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Diodes Incorporated SMAJ20CA-13
- Part No.:
- SMAJ20CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ20CA-13.pdf
- Description:
- TVS DIODE 20VWM 32.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,827
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Product details
Overview
SMAJ20CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in DC power lines and signal interfaces. It features a 20V reverse standoff voltage (VRWM), 22.2–24.5V breakdown voltage (VBR) at 1mA, 32.4V maximum clamping voltage (VC) at 12.3A peak pulse current (IPP), and operates from –55°C to +150°C junction temperature.
For engineers reviewing the SMAJ20CA-13 datasheet, SMAJ20CA-13 pinout, SMAJ20CA-13 application, or SMAJ20CA-13 equivalent, key selection criteria include clamping performance under 8.3ms surge waveforms, bidirectional polarity tolerance, RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on PCBs requiring IEC 61000-4-2/4-4/4-5 level protection.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1ps) to transient events such as ESD, lightning-induced surges, and inductive switching spikes. Its bi-directional configuration enables symmetric clamping across both polarities without external polarity management.
The device delivers 400W peak pulse power dissipation (PPK) at TA = 25°C, derated linearly above ambient per Fig. 1, and supports steady-state power dissipation of 1.0W at TL = 75°C. It meets JEDEC-standard 8.3ms half-sine surge testing with IFSM = 40A and exhibits <5µA reverse leakage at VRWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surges up to 12.3A without failure |
| Reverse Standoff Voltage | 20V - maximum continuous DC or RMS voltage before clamping initiates |
| Breakdown Voltage | 22.2–24.5V @ 1mA - precise VBR window ensures reliable turn-on margin |
| Clamping Voltage | 32.4V @ 12.3A - limits downstream voltage stress during worst-case transients |
| Junction Temp Range | –55°C to +150°C - supports operation in automotive engine bays and industrial controls |
| Package | SMA (DO-214AC) - industry-standard 2-pin SMD footprint with 4.8–5.59mm body length |
| RoHS Compliance | Yes (lead-free matte tin finish) - meets EU Directive Annex exemptions per Note 4 |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case, UL 94V-0 rated, cathode band omitted (bi-directional).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode | Bi-directional terminal pair | No polarity distinction - either terminal serves as input or return path for transient energy |
| Case | Non-electrical mechanical interface | Thermally conductive plastic body aids heat dissipation during repetitive surges |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enhances long-term reliability and moisture resistance vs. epoxy-passivated alternatives |
| Fast response time | <1 ps - clamps before sensitive ICs experience voltage overshoot |
| 400W peak pulse rating | Supports high-energy surge immunity per IEC 61000-4-5 Level 4 (4kV) |
| Lead-free / RoHS compliant | Matte tin plating compatible with Pb-free reflow profiles and environmental compliance |
| JEDEC-standard surge rating | Validated for 40A IFSM (8.3ms half-sine), enabling use in AC line and motor drive inputs |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 24V digital input channels against load dump and inductive kickback in programmable logic controllers. IC Role / Device Role / Timing Role: Primary clamping element placed between field wiring and input buffer IC. Use Value: Limits transient voltage to ≤32.4V, preventing latch-up or damage to 3.3V/5V logic-level receivers. | Use Scenario: Safeguarding LIN bus transceivers and sensor interfaces from battery voltage transients during cold-cranking or alternator load dump. IC Role / Device Role / Timing Role: Bi-directional shunt protector on 12V supply rail feeding microcontroller peripherals. Use Value: Withstands 40A surge pulses while maintaining stable 20V standoff for uninterrupted communication. |
| USB Type-C Port ESD Protection | Smart Meter Power Input Stage |
Use Scenario: Secondary-level surge suppression on VBUS line upstream of USB PD controller and port protection ICs. IC Role / Device Role / Timing Role: Coordinated clamping partner to low-capacitance ESD arrays, handling higher-energy events. Use Value: 32.4V clamping prevents overvoltage stress on 20V-rated PD controllers during hot-plug surges. | Use Scenario: Front-end protection for 220VAC-derived 24V auxiliary supply in utility smart meters exposed to grid surges. IC Role / Device Role / Timing Role: First-stage TVS on isolated DC output prior to LDO regulation and meter SoC supply. Use Value: 400W rating absorbs multi-kV induced surges without degradation, ensuring 15+ year field life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20CA-13 | Same electrical specs but SMB (DO-214AA) package - 3.5mm wider, 0.5mm taller body | Lower power density; requires larger PCB area but offers higher thermal mass | Select when board layout allows larger footprint and enhanced thermal cycling endurance is prioritized |
| SMCJ20CA-13 | Same VRWM/VBR/VC but SMC (DO-214AB) package - 7.1mm x 6.2mm, 1500W PPK rating | Over-spec'd for 400W needs; used where legacy designs mandate SMC footprint or future-proofing required | Choose only if existing SMC pad layout exists or system-level surge requirements exceed 400W |
Compared with SMBJ20CA-13 and SMCJ20CA-13, SMAJ20CA-13 provides optimal balance of compact size, 400W capability, and cost efficiency for space-constrained 24V industrial and automotive modules where thermal mass is managed via copper pour.
Availability
SMAJ20CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, USB Type-C power delivery interfaces, and smart meter auxiliary supplies requiring stable component supply and full traceability.
Supply support for SMAJ20CA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with design and manufacturing operations across Asia, Europe, and the US.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for high-reliability, surface-mount surge protection in harsh-environment applications including automotive, industrial automation, and energy infrastructure.
FAQ
What is the meaning of the 'C' suffix in SMAJ20CA-13?
The 'C' denotes a bi-directional configuration, meaning the device clamps transient voltages symmetrically across both polarities without requiring orientation during placement. Unlike unidirectional variants (e.g., SMAJ20A-13), it has no cathode band marking and functions identically regardless of terminal connection direction.
Can SMAJ20CA-13 be used in place of a unidirectional TVS in a DC-only circuit?
Yes - SMAJ20CA-13 is fully functional in DC circuits, providing identical clamping performance as its unidirectional counterpart. The bi-directional construction adds no penalty in leakage, capacitance, or response time, and eliminates risk of incorrect orientation during assembly.
What is the maximum allowable PCB trace length between SMAJ20CA-13 and protected IC?
For effective ESD and surge suppression, keep the TVS-to-protected-device trace length under 5mm. Longer traces add inductance that degrades clamping speed; measured data shows >10mm traces increase clamped voltage by ≥15% during 1ns rise-time transients due to L·di/dt effects.
Does SMAJ20CA-13 meet IEC 61000-4-5 surge immunity standards?
Yes - its 400W peak pulse rating corresponds to IEC 61000-4-5 Level 4 (4kV line-to-earth, 2kV line-to-line) when applied with proper PCB layout and grounding. Full compliance requires validation in the final system, but the device's 32.4V clamping voltage at 12.3A is sufficient to protect most 24V-rated ICs under standard test waveforms.
SMAJ20CA-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 20V
- Voltage - Breakdown (Min):
- 22.2V
- Voltage - Clamping (Max) @ Ipp:
- 32.4V
- Current - Peak Pulse (10/1000µs):
- 12.3A
- 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)
SMAJ20CA-13 FAQ
1.How can I place an order for SMAJ20CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ20CA-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 SMAJ20CA-13 reliable?
The price and inventory of SMAJ20CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ20CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ20CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ20CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ20CA-13?
SMAJ20CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ20CA-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 SMAJ20CA-13?
For technical support, including SMAJ20CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ20CA-13 requirements.
6.How does Aetrix verify that SMAJ20CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ20CA-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 SMAJ20CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ20CA-13?
All SMAJ20CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ20CA-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 SMAJ20CA-13 part is unused and in its original packaging.
Return procedure for SMAJ20CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ20CA-13 Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
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Diodes Incorporated
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