 μs waveform) - suitable for protecting automotive sensor interfaces and industrial I/O circuits against ESD and load-switching surges.
For engineers reviewing the SMAJ150CAHM3/H datasheet, SMAJ150CAHM3/H pinout, SMAJ150CAHM3/H application, or SMAJ150CAHM3/H equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on PCBs requiring robust transient immunity up to 150 °C junction temperature.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling use across AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable leakage (<1.0 μA at VWM) and fast response time (<1.0 ps), while the low incremental surge resistance supports effective energy diversion during 8.3 ms surge events.
The SMAJ150CAHM3/H is rated for 40 A peak forward surge current (IFSM) and exhibits a thermal resistance of 120 °C/W (junction-to-ambient) on standard 0.2" × 0.2" copper pads. Its MSL Level 1 rating (JEDEC J-STD-020) and matte tin-plated leads ensure reliability in reflow-soldered automotive and industrial assemblies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 150 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 12 V–48 V DC systems. |
| VBR (min/max) | 167 V / 185 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events above system rail. |
| VC @ IPPM | 243 V at 1.2 A - Clamped voltage under 10/1000 μs surge; limits downstream IC stress to survivable levels. |
| PPPM | 400 W (≤78 V), 300 W (>78 V) - Peak pulse power handling per JEDEC standard; determines transient energy absorption capacity. |
| ID @ VWM | ≤1.0 μA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ max. | +150 °C - Maximum junction temperature enabling operation in under-hood automotive and industrial environments. |
| Package | SMA (DO-214AC) - Surface-mount outline with 5.28 mm × 4.50 mm footprint; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Package: SMA (DO-214AC), 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 (positive half-cycle) | Conducts during positive overvoltage excursions; forms symmetrical path with cathode for bidirectional clamping. |
| Cathode | Transient current entry (negative half-cycle) | Conducts during negative overvoltage excursions; enables full-wave protection without external polarity management. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity testing, and mechanical shock per JESD22 standards. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets environmental compliance requirements for Tier-1 automotive supply chains and industrial green procurement policies. |
| 400 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive switching (e.g., solenoid drivers, relay coils) without degradation. |
| MSL Level 1, 260 °C peak reflow | Supports single-pass lead-free reflow assembly without moisture-induced damage or delamination. |
| Low clamping ratio (VC/VBR ≈ 1.46) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs and ICs. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor inputs (e.g., pressure, temperature) from battery dump and load-dump transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector interface to shunt surge energy before it reaches sensitive analog front-ends or communication ICs. Use Value: Enables compliance with ISO 7637-2 Pulse 5a (load dump) and ISO 16750-2 requirements while maintaining signal fidelity below 1 μA leakage. |
Use Scenario: Safeguarding digital input modules in programmable logic controllers exposed to 24 V DC field wiring with inductive load switching noise. IC Role / Device Role / Timing Role: Standoff clamping device mounted adjacent to terminal block to suppress repetitive 100 V–200 V spikes induced by contactor bounce or motor drive switching. Use Value: Extends mean time between failures (MTBF) of input optocouplers by limiting transient voltage to ≤243 V, well below 300 V isolation barrier ratings. |
| Telecom Power Rail Protection | Consumer Appliance Motor Control |
|
Use Scenario: Guarding 48 V PoE-powered Ethernet switch ports and base station RF front-end bias rails against lightning-induced surges and hot-swap transients. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary MOVs to provide precise, low-leakage clamping for sensitive DC-DC converters and RF amplifiers. Use Value: Delivers <1.0 μA leakage at 48 V nominal, preventing quiescent current drift in precision bias networks while clamping to 243 V. |
Use Scenario: Shielding microcontroller GPIOs and H-bridge gate drivers in smart washing machines and HVAC blower modules from commutation spikes generated by universal motors. IC Role / Device Role / Timing Role: Localized transient suppressor mounted at motor driver IC output pins to prevent false triggering and gate oxide failure during brush arcing. Use Value: Withstands 40 A non-repetitive surge (IFSM) and maintains clamping performance after repeated 10/1000 μs pulses per IEC 61000-4-5. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ150CAHE3/H | RoHS-compliant but not halogen-free; same electrical specs and AEC-Q101 qualification. | Acceptable where halogen-free material is not mandated (e.g., non-automotive industrial designs). | Select SMAJ150CAHE3/H when cost sensitivity outweighs halogen-free requirement and AEC-Q101 remains essential. |
| SMBJ150CAHM3 | Same VWM/VBR/VC specs but in larger SMB (DO-214AA) package; higher thermal mass (RθJA = 90 °C/W vs. 120 °C/W). | Better suited for higher average power dissipation scenarios where board space allows larger footprint. | Choose SMBJ150CAHM3 only if layout permits 5.28 mm × 4.50 mm → 6.22 mm × 4.50 mm footprint increase and improved thermal derating is needed. |
Compared with SMAJ150CAHE3/H, the SMAJ150CAHM3/H adds halogen-free compliance without sacrificing AEC-Q101 qualification or clamping performance; versus SMBJ150CAHM3, it trades thermal margin for compactness - making SMAJ150CAHM3/H optimal for space-constrained automotive modules requiring full environmental compliance.
Availability
SMAJ150CAHM3/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom power rails, and consumer appliance motor control circuits requiring stable component supply with guaranteed long-term continuity.
Supply support for SMAJ150CAHM3/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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series was engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMAJ150CAHM3/H at its rated peak pulse current?
The SMAJ150CAHM3/H has a maximum clamping voltage (VC) of 243 V at 1.2 A peak pulse current (IPPM) under the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and ensures predictable overvoltage limiting for protected circuitry. The clamping occurs rapidly due to the device's avalanche structure, and VC remains stable across its operational temperature range of –55 °C to +150 °C. Designers should verify that downstream components tolerate this clamped level with appropriate safety margin.
Is SMAJ150CAHM3/H qualified for automotive applications?
Yes, SMAJ150CAHM3/H is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in datasheet 88390. This qualification covers stress tests including temperature cycling, highly accelerated life testing (HALT), and mechanical shock - validating suitability for under-hood and cabin ECU applications. The device meets automotive-grade requirements for surge immunity, long-term reliability, and process consistency, making SMAJ150CAHM3/H appropriate for use in ADAS sensors, body control modules, and infotainment power supplies.
How does the HM3 suffix differ from the HE3 suffix in SMAJ150CA variants?
The HM3 suffix denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas HE3 indicates RoHS-compliant and AEC-Q101-qualified but not halogen-free. Both share identical electrical characteristics (VWM = 150 V, VBR = 167–185 V, VC = 243 V), thermal ratings, and packaging. The HM3 variant uses bromine- and chlorine-free molding compounds to meet stricter environmental mandates in Tier-1 automotive supply chains and EU green directives - with no trade-off in performance or reliability compared to HE3.
What is the maximum reverse leakage current for SMAJ150CAHM3/H at its standoff voltage?
The maximum reverse leakage current (ID) for SMAJ150CAHM3/H is 1.0 μA at its 150 V standoff voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and reduces standby power loss in always-on circuits. Leakage remains below 5 μA up to +85 °C and is fully characterized across the –55 °C to +150 °C operating junction temperature range, supporting stable performance in thermally demanding applications like engine control units.
Can SMAJ150CAHM3/H be used in bidirectional AC signal lines?
Yes, SMAJ150CAHM3/H is explicitly designed for bidirectional use, as indicated by the "CA" suffix and confirmed in Vishay's datasheet: electrical characteristics apply identically in both directions. Its symmetrical avalanche structure enables clamping of positive and negative transients without polarity constraints - ideal for protecting differential pairs, AC-coupled audio paths, or isolated RS-485/RS-422 buses. No external orientation or additional components are required, simplifying layout and reducing BOM count compared to unidirectional TVS solutions.
SMAJ150CAHM3/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:
- 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/H FAQ
1.How can I place an order for SMAJ150CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ150CAHM3/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/H reliable?
The price and inventory of SMAJ150CAHM3/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/H is usually 5 days.
3.What payment methods are accepted for SMAJ150CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ150CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ150CAHM3/H?
SMAJ150CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ150CAHM3/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/H?
For technical support, including SMAJ150CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ150CAHM3/H requirements.
6.How does Aetrix verify that SMAJ150CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMAJ150CAHM3/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/H meets industry standards.
7.What is the process for return or replacement of SMAJ150CAHM3/H?
All SMAJ150CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ150CAHM3/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/H part is unused and in its original packaging.
Return procedure for SMAJ150CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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