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Diodes Incorporated SMAJ28AQ-13-F
- Part No.:
- SMAJ28AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ28AQ-13-F.pdf
- Description:
- TVS DIODE 28VWM 45.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:19,181
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Product details
Overview
SMAJ28AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 28V reverse standoff voltage, 45.4V max clamping voltage at 8.8A peak pulse current, and AEC-Q101 qualification for under-hood and powertrain applications. It protects CAN/LIN bus lines and 12V/24V power rails against ISO7637-2 Pulse 1 (–100V), Pulse 2a (+50V), Pulse 3a (–150V), and ISO10605 ESD events.
For engineers reviewing the SMAJ28AQ-13-F datasheet, SMAJ28AQ-13-F pinout, SMAJ28AQ-13-F application, or SMAJ28AQ-13-F equivalent, this page delivers verified electrical parameters, AEC-Q101 compliance evidence, clamping performance under standardized surge waveforms, and direct-fit alternatives for automotive ECU, body control module, and ADAS sensor interface protection.
Technical Context
This TVS diode employs glass-passivated silicon junction construction to achieve low leakage (<0.5µA @ 28V), fast response time (<1.0ps), and stable clamping across –55°C to +175°C junction temperature. Its unidirectional polarity enables asymmetric surge suppression on DC-biased lines such as battery-fed microcontroller I/O or LIN transceiver inputs.
The device meets ISO7637-2 Pulse 1 (inductive load dump), Pulse 2a (load disconnect), and Pulse 3a/3b (switching transients) requirements when used with appropriate series impedance. Clamping occurs at 45.4V under 10×1000µs waveform, limiting voltage stress on downstream 3.3V/5V logic and analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains 10×1000µs surges up to 8.8A without failure |
| Reverse Standoff Voltage (VRWM) | 28V - blocks normal 12V/24V system operation while remaining inactive |
| Max Clamping Voltage (VC) | 45.4V @ IPP = 8.8A - limits transient overvoltage to safe level for 3.3V/5V ICs |
| Breakdown Voltage (VBR) | 31.1–34.4V @ IT = 1.0mA - ensures reliable turn-on before damage threshold of protected circuit |
| Leakage Current (IR) | <0.5µA @ VRWM - negligible standby power loss in always-on automotive modules |
| AEC-Q101 Qualified | Yes - validated for automotive use including temperature cycling, HTRB, and ESD testing |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing; cathode band denotes polarity; weight ≈0.064g; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; defines clamping reference point |
| Cathode | Protected line input | Connected to signal/power line being safeguarded; conducts surge current to anode during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die | Enables stable VBR and low IR over lifetime, critical for 15-year automotive service life |
| 400W peak pulse rating | Handles ISO7637-2 Pulse 1 (–100V, 50Ω source) without degradation |
| AEC-Q101 qualification | Validated for PPAP submission and IATF 16949 production environments |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); <900ppm Br, <900ppm Cl, <1000ppm Sb |
Applications
| Body Control Module (BCM) | Powertrain Control Unit (PCU) |
|---|---|
Use Scenario: Protecting LIN bus transceiver pins from load-dump-induced transients during door actuator switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between LIN PHY and connector, referenced to chassis ground. Use Value: Limits voltage excursion to ≤45.4V, preventing latch-up or gate oxide rupture in 5V-tolerant transceivers. |
Use Scenario: Safeguarding 12V supply input to engine ECU microcontroller during alternator field collapse. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail upstream of LDO regulators. Use Value: Absorbs 400W pulse energy within 10×1000µs window, maintaining downstream rail integrity below 5.5V. |
| ADAS Camera Module | Electric Power Steering (EPS) |
Use Scenario: Shielding MIPI CSI-2 data lines from ESD events during assembly and field service. IC Role / Device Role / Timing Role: Low-capacitance TVS on differential pair, grounded via short trace to shield plane. Use Value: Sub-1pF junction capacitance preserves signal integrity at 1.5Gbps while passing ±30kV contact discharge. |
Use Scenario: Suppressing commutation spikes on motor phase drivers in EPS torque assist circuits. IC Role / Device Role / Timing Role: Parallel clamp across H-bridge high-side FET drain-source nodes. Use Value: Clamps inductive kickback to ≤45.4V, reducing MOSFET VDS stress and enabling smaller RDS(on) selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ28A-13-F | No AEC-Q101 qualification; same electrical specs and package | Not approved for automotive PPAP; suitable for industrial or consumer designs | Select only if AEC-Q101 is not required and cost sensitivity outweighs qualification assurance |
| SMCJ28A-Q | Higher 1500W rating; DO-214AB (SMC) package; 2.5× larger footprint | Used where higher surge margin is needed (e.g., alternator output lines) | Choose when system-level surge testing exceeds 400W or board space permits larger package |
Compared with SMAJ28AQ-13-F, SMAJ28A-13-F lacks automotive qualification documentation and process controls, while SMCJ28A-Q trades compactness for higher robustness-making the AQ variant optimal for space-constrained, PPAP-mandated ECUs.
Availability
SMAJ28AQ-13-F is available at Aetrix Electronics and suitable for automotive electronic control units, body electronics modules, and ADAS sensor interfaces requiring stable component supply with full AEC-Q101 traceability and IATF 16949 manufacturing evidence.
Supply support for SMAJ28AQ-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 integrated circuits, specializing in high-reliability components for automotive, industrial, and computing markets.
This device belongs to Diodes' AEC-Q101-qualified SMAJ-AQ series, engineered specifically for automotive transient suppression in harsh environments-including under-hood, powertrain, and infotainment systems-where long-term reliability and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of SMAJ28AQ-13-F under ISO7637-2 Pulse 1 conditions?
The maximum clamping voltage is 45.4V at 8.8A peak pulse current, measured using the standard 10×1000µs waveform. This value is guaranteed across –55°C to +175°C and ensures protected ICs remain within absolute maximum ratings during worst-case load-dump events.
Does SMAJ28AQ-13-F require external series impedance for effective protection?
Yes-optimal protection requires a current-limiting resistor or ferrite bead between the TVS and protected IC. For LIN bus, a 10Ω resistor limits peak current to safe levels; for 12V power rails, a 100mΩ sense resistor provides both current limiting and fault detection capability.
How does the glass-passivated die improve long-term reliability in automotive applications?
Glass passivation prevents moisture ingress and metal migration at the silicon surface, eliminating parametric drift and early-life failures under thermal cycling and humidity exposure. Diodes' AQ-series devices demonstrate <0.1% parameter shift after 1000 hours at 150°C, meeting AEC-Q101 HTRB requirements.
Can SMAJ28AQ-13-F be used in bi-directional signal lines like CAN H/L?
No-SMAJ28AQ-13-F is unidirectional and unsuitable for symmetric AC-coupled buses. For CAN, use SMAJ28CAQ-13-F (bi-directional version), which features matched clamping in both polarities and maintains signal symmetry during ESD events.
SMAJ28AQ-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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ28AQ-13-F FAQ
1.How can I place an order for SMAJ28AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ28AQ-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 SMAJ28AQ-13-F reliable?
The price and inventory of SMAJ28AQ-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 SMAJ28AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ28AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ28AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ28AQ-13-F?
SMAJ28AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ28AQ-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 SMAJ28AQ-13-F?
For technical support, including SMAJ28AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ28AQ-13-F requirements.
6.How does Aetrix verify that SMAJ28AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ28AQ-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 SMAJ28AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ28AQ-13-F?
All SMAJ28AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ28AQ-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 SMAJ28AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ28AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ28AQ-13-F Tags
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Diodes Incorporated
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