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Vishay General Semiconductor - Diodes Division SMAJ14A-E3/5A
- Part No.:
- SMAJ14A-E3/5A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14A-E3/5A.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,851
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Product details
Overview
SMAJ14A-E3/5A from Vishay General Semiconductor is a unidirectional transient voltage suppressor (TVS) diode designed for robust overvoltage protection on DC power rails and signal lines. It features a 14 V standoff voltage (VWM), 15.6–17.2 V breakdown range at 1 mA, clamps transients to ≤23.2 V at 17.2 A peak pulse current, and delivers 400 W peak pulse power (10/1000 μs waveform). It is widely deployed in automotive body control modules to protect 12 V supply inputs against load dump and inductive switching surges.
For engineers reviewing the SMAJ14A-E3/5A datasheet, SMAJ14A-E3/5A pinout, SMAJ14A-E3/5A application, or SMAJ14A-E3/5A equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package compatibility with automated SMT placement, AEC-Q101 qualification status (via HE3/HM3 variants), and precise clamping performance under repetitive surge conditions.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches rapidly (<1 ps response) to divert surge current away from downstream ICs. Its low incremental surge resistance (typ. <0.5 Ω) ensures minimal voltage overshoot during high-di/dt events like relay coil de-energization.
The device is rated for 40 A non-repetitive forward surge (8.3 ms half-sine) and maintains stable clamping up to TJ = 150 °C. Thermal resistance is 120 °C/W (junction-to-ambient, on 5 mm × 5 mm copper pads), enabling reliable operation in compact automotive PCB layouts without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before leakage exceeds 1 μA; defines safe DC rail margin for 12 V systems. |
| VBR min/max | 15.6 V / 17.2 V at IT = 1 mA - Confirmed breakdown window ensures predictable turn-on across manufacturing lot and temperature. |
| VC @ IPPM | ≤23.2 V at 17.2 A - Clamping voltage limits stress on protected ICs (e.g., MCU I/O or LDO input) during 400 W surge events. |
| PPPM | 400 W (10/1000 μs) - Peak pulse power rating validated per IEC 61000-4-5; derates to 300 W above 78 V. |
| IFSM | 40 A (8.3 ms half-sine) - Withstands single high-energy inductive switch-off events without degradation. |
| TJ max | +150 °C - Enables use in under-hood automotive environments where ambient temperatures exceed 105 °C. |
| RθJA | 120 °C/W - Thermal resistance measured on standard 0.2″ × 0.2″ copper pads; informs thermal design margin for sustained power dissipation. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads. Cathode indicated by band; polarity critical for unidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; completes shunt path during avalanche conduction. |
| Cathode | High-side connection point | Connected to protected line (e.g., 12 V rail); reverse-biased during normal operation; conducts when VAK > VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Handles ISO 7637-2 Pulse 1/2a/5a surge waveforms common in 12 V automotive systems without failure. |
| Fast response time (<1 ps) | Clamps transients before sensitive logic or analog circuitry experiences damaging overvoltage. |
| MSL Level 1 (260 °C reflow) | Compatible with standard lead-free SMT reflow profiles without moisture-induced damage. |
| AEC-Q101 qualified option (HE3 suffix) | Validated for automotive-grade reliability including HTOL, temperature cycling, and ESD testing per JESD22. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage under thermal cycling and humidity exposure. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
|
Use Scenario: Protecting 12 V power input of BCM microcontroller from load-dump transients (ISO 16750-2) and relay coil flyback. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping spikes within 100 ns. Use Value: Limits voltage to ≤23.2 V during 400 W surges, preventing latch-up or gate oxide damage in protected MCU and CAN transceivers. |
Use Scenario: Safeguarding 24 V digital input channels of programmable logic controllers against field-wiring induced surges and ESD. IC Role / Device Role / Timing Role: Standoff-rated TVS on each input line, operating below system VCC but above noise floor. Use Value: Maintains ≤1 μA leakage at 24 V nominal, ensuring clean logic thresholds while clamping 1 kV/500 A transients per IEC 61000-4-5. |
| Consumer Appliance Motor Drive Board | Telecom Power Supply Front-End |
|
Use Scenario: Suppressing inductive kickback from brushed DC motor commutation on 12–24 V supply rails. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main DC bus, positioned upstream of buck converters and gate drivers. Use Value: Absorbs 40 A surge currents (8.3 ms) without parametric shift, preserving MOSFET gate driver integrity and reducing need for bulk capacitance. |
Use Scenario: Secondary-side transient suppression on +48 V telecom power distribution network feeding baseband processors. IC Role / Device Role / Timing Role: Fast-reacting unidirectional clamp on regulated output rail, coordinated with upstream MOVs and fuses. Use Value: Delivers 23.2 V clamping at 17.2 A, keeping downstream ASICs within absolute maximum ratings during lightning-induced surges. |
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-M3/5A | Halogen-free, RoHS-compliant variant; identical electrical specs and package. | No functional difference; selected when halogen-free compliance is mandated by OEM or regional regulation. | Choose M3/5A if halogen-free material declaration is required; otherwise E3/5A is standard commercial grade. |
| SMAJ14AHE3_A/I | AEC-Q101 qualified; same VWM, VBR, and PPPM, but validated for automotive reliability stress tests. | Required for automotive production programs; not necessary for industrial or consumer applications. | Select HE3_A/I only when automotive qualification (HTOL, TC, ESD) is contractually specified; E3/5A suffices for non-automotive use. |
Compared with SMAJ14A-M3/5A and SMAJ14AHE3_A/I, the SMAJ14A-E3/5A provides identical clamping performance and thermal behavior in the SMA package, but differs in material compliance (RoHS only) and qualification scope-making it optimal for cost-sensitive, non-automotive designs requiring proven surge immunity without extended reliability validation.
Availability
SMAJ14A-E3/5A is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and telecom power supply designs requiring stable component supply, consistent surge performance, and full traceability across production lots.
Supply support for SMAJ14A-E3/5A 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 high-reliability, high-efficiency solutions.
The SMAJ series was engineered specifically for board-level transient protection in harsh environments-prioritizing fast clamping, repeatable surge endurance, and automotive-grade manufacturability in the DO-214AC footprint.
FAQ
What is the clamping voltage of SMAJ14A-E3/5A at its rated peak pulse current?
The SMAJ14A-E3/5A clamps to a maximum of 23.2 V when subjected to its peak pulse current of 17.2 A (10/1000 μs waveform). This value is guaranteed across temperature and manufacturing lot, and is critical for ensuring protected ICs remain within their absolute maximum voltage ratings during surge events. The SMAJ14A-E3/5A achieves this with low dynamic impedance, minimizing overshoot beyond VC.
Is SMAJ14A-E3/5A suitable for automotive applications?
The SMAJ14A-E3/5A itself is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the functionally identical SMAJ14AHE3_A/I variant with full AEC-Q101 qualification. For automotive production, specify the HE3 suffix. The SMAJ14A-E3/5A remains appropriate for automotive development, prototyping, or non-safety-critical subsystems where qualification is not mandated-retaining identical electrical performance and SMA package fit.
What is the standoff voltage (VWM) of SMAJ14A-E3/5A, and why does it matter?
The SMAJ14A-E3/5A has a standoff voltage VWM of 14 V, meaning it remains in high-impedance state with ≤1 μA leakage up to this DC or RMS voltage. This parameter ensures no interference with normal 12 V system operation while providing sufficient margin above nominal rail voltage to avoid false triggering. It directly determines compatibility with 12 V automotive and industrial supplies.
How does the SMAJ14A-E3/5A differ from bidirectional variants like SMAJ14CA?
The SMAJ14A-E3/5A is unidirectional and features polarity (cathode band), making it suitable for DC rail protection where reverse voltage is blocked by system design. In contrast, SMAJ14CA is bidirectional with symmetric clamping in both directions-used for AC lines or data buses like RS-485. They share identical VBR, VC, and PPPM, but differ in polarity marking, leakage behavior under forward bias, and application context-not interchangeable without circuit review.
What package type does SMAJ14A-E3/5A use, and what are its mounting requirements?
The SMAJ14A-E3/5A uses the SMA (DO-214AC) surface-mount package-a low-profile, two-terminal case with standardized 5.28 mm × 4.50 mm outline and 2.54 mm lead pitch. It requires 0.2″ × 0.2″ (5.0 mm × 5.0 mm) copper pads per terminal for rated 400 W pulse power dissipation and meets MSL Level 1 for lead-free reflow. No special stencil or placement adjustments are needed beyond standard SMT guidelines.
SMAJ14A-E3/5A 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ14A-E3/5A FAQ
1.How can I place an order for SMAJ14A-E3/5A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14A-E3/5A 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 SMAJ14A-E3/5A reliable?
The price and inventory of SMAJ14A-E3/5A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14A-E3/5A is usually 5 days.
3.What payment methods are accepted for SMAJ14A-E3/5A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14A-E3/5A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14A-E3/5A?
SMAJ14A-E3/5A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14A-E3/5A 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 SMAJ14A-E3/5A?
For technical support, including SMAJ14A-E3/5A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14A-E3/5A requirements.
6.How does Aetrix verify that SMAJ14A-E3/5A is sourced from the original manufacturer or authorized distributors?
All SMAJ14A-E3/5A 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 SMAJ14A-E3/5A meets industry standards.
7.What is the process for return or replacement of SMAJ14A-E3/5A?
All SMAJ14A-E3/5A units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14A-E3/5A, 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 SMAJ14A-E3/5A part is unused and in its original packaging.
Return procedure for SMAJ14A-E3/5A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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