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Diodes Incorporated SMAJ28A-13-F
- Part No.:
- SMAJ28A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28A-13-F.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:527,874
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Product details
Overview
SMAJ28A-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 28V reverse standoff voltage (VRWM), 31.1–34.4V breakdown range (VBR), 45.4V maximum clamping voltage (VC) at 8.8A peak pulse current (IPP), and operates across –55°C to +150°C. Used in automotive body control modules to protect CAN transceiver power rails from load dump and ISO 7637-2 pulses.
For engineers reviewing the SMAJ28A-13-F datasheet, SMAJ28A-13-F pinout, SMAJ28A-13-F application, or SMAJ28A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMA package thermal dissipation limits, and compliance with AEC-Q101 for automotive-grade reliability.
Technical Context
This TVS diode employs glass-passivated junction construction for stable breakdown behavior and fast response (<1 ns) to transient events. Its unidirectional configuration enables asymmetric clamping-blocking reverse leakage below VRWM while conducting forward surge current up to 40A (IFSM) during positive transients.
Thermal design relies on lead temperature derating: steady-state power dissipation drops from 1.0W at TL = +75°C to zero at TL = +150°C. Pulse power remains rated at 400W only when terminals are maintained at ambient temperature, per JEDEC test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single 8.3ms half-sine surges without failure under defined thermal conditions. |
| Reverse Standoff Voltage | 28V - Maximum continuous DC or RMS voltage before significant leakage; sets operating margin for 24V automotive systems. |
| Breakdown Voltage | 31.1–34.4V @ 1.0mA - Confirmed VBR window ensures reliable turn-on above normal operating voltage but below system damage threshold. |
| Clamping Voltage | 45.4V @ 8.8A IPP - Limits downstream voltage during worst-case surge, protecting 48V-tolerant ICs like CAN transceivers. |
| Leakage Current | ≤5.0µA @ 28V - Low IR minimizes standby power loss and avoids false triggering in high-impedance bias networks. |
| Operating Temperature | –55°C to +150°C - Validated junction temperature range supports under-hood and industrial control environments. |
Pinout & Package
Package: SMA (DO-214AC), molded plastic case with UL 94V-0 flammability rating, cathode band marking for unidirectional polarity identification. Weight: 0.064g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to protected line; conducts surge current to ground when clamping threshold exceeded. |
| Cathode | Reference/ground connection | Connected to system ground plane; establishes clamping reference and enables unidirectional blocking of reverse voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Ensures stable VBR over lifetime and humidity exposure, critical for automotive field reliability. |
| 400W peak pulse rating | Meets ISO 7637-2 Pulse 5a (load dump) requirements for 12V/24V vehicle electrical systems. |
| Lead-free, RoHS-compliant plating | Matte tin finish meets MIL-STD-202 solderability standards and eliminates Pb-based assembly concerns. |
| Moisture sensitivity Level 1 | Allows unlimited floor life before reflow, eliminating bake requirements in standard SMT production. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 24V battery-fed ECU power input subjected to load dump transients up to 60V/100ms. IC Role / Device Role / Timing Role: Primary clamping device placed upstream of DC-DC converter input to limit voltage excursion. Use Value: Clamps to ≤45.4V within nanoseconds, preventing overvoltage shutdown or latch-up in buck controller ICs. |
Use Scenario: 4–20mA current loop transmitter exposed to induced surges from nearby motor drives. IC Role / Device Role / Timing Role: Line-side TVS shunting surge energy before it reaches precision op-amp and ADC front-end. Use Value: Low 5.0µA leakage avoids offset error in µA-level loop current sensing circuits. |
| Telecom DC Feeder Protection | Consumer Power Adapter Output Protection |
Use Scenario: -48V telecom central office power feed encountering lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to negative rail, suppressing positive-going transients on the feed line. Use Value: 31.1–34.4V VBR provides 10–15V margin above nominal -48V, avoiding false conduction during ripple. |
Use Scenario: USB-C PD adapter 20V output line vulnerable to hot-plug overshoot and cable ESD events. IC Role / Device Role / Timing Role: Secondary overvoltage clamp after primary regulation, safeguarding connected devices. Use Value: 45.4V VC ensures downstream 20V-rated USB-PD controllers remain within absolute maximum ratings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28CA-13-F | Bidirectional version with identical VRWM, VBR, and VC specs; symmetrical clamping for AC-coupled or floating lines. | Required where both polarities of transient must be suppressed (e.g., RS-485 data lines). | Select if protecting bidirectional signals; avoid for DC power rails where unidirectional blocking is needed. |
| SMBJ28A-13-F | Same electrical specs but SMB package (higher PM(AV) = 1.5W, larger thermal mass, 5.3mm x 4.6mm vs SMA's 4.6mm x 2.9mm). | Better suited for higher average power dissipation or manual rework scenarios due to larger pad area. | Choose when board layout allows larger footprint and thermal management requires >1.0W steady-state capability. |
Compared with SMAJ28CA-13-F, this unidirectional variant offers lower leakage and simpler grounding; versus SMBJ28A-13-F, it trades thermal robustness for space-constrained layouts where 1.0W steady-state dissipation suffices.
Availability
SMAJ28A-13-F is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor nodes, telecom power feeds, and consumer power adapters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMAJ28A-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and product qualification to AEC-Q101.
The SMAJ series targets automotive and industrial transient suppression, engineered for robustness against ISO 7637-2 and IEC 61000-4-5 threats in space- and cost-constrained surface-mount designs.
FAQ
What is the maximum clamping voltage for SMAJ28A-13-F under standard test conditions?
The maximum clamping voltage (VC) is 45.4V at 8.8A peak pulse current (IPP), measured using a 10/1000µs waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMAJ28A-13-F meet automotive qualification standards?
Yes - the SMAJ28A-13-F is qualified to AEC-Q101 for stress testing including HTGB, TCT, and HAST. It is manufactured in IATF 16949-certified facilities and supports PPAP documentation. The automotive-grade variant SMAJ28AQ-13-F is available under a separate datasheet for full AEC-Q200 system-level compliance.
How does the SMA package affect thermal performance in continuous operation?
At TL = +75°C, the SMA package supports 1.0W steady-state power dissipation (PM(AV)), derating linearly to zero at +150°C. Its small size limits heat spreading, so PCB copper area and via count beneath the cathode pad are critical to maintain safe junction temperatures in sustained overvoltage conditions.
Can SMAJ28A-13-F be used in bidirectional signal lines like RS-485?
No - SMAJ28A-13-F is unidirectional and will conduct continuously if reverse-biased beyond its forward voltage (~3.5V). For RS-485 or other AC-coupled interfaces, use the bidirectional SMAJ28CA-13-F, which clamps symmetrically for both polarities without forward conduction.
SMAJ28A-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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 45.4V
- Current - Peak Pulse (10/1000µs):
- 8.8A
- 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
SMAJ28A-13-F FAQ
1.How can I place an order for SMAJ28A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28A-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 SMAJ28A-13-F reliable?
The price and inventory of SMAJ28A-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 SMAJ28A-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ28A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28A-13-F?
SMAJ28A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28A-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 SMAJ28A-13-F?
For technical support, including SMAJ28A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28A-13-F requirements.
6.How does Aetrix verify that SMAJ28A-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ28A-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 SMAJ28A-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ28A-13-F?
All SMAJ28A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28A-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 SMAJ28A-13-F part is unused and in its original packaging.
Return procedure for SMAJ28A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28A-13-F 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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Diodes Incorporated
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