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Diodes Incorporated SMAJ24A-13-F
- Part No.:
- SMAJ24A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ24A-13-F.pdf
- Description:
- TVS DIODE 24VWM 38.9VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:279,595
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Product details
Overview
SMAJ24A-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power lines and signal interfaces. It features a 24V reverse standoff voltage (VRWM), 26.7–29.5V breakdown range (VBR), 38.9V max clamping voltage (VC) at 10.3A peak pulse current (IPP), and SMA package with cathode band polarity marking.
For engineers reviewing the SMAJ24A-13-F datasheet, SMAJ24A-13-F pinout, SMAJ24A-13-F application, or SMAJ24A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity for DC rail protection, RoHS-compliant lead-free plating, and compatibility with automated SMT assembly on industrial and automotive PCBs.
Technical Context
This TVS diode operates as a fast-acting shunt protector, triggering when transient voltage exceeds its breakdown threshold to clamp downstream circuitry within safe limits. Its glass-passivated die ensures stable VBR tolerance and low leakage (<5µA at VRWM), while the SMA package supports thermal dissipation up to 1.0W at TL = +75°C.
The device responds to transients in <1ps and handles non-repetitive 8.3ms half-sine surges up to 40A (IFSM), with pulse power derated linearly above +25°C ambient. It is rated for operation from –55°C to +150°C junction temperature and meets J-STD-020 moisture sensitivity Level 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 8.3ms surge without failure; defines maximum transient energy absorption capability |
| Reverse Standoff Voltage (VRWM) | 24V - maximum continuous DC or RMS voltage the device blocks before clamping begins |
| Breakdown Voltage (VBR) | 26.7–29.5V @ IT = 1.0mA - precise conduction onset window ensuring reliable turn-on margin above VRWM |
| Clamping Voltage (VC) | 38.9V @ IPP = 10.3A - maximum voltage seen by protected circuit during specified surge condition |
| Peak Pulse Current (IPP) | 10.3A - peak current the device safely diverts at VC; derived from PPK / VC relationship |
| Leakage Current (IR) | <5µA @ VRWM - minimal parasitic loading on 24V supply rails during normal operation |
| Package | SMA - standardized surface-mount outline (4.0–4.6mm length, 2.29–2.92mm width) compatible with IPC-7351B footprints |
Pinout & Package
Two-terminal unidirectional TVS diode in SMA package. Cathode band denotes terminal 1 (anode = terminal 2). No internal circuitry-functions as voltage-triggered shunt element between terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 (Cathode Band) | Protected Circuit Return / Ground Reference | Connected to system ground or low-impedance return path; carries full surge current during clamping |
| Terminal 2 (Anode) | Line-Side Surge Entry Point | Connected to input line (e.g., 24V rail); voltage rise above VBR causes avalanche conduction to Terminal 1 |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against IEC 61000-4-5 Level 3 (1kV/2Ω) surges on 24V industrial buses |
| Glass Passivated Die | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| Lead-Free & Halogen-Free | Meets RoHS 3 (2015/863/EU) and JEDEC JS709C green standards; suitable for automotive and medical end-equipment |
| Fast Response Time | <1ps turn-on enables clamping before sensitive ICs (e.g., CAN transceivers, microcontrollers) experience overstress |
| SMA Package Thermal Performance | 1.0W steady-state dissipation at TL = +75°C supports reliable operation in enclosed industrial enclosures |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Modules |
|---|---|
|
Use Scenario: 24V DC input protection for digital input channels exposed to load dump and inductive switching noise. IC Role / Device Role: Primary shunt TVS placed upstream of optocoupler or Schmitt trigger input conditioning stage. Use Value: Clamps transients to ≤38.9V, preventing damage to 3.3V/5V logic interface ICs while maintaining <5µA standby leakage. |
Use Scenario: Protection of LIN bus transceiver power pins against battery line disturbances during cold-cranking and jump-start events. IC Role / Device Role: Unidirectional TVS on VCC pin of LIN transceiver IC (e.g., TJA1020) referenced to chassis ground. Use Value: Withstands 10.3A surge at 38.9V clamping, meeting ISO 7637-2 Pulse 1/2a immunity requirements for 12V/24V systems. |
| Telecom Power Feeds | Medical Equipment DC Supplies |
|
Use Scenario: Overvoltage suppression on -48V telecom rectifier outputs feeding remote radio units. IC Role / Device Role: Reverse-polarity configured TVS (cathode to -48V, anode to ground) protecting downstream DC-DC converters. Use Value: 24V VRWM and 38.9V VC ensure safe operation across -36V to -72V nominal range while limiting fault voltage to safe levels. |
Use Scenario: Secondary-side surge protection on isolated 24V auxiliary supplies powering patient-connected sensors and analog front-ends. IC Role / Device Role: Final-stage TVS on post-isolation 24V rail, placed immediately before LDO regulators feeding ADCs and amplifiers. Use Value: Low leakage (<5µA) avoids offset drift in precision analog circuits; SMA footprint allows placement near sensitive analog sections. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24AHE3_A/H (Vishay) | Same VRWM (24V), slightly higher VC (40.0V @ 10.3A); identical SMA package and RoHS compliance | Marginally higher clamping increases risk of downstream overvoltage in tight-margin 24V systems | Select if Vishay supply chain preference exists; verify VC margin against protected IC absolute maximum ratings |
| 1.5SMC24A (ON Semiconductor) | Higher PPK (1500W), larger SMC package (7.1mm x 6.2mm); same VRWM/VC specs but different thermal profile | Not drop-in: requires PCB redesign due to 2.5× larger footprint and higher mounting height | Choose only when 400W is insufficient and board space permits SMC; avoid for space-constrained 24V modules |
Compared with SMAJ24A-13-F, the Vishay alternative offers identical electrical protection but with less clamping margin, while the ON Semiconductor part delivers higher surge capacity at the cost of mechanical incompatibility-making the Diodes device optimal for compact, cost-sensitive 24V industrial designs requiring proven SMA integration.
Availability
SMAJ24A-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and telecom power feed applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for SMAJ24A-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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
SMAJxxA is part of Diodes' transient voltage suppressor product line, engineered specifically for high-reliability DC power line and interface protection in industrial automation, automotive electronics, and communications infrastructure.
FAQ
What is the polarity configuration of SMAJ24A-13-F?
SMAJ24A-13-F is a unidirectional TVS diode with cathode band marking indicating Terminal 1. It conducts only when the anode is ~27V more positive than the cathode, making it suitable for protecting positive DC rails. Bidirectional variants use the "C" suffix (e.g., SMAJ24CA-13-F) and lack polarity marking.
Can SMAJ24A-13-F be used in automotive applications?
Yes-SMAJ24A-13-F meets RoHS 3 and halogen-free requirements, and its -55°C to +150°C operating range supports under-hood environments. For AEC-Q101 qualified versions, Diodes offers the automotive-grade SMAJ24AQ-13-F, which undergoes additional stress testing and PPAP documentation.
How does the SMA package affect thermal performance?
The SMA package has a thermal resistance of approximately 120°C/W junction-to-ambient (typical), limiting steady-state power dissipation to 1.0W at TL = +75°C. For repeated surge events, PCB copper area and thermal vias must be optimized per Diodes' recommended pad layout to maintain TJ ≤ +150°C.
What is the test condition for the 38.9V clamping voltage specification?
The 38.9V clamping voltage (VC) is measured at a peak pulse current (IPP) of 10.3A using a 10/1000µs double-exponential waveform per IEC 61000-4-5, with device mounted on a standard FR-4 test board per JEDEC standards. This reflects worst-case clamping under defined surge conditions-not DC or AC operating voltage.
SMAJ24A-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):
- 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:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ24A-13-F FAQ
1.How can I place an order for SMAJ24A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ24A-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 SMAJ24A-13-F reliable?
The price and inventory of SMAJ24A-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 SMAJ24A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ24A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ24A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ24A-13-F?
SMAJ24A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ24A-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 SMAJ24A-13-F?
For technical support, including SMAJ24A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ24A-13-F requirements.
6.How does Aetrix verify that SMAJ24A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ24A-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 SMAJ24A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ24A-13-F?
All SMAJ24A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ24A-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 SMAJ24A-13-F part is unused and in its original packaging.
Return procedure for SMAJ24A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ24A-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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Diodes Incorporated
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