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Vishay General Semiconductor - Diodes Division SMAJ14AHE3_A/I
- Part No.:
- SMAJ14AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14AHE3_A/I.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ14AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection of sensitive electronics. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown range at 1 mA, 23.2 V maximum clamping voltage at 17.2 A peak pulse current, and 400 W peak pulse power rating with 10/1000 μs waveform - deployed in automotive power line and sensor interface protection.
For engineers reviewing the SMAJ14AHE3_A/I datasheet, SMAJ14AHE3_A/I pinout, SMAJ14AHE3_A/I application, or SMAJ14AHE3_A/I equivalent, this AEC-Q101-qualified TVS offers validated surge immunity for 12 V automotive systems, low-leakage reverse operation below 14 V, fast sub-nanosecond response to transients, and compatibility with automated SMT assembly on DO-214AC (SMA) footprint.
Technical Context
This unidirectional TVS operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR (15.6–17.2 V), it avalanches into low-impedance conduction, limiting downstream voltage to ≤23.2 V at 17.2 A. Its glass-passivated junction ensures stable breakdown characteristics and long-term reliability under repetitive surge stress.
Designed for 12 V nominal systems, SMAJ14AHE3_A/I delivers 400 W peak pulse power (derated to 300 W above 78 V), supports 40 A non-repetitive forward surge (8.3 ms half-sine), and maintains <1.0 μA leakage at 14 V - enabling precise hold-off without loading signal or supply lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before clamping begins; matches 12 V automotive system nominal with 16.7 % margin. |
| VBR @ IT=1 mA | 15.6–17.2 V - Verified avalanche onset range; ensures reliable triggering without premature conduction during load dump or cranking. |
| VC @ IPPM=17.2 A | 23.2 V - Clamped voltage during 10/1000 μs surge; protects 24 V-tolerant ICs and MOSFETs downstream. |
| PPPM | 400 W - Peak pulse power handling per 10/1000 μs waveform; sufficient for ISO 7637-2 Pulse 1, 2a, and 5a transients. |
| IFSM | 40 A - Non-repetitive forward surge rating (8.3 ms); supports high-energy battery connection events without failure. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| Package | SMA (DO-214AC) - Standardized 2-pin SMT outline with 5.0 mm × 5.0 mm copper pad thermal design; MSL Level 1 compliant. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic case with matte tin-plated leads. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line (e.g., 12 V rail); conducts surge current to ground during overvoltage event. |
| Anode (unbanded end) | Reference / return path | Typically tied to system ground or low-impedance return; completes clamping path with minimal inductance. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock per JESD22 standards. |
| 400 W peak pulse power (10/1000 μs) | Withstands ISO 7637-2 Pulse 5a (load dump) up to 120 V/100 ms without degradation when mounted on 5 mm × 5 mm pads. |
| Low incremental surge resistance | Enables tight clamping (23.2 V @ 17.2 A) - reduces voltage overshoot across protected ICs and gate drivers. |
| MSL Level 1, 260 °C reflow compatible | Supports standard lead-free SMT reflow profiles without popcorn or delamination risk. |
| RoHS-compliant & halogen-free option available | HE3 suffix denotes RoHS-compliant construction; HM3 suffix adds halogen-free epoxy - meets automotive OEM material requirements. |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V battery-fed ECUs, body control modules, and lighting drivers against load dump and jump-start transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed between power rail and ground, responding within <1 ns to clamp surges. Use Value: Limits voltage to ≤23.2 V during 10/1000 μs pulses, preventing latch-up or gate oxide damage in downstream PMICs and microcontrollers. |
Use Scenario: Safeguarding analog sensor outputs (e.g., pressure, temperature) connected to ADC inputs in harsh industrial PLCs. IC Role / Device Role / Timing Role: Reverse-biased TVS on signal line to ground, holding off ≤14 V DC while clamping ESD and inductive kickback. Use Value: Maintains <1.0 μA leakage at 14 V, avoiding signal offset or gain error; clamps 8 kV HBM ESD to <25 V. |
| Consumer Power Adapter Input Protection | Telecom DC Power Feed Protection |
|
Use Scenario: Input-stage surge suppression in wall adapters and USB-C PD chargers exposed to AC line transients and hot-plug events. IC Role / Device Role / Timing Role: Unidirectional TVS on DC input rail, absorbing repetitive 400 W pulses without thermal runaway. Use Value: 3.3 W steady-state power dissipation and 120 °C/W RθJA enable operation without heatsink in compact enclosures. |
Use Scenario: Protecting -48 V telecom power feeds from lightning-induced surges and switching transients in remote radio units. IC Role / Device Role / Timing Role: Paired unidirectional TVS (cathode to -48 V rail) providing bidirectional clamping via complementary placement. Use Value: 150 °C max junction rating and -55 °C to +150 °C operating range ensure reliability in outdoor base station cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14A-E3/61 | Same electrical specs and SMA package; commercial-grade (non-AEC-Q101), RoHS-compliant only. | Lacks automotive qualification; suitable for consumer/industrial designs not requiring AEC validation. | Select SMAJ14AHE3_A/I for automotive production; use SMAJ14A-E3/61 where cost sensitivity outweighs qualification needs. |
| SMBJ14AHE3_A/I | Same VWM, VBR, and VC; higher 600 W PPPM rating due to SMB (DO-214AA) package with larger thermal mass. | Better suited for high-energy transients (e.g., ISO 16750-2 long-duration surges); requires larger PCB footprint. | Choose SMAJ14AHE3_A/I for space-constrained automotive modules; select SMBJ14AHE3_A/I when >400 W pulse handling is required. |
Compared with SMAJ14A-E3/61, SMAJ14AHE3_A/I adds AEC-Q101 qualification for automotive use; compared with SMBJ14AHE3_A/I, it trades 200 W pulse headroom for 30 % smaller board area in DO-214AC layout.
Availability
SMAJ14AHE3_A/I is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom power feed circuits requiring stable component supply with full AEC-Q101 traceability and RoHS compliance.
Supply support for SMAJ14AHE3_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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMAJ series is engineered specifically for high-reliability transient suppression in 12 V and 24 V automotive and industrial power systems - balancing compact size, AEC-Q101 compliance, and repeatable clamping performance.
FAQ
What is the clamping voltage of SMAJ14AHE3_A/I at its rated peak pulse current?
The SMAJ14AHE3_A/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 downstream components see no more than 23.2 V during surge events. The SMAJ14AHE3_A/I achieves this with low dynamic impedance, making it suitable for protecting 24 V-tolerant ICs in automotive applications.
Is SMAJ14AHE3_A/I qualified for automotive use?
Yes, SMAJ14AHE3_A/I is explicitly AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HE3" and documentation in datasheet 88390 (Revision 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and high-temperature operating life - validating its suitability for under-hood automotive modules. The SMAJ14AHE3_A/I meets all requirements for front-end power protection in ECUs, ADAS sensors, and lighting controllers.
What is the standoff voltage rating of SMAJ14AHE3_A/I, and how does it relate to 12 V automotive systems?
The SMAJ14AHE3_A/I has a standoff voltage (VWM) of 14 V, which provides a safe 16.7 % margin above the nominal 12 V battery rail while remaining well below typical load-dump peaks (up to 120 V). This ensures the device remains non-conductive during normal operation - with <1.0 μA leakage at 14 V - yet triggers reliably when transients exceed its 15.6–17.2 V breakdown range. The SMAJ14AHE3_A/I thus avoids false triggering during cranking or ripple while delivering robust protection during fault conditions.
Can SMAJ14AHE3_A/I be used in bidirectional configurations?
No, SMAJ14AHE3_A/I is a unidirectional TVS diode, indicated by the "A" suffix and cathode band marking. It conducts only in reverse bias (cathode to higher potential) and blocks forward current like a standard diode. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMAJ14CA); SMAJ14AHE3_A/I must be used with correct polarity orientation - cathode toward the protected line - and cannot substitute for bidirectional types without circuit redesign.
What package type does SMAJ14AHE3_A/I use, and what are its key mounting requirements?
SMAJ14AHE3_A/I uses the SMA (DO-214AC) surface-mount package - a 2-pin, low-profile outline measuring 4.93 mm × 2.54 mm with gull-wing leads. Per Vishay's thermal specification, it requires minimum 5.0 mm × 5.0 mm copper pads per terminal to achieve rated 400 W pulse power and maintain junction temperature within limits. The SMAJ14AHE3_A/I is MSL Level 1 and compatible with standard lead-free reflow profiles peaking at 260 °C.
SMAJ14AHE3_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:
- 1
- Bidirectional Channels:
- -
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ14AHE3_A/I FAQ
1.How can I place an order for SMAJ14AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14AHE3_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 SMAJ14AHE3_A/I reliable?
The price and inventory of SMAJ14AHE3_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 SMAJ14AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMAJ14AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14AHE3_A/I?
SMAJ14AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14AHE3_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 SMAJ14AHE3_A/I?
For technical support, including SMAJ14AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14AHE3_A/I requirements.
6.How does Aetrix verify that SMAJ14AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMAJ14AHE3_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 SMAJ14AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMAJ14AHE3_A/I?
All SMAJ14AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14AHE3_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 SMAJ14AHE3_A/I part is unused and in its original packaging.
Return procedure for SMAJ14AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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