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Vishay General Semiconductor - Diodes Division SMCJ14CAHM3_A/I
- Part No.:
- SMCJ14CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ14CAHM3_A/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,296
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Product details
Overview
SMCJ14CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection of sensitive electronics. It features a 14 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), and clamps transients to ≤23.2 V at 64.7 A (10/1000 μs waveform), making it suitable for automotive sensor signal line protection and industrial I/O interface hardening.
For engineers reviewing the SMCJ14CAHM3_A/I datasheet, SMCJ14CAHM3_A/I pinout, SMCJ14CAHM3_A/I application, or SMCJ14CAHM3_A/I equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, halogen-free RoHS compliance, and compatibility with automated SMT placement on 8 mm × 8 mm copper pads.
Technical Context
The SMCJ14CAHM3_A/I operates as a silicon avalanche diode with symmetrical breakdown in both directions, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable clamping under repetitive surge stress, and its MSL Level 1 rating supports lead-free reflow up to 260 °C.
Thermal performance is defined by RθJA = 75 °C/W and RθJL = 15 °C/W, requiring careful PCB pad design per Vishay's recommended 0.31" × 0.31" (8.0 mm × 8.0 mm) copper land pattern to sustain full 1500 W surge capability. The device exhibits a temperature coefficient of VBR = +0.087 %/°C, ensuring predictable voltage drift over operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse working voltage before clamping begins; defines upper limit of normal signal swing. |
| VBR min/max | 15.6 V / 17.2 V at IT = 1.0 mA - Confirmed breakdown threshold range; ensures reliable turn-on during overvoltage events. |
| VC @ IPPM | 23.2 V at 64.7 A (10/1000 μs) - Clamped voltage seen by protected circuit; determines minimum IC survival margin. |
| PPPM | 1500 W - Peak surge power handling capacity; validates suitability for ISO 7637-2 Pulse 1/2/5a and IEC 61000-4-5 Level 4. |
| IPPM | 64.7 A - Peak surge current supported at rated clamping voltage; used to size upstream fusing and trace routing. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMC (DO-214AB) - Surface-mount outline with 2.06 mm height and 7.75 mm length; compatible with standard SMT pick-and-place feeders. |
Pinout & Package
SMCJ14CAHM3_A/I is a two-terminal bidirectional TVS diode in SMC (DO-214AB) package. No polarity marking is present on the case; both terminals are functionally identical for AC transient suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Surge current path | Current flows bidirectionally through the avalanche junction; no DC bias dependency - ideal for protecting differential pairs or AC lines. |
| Case (cathode band absent) | Non-functional mechanical reference | No electrical connection; absence of band confirms bidirectional configuration per Vishay marking convention. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, RS-485 buses, or ungrounded sensor outputs without polarity concerns. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - required for Tier-1 ECUs and ADAS modules. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declarations; supports green manufacturing and end-of-life compliance. |
| MSL Level 1, 260 °C peak | Eliminates moisture sensitivity concerns during lead-free reflow; no baking required prior to assembly. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD >15 kV), improving protection margin for sub-20 V logic interfaces. |
Applications
| Automotive Sensor Protection | Industrial I/O Interface |
|---|---|
Use Scenario: Protecting CAN FD or LIN bus transceivers from load dump and inductive switching spikes in engine control units. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential signal pair (CAN_H/CAN_L) or supply rail (VCC/GND). Use Value: Limits transient voltage to ≤23.2 V, preserving transceiver integrity during ISO 7637-2 Pulse 5a (12 V system, 100 V/100 ms) events. |
Use Scenario: Hardening analog input channels of PLC modules against field-wiring induced surges and electrostatic discharge. IC Role / Device Role / Timing Role: Primary front-end TVS on 4–20 mA current loop or ±10 V analog inputs, mounted directly at connector. Use Value: Absorbs 1500 W surges without degradation, maintaining signal accuracy and preventing ADC latch-up during IEC 61000-4-5 4 kV tests. |
| Consumer Power Adapter Input | Telecom Line Card Surge Protection |
Use Scenario: Secondary-side overvoltage suppression in USB-C PD adapters after primary-side isolation. IC Role / Device Role / Timing Role: Clamp on 5–20 V output rails to protect downstream USB-PD controllers and port switches. Use Value: Fast response (<1 ps) prevents damage to low-voltage MOSFETs and gate drivers during output short-circuit recovery transients. |
Use Scenario: Ethernet PHY interface protection on PoE-powered network switches exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS on MDI pairs (pins 1–2, 3–6) and auxiliary power lines (pins 4–5, 7–8). Use Value: Withstands repeated 10/1000 μs surges up to 64.7 A while maintaining <1 μA leakage at 14 V, ensuring minimal signal distortion. |
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_A/I | Lower PPPM (400 W), smaller SMA package (DO-214AC), same VWM/VC specs. | Suitable only for lower-energy threats (IEC 61000-4-2 ESD, not IEC 61000-4-5); limited thermal mass. | Select when board space is constrained and surge requirements are ≤400 W. |
| SMCJ14AHE3_A/I | Unidirectional version; includes cathode band marking; identical VWM, VBR, and VC. | Requires correct polarity orientation; unsuitable for AC or floating differential lines. | Choose only for DC-biased rails where polarity is fixed and cost is prioritized over layout flexibility. |
Compared with SMCJ14CAHM3_A/I, SMAJ14CAHE3_A/I offers reduced footprint but sacrifices 73 % surge energy handling, while SMCJ14AHE3_A/I trades bidirectional capability for simpler polarity management - neither is pin-compatible, but both share the same PCB pad layout as SMCJ14CAHM3_A/I.
Availability
SMCJ14CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor protection, industrial I/O hardening, consumer power adapter safety, and telecom line card surge suppression requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ14CAHM3_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 and application-specific performance.
The SMCJ series was developed for high-power transient suppression in harsh environments, targeting automotive, industrial, and telecom systems where robustness against repetitive surges and extended temperature operation are critical.
FAQ
What does the "HM3" suffix indicate in SMCJ14CAHM3_A/I?
The HM3 suffix in SMCJ14CAHM3_A/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It confirms compliance with automotive reliability standards including temperature cycling, highly accelerated life testing (HALT), and electrostatic discharge immunity - essential for use in engine control, ADAS, and body electronics modules.
Is SMCJ14CAHM3_A/I suitable for protecting RS-485 communication lines?
Yes, SMCJ14CAHM3_A/I is well-suited for RS-485 protection due to its bidirectional clamping, 14 V standoff voltage matching common 12 V bus supplies, and ability to clamp transients to 23.2 V - safely below the absolute maximum ratings of most RS-485 transceivers like the THVD1550 or MAX14783E. Its low capacitance (<100 pF) also preserves signal integrity at data rates up to 20 Mbps.
How does the 1500 W peak pulse power rating translate to real-world surge immunity?
The 1500 W rating for SMCJ14CAHM3_A/I corresponds to a 10/1000 μs surge waveform delivering 64.7 A at 23.2 V clamping. This meets IEC 61000-4-5 Level 4 (4 kV line-to-earth, 2 kV line-to-line) and exceeds ISO 7637-2 Pulse 5a (100 V, 100 ms) requirements for 12 V automotive systems - validating its use in battery-connected circuits subject to load dump.
Can SMCJ14CAHM3_A/I be used in place of a unidirectional TVS like SMCJ14AHE3_A/I?
SMCJ14CAHM3_A/I can replace SMCJ14AHE3_A/I only if the circuit is AC-coupled or polarity-agnostic; it cannot substitute in DC-biased applications requiring cathode-anode orientation. While both share identical VWM, VBR, and VC, the bidirectional version lacks polarity marking and delivers symmetrical clamping - critical for differential signaling but unnecessary for simple rail-to-ground protection.
What PCB layout practices maximize the surge-handling capability of SMCJ14CAHM3_A/I?
To achieve full 1500 W surge rating, SMCJ14CAHM3_A/I must be mounted on minimum 0.31" × 0.31" (8.0 mm × 8.0 mm) copper pads per terminal, with direct thermal vias to inner ground planes. Trace lengths should be minimized (<5 mm), and the device placed within 5 mm of the protected connector or IC pin. Avoid narrow traces or thermal reliefs that increase impedance during surge events.
SMCJ14CAHM3_A/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- 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):
- 64.7A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMC)
SMCJ14CAHM3_A/I FAQ
1.How can I place an order for SMCJ14CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ14CAHM3_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 SMCJ14CAHM3_A/I reliable?
The price and inventory of SMCJ14CAHM3_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 SMCJ14CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMCJ14CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ14CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ14CAHM3_A/I?
SMCJ14CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ14CAHM3_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 SMCJ14CAHM3_A/I?
For technical support, including SMCJ14CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ14CAHM3_A/I requirements.
6.How does Aetrix verify that SMCJ14CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMCJ14CAHM3_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 SMCJ14CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMCJ14CAHM3_A/I?
All SMCJ14CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ14CAHM3_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 SMCJ14CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMCJ14CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ14CAHM3_A/I Tags
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