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Diodes Incorporated SMAJ14A-13
- Part No.:
- SMAJ14A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14A-13.pdf
- Description:
- TVS DIODE 14VWM 23.2VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:4,373
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Product details
Overview
SMAJ14A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 14V reverse standoff voltage (VRWM), 15.6–17.2V breakdown voltage (VBR) at 1mA, 23.2V max clamping voltage (VC) at 17.2A peak pulse current (IPP), and operates from –55°C to +150°C - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMAJ14A-13 datasheet, SMAJ14A-13 pinout, SMAJ14A-13 application, or SMAJ14A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VDD tolerance, unidirectional polarity alignment with DC rail direction, IEC 61000-4-5 surge current handling, and SMA package thermal dissipation under sustained transients.
Technical Context
This TVS diode uses a glass-passivated silicon junction optimized for fast response (<1 ps) to ESD and lightning-induced surges. Its unidirectional configuration provides low-leakage forward conduction while clamping reverse transients above VRWM.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and IEC 61000-4-5 (surge) immunity standards. Clamping performance is validated using 8.3/20 µs current waveforms with ≤4 pulses per minute duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3 ms half-sine surge without failure under JEDEC test conditions |
| Reverse Standoff Voltage | 14 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage | 15.6–17.2 V @ 1 mA - precise VBR window ensures reliable turn-on just above operating rail |
| Clamping Voltage | 23.2 V @ 17.2 A - limits transient voltage seen by downstream ICs during 400W surge event |
| Peak Pulse Current | 17.2 A - maximum non-repetitive surge current the device can shunt without degradation |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial ambient environments |
| Package | SMA (DO-214AC) - surface-mount footprint compatible with automated PCB assembly and thermal relief pads |
Pinout & Package
SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band marking on unidirectional units. Dimensions: 4.00–4.60 mm length × 2.29–2.92 mm width × 1.27–1.63 mm height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or return path; defines forward conduction direction |
| Cathode | High-side surge input terminal | Connected to protected line; conducts during reverse overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR and low leakage across temperature and lifetime |
| 400W peak pulse rating | Meets IEC 61000-4-5 Level 3 (1 kV/2 Ω) surge immunity requirements |
| Fast response time | Sub-nanosecond clamping onset protects sensitive logic and analog inputs |
| RoHS-compliant finish | Matte tin plating supports lead-free reflow soldering per J-STD-020C Level 1 |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 12V DC input rail in programmable logic controller (PLC) power stage exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converter input to limit transient voltage to <24V. Use Value: Prevents overvoltage damage to buck controller ICs rated for 36V absolute max input. | Use Scenario: LIN bus transceiver power supply line in door module subjected to battery clamp transients. IC Role / Device Role / Timing Role: Unidirectional TVS tied between VBAT and GND to absorb 12V system surges without affecting LIN signal integrity. Use Value: Maintains transceiver operation during ISO 7637-2 Pulse 5a (load dump) events up to 100V/400ms. |
| USB Type-C Port ESD Protection | Smart Meter Communication Interface |
Use Scenario: VBUS line protection in USB-C receptacle where hot-plug events induce fast-rising ESD pulses. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary fuse and upstream of USB PD controller. Use Value: Clamps 8kV contact ESD (IEC 61000-4-2) to <25V within 1 ns, preserving PD negotiation logic. | Use Scenario: RS-485 transceiver power input in utility smart meter exposed to induced surges on long outdoor wiring. IC Role / Device Role / Timing Role: DC rail protector on transceiver VCC pin to prevent latch-up during 10/700 µs telecom surges. Use Value: Limits clamped voltage to 23.2V, staying within transceiver's 27V absolute maximum rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14CA-13 | Bi-directional version; symmetric clamping for AC-coupled or bidirectional signal lines | Required where protected line swings both above and below ground (e.g., RS-232, audio) | Select only if polarity reversal or AC signal protection is needed; otherwise unidirectional offers lower leakage |
| P6SMB14A-T | Same VRWM and VC but 600W rating; larger SMB package (4.5×3.2 mm) with higher thermal mass | Better suited for high-duty-cycle or repeated surge environments due to higher PM(AV) = 1.5W | Choose when board space allows SMB and surge repetition rate exceeds 4 pulses/minute |
Compared with SMAJ14CA-13 and P6SMB14A-T, SMAJ14A-13 delivers optimal balance of compact SMA footprint, 400W surge capability, and low-leakage unidirectional clamping for cost-sensitive 12V DC rail protection.
Availability
SMAJ14A-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, USB Type-C port protection, and smart meter communication interfaces requiring stable component supply and RoHS-compliant sourcing.
Supply support for SMAJ14A-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression product line, engineered specifically for robust, surface-mount overvoltage protection in automotive, industrial, and consumer power systems.
FAQ
What is the difference between SMAJ14A-13 and SMAJ14CA-13?
SMAJ14A-13 is unidirectional and clamps only reverse-polarity transients on a DC line, with cathode marked. SMAJ14CA-13 is bi-directional, clamping surges of either polarity - ideal for AC signals or floating lines. The 'C' suffix explicitly denotes bi-directionality per Diodes' ordering convention.
Can SMAJ14A-13 be used in place of a 15V zener diode for voltage regulation?
No - SMAJ14A-13 is not designed for continuous regulation. It conducts only during transient overvoltage events and has no specified zener knee or regulation curve. Its 14V VRWM is a standoff threshold, not a regulated output; sustained operation above VRWM causes thermal runaway.
What is the maximum allowable PCB trace length between SMAJ14A-13 and the protected IC?
For effective ESD and fast surge suppression, keep the trace from cathode to protected node ≤5 mm and from anode to ground plane ≤3 mm. Longer traces add inductance that degrades clamping response; use dedicated ground pour and minimize loop area per IEC 61000-4-2 layout guidelines.
Does SMAJ14A-13 meet AEC-Q200 stress testing requirements for automotive use?
No - SMAJ14A-13 is not AEC-Q200 qualified. While it operates from –55°C to +150°C and meets IEC surge standards, Diodes does not list it in their AEC-Q200-certified TVS portfolio. For automotive safety-critical applications, specify AEC-Q200-qualified alternatives such as D3V3M1UQ-7.
SMAJ14A-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMAJ)
SMAJ14A-13 FAQ
1.How can I place an order for SMAJ14A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14A-13 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-13 reliable?
The price and inventory of SMAJ14A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ14A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14A-13?
SMAJ14A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14A-13 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-13?
For technical support, including SMAJ14A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14A-13 requirements.
6.How does Aetrix verify that SMAJ14A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ14A-13 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-13 meets industry standards.
7.What is the process for return or replacement of SMAJ14A-13?
All SMAJ14A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14A-13, 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-13 part is unused and in its original packaging.
Return procedure for SMAJ14A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ14A-13 Tags
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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