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Vishay General Semiconductor - Diodes Division SMAJ14A-E3/61
- Part No.:
- SMAJ14A-E3/61
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14A-E3/61.pdf
- Description:
- TVS DIODE 14VWM 23.2VC DO214AC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMAJ14A-E3/61 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for primary overvoltage protection of 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) - used in automotive body control modules to protect CAN transceivers from load dump and inductive switching surges.
For engineers reviewing the SMAJ14A-E3/61 datasheet, SMAJ14A-E3/61 pinout, SMAJ14A-E3/61 application, or SMAJ14A-E3/61 equivalent, key selection criteria include its unidirectional polarity, SMA (DO-214AC) package thermal resistance (RθJA = 120 °C/W), 1.0 μA max reverse leakage at VWM, and AEC-Q101 qualification eligibility via HE3 suffix variants.
Technical Context
This TVS diode operates as a clamping device: under normal bias it presents high impedance (<1.0 μA leakage at 14 V), but triggers avalanche conduction when transient voltage exceeds its 15.6–17.2 V breakdown threshold, limiting downstream voltage to ≤23.2 V at 17.2 A. Its glass-passivated junction ensures stable breakdown and low dynamic impedance.
Designed for PCB-level surge immunity per IEC 61000-4-5 (indirect lightning) and ISO 7637-2 (automotive transients), it supports repetitive 0.01% duty cycle pulses and withstands 40 A non-repetitive forward surge (8.3 ms half-sine). Polarity marking (cathode band) enables correct orientation on 0.2" × 0.2" copper pads for optimal thermal dissipation.
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 - guaranteed avalanche initiation window for reliable trigger margin |
| VC @ IPPM | ≤23.2 V at 17.2 A - clamped voltage during 400 W 10/1000 μs surge, limiting stress on protected ICs |
| IPPM | 17.2 A - peak surge current capability with defined waveform, derated above 25 °C |
| PPPM | 400 W - transient energy handling capacity; reduced to 300 W for devices >78 V |
| RθJA | 120 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads |
| TJ max | +150 °C - maximum junction temperature enabling operation in under-hood automotive environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002. Cathode indicated by molded band; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal (unidirectional) | Connected to lower-potential side (e.g., GND or return path); defines forward conduction direction |
| Cathode (banded end) | Current exit terminal (unidirectional) | Connected to protected line (e.g., 12 V rail); avalanche conduction occurs from cathode to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 400 W peak pulse power (10/1000 μs) | Enables robust protection against ISO 7637-2 Pulse 1, 2a, and 5a transients without derating in most automotive PCB layouts |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or damage to downstream 16 V-tolerant ICs |
| MSL Level 1 (260 °C reflow) | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements |
| AEC-Q101 qualification path | HE3/HM3 suffix variants meet automotive reliability standards for mission-critical ECUs and ADAS sensors |
| Glass passivated junction | Ensures stable VBR over temperature and lifetime, with <0.1 %/°C drift and no parameter shift after 1000 surge cycles |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V supply lines in body control modules from load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and LDO input to clamp transients before regulation. Use Value: Limits voltage to ≤23.2 V during 17.2 A surges, preventing LDO overvoltage failure and ensuring uninterrupted microcontroller operation. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) of pressure sensors from ESD and field wiring faults. IC Role / Device Role / Timing Role: TVS connected across sensor output and ground to shunt fast transients before reaching precision DAC or op-amp circuitry. Use Value: Sub-1 ns response time and ≤23.2 V clamping preserve signal integrity and prevent ADC saturation or sensor calibration drift. |
| Consumer USB Port ESD Protection | Telecom Line Card Surge Suppression |
Use Scenario: Safeguarding USB 2.0 data lines (D+/D−) and VBUS in portable docking stations from human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Unidirectional SMAJ14A-E3/61 applied on VBUS rail only; paired with bidirectional TVS on data lines. Use Value: 1.0 μA leakage at 14 V avoids standby current drain, while 400 W rating absorbs multiple contact discharges without degradation. |
Use Scenario: Front-end protection of Ethernet PHY interfaces in PoE-powered network switches exposed to induced lightning surges (IEC 61000-4-5). IC Role / Device Role / Timing Role: TVS mounted at RJ45 connector entry point, clamping common-mode surges on power pairs before magnetics. Use Value: 120 °C/W RθJA allows direct mounting on compact line card PCBs without heatsinks, maintaining <150 °C junction temp during repetitive 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 |
|---|---|---|---|
| SMAJ14CA-E3/61 | Bidirectional variant; symmetric VBR (15.6–17.2 V) in both polarities; same VC and PPPM | Required for AC-coupled or floating signal lines (e.g., RS-485, audio) where polarity reversal occurs | Select SMAJ14CA-E3/61 only when protecting bidirectional signals; SMAJ14A-E3/61 is mandatory for DC rails with defined polarity. |
| SMBJ14A-E3/52 | Same VWM/VBR/VC specs but in SMB (DO-214AA) package; 69 °C/W RθJA vs. 120 °C/W; 600 W PPPM | Higher power handling and better thermal performance, but 30 % larger footprint and incompatible pad layout | Choose SMBJ14A-E3/52 only if surge energy exceeds 400 W or board layout allows SMB footprint; SMAJ14A-E3/61 fits space-constrained automotive modules. |
Compared with SMAJ14CA-E3/61 and SMBJ14A-E3/52, the SMAJ14A-E3/61 offers optimal balance of 400 W surge capability, SMA package size, and unidirectional polarity for cost-sensitive 12 V DC rail protection - making it preferred for body electronics where polarity is fixed and board area is constrained.
Availability
SMAJ14A-E3/61 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor nodes, consumer docking stations, and telecom line cards requiring stable component supply with RoHS-compliant, commercial-grade traceability.
Supply support for SMAJ14A-E3/61 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 qualification.
The SMAJ series is part of Vishay's TRANSZORB® TVS platform, engineered specifically for high-energy transient suppression in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum clamping voltage of the SMAJ14A-E3/61 under surge conditions?
The SMAJ14A-E3/61 clamps to a maximum of 23.2 V when subjected to its rated 17.2 A peak pulse current (10/1000 μs waveform). This value is guaranteed across temperature and lifetime per Vishay's characterization, and defines the upper voltage limit imposed on protected circuitry during transient events.
Is the SMAJ14A-E3/61 suitable for automotive applications requiring AEC-Q101 qualification?
The base SMAJ14A-E3/61 is RoHS-compliant and commercial-grade; however, Vishay offers AEC-Q101 qualified versions under ordering codes SMAJ14AHE3_X (e.g., SMAJ14AHE3_A), which share identical electrical specs but undergo extended reliability testing per AEC-Q101. Always verify suffix and datasheet revision for qualification status.
How does the SMAJ14A-E3/61 differ from the SMAJ14CA-E3/61?
The SMAJ14A-E3/61 is unidirectional (cathode-banded), intended for DC rail protection with defined polarity, while the SMAJ14CA-E3/61 is bidirectional - offering symmetric clamping in both directions, required for AC signals or floating lines. Their VBR, VC, and PPPM are identical, but polarity and marking differ.
What is the thermal resistance and recommended pad layout for the SMAJ14A-E3/61?
The SMAJ14A-E3/61 has 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 layout is specified in the Vishay datasheet (Doc. #88390) and must be followed to ensure rated 400 W pulse power and +150 °C junction temperature compliance.
Can the SMAJ14A-E3/61 be used in place of a 15 V Zener diode for overvoltage protection?
No - the SMAJ14A-E3/61 is not a regulating Zener diode. It is a transient suppressor optimized for short-duration surges (μs–ms), not continuous voltage regulation. Its 14 V standoff (VWM) is not a regulation point; sustained voltage >14 V will cause conduction and potential thermal failure. Use only for surge clamping, not steady-state regulation.
SMAJ14A-E3/61 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-E3/61 FAQ
1.How can I place an order for SMAJ14A-E3/61 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14A-E3/61 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-E3/61 reliable?
The price and inventory of SMAJ14A-E3/61 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14A-E3/61 is usually 5 days.
3.What payment methods are accepted for SMAJ14A-E3/61?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14A-E3/61 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14A-E3/61?
SMAJ14A-E3/61 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14A-E3/61 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-E3/61?
For technical support, including SMAJ14A-E3/61 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14A-E3/61 requirements.
6.How does Aetrix verify that SMAJ14A-E3/61 is sourced from the original manufacturer or authorized distributors?
All SMAJ14A-E3/61 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-E3/61 meets industry standards.
7.What is the process for return or replacement of SMAJ14A-E3/61?
All SMAJ14A-E3/61 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14A-E3/61, 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-E3/61 part is unused and in its original packaging.
Return procedure for SMAJ14A-E3/61:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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