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Vishay General Semiconductor - Diodes Division SMAJ14CAHM3/I
- Part No.:
- SMAJ14CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHM3/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,704
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Product details
Overview
SMAJ14CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for clamping inductive switching transients and ESD events on power and signal lines. It features a 14 V standoff voltage (VWM), 23.2 V maximum clamping voltage (VC) at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - suitable for protecting MOSFET gates, sensor interfaces, and automotive control modules.
For engineers reviewing the SMAJ14CAHM3/I datasheet, SMAJ14CAHM3/I pinout, SMAJ14CAHM3/I application, or SMAJ14CAHM3/I equivalent, this device is evaluated for robust overvoltage protection in space-constrained PCB layouts requiring AEC-Q101-qualified, halogen-free, RoHS-compliant components with MSL Level 1 reflow compatibility.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with breakdown voltage (VBR) specified between 15.6 V (min) and 17.2 V (max) at 1 mA test current. Its low clamping ratio (VC/VWM ≈ 1.66) ensures effective voltage limiting during fast transients while maintaining low incremental surge resistance.
Thermally, it exhibits RθJA = 120 °C/W (typ.) and RθJL = 30 °C/W (typ.), enabling reliable operation up to TJ = +150 °C. The device is rated for 40 A non-repetitive forward surge current (IFSM) and meets JESD201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Ensures consistent breakdown onset across production units |
| VC @ IPPM | 23.2 V at 17.2 A - Limits transient voltage to safe levels for downstream 15–20 V logic or power stages |
| PPPM | 400 W (10/1000 μs) - Handles high-energy surges common in automotive load-dump and inductive kick scenarios |
| IFSM | 40 A (8.3 ms half-sine) - Withstands repetitive motor-switching surges without degradation |
| TJ max. | +150 °C - Supports under-hood automotive and industrial ambient temperature requirements |
| Package | SMA (DO-214AC) - Low-profile 2-pin SMD footprint (4.93 mm × 3.99 mm) compatible with automated placement |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, bidirectional configuration with no polarity marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | Conducts during negative-going transients; symmetrical with cathode in bidirectional mode |
| Cathode | Transient current entry (positive polarity) | Conducts during positive-going transients; identical electrical behavior to anode due to CA symmetry |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Halogen-free & RoHS-compliant (HM3 suffix) | Meets EU Directive 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity level |
| 400 W peak pulse power (10/1000 μs) | Provides higher surge margin than standard 300 W TVS devices below 78 V, improving system-level EMC robustness |
| Low clamping voltage (23.2 V) | Protects 15 V-rated ICs and MOSFETs without requiring additional series impedance or derating |
| MSL Level 1 (260 °C peak) | Enables single-pass lead-free reflow without pre-baking or special handling |
Applications
| Automotive Body Control Module | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Protecting LIN bus transceivers and relay driver outputs from load-dump and inductive kickback in door module ECUs. IC Role / Device Role / Timing Role: Bidirectional clamping element placed directly across power input and signal pins of protected ICs. Use Value: Prevents latch-up and gate oxide damage in 12 V systems by limiting transients to ≤23.2 V within nanoseconds. | Use Scenario: Safeguarding analog front-end inputs of pressure/temperature sensors exposed to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF) shunt protector on differential or single-ended sensor lines. Use Value: Maintains signal integrity while suppressing ±8 kV contact ESD per IEC 61000-4-2 without adding propagation delay. |
| Consumer Power Adapter Input Stage | Telecom PoE Interface Protection |
Use Scenario: Secondary-side overvoltage suppression on 12–19 V DC outputs of wall adapters subject to lightning-induced surges. IC Role / Device Role / Timing Role: Final-stage clamp after primary-side isolation, absorbing residual energy not filtered by bulk capacitance. Use Value: Limits output overshoot to <25 V during 10/1000 μs surges, preventing damage to connected USB-C or legacy DC devices. | Use Scenario: Data line protection on IEEE 802.3af/at PoE injectors/splitters where Ethernet pairs carry both power and signals. IC Role / Device Role / Timing Role: Symmetrical bidirectional clamp on each twisted pair, referenced to common-mode ground. Use Value: Clamps common-mode transients to ≤23.2 V without disrupting 100BASE-TX signaling integrity or violating PoE voltage margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CAHE3/I | Same electrical specs; RoHS-compliant but not halogen-free; AEC-Q101 qualified | Acceptable for automotive use where halogen content is unrestricted | Select when cost optimization is prioritized over halogen-free compliance |
| SMBJ14CAHM3/I | Same VWM/VC, but SMB package (DO-214AA); 600 W PPPM rating | Better suited for higher-energy surge environments (e.g., industrial mains-connected equipment) | Choose when board layout allows larger footprint and higher surge immunity is required |
Compared with SMAJ14CAHM3/I, SMAJ14CAHE3/I offers identical automotive qualification without halogen-free assurance, while SMBJ14CAHM3/I delivers 50 % higher surge power in a physically larger package - enabling trade-offs between PCB area, environmental compliance, and transient energy handling.
Availability
SMAJ14CAHM3/I is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, and telecom PoE protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ14CAHM3/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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific performance.
The SMAJ series is engineered for high-reliability transient suppression in harsh environments - targeting automotive, industrial, and communications systems where compact size, AEC-Q101 validation, and repeatable clamping behavior are critical.
FAQ
What is the clamping voltage of SMAJ14CAHM3/I at its rated peak pulse current?
The SMAJ14CAHM3/I has a maximum clamping voltage (VC) of 23.2 V at its rated peak pulse current (IPPM) of 17.2 A, measured using the standardized 10/1000 μs double-exponential waveform. This value is guaranteed across the full operating temperature range and ensures predictable overvoltage limiting for downstream 15 V-rated components. The SMAJ14CAHM3/I maintains this clamping performance with minimal variation due to its tightly controlled silicon junction characteristics.
Is SMAJ14CAHM3/I suitable for automotive applications?
Yes, SMAJ14CAHM3/I is AEC-Q101 qualified and specifically designed for automotive use, with validation across temperature cycling, high-temperature reverse bias, and ESD stress tests. Its halogen-free (HM3) and RoHS-compliant construction meets stringent automotive material requirements, and its SMA package supports automated assembly in engine control units, lighting modules, and ADAS sensor nodes. The SMAJ14CAHM3/I is rated for operation from –55 °C to +150 °C junction temperature.
How does the bidirectional design of SMAJ14CAHM3/I affect its circuit placement?
The bidirectional design of SMAJ14CAHM3/I eliminates polarity concerns during placement - it functions identically regardless of orientation across the protected line, simplifying layout and reducing assembly errors. Unlike unidirectional TVS diodes, SMAJ14CAHM3/I requires no cathode band alignment and provides symmetrical clamping for both positive and negative transients. This makes SMAJ14CAHM3/I ideal for AC-coupled signal lines, transformer-isolated interfaces, and floating power rails where voltage polarity reversal may occur.
What is the thermal resistance of SMAJ14CAHM3/I, and how does it impact PCB layout?
SMAJ14CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 120 °C/W and junction-to-lead resistance (RθJL) of 30 °C/W. To maintain safe operating temperatures under repeated surge conditions, PCB layout must provide minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Vishay datasheet. Adequate copper area directly reduces thermal impedance and prevents junction overheating during high-duty-cycle transient events. The SMAJ14CAHM3/I's thermal performance is validated only with this recommended pad layout.
Does SMAJ14CAHM3/I meet industry standards for moisture sensitivity and reflow compatibility?
Yes, SMAJ14CAHM3/I is rated MSL Level 1 per J-STD-020, with a maximum reflow peak temperature of 260 °C - fully compatible with standard lead-free soldering processes without pre-baking. Its matte tin-plated leads comply with J-STD-002 and JESD22-B102 for solderability, and the molding compound meets UL 94 V-0 flammability requirements. These qualifications ensure robust manufacturability in high-volume SMT lines, and the SMAJ14CAHM3/I's MSL Level 1 status eliminates handling restrictions typically associated with moisture-sensitive devices.
SMAJ14CAHM3/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):
- 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/I FAQ
1.How can I place an order for SMAJ14CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHM3/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 SMAJ14CAHM3/I reliable?
The price and inventory of SMAJ14CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHM3/I?
SMAJ14CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHM3/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 SMAJ14CAHM3/I?
For technical support, including SMAJ14CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHM3/I requirements.
6.How does Aetrix verify that SMAJ14CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHM3/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 SMAJ14CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHM3/I?
All SMAJ14CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHM3/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 SMAJ14CAHM3/I part is unused and in its original packaging.
Return procedure for SMAJ14CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ14CAHM3/I Tags
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