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Diodes Incorporated SMAJ24CA-13
- Part No.:
- SMAJ24CA-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24CA-13.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:7,081
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Product details
Overview
SMAJ24CA-13 from Diodes Incorporated is a bi-directional 400W surface-mount transient voltage suppressor (TVS) diode designed for clamping ESD and surge transients on data lines and power rails. It features a 24V reverse standoff voltage (VRWM), 26.7–29.5V breakdown range (VBR @ 1mA), 38.9V max clamping voltage (VC) at 10.3A peak pulse current (IPP), and operates from –55°C to +150°C - used in industrial I/O protection and automotive body control modules.
For engineers reviewing the SMAJ24CA-13 datasheet, SMAJ24CA-13 pinout, SMAJ24CA-13 application, or SMAJ24CA-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC, bidirectional capability for AC-coupled interfaces, JEDEC-compliant 8.3ms surge rating, and RoHS-compliant matte tin termination for lead-free reflow.
Technical Context
This bi-directional TVS uses glass-passivated junction construction for stable breakdown and fast response (<1 ps), enabling effective suppression of ESD (IEC 61000-4-2 Level 4) and lightning-induced surges (IEC 61000-4-5). Its symmetrical clamping behavior protects both polarities of AC signals without polarity biasing.
The device complies with JEDEC Method for 8.3ms half-sine surge testing, delivers 400W non-repetitive peak pulse power at TA = 25°C, and derates linearly above ambient - maintaining 200W capability at 75°C ambient per Fig. 1. Steady-state dissipation is limited to 1.0W at TL = 75°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400 W - sustains single 8.3ms surge events without failure under defined thermal conditions |
| Reverse Standoff Voltage (VRWM) | 24 V - maximum continuous DC or RMS voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 26.7–29.5 V @ 1 mA - ensures reliable turn-on before protected circuit exceeds absolute max ratings |
| Max Clamping Voltage (VC) | 38.9 V @ IPP = 10.3 A - defines worst-case voltage seen by downstream IC during surge |
| Peak Pulse Current (IPP) | 10.3 A - peak current handled at VC, directly tied to system-level surge test compliance |
| Operating Temperature | –55°C to +150°C - supports under-hood automotive and industrial environments |
| Leakage Current (IR) | 5.0 µA @ VRWM - low standby loss critical for battery-powered sensor nodes |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating; cathode band omitted due to bi-directional configuration; terminals solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Bi-directional terminals clamp voltage regardless of polarity - no orientation required during placement |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR over temperature and lifetime, minimizing parameter drift in harsh environments |
| 400W peak pulse rating | Meets IEC 61000-4-5 Level 3 (1kV/2Ω) surge immunity requirements for industrial ports |
| RoHS-compliant matte tin finish | Enables compatibility with Pb-free reflow profiles (peak 260°C) without solder joint degradation |
| Low clamping ratio (VC/VBR ≈ 1.45) | Provides tighter voltage margin between clamping and protected IC's absolute maximum rating |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protects RS-485 transceivers and analog input channels against induced surges from relay switching and motor noise. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential bus lines or supply-to-ground. Use Value: Limits transient voltage to ≤38.9V, preventing latch-up or gate oxide damage in 3.3V/5V interface ICs. |
Use Scenario: Shields LIN bus transceivers and microcontroller GPIOs from load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on 12V power rail and signal lines entering BCM housing. Use Value: Withstands 10.3A pulses while maintaining <5µA leakage, preserving sleep-mode current budget. |
| USB Port ESD Protection | Smart Meter Communication Interface |
Use Scenario: Guards USB 2.0 D+/D− lines against contact ESD per IEC 61000-4-2 ±15kV air/±8kV contact discharge. IC Role / Device Role / Timing Role: Low-capacitance bi-directional clamp placed immediately at connector entry point. Use Value: Sub-100pF junction capacitance minimizes signal integrity impact on 480Mbps high-speed data paths. |
Use Scenario: Secures HPLC (power line communication) and RF (sub-GHz) modem interfaces in utility meters exposed to grid surges. IC Role / Device Role / Timing Role: Secondary protection stage after gas discharge tube (GDT), absorbing residual energy. Use Value: 400W rating handles multi-pulse surge events common in distribution transformer switching environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA-13 | Same VRWM and VC, but 600W PPK rating in larger SMB package (DO-214AA) | Better suited for higher-energy surges; requires more PCB area and has higher thermal mass | Select when system-level surge tests exceed 400W or when board layout allows larger footprint |
| SMCJ24CA-13 | Same VRWM and VC, but 1500W PPK rating in SMC package (DO-214AB) | Designed for primary protection in telecom power feeds and EV charging interfaces | Choose for front-end protection where GDT or fuse coordination is required upstream |
Compared with SMBJ24CA-13 and SMCJ24CA-13, SMAJ24CA-13 offers optimal balance of surge robustness, compact size, and cost for secondary protection in space-constrained industrial and automotive ECUs - avoiding over-engineering while meeting IEC 61000-4-2/4-5 compliance.
Availability
SMAJ24CA-13 is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, USB port ESD hardening, and smart meter communication interfaces requiring stable component supply and long-term lifecycle support.
Supply support for SMAJ24CA-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 suppressor portfolio, engineered specifically for high-reliability, surface-mount surge protection in automotive, industrial, and consumer electronics where compact size and repeatable clamping performance are critical.
FAQ
Is SMAJ24CA-13 unidirectional or bi-directional?
SMAJ24CA-13 is bi-directional, indicated by the "C" suffix in the part number per Diodes' datasheet Note 5. It provides symmetrical clamping for both positive and negative transients without polarity sensitivity, making it ideal for AC-coupled lines like RS-485 or LIN bus.
What is the maximum clamping voltage at rated peak pulse current?
The maximum clamping voltage (VC) is 38.9 V at 10.3 A peak pulse current (IPP), measured under the standardized 8.3ms half-sine waveform per JEDEC Method. This value is guaranteed across the full operating temperature range and represents the worst-case voltage imposed on protected circuitry.
Does SMAJ24CA-13 meet RoHS requirements?
Yes - SMAJ24CA-13 features a matte tin finish and complies with RoHS Directive 2011/65/EU, including exemptions for high-temperature solder and glass. The "-13" suffix denotes tape-and-reel packaging compatible with automated SMT assembly.
Can SMAJ24CA-13 be used in place of SMAJ24A-13?
No - SMAJ24A-13 is unidirectional and lacks clamping capability for negative transients. Replacing it with SMAJ24CA-13 introduces symmetrical protection but may alter circuit behavior in DC-biased applications; verify bias network compatibility and ensure no unintended forward conduction occurs during normal operation.
SMAJ24CA-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):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 38.9V
- Current - Peak Pulse (10/1000µs):
- 10.3A
- 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)
SMAJ24CA-13 FAQ
1.How can I place an order for SMAJ24CA-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24CA-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 SMAJ24CA-13 reliable?
The price and inventory of SMAJ24CA-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24CA-13 is usually 5 days.
3.What payment methods are accepted for SMAJ24CA-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24CA-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24CA-13?
SMAJ24CA-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24CA-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 SMAJ24CA-13?
For technical support, including SMAJ24CA-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24CA-13 requirements.
6.How does Aetrix verify that SMAJ24CA-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ24CA-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 SMAJ24CA-13 meets industry standards.
7.What is the process for return or replacement of SMAJ24CA-13?
All SMAJ24CA-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24CA-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 SMAJ24CA-13 part is unused and in its original packaging.
Return procedure for SMAJ24CA-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24CA-13 Tags
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ESD9B5.0ST5G
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Diodes Incorporated
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