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Diodes Incorporated SMAJ85AQ-13-F
- Part No.:
- SMAJ85AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ85AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR PP
- Quantity:
- Payment:
- Shipping:
Inventory:9,885
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Product details
Overview
SMAJ85AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 85V reverse standoff voltage, 137V max clamping voltage at 2.9A peak pulse current, and AEC-Q101 qualification for under-hood electronics. It protects LIN bus interfaces, body control modules, and power supply inputs against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ85AQ-13-F datasheet, SMAJ85AQ-13-F pinout, SMAJ85AQ-13-F application, or SMAJ85AQ-13-F equivalent, this page delivers verified electrical parameters, automotive-grade reliability context, clamping performance under standardized surge waveforms, and direct substitution guidance for vehicle subsystem protection design.
Technical Context
This TVS diode operates in avalanche breakdown mode to clamp transient overvoltages above its 85V VRWM threshold while maintaining low leakage (<0.5µA) during normal operation. Its glass-passivated junction ensures stable breakdown characteristics across -55°C to +175°C junction temperature range.
The device responds to 10×1000µs waveform surges with 137V clamping voltage at 2.9A IPP, delivering 400W peak pulse power dissipation. It is rated for 40A non-repetitive forward surge current (8.3ms half-sine) and complies with IATF 16949 manufacturing controls.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - Sustains single-event transients per ISO7637-2 without failure |
| Reverse Standoff Voltage | 85V - Blocks normal 12V/24V automotive system voltages with margin |
| Max Clamping Voltage | 137V @ 2.9A - Limits downstream IC stress during 10×1000µs surge |
| Breakdown Voltage | 94.4–104V @ 1mA - Ensures reliable turn-on before system damage threshold |
| Leakage Current | <0.5µA @ 85V - Minimizes quiescent power loss in always-on circuits |
| Operating Temperature | -55°C to +175°C - Supports engine bay placement without derating |
| AEC-Q101 Qualified | Yes - Validated for automotive electronic control units per stress test standard |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0 housing, 0.064g weight, cathode band polarity indicator. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current return path | Connected to ground or low-impedance reference plane for clamping |
| Cathode | Transient voltage sensing node | Connected to protected line (e.g., LIN bus, sensor VCC) to initiate clamping |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated die construction | Stable breakdown voltage and leakage across temperature and lifetime |
| Lead-free, halogen-free "Green" finish | Complies with RoHS 3 and automotive environmental compliance requirements |
| 40A IFSM surge rating | Withstands repeated load dump events without degradation |
| Uni-directional configuration | Optimized for DC-biased lines like power rails and LIN bus where polarity is fixed |
| PPAP-capable manufacturing | Supports automotive production traceability and change control documentation |
Applications
| Body Control Module (BCM) | LIN Bus Interface Protection |
|---|---|
Use Scenario: Protects BCM microcontroller I/O and power inputs from battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS clamps positive transients on 12V supply rail and signal lines. Use Value: Prevents latch-up or permanent damage to 3.3V/5V logic during ISO7637-2 Pulse 2a (+50V) and Pulse 5a (load dump). |
Use Scenario: Shields LIN transceiver pins from ESD events during assembly and service operations. IC Role / Device Role / Timing Role: Fast-response TVS limits voltage excursion to <137V during ISO10605 contact discharge (±30kV). Use Value: Maintains LIN communication integrity by preventing transceiver input stage breakdown during field ESD exposure. |
| Engine Control Unit (ECU) Sensor Inputs | Automotive Lighting Power Supply |
Use Scenario: Guards analog sensor inputs (e.g., MAP, TPS) against coupled transients from ignition coils and solenoids. IC Role / Device Role / Timing Role: Low-leakage TVS placed at connector entry point to shunt noise before signal conditioning circuitry. Use Value: Enables sub-1µA leakage to preserve accuracy of ratiometric sensor measurements in 5V reference systems. |
Use Scenario: Protects LED driver ICs in headlamp modules from reverse-polarity connection and jump-start surges. IC Role / Device Role / Timing Role: Bidirectional capability not required; unidirectional clamping suffices for DC-fed lighting rails. Use Value: Withstands 40A surge current (8.3ms) during accidental reverse battery connection without parametric shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ85A-13-F | No AEC-Q101 qualification; standard industrial grade | Not approved for automotive production; suitable for prototyping or non-safety-critical systems | Select when AEC-Q101 compliance is not required and cost sensitivity outweighs qualification needs |
| SMCJ85A-Q | Higher 1500W peak power; DO-214AB package; same 85V VRWM | Used where higher surge immunity is needed (e.g., alternator output lines) | Choose for applications requiring >400W pulse handling or larger thermal mass |
Compared with SMAJ85AQ-13-F, SMAJ85A-13-F lacks automotive qualification and PPAP support, while SMCJ85A-Q offers greater surge capacity but requires larger board space and different layout-making SMAJ85AQ-13-F optimal for space-constrained, production-grade automotive modules.
Availability
SMAJ85AQ-13-F is available at Aetrix Electronics and suitable for body control modules, LIN bus interfaces, and engine control unit sensor protection requiring stable component supply across automotive production lifecycles.
Supply support for SMAJ85AQ-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, specializing in high-reliability components for automotive, industrial, and computing markets.
This part belongs to the SMAJ-AQ automotive TVS diode family, engineered specifically for ISO7637-2 and ISO10605 compliance in vehicle electronic control units and sensor systems.
FAQ
What is the maximum clamping voltage of SMAJ85AQ-13-F and under what test condition?
The maximum clamping voltage is 137V, measured at 2.9A peak pulse current using the standardized 10×1000µs double-exponential waveform per Figure 4 in DS40739 Rev. 17-2. This value guarantees protection of downstream 150V-rated components during transient events.
Does SMAJ85AQ-13-F meet AEC-Q101 requirements for automotive use?
Yes - it is fully AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable. Test reports cover HTOL, TCT, ESD, and surge validation per the AEC-Q101-004 standard for discrete semiconductors.
How does the unidirectional configuration affect circuit implementation?
Unidirectional operation requires correct anode-to-ground orientation. It provides lower leakage and tighter clamping than bidirectional versions at the same VRWM, making it ideal for DC-biased lines such as 12V power rails and LIN bus signals where polarity is fixed.
What is the thermal derating behavior above +25°C ambient?
Peak pulse power remains flat up to +25°C, then linearly derates to ~70% at +100°C ambient per Figure 1. Steady-state power dissipation drops from 1.0W at +75°C lead temperature to zero at +175°C, requiring appropriate PCB copper area for thermal management in high-TA environments.
SMAJ85AQ-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 2.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMA
SMAJ85AQ-13-F FAQ
1.How can I place an order for SMAJ85AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ85AQ-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 SMAJ85AQ-13-F reliable?
The price and inventory of SMAJ85AQ-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 SMAJ85AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ85AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ85AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ85AQ-13-F?
SMAJ85AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ85AQ-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 SMAJ85AQ-13-F?
For technical support, including SMAJ85AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ85AQ-13-F requirements.
6.How does Aetrix verify that SMAJ85AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ85AQ-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 SMAJ85AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ85AQ-13-F?
All SMAJ85AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ85AQ-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 SMAJ85AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ85AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ85AQ-13-F Tags
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