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Diodes Incorporated SMAJ12CA-13
- Part No.:
- SMAJ12CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ12CA-13.pdf
- Description:
- TVS DIODE 12VWM 19.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,937
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Product details
Overview
SMAJ12CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power rails and signal lines. It features a 12V reverse standoff voltage (VRWM), 13.3–14.7V breakdown voltage (VBR) at 1mA, 19.9V max clamping voltage (VC) at 20.1A 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 SMAJ12CA-13 datasheet, SMAJ12CA-13 pinout, SMAJ12CA-13 application, or SMAJ12CA-13 equivalent, key selection criteria include clamping performance under 8.3ms surge, bidirectional symmetry, RoHS-compliant matte tin plating, and compatibility with automated SMT assembly on FR-4 PCBs.
Technical Context
This bi-directional TVS diode uses glass-passivated silicon junction technology to deliver fast response (<1 ps) to ESD and lightning-induced transients. Its symmetrical I-V characteristic enables identical clamping in both polarities, eliminating polarity-sensitive layout constraints.
The device complies with IEC 61000-4-2 (±30kV contact), IEC 61000-4-4 (±4kV EFT), and ISO 16750-2 (automotive load dump), with thermal derating defined up to 175°C storage and 150°C operating junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W (non-repetitive, 8.3ms half-sine wave per JEDEC) |
| Reverse Standoff Voltage | 12V (maximum continuous DC or RMS voltage before significant leakage) |
| Breakdown Voltage | 13.3–14.7V @ 1mA (guaranteed conduction onset threshold) |
| Max Clamping Voltage | 19.9V @ 20.1A IPP (voltage seen by protected circuit during worst-case surge) |
| Leakage Current | ≤5μA @ 12V VRWM (negligible standby power loss in low-power systems) |
| Operating Temperature | –55°C to +150°C (supports under-hood automotive and industrial ambient extremes) |
| Package | SMA (DO-214AC), 4.0–4.6mm length × 2.29–2.92mm width × 1.27–1.63mm height |
Pinout & Package
Two-terminal SMA (DO-214AC) package with cathode band omitted (bi-directional symmetry). Terminals are solderable per MIL-STD-202, Method 208; lead-free matte tin finish compliant with RoHS and JEDEC J-STD-020C Level 1 moisture sensitivity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional surge path | Identical clamping behavior in either polarity; no polarity marking required |
| Case | Thermal and mechanical interface | Molded plastic UL 94V-0 housing; 0.064g mass supports reflow profile stability |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR tolerance and long-term reliability under thermal cycling |
| 400W peak pulse rating | Withstands 20.1A surges without degradation - sufficient for ISO 7637-2 Pulse 5a load dump |
| Bi-directional symmetry | Eliminates need for orientation-aware placement; reduces BOM count in AC-coupled interfaces |
| RoHS-compliant matte tin plating | Ensures solderability and intermetallic formation control in lead-free reflow (260°C peak) |
Applications
| Industrial Motor Drives | Automotive Body Control Module |
|---|---|
Use Scenario: Protection of 12V CAN bus transceivers against battery line transients and ESD. IC Role / Device Role / Timing Role: Bi-directional clamping element placed between CAN_H/CAN_L and chassis ground. Use Value: Limits differential surge to ≤19.9V, preserving transceiver integrity during ISO 16750-2 load dump events. | Use Scenario: Input rail protection for microcontroller-based door lock actuators exposed to jump-start surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 12V supply input prior to LDO regulator. Use Value: Prevents latch-up or permanent damage during 24V jump-start conditions (up to 100ms duration). |
| DC Power Supply Outputs | Telecom Line Interface Cards |
Use Scenario: Secondary-side output protection in 12V/5A AC-DC adapters for PoE-powered devices. IC Role / Device Role / Timing Role: Parallel-connected TVS across output terminals to absorb switching noise and external surges. Use Value: Maintains regulated output within spec during 400W transient events without affecting steady-state regulation. | Use Scenario: Surge suppression on 12V bias rails feeding analog front-end amplifiers in DSL line cards. IC Role / Device Role / Timing Role: Low-capacitance (≈100pF) bi-directional clamp minimizing signal distortion on sensitive analog paths. Use Value: Provides <1ps response with <20V clamping, meeting GR-1089-CORE Class B immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ12CA-13 | 600W rating, larger SMB (DO-214AA) package (4.6 × 3.9 mm), higher thermal mass | Better suited for higher-energy surges; requires more PCB area | Select when peak pulse energy exceeds 400W but footprint allows SMB size |
| P6SMB12CA | Same 400W rating and SMA package, but legacy marking and non-RoHS-compliant plating unless -F suffix | Legacy design-in only; lacks Diodes Inc.'s tighter VBR tolerance (±5% vs ±7%) | Prefer SMAJ12CA-13 for new designs requiring RoHS compliance and tighter parametric control |
Compared with SMBJ12CA-13 and P6SMB12CA, SMAJ12CA-13 delivers optimal balance of high surge capability, compact SMA footprint, guaranteed RoHS compliance, and tight 13.3–14.7V VBR range - making it ideal for space-constrained, high-volume automotive and industrial applications where consistency and manufacturability are critical.
Availability
SMAJ12CA-13 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, DC power supply outputs, and telecom line interface cards requiring stable component supply across multi-year production cycles.
Supply support for SMAJ12CA-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, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMAJ series belongs to Diodes' transient voltage suppression product line, engineered specifically for high-reliability, surface-mount overvoltage protection in automotive, industrial, and communications infrastructure applications.
FAQ
What is the maximum clamping voltage of SMAJ12CA-13 at its rated peak pulse current?
The maximum clamping voltage (VC) is 19.9V at 20.1A peak pulse current (IPP), measured under standardized 8.3ms half-sine waveform conditions per JEDEC. This value represents the upper limit of voltage imposed on protected circuitry during worst-case surge events, ensuring downstream components remain within safe operating limits.
Is SMAJ12CA-13 compatible with lead-free reflow soldering processes?
Yes - SMAJ12CA-13 features matte tin lead-free plating compliant with RoHS Directive 2011/65/EU and JEDEC J-STD-020C Level 1 moisture sensitivity. It withstands peak reflow temperatures up to 260°C and is qualified for standard Pb-free SAC305 profiles without delamination or parameter shift.
How does the bi-directional configuration affect PCB layout compared to unidirectional TVS diodes?
Bi-directional operation eliminates polarity marking and orientation dependency: the device functions identically regardless of terminal connection direction. This simplifies layout, reduces assembly errors, and avoids the need for silkscreen polarity indicators - especially beneficial in differential signal protection like CAN or RS-485 interfaces.
Can SMAJ12CA-13 be used in place of a unidirectional SMAJ12A-13 in existing designs?
No - SMAJ12CA-13 is bi-directional while SMAJ12A-13 is unidirectional. Substitution requires verifying that reverse-polarity surge events exist in the application and that system-level grounding permits symmetric clamping. Unidirectional parts provide lower leakage below VRWM; bi-directional versions exhibit matched forward/reverse characteristics essential for AC-coupled or floating-rail protection.
SMAJ12CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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
SMAJ12CA-13 FAQ
1.How can I place an order for SMAJ12CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ12CA-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 SMAJ12CA-13 reliable?
The price and inventory of SMAJ12CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ12CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ12CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ12CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ12CA-13?
SMAJ12CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ12CA-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 SMAJ12CA-13?
For technical support, including SMAJ12CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ12CA-13 requirements.
6.How does Aetrix verify that SMAJ12CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ12CA-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 SMAJ12CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ12CA-13?
All SMAJ12CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ12CA-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 SMAJ12CA-13 part is unused and in its original packaging.
Return procedure for SMAJ12CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ12CA-13 Tags
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ESD9B5.0ST5G
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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onsemi
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Diodes Incorporated
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