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Diodes Incorporated SMAJ24A-13
- Part No.:
- SMAJ24A-13
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A-13.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:3,463
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Product details
Overview
SMAJ24A-13 from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 24V reverse standoff voltage (VRWM), 26.7–29.5V breakdown range (VBR @ 1mA), 38.9V max clamping voltage at 10.3A peak pulse current (IPP), and operates from –55°C to +150°C. Used in automotive infotainment power inputs and industrial PLC I/O protection.
For engineers reviewing the SMAJ24A-13 datasheet, SMAJ24A-13 pinout, SMAJ24A-13 application, or SMAJ24A-13 equivalent, key selection criteria include clamping voltage margin vs. protected IC VCC tolerance, peak pulse current handling under ISO 7637-2 Pulse 1/2a, unidirectional polarity alignment with DC rail topology, and SMA package thermal performance under sustained surge duty cycles.
Technical Context
This TVS diode employs a glass-passivated silicon junction optimized for fast response (<1 ps) to transient events such as ESD (IEC 61000-4-2), EFT (IEC 61000-4-4), and surge (IEC 61000-4-5). Its unidirectional configuration provides low-leakage reverse blocking below VRWM while enabling robust forward conduction during positive transients.
The device is rated for 400W non-repetitive peak pulse power (8.3ms half-sine waveform), with derating above 25°C ambient per Fig. 1 and steady-state dissipation of 1.0W at TL = 75°C. Clamping performance is specified at IPP = 10.3A, ensuring predictable voltage limiting during standardized surge tests.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 8.3ms surges up to this level without failure |
| Reverse Standoff Voltage (VRWM) | 24V - Maximum continuous DC voltage before significant leakage begins |
| Breakdown Voltage (VBR) | 26.7–29.5V @ 1mA - Confirmed avalanche onset range for design margining |
| Max Clamping Voltage (VC) | 38.9V @ IPP = 10.3A - Upper bound of protected line voltage during worst-case surge |
| Peak Pulse Current (IPP) | 10.3A - Surge current level at which VC is guaranteed; used for IEC 61000-4-5 Level 3 validation |
| Operating Temperature | –55°C to +150°C - Validated junction temperature range for under-hood and industrial environments |
| Package | SMA (DO-214AC) - Standardized surface-mount outline with 5.59mm max body length and 2.30mm max width |
Pinout & Package
SMA (DO-214AC) package: molded plastic case, UL 94V-0 rated, cathode band marking, 0.064g typical weight. Terminals are solderable per MIL-STD-202, Method 208.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path for positive surges | Connected to ground or low-impedance return when protecting positive rail |
| Cathode | Protected line connection | Connected to DC supply or signal line; polarity defines unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables compliance with ISO 7637-2 Pulse 1 (inductive load dump) in 12V systems |
| Glass-Passivated Die | Ensures stable VBR and low parameter drift across temperature and lifetime |
| Fast Response Time | <1 ps junction response enables effective suppression of ESD events before IC damage occurs |
| RoHS-Compliant Matte Tin Finish | Supports lead-free reflow assembly without solderability degradation or whisker risk |
| Low Reverse Leakage | <5 µA @ 24V ensures minimal standby power loss in always-on circuits |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface |
|---|---|
Use Scenario: 12V battery-fed infotainment head unit exposed to load dump transients per ISO 7637-2. IC Role / Device Role: Primary clamping device on main DC input rail upstream of DC-DC converters. Use Value: Limits voltage to ≤38.9V during 10.3A surges, preventing overvoltage shutdown or latch-up in PMICs. | Use Scenario: 24V analog sensor signal line (e.g., 4–20mA loop) routed through noisy factory floor wiring. IC Role / Device Role: Point-of-entry transient shunt on signal line before precision amplifier input. Use Value: Clamps fast-rising EFT bursts to <39V while adding only ~20pF capacitance, preserving signal integrity. |
| Telecom PoE Port Protection | Medical Equipment DC Rail Guard |
Use Scenario: Secondary-side 24V output of IEEE 802.3af/at PoE midspan injector. IC Role / Device Role: Unidirectional TVS placed between PSE output and powered device interface. Use Value: Absorbs induced surges from cable coupling without affecting normal 24V DC delivery due to low IR. | Use Scenario: 5V/3.3V logic rail in portable diagnostic device subject to ESD per IEC 60601-1-2. IC Role / Device Role: Final-stage clamping element adjacent to microcontroller VDD pins. Use Value: Responds in <1 ps to ±8kV contact ESD, clamping to <39V to avoid latch-up or gate oxide rupture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A-TP from Microchip | Same VRWM (24V), slightly higher VC (39.4V @ 10.2A); JEDEC-compliant but no RoHS-F suffix standard | Valid for legacy designs requiring Microchip qualification; identical footprint | Select if sourcing from Microchip-qualified supply chain or requiring extended temp screening |
| P6SMB24A from ON Semiconductor | Same SMA package, 24V VRWM, but lower PPK (600W), higher IPP (24.9A), and higher VC (38.9V same) | Better suited for higher-energy surges where peak current exceeds 10.3A but clamping voltage budget allows | Choose when system-level surge testing requires >10A IPP margin and board layout permits same footprint |
Compared with SMAJ24A-13, SMAJ24A-TP offers equivalent clamping but less RoHS flexibility, while P6SMB24A trades tighter VC control for higher surge current capacity-making it preferable for harsher surge environments where clamping voltage margin is sufficient.
Availability
SMAJ24A-13 is available at Aetrix Electronics and suitable for automotive power input protection, industrial sensor interface hardening, and medical equipment DC rail guard requiring stable component supply across multi-year production cycles.
Supply support for SMAJ24A-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, specializing in high-reliability protection, power management, and signal integrity solutions for automotive, industrial, and computing markets.
The SMAJ series belongs to Diodes' transient voltage suppressor product line, engineered specifically for robust, surface-mount overvoltage protection in space-constrained, high-surge environments with stringent AEC-Q200 alignment.
FAQ
Is SMAJ24A-13 unidirectional or bidirectional?
SMAJ24A-13 is unidirectional, indicated by the absence of the "C" suffix. It conducts only during positive transients relative to its cathode terminal and blocks reverse voltage up to 24V. Bidirectional variants (e.g., SMAJ24CA-13) omit the polarity indicator and clamp both polarities.
What is the maximum clamping voltage at 5A peak pulse current?
Per the datasheet's clamping curve (Fig. 3), the typical clamping voltage at 5A is approximately 32V. The guaranteed maximum remains 38.9V only at the rated 10.3A IPP; lower currents yield proportionally lower VC due to the TVS's dynamic resistance characteristic.
Can SMAJ24A-13 be used in place of SMAJ22A-13 for tighter voltage margin?
No-substituting SMAJ24A-13 for SMAJ22A-13 increases VRWM by 2V and raises clamping voltage to 38.9V (vs. 35.5V), potentially exceeding the protected IC's absolute maximum rating. Always verify VCC tolerance and surge test margin before changing VRWM grade.
Does SMAJ24A-13 meet AEC-Q200 requirements?
SMAJ24A-13 is not AEC-Q200 qualified per Diodes' official documentation. For automotive-grade applications requiring qualification, consider Diodes' AEC-Q200-certified PUSB3FR series or consult Diodes' Automotive Product Selector Guide for Q200-listed TVS alternatives with matching VRWM.
SMAJ24A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMAJ24A-13 FAQ
1.How can I place an order for SMAJ24A-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A-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 SMAJ24A-13 reliable?
The price and inventory of SMAJ24A-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ24A-13 is usually 5 days.
3.What payment methods are accepted for SMAJ24A-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A-13?
SMAJ24A-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A-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 SMAJ24A-13?
For technical support, including SMAJ24A-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A-13 requirements.
6.How does Aetrix verify that SMAJ24A-13 is sourced from the original manufacturer or authorized distributors?
All SMAJ24A-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 SMAJ24A-13 meets industry standards.
7.What is the process for return or replacement of SMAJ24A-13?
All SMAJ24A-13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A-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 SMAJ24A-13 part is unused and in its original packaging.
Return procedure for SMAJ24A-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24A-13 Tags
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