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Vishay General Semiconductor - Diodes Division SMAJ14CAHM3_A/H
- Part No.:
- SMAJ14CAHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHM3_A/H.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:3,930
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Product details
Overview
SMAJ14CAHM3_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 on signal and power lines. It features 14 V standoff voltage (VWM), 15.6–17.2 V breakdown voltage (VBR) at 1 mA, 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current (IPPM), and 400 W peak pulse power (10/1000 μs waveform), used to protect MOSFETs, ICs, and sensor signal lines in automotive and industrial electronics.
For engineers reviewing the SMAJ14CAHM3_A/H datasheet, SMAJ14CAHM3_A/H pinout, SMAJ14CAHM3_A/H application, or SMAJ14CAHM3_A/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, clamping performance under surge conditions, thermal resistance data (RθJA = 120 °C/W), and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, with identical VBR min/max (15.6 V / 17.2 V), VC (23.2 V), and IPPM (17.2 A) ratings across reverse and forward directions. Its low incremental surge resistance and fast response time (<1 ns) enable effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The device is rated for 150 °C maximum junction temperature, derated linearly above 25 °C ambient, and meets MSL Level 1 per J-STD-020 with peak reflow temperature of 260 °C. It is halogen-free, RoHS-compliant, and AEC-Q101 qualified - confirmed by ordering suffix HM3 and revision code "A/H".
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 14 V - Maximum continuous reverse working voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 15.6–17.2 V at 1 mA - Voltage at which device transitions from high-impedance to low-impedance clamping state; ensures reliable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 23.2 V at IPPM = 17.2 A - Maximum voltage seen by protected circuit during 10/1000 μs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 400 W (10/1000 μs) - Surge energy handling capacity; sufficient for IEC 61000-4-5 Level 3 (1 kV/2 Ω) and ISO 7637-2 Pulse 1/2a/5a protection. |
| ID (Reverse Leakage) | 1.0 μA at VWM - Low leakage preserves signal integrity and minimizes standby power loss in high-impedance interfaces. |
| TJ max. | 150 °C - Enables operation in under-hood automotive and industrial environments without thermal shutdown. |
| RθJA | 120 °C/W - Thermal resistance from junction to ambient on standard 0.2" × 0.2" copper pads; informs PCB thermal design requirements. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking. Matte tin-plated leads, compliant with J-STD-002 and JESD22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal 1 (cathode band side not applicable) | One side of symmetrical PN junction; functions identically as cathode in reverse bias - no polarity distinction in bidirectional operation. |
| Anode/Cathode (shared) | Terminal 2 (opposite end) | Second terminal of bidirectional structure; enables clamping for both positive and negative transients without external orientation constraints. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - supports use in ADAS, body control, and infotainment modules. |
| Halogen-free & RoHS-compliant (HM3) | Meets JESD201 Class 2 whisker resistance and global environmental regulations - eliminates brominated flame retardants without compromising UL 94 V-0 flammability rating. |
| 400 W peak pulse power (10/1000 μs) | Handles repetitive surge events up to 0.01% duty cycle - suitable for protection against load dump and alternator transients in 12 V systems. |
| Low clamping ratio (VC/VBR ≈ 1.35) | Minimizes overvoltage stress on protected ICs - critical for safeguarding 16 V-tolerant microcontrollers and CAN transceivers. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without pre-baking - reduces manufacturing complexity and cost in high-volume SMT lines. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) and digital sensor interfaces (e.g., LIN, SENT) from load dump and ESD in engine control units. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly at connector entry point to shunt transient energy before reaching precision ADCs or signal conditioners. Use Value: Limits voltage excursion to ≤23.2 V during 17.2 A surge, preventing latch-up or gate oxide damage in downstream op-amps and microcontrollers. |
Use Scenario: Safeguarding digital input channels of programmable logic controllers exposed to inductive kickback from solenoids and contactors in factory automation. IC Role / Device Role / Timing Role: Fast-acting voltage clamp on 24 V DC input terminals, absorbing 10/1000 μs transients induced by relay switching. Use Value: Maintains functional safety integrity by holding line voltage below 24 V system tolerance limits during 400 W surge events. |
| Telecom Interface Protection | Consumer Device USB/UART Lines |
Use Scenario: Shielding RS-485 transceiver pins in base station backhaul equipment from lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Primary transient suppressor mounted adjacent to connector, operating in parallel with GDT or MOV secondary protection stages. Use Value: Responds in <1 ns to clamp differential-mode surges up to ±23.2 V, preserving signal fidelity and preventing receiver saturation. |
Use Scenario: Protecting UART and debug interface pins on smart home hubs and IoT gateways from user-handling ESD (±8 kV contact discharge). IC Role / Device Role / Timing Role: Low-capacitance (typ. 200 pF at 0 V) bidirectional TVS placed inline with TX/RX traces to minimize signal distortion. Use Value: Delivers sub-25 V clamping at 1 A ESD pulse, ensuring UART communication remains uninterrupted after repeated discharges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CAHE3_A/H | Same electrical specs and AEC-Q101 qualification, but RoHS-compliant with brominated flame retardants (non-halogen-free); uses E3 suffix instead of HM3. | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial designs). | Select SMAJ14CAHE3_A/H only if halogen content is unrestricted and cost sensitivity favors standard RoHS over halogen-free compliance. |
| SMBJ14CAHM3_A/H | Same VWM (14 V), VBR (15.6–17.2 V), and VC (23.2 V), but higher PPPM (600 W) and larger SMB (DO-214AA) package (4.58 mm × 3.94 mm vs. SMA's 4.50 mm × 2.79 mm). | Better suited for higher-energy surge environments (e.g., 24 V industrial power rails) where board space allows larger footprint. | Choose SMBJ14CAHM3_A/H when surge energy exceeds 400 W or thermal dissipation demands lower RθJA (80 °C/W typical) than SMAJ14CAHM3_A/H can provide. |
Compared with SMAJ14CAHM3_A/H, SMAJ14CAHE3_A/H offers identical protection performance without halogen-free assurance, while SMBJ14CAHM3_A/H trades compact size for 50% higher surge capacity and improved thermal performance - enabling selection based on space, regulatory, and energy-class constraints.
Availability
SMAJ14CAHM3_A/H is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom RS-485 ports, and consumer IoT debug interfaces requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMAJ14CAHM3_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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific optimization.
The SMAJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where AEC-Q101 qualification, low clamping voltage, and surface-mount manufacturability are essential.
FAQ
What is the clamping voltage of SMAJ14CAHM3_A/H at its rated peak pulse current?
The SMAJ14CAHM3_A/H has a maximum clamping voltage (VC) of 23.2 V at 17.2 A peak pulse current (IPPM), measured using a 10/1000 μs waveform. This value represents the highest voltage imposed on the protected circuit during a standardized surge event and is critical for ensuring downstream ICs remain within their absolute maximum ratings. The SMAJ14CAHM3_A/H maintains this clamping performance consistently across its qualified operating temperature range.
Is SMAJ14CAHM3_A/H qualified for automotive applications?
Yes, SMAJ14CAHM3_A/H is AEC-Q101 qualified, as confirmed by its HM3 suffix and documentation in Vishay's official datasheet (Document Number: 88390). This qualification covers stress tests including high-temperature reverse bias, temperature cycling, and ESD robustness - making SMAJ14CAHM3_A/H suitable for under-hood and cabin applications such as engine control sensors, body electronics, and infotainment interfaces.
How does the halogen-free construction of SMAJ14CAHM3_A/H impact its reliability?
The halogen-free construction of SMAJ14CAHM3_A/H complies with JESD201 Class 2 whisker resistance and eliminates brominated flame retardants while retaining UL 94 V-0 flammability rating. This enhances long-term interconnect reliability in high-humidity or high-temperature environments and aligns with evolving automotive and industrial environmental mandates - without degrading electrical performance or thermal capability compared to non-halogen-free variants like SMAJ14CAHE3_A/H.
What is the thermal resistance of SMAJ14CAHM3_A/H, and how does it affect PCB layout?
SMAJ14CAHM3_A/H 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 minimal copper area; increasing pad size or adding thermal vias reduces RθJA and improves surge survivability. For sustained power dissipation or high-repetition surges, designers should verify junction temperature stays below 150 °C using this RθJA and actual power dissipation estimates.
Can SMAJ14CAHM3_A/H be used in bidirectional signal lines without polarity concerns?
Yes, SMAJ14CAHM3_A/H is explicitly designed for bidirectional use - indicated by the "CA" suffix - and exhibits symmetrical electrical characteristics in both directions. Its VBR, VC, and IPPM values apply identically for positive and negative transients, and it carries no polarity marking on the SMA package. This makes SMAJ14CAHM3_A/H ideal for protecting differential buses (e.g., RS-485, CAN), AC-coupled analog paths, and any signal line subject to bipolar overvoltage events.
SMAJ14CAHM3_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):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 23.2V
- Current - Peak Pulse (10/1000µs):
- 17.2A
- 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)
SMAJ14CAHM3_A/H FAQ
1.How can I place an order for SMAJ14CAHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHM3_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 SMAJ14CAHM3_A/H reliable?
The price and inventory of SMAJ14CAHM3_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 SMAJ14CAHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHM3_A/H?
SMAJ14CAHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHM3_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 SMAJ14CAHM3_A/H?
For technical support, including SMAJ14CAHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHM3_A/H requirements.
6.How does Aetrix verify that SMAJ14CAHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHM3_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 SMAJ14CAHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHM3_A/H?
All SMAJ14CAHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHM3_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 SMAJ14CAHM3_A/H part is unused and in its original packaging.
Return procedure for SMAJ14CAHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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