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Diodes Incorporated SMAJ70AQ-13-F
- Part No.:
- SMAJ70AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ70AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMA
- Quantity:
- Payment:
- Shipping:
Inventory:2,402
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Product details
Overview
SMAJ70AQ-13-F from Diodes Incorporated is a unidirectional 400W surface-mount transient voltage suppressor (TVS) diode designed for automotive circuit protection. It features a 70V reverse standoff voltage (VRWM), 113V maximum clamping voltage (VC) at 3.5A peak pulse current (IPP), and AEC-Q101 qualification for under-hood applications such as engine control units and body electronics.
For engineers reviewing the SMAJ70AQ-13-F datasheet, SMAJ70AQ-13-F pinout, SMAJ70AQ-13-F application, or SMAJ70AQ-13-F equivalent, key selection criteria include ISO7637-2 Pulse 1/2a/3a/3b surge immunity, ISO10605 ESD robustness (±30kV), clamping ratio (VC/VRWM ≈ 1.61), and SMA package thermal performance in high-reliability automotive environments.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-anode polarity, activated only during negative transients relative to its anode reference. Its glass-passivated junction ensures stable breakdown behavior across -55°C to +175°C operating temperature range and supports single-pulse surge handling per 10×1000μs waveform.
The device complies with automotive-specific surge standards: ISO7637-2 Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V), while meeting ISO10605 ESD requirements (30kV air/contact discharge) - all validated under AEC-Q101 stress testing protocols in IATF 16949-certified facilities.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000μs surges without failure in automotive load-dump scenarios |
| Reverse Standoff Voltage | 70V - defines maximum continuous DC operating voltage before clamping initiates |
| Clamping Voltage | 113V @ IPP = 3.5A - limits downstream IC voltage stress during ISO7637-2 Pulse 1 (-100V) |
| Breakdown Voltage | 77.8–86.0V @ IT = 1.0mA - ensures reliable turn-on margin above VRWM for noise immunity |
| Leakage Current | <0.5μA @ VRWM - negligible standby power loss in always-on vehicle modules |
| Operating Temperature | -55°C to +175°C - enables placement near engines, transmissions, and power inverters |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0, 0.064g mass, moisture sensitivity level 1 per J-STD-020. Cathode band denotes polarity on unidirectional variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for clamping action | Connected to protected line (e.g., CAN_H, LIN, sensor supply); clamps negative transients to ground |
| Cathode | Surge return path | Connected to system ground or low-impedance return plane; carries full surge current during clamping |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with temperature cycling, HTRB, and surge endurance per stress test plan |
| Glass-passivated die | Enhances long-term reliability and reduces parameter drift under thermal cycling and humidity exposure |
| Lead-free & halogen-free | Meets RoHS 3 (2015/863/EU) and "Green" definition: Br+Cl <1500ppm, Sb <1000ppm |
| ISO7637-2 compliance | Rated for Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), Pulse 3b (+100V) waveforms |
Applications
| Engine Control Unit (ECU) Power Input | CAN Bus Line Protection |
|---|---|
Use Scenario: Protects 12V battery-supplied microcontroller power rails from load dump and alternator ripple. IC Role / Device Role: Unidirectional TVS placed between VBAT and GND to clamp negative transients below -100V per ISO7637-2 Pulse 1. Use Value: Limits voltage excursion to ≤113V, preventing damage to LDOs and MCU internal regulators rated for 40V absolute max. | Use Scenario: Shields high-speed CAN transceivers from ESD events and coupled noise on differential bus lines. IC Role / Device Role: Paired unidirectional TVS devices (one per line) referenced to common-mode ground. Use Value: Clamps ±30kV ESD strikes (ISO10605) within 1ns, preserving signal integrity and avoiding bus lockup. |
| Body Control Module (BCM) Sensor Interface | ADAS Camera Power Supply |
Use Scenario: Guards analog sensor inputs (e.g., temperature, pressure) against wiring harness-induced transients. IC Role / Device Role: Low-leakage (≤0.5μA) TVS placed at connector entry point before signal conditioning amplifier. Use Value: Prevents input-stage saturation during Pulse 3a (-150V), maintaining ADC accuracy without adding offset error. | Use Scenario: Secures 5V/3.3V camera module power rail exposed to vibration-induced arcing in rear-view systems. IC Role / Device Role: Fast-response clamping device mounted adjacent to DC-DC converter output capacitor. Use Value: Absorbs 400W surge energy without thermal runaway, enabling operation up to +175°C junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ70A-13-F | No AEC-Q101 qualification; standard industrial grade | Not approved for PPAP or automotive change control processes | Select when used in non-automotive industrial controls with lower reliability requirements |
| SMCJ70A-Q | Higher 1500W peak power; DO-214AB (SMC) package; same VRWM/VC | Larger footprint; better thermal dissipation but incompatible with SMA PCB layout | Choose for higher-energy surge environments where board space allows larger package |
Compared with SMAJ70A-13-F, the AQ variant adds automotive qualification and tighter process controls; compared with SMCJ70A-Q, it trades peak power for compact SMA footprint - critical for space-constrained ADAS and infotainment modules.
Availability
SMAJ70AQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN bus interfaces, and body electronics requiring stable component supply across extended automotive product lifecycles.
Supply support for SMAJ70AQ-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.
The SMAJ(AQ) series is part of Diodes' Automotive TVS portfolio, engineered specifically to meet stringent ISO7637-2 and ISO10605 requirements in safety-critical vehicle subsystems.
FAQ
What does the 'AQ' suffix signify in SMAJ70AQ-13-F?
The 'AQ' suffix indicates AEC-Q101 qualification, PPAP capability, and manufacturing in IATF 16949-certified facilities. It confirms compliance with automotive-grade reliability testing including temperature cycling, highly accelerated life testing (HALT), and surge endurance - distinguishing it from standard industrial-grade variants like SMAJ70A-13-F.
Can SMAJ70AQ-13-F be used in bidirectional signal lines like RS-485?
No - SMAJ70AQ-13-F is unidirectional and lacks symmetrical clamping for positive and negative transients. For bidirectional data lines, use the bi-directional variant SMAJ70CAQ-13-F (with 'C' suffix), which provides matched clamping in both polarities and is marked without cathode band.
How does the 113V clamping voltage relate to ISO7637-2 Pulse 1 (-100V)?
The 113V clamping voltage occurs at 3.5A peak pulse current under 10×1000μs waveform conditions. Since ISO7637-2 Pulse 1 specifies a -100V open-circuit voltage with 2Ω source impedance, the resulting current is ~50A - well above the device's 3.5A rating. Therefore, SMAJ70AQ-13-F must be used with series impedance (e.g., fuse, resistor) to limit current into the TVS during Pulse 1 events.
Is the SMA package suitable for reflow soldering in lead-free processes?
Yes - the SMAJ70AQ-13-F uses matte tin lead-free plating compliant with IPC/JEDEC J-STD-020 moisture sensitivity level 1, supporting standard Pb-free reflow profiles (peak 260°C). Its UL 94V-0 molded plastic housing withstands repeated thermal excursions without delamination or cracking.
SMAJ70AQ-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):
- 70V
- Voltage - Breakdown (Min):
- 77.8V
- Voltage - Clamping (Max) @ Ipp:
- 113V
- Current - Peak Pulse (10/1000µs):
- 3.5A
- 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
SMAJ70AQ-13-F FAQ
1.How can I place an order for SMAJ70AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ70AQ-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 SMAJ70AQ-13-F reliable?
The price and inventory of SMAJ70AQ-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 SMAJ70AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ70AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ70AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ70AQ-13-F?
SMAJ70AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ70AQ-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 SMAJ70AQ-13-F?
For technical support, including SMAJ70AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ70AQ-13-F requirements.
6.How does Aetrix verify that SMAJ70AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ70AQ-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 SMAJ70AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ70AQ-13-F?
All SMAJ70AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ70AQ-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 SMAJ70AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ70AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ70AQ-13-F Tags
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