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Vishay General Semiconductor - Diodes Division SMAJ14CAHM3_A/I
- Part No.:
- SMAJ14CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CAHM3_A/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,383
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Product details
Overview
SMAJ14CAHM3_A/I from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode designed for robust ESD and surge protection on signal/power 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 (10/1000 μs waveform), deployed in automotive sensor interfaces and industrial I/O protection.
For engineers reviewing the SMAJ14CAHM3_A/I datasheet, SMAJ14CAHM3_A/I pinout, SMAJ14CAHM3_A/I application, or SMAJ14CAHM3_A/I equivalent, key selection criteria include bidirectional clamping symmetry, AEC-Q101 qualification status, MSL Level 1 moisture sensitivity, and DO-214AC package thermal resistance (RθJA = 120 °C/W).
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ leakage at 14 V), but triggers into low-impedance conduction when transients exceed its 15.6–17.2 V breakdown range (VBR at 1 mA). Its glass-passivated junction ensures stable avalanche characteristics across temperature.
Designed for unclamped inductive switching events (e.g., relay coils, solenoids) and lightning-induced surges, it delivers sub-nanosecond response time and maintains clamping performance up to 150 °C junction temperature, with derated pulse power above 25 °C per Fig. 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before significant leakage; defines safe working margin below clamping threshold. |
| VBR (min/max) | 15.6 V / 17.2 V at 1 mA - Confirmed breakdown range ensuring reliable turn-on during overvoltage events without premature conduction. |
| VC @ IPPM | 23.2 V at 17.2 A - Clamping voltage under 400 W 10/1000 μs surge; limits downstream IC stress to safe levels. |
| IPPM | 17.2 A - Peak surge current capability with defined waveform; determines survivability against IEC 61000-4-5 Level 4 surges. |
| PPPM | 400 W - Peak pulse power rating (10/1000 μs); enables protection of 12 V automotive and industrial bus lines. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and sealed enclosures. |
| Package | SMA (DO-214AC) - Surface-mount package with 5.0 mm × 5.0 mm copper pad thermal design; RθJA = 120 °C/W. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with matte tin-plated leads, MSL Level 1 compliant (peak reflow 260 °C), UL 94 V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to protected line; no polarity marking on bidirectional devices like SMAJ14CAHM3_A/I. |
| Cathode | Current exit terminal in forward bias; symmetrical with anode in bidirectional configuration | Connected to reference ground or return path; identical electrical behavior to anode due to CA suffix design. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control modules and ADAS sensor interfaces per stress test requirements. |
| 400 W peak pulse power | Withstands IEC 61000-4-5 10/1000 μs surge waveforms up to Level 4 (4 kV open-circuit) on 12 V supply rails. |
| Low clamping ratio (VC/VWM = 1.66) | Minimizes voltage overshoot during clamping-critical for protecting 15 V-tolerant microcontrollers and CAN transceivers. |
| MSL Level 1 | Enables standard SMT reflow without baking; compatible with high-volume automated assembly lines. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JESD201 Class 2 whisker resistance for long-term reliability in humid environments. |
Applications
| Automotive Sensor Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting analog output lines (e.g., 4–20 mA current loops) and LIN bus interfaces in vehicle cabin sensors against load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Bidirectional shunt clamp absorbing positive/negative transients while maintaining signal integrity during normal operation. Use Value: Prevents latch-up or permanent damage to precision DACs and op-amps by limiting transient voltage to ≤23.2 V at full surge current. |
Use Scenario: Safeguarding digital input terminals of programmable logic controllers exposed to inductive kickback from solenoid valves and motor contactors. IC Role / Device Role / Timing Role: Fast-response voltage limiter placed directly at connector entry point to divert surge energy before reaching isolation barriers. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) immunity standards without additional filtering components. |
| Telecom Line Interface | Consumer USB Port ESD Protection |
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 surge suppression element mounted adjacent to connector, operating in parallel with secondary TVS arrays. Use Value: Maintains signal fidelity up to 10 Mbps by limiting junction capacitance to <100 pF at 0 V and preserving edge integrity during clamping. |
Use Scenario: Providing system-level ESD immunity on USB 2.0 data lines (D+/D−) in smart home hubs and set-top boxes per IEC 61000-4-2 Level 4 (±15 kV air). IC Role / Device Role / Timing Role: Secondary protection stage after integrated ESD diodes in USB PHY, handling bulk energy dissipation. Use Value: Survives repeated ±30 kV contact discharge events without parameter shift, verified via AEC-Q101 HBM and MM testing. |
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 | Same electrical specs and AEC-Q101 qualification; RoHS-compliant but contains brominated flame retardants (non-halogen-free). | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive industrial use). | Select SMAJ14CAHE3_A/I if halogen content is unrestricted and cost optimization is prioritized. |
| SMBJ14CAHM3_A/I | Identical VWM, VBR, VC; higher 600 W PPPM rating but larger SMB (DO-214AA) package (6.2 mm × 3.5 mm vs. SMA's 4.5 mm × 2.7 mm). | Better suited for higher-energy surges; requires PCB layout revision due to larger footprint and different pad geometry. | Choose SMBJ14CAHM3_A/I only when 400 W is insufficient and board space allows larger package. |
Compared with SMAJ14CAHE3_A/I, the SMAJ14CAHM3_A/I offers halogen-free compliance critical for automotive OEMs, while versus SMBJ14CAHM3_A/I it provides identical protection in a 30 % smaller footprint-enabling compact designs without sacrificing AEC-Q101 validation.
Availability
SMAJ14CAHM3_A/I is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, and telecom line protection requiring stable component supply, long-term lifecycle support, and AEC-Q101 traceability.
Supply support for SMAJ14CAHM3_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 automotive-grade validation.
The SMAJ series targets high-reliability transient suppression in harsh environments-designed specifically for automotive, industrial, and telecom systems needing certified surge resilience and compact surface-mount integration.
FAQ
What does the "CA" suffix indicate in SMAJ14CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration: SMAJ14CAHM3_A/I conducts identically in both polarities, making it suitable for AC-coupled lines or differential buses like RS-485 where polarity reversal may occur. Unlike unidirectional "A" variants, it has no cathode band marking and exhibits matched VBR and VC in either direction-confirmed in the Electrical Characteristics table on page 2 of Vishay document 88390.
Is SMAJ14CAHM3_A/I qualified to AEC-Q101?
Yes, SMAJ14CAHM3_A/I is AEC-Q101 qualified, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, and AEC-Q101 validated). This qualification covers stress tests including HTGB, HTRB, TCT, and ESD per JESD22 standards, enabling use in automotive powertrain and chassis modules where failure modes must be rigorously controlled.
What is the maximum clamping voltage of SMAJ14CAHM3_A/I under surge conditions?
The maximum clamping voltage (VC) of SMAJ14CAHM3_A/I is 23.2 V at 17.2 A peak pulse current (IPPM) with a 10/1000 μs waveform. This value is measured per Figure 1 and Table on page 2 of the datasheet and represents the upper limit of voltage imposed on protected circuitry during worst-case surge events.
How does the SMA (DO-214AC) package of SMAJ14CAHM3_A/I affect thermal performance?
The SMA (DO-214AC) package of SMAJ14CAHM3_A/I delivers 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 enables sustained 3.3 W power dissipation at 50 °C ambient, supporting intermittent surge duty cycles without thermal runaway in enclosed industrial enclosures.
Can SMAJ14CAHM3_A/I replace SMAJ14A in existing designs?
No-SMAJ14CAHM3_A/I is bidirectional while SMAJ14A is unidirectional; substituting them requires verifying circuit polarity and grounding topology. SMAJ14A has a cathode band and conducts only in reverse bias, whereas SMAJ14CAHM3_A/I clamps symmetrically. Direct replacement may cause malfunction in DC-biased lines unless the design inherently supports bidirectional protection.
SMAJ14CAHM3_A/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:
- 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/I FAQ
1.How can I place an order for SMAJ14CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CAHM3_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 SMAJ14CAHM3_A/I reliable?
The price and inventory of SMAJ14CAHM3_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 SMAJ14CAHM3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ14CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CAHM3_A/I?
SMAJ14CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CAHM3_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 SMAJ14CAHM3_A/I?
For technical support, including SMAJ14CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CAHM3_A/I requirements.
6.How does Aetrix verify that SMAJ14CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14CAHM3_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 SMAJ14CAHM3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ14CAHM3_A/I?
All SMAJ14CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CAHM3_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 SMAJ14CAHM3_A/I part is unused and in its original packaging.
Return procedure for SMAJ14CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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