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Diodes Incorporated SMAJ12A-13-F
- Part No.:
- SMAJ12A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12A-13-F.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:32,007
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Product details
Overview
SMAJ12A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode with 12V reverse standoff voltage, 19.9V max clamping voltage at 20.1A peak pulse current, and SMA package. It protects DC power rails and signal lines in industrial power supplies, automotive ECUs, and USB interface circuits against ESD and lightning-induced surges.
For engineers reviewing the SMAJ12A-13-F datasheet, SMAJ12A-13-F pinout, SMAJ12A-13-F application, or SMAJ12A-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VDD, peak pulse current capability under IEC 61000-4-5 waveform, unidirectional polarity for DC-biased lines, and RoHS-compliant lead-free plating for reflow compatibility.
Technical Context
This TVS diode operates as a shunt-clamping device triggered by overvoltage events exceeding its 12V standoff threshold, entering avalanche breakdown to divert surge current away from downstream circuitry. Its glass-passivated die ensures stable breakdown characteristics and low leakage (<5µA at VRWM).
Designed for single-pulse transients per IEC 61000-4-2 (ESD) and IEC 61000-4-5 (surge), it sustains 400W peak pulse power for 10/1000µs waveform with thermal derating above +25°C ambient and full operation from –55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - Sustains single 10/1000µs surge without failure; defines maximum energy absorption capacity |
| Reverse Standoff Voltage (VRWM) | 12 V - Maximum continuous DC or RMS voltage before clamping begins; sets operating margin below protected rail |
| Max Clamping Voltage (VC) | 19.9 V @ IPP = 20.1 A - Upper voltage limit during surge; must remain below protected IC absolute maximum rating |
| Breakdown Voltage (VBR) | 13.3–14.7 V @ IT = 1.0 mA - Confirmed avalanche onset range; ensures reliable triggering above VRWM |
| Leakage Current (IR) | <5 µA @ 12 V - Minimal standby power loss and signal integrity impact on high-impedance nodes |
| Package | SMA - Standard surface-mount outline (4.0–4.6 mm length, 2.29–2.92 mm width); compatible with IPC-7351B footprint |
Pinout & Package
Two-terminal SMA package: anode and cathode terminals aligned along body axis, with cathode band marking polarity for unidirectional operation. No internal pin numbering; terminals are electrically symmetric except for polarity designation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to ground or lower-potential node in unidirectional configuration | Provides low-impedance path to reference plane when clamping negative transients or enabling bidirectional variants |
| Cathode | Current exit point during reverse-biased clamping; connected to protected line or higher-potential node | Defines polarity-sensitive connection: must be placed on side of circuit requiring overvoltage protection relative to reference |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 3 (1kV/2Ω) surges without degradation or thermal runaway |
| Glass Passivated Die | Ensures stable VBR tolerance and long-term reliability under repeated surge stress and humidity exposure |
| Lead-Free & Halogen-Free | Meets RoHS 3 and JEDEC J-STD-020 Level 1 moisture sensitivity requirements for standard reflow assembly |
| Fast Response Time | Sub-nanosecond turn-on enables clamping before sensitive logic or analog components experience overstress |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 12V DC input rail of programmable logic controller (PLC) power module exposed to load dump and inductive switching noise. IC Role / Device Role: Unidirectional shunt TVS placed between VIN and GND to clamp positive transients. Use Value: Limits voltage excursion to ≤19.9V, preserving 24V-rated regulators and microcontrollers while surviving 400W pulses. |
Use Scenario: LIN bus transceiver supply line in door module subjected to ISO 7637-2 Pulse 1 and Pulse 2a transients. IC Role / Device Role: Primary overvoltage clamp on VCC rail upstream of transceiver IC. Use Value: Maintains <5µA leakage to avoid quiescent current violations and clamps within 19.9V to prevent transceiver latch-up. |
| USB 2.0 Data Line Protection | DC Motor Drive Feedback Circuit |
Use Scenario: VBUS line of USB host port encountering hot-plug ESD events up to ±15kV per IEC 61000-4-2. IC Role / Device Role: Unidirectional TVS on 5V supply rail feeding USB controller and hub ICs. Use Value: Responds in <1ns to limit VBUS overshoot to 19.9V, preventing damage to 5.5V-tolerant USB PHY inputs. |
Use Scenario: Analog feedback path from motor current sense amplifier to MCU ADC input in BLDC driver board. IC Role / Device Role: Low-capacitance TVS on isolated analog signal line susceptible to coupled switching noise. Use Value: Provides 12V standoff with <5µA leakage to preserve ADC accuracy while clamping fast transients to safe levels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ12CA-13-F | Bidirectional variant with identical VRWM (12V), VBR (13.3–14.7V), and VC (19.9V), but symmetrical clamping for AC-coupled or floating lines | Required where signal lines lack defined DC bias or carry differential signals (e.g., RS-485, CAN) | Select when protecting bidirectional data lines or AC-powered circuits; not suitable for DC-rail-only use due to dual-direction conduction |
| SMBJ12A-13-F | Same electrical specs but SMB package (larger 4.6 × 3.95 mm footprint); 600W peak pulse power rating | Preferred for higher-energy surge environments (e.g., outdoor equipment, factory floor machinery) | Choose when board space allows larger footprint and system-level testing requires >400W margin; otherwise SMAJ12A-13-F offers optimal density |
Compared with SMAJ12CA-13-F, SMAJ12A-13-F provides polarity-specific clamping essential for DC-biased rails, while SMBJ12A-13-F trades compactness for higher surge headroom-making SMAJ12A-13-F the balanced choice for space-constrained 12V industrial and automotive modules.
Availability
SMAJ12A-13-F is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and USB interface protection requiring stable component supply and full traceability through production lifecycles.
Supply support for SMAJ12A-13-F 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with manufacturing certified to IATF 16949 and product qualification to AEC-Q101 for automotive-grade components.
This SMAJ series targets board-level transient protection in cost-sensitive, high-volume applications including consumer power adapters, industrial controls, and automotive sub-systems-emphasizing reliability, RoHS compliance, and standardized packaging.
FAQ
What is the maximum operating temperature for SMAJ12A-13-F?
The SMAJ12A-13-F has a specified junction temperature range of –55°C to +150°C and storage temperature range of –55°C to +150°C. Its steady-state power dissipation is rated at 1.0W at TL = +75°C, with thermal derating applied above that lead temperature per Figure 6 in the datasheet.
Is SMAJ12A-13-F suitable for IEC 61000-4-5 surge testing?
Yes-SMAJ12A-13-F is rated for 400W peak pulse power under the 10/1000µs waveform defined in IEC 61000-4-5. At 20.1A peak pulse current and 19.9V clamping voltage, it meets Level 3 (1kV/2Ω) requirements when properly laid out with low-inductance grounding.
Does SMAJ12A-13-F have automotive qualification?
No-the standard SMAJ12A-13-F is not AEC-Q101 qualified. Diodes offers the automotive-grade variant SMAJ12AQ-13-F, which undergoes additional stress testing, PPAP documentation, and is manufactured in IATF 16949-certified facilities for automotive applications.
How does the cathode band identify polarity on SMAJ12A-13-F?
The cathode band on the SMAJ12A-13-F marks the cathode terminal, which must be connected to the line being protected (e.g., 12V rail), while the anode connects to ground. This orientation ensures correct unidirectional clamping action-reverse placement would prevent proper surge diversion.
SMAJ12A-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 12V
- Voltage - Breakdown (Min):
- 13.3V
- Voltage - Clamping (Max) @ Ipp:
- 19.9V
- Current - Peak Pulse (10/1000µs):
- 20.1A
- 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:
- SMA
SMAJ12A-13-F FAQ
1.How can I place an order for SMAJ12A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12A-13-F 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 SMAJ12A-13-F reliable?
The price and inventory of SMAJ12A-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ12A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12A-13-F?
SMAJ12A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12A-13-F 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 SMAJ12A-13-F?
For technical support, including SMAJ12A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12A-13-F requirements.
6.How does Aetrix verify that SMAJ12A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ12A-13-F 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 SMAJ12A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ12A-13-F?
All SMAJ12A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12A-13-F, 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 SMAJ12A-13-F part is unused and in its original packaging.
Return procedure for SMAJ12A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12A-13-F Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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