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Diodes Incorporated SMAJ51CAQ-13-F
- Part No.:
- SMAJ51CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ51CAQ-13-F.pdf
- Description:
- TVS DIODE 51VWM 82.4VC SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,699
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Product details
Overview
SMAJ51CAQ-13-F from Diodes Incorporated is a bi-directional automotive transient voltage suppressor (TVS) diode in SMA package, rated for 400W peak pulse power, 51V reverse standoff voltage (VRWM), and 82.4V max clamping voltage (VC) at 4.9A peak pulse current (IPP). It protects CAN, LIN, and sensor interfaces in 12V/24V vehicle subsystems against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ51CAQ-13-F datasheet, SMAJ51CAQ-13-F pinout, SMAJ51CAQ-13-F application, or SMAJ51CAQ-13-F equivalent, this device is selected for AEC-Q101-compliant surge protection where clamping voltage margin, low leakage (<0.5µA @ VRWM), and IATF 16949-manufactured traceability are critical in body control modules, infotainment power rails, and ADAS camera interfaces.
Technical Context
This bi-directional TVS operates symmetrically across both polarities with identical clamping behavior in positive and negative surges, enabling single-device protection of AC-coupled or differential automotive signals like CAN H/L. Its glass-passivated die ensures stable breakdown characteristics over -55°C to +175°C junction temperature range.
Designed for non-repetitive 10×1000µs waveform compliance, it delivers 82.4V clamping at 4.9A IPP while maintaining <0.5µA reverse leakage at 51V VRWM - meeting stringent leakage requirements for always-on automotive domains such as telematics and gateway ECUs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains ISO7637-2 Pulse 3b (+100V) without failure under defined test conditions |
| Reverse Standoff Voltage | 51V - sets minimum operating voltage threshold before clamping activation in 12V/24V systems |
| Max Clamping Voltage | 82.4V @ IPP = 4.9A - limits downstream IC stress during 10×1000µs surge events |
| Breakdown Voltage | 56.7–62.7V @ IT = 1.0mA - guarantees reliable turn-on within ±11% tolerance band |
| Reverse Leakage | <0.5µA @ VRWM = 51V - prevents battery drain in always-powered vehicle modules |
| Operating Temperature | -55°C to +175°C - supports under-hood placement in engine control units and transmission controllers |
Pinout & Package
Package: SMA (Surface-Mount Axial), molded plastic UL 94V-0, 0.064g weight, cathode band omitted (bi-directional configuration).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge current entry (negative polarity) | Accepts reverse surge energy during ISO7637-2 Pulse 1 (-100V) or Pulse 3a (-150V) |
| Cathode | Surge current entry (positive polarity) | Accepts forward surge energy during ISO7637-2 Pulse 2a (+50V) or Pulse 3b (+100V) |
Key Features
| Feature | Design Value |
|---|---|
| Bi-directional clamping symmetry | Identical VC = 82.4V for ±4.9A pulses - eliminates need for dual unidirectional devices on differential lines |
| AEC-Q101 qualification | Validated for automotive use with PPAP capability and IATF 16949 manufacturing - enables direct BOM integration into Tier-1 designs |
| Glass passivated junction | Stable VBR drift <±5% over 1000hr HTOL testing - ensures long-term reliability in high-temp engine compartments |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU), Br+Cl <1500ppm, Sb <1000ppm - meets global automotive environmental mandates |
Applications
| Body Control Module (BCM) | Infotainment Power Rail |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module actuators from load dump and jump-start transients. IC Role / Device Role / Timing Role: Bi-directional TVS placed between LIN PHY and connector, clamping both positive and negative surges. Use Value: 82.4V clamping ensures transceiver survival during ISO7637-2 Pulse 2a (+50V) and Pulse 1 (-100V) without signal distortion. |
Use Scenario: Safeguarding USB-C and HDMI power inputs in head unit against battery disconnection spikes. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 5V/12V input rail upstream of DC-DC converters. Use Value: 400W peak power rating absorbs 10×1000µs surges without thermal runaway, preserving system uptime. |
| ADAS Camera Interface | Telematics Control Unit (TCU) |
Use Scenario: Shielding FPD-Link III serial interface from ESD and coupled noise in rear-view cameras. IC Role / Device Role / Timing Role: Low-capacitance bi-directional TVS on differential data lines (CLK+/CLK-, DATA+/DATA-). Use Value: Sub-1µA leakage at 51V VRWM avoids bias current interference on high-impedance video signal paths. |
Use Scenario: Securing cellular modem power supply against ignition-induced transients in connected car gateways. IC Role / Device Role / Timing Role: Secondary protection stage after primary fuse and LC filter on 3.3V/5V modem rails. Use Value: -55°C to +175°C operating range supports continuous operation in sealed TCU enclosures near exhaust routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SAC51C-TB | Same VRWM (51V), lower PPK (300W), higher VC (87V @ 4.6A) | Limited to lower-energy ISO10605-only use; not rated for full ISO7637-2 Pulse 3a/b | Select when cost sensitivity outweighs full automotive surge compliance |
| SMCJ51CA | Higher PPK (1500W), same VRWM/VC, larger SMC package (7.1mm × 6.2mm) | Requires PCB area increase; suitable for under-hood high-energy zones like alternator output | Select when system-level surge exposure exceeds 400W but space allows SMC footprint |
Compared with SAC51C-TB and SMCJ51CA, SMAJ51CAQ-13-F uniquely balances AEC-Q101 qualification, 400W ISO7637-2 compliance, and SMA footprint - making it optimal for space-constrained, safety-critical modules where full standard coverage and manufacturability are mandatory.
Availability
SMAJ51CAQ-13-F is available at Aetrix Electronics and suitable for automotive body electronics, infotainment systems, and ADAS camera modules requiring stable component supply with full AEC-Q101 traceability and IATF 16949 sourcing.
Supply support for SMAJ51CAQ-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.
SMAJ series TVS diodes are engineered specifically for AEC-Q101-compliant automotive surge protection, targeting ISO7637-2 and ISO10605 compliance in compact surface-mount formats for ECU and sensor interface applications.
FAQ
Is SMAJ51CAQ-13-F unidirectional or bidirectional?
SMAJ51CAQ-13-F is a bi-directional TVS diode, indicated by the "C" suffix in the part number. It provides symmetrical clamping for both positive and negative transients without polarity dependence, making it ideal for protecting differential buses like CAN and LIN where voltage swings occur in both directions.
What is the maximum clamping voltage at rated peak pulse current?
The maximum clamping voltage (VC) is 82.4V at a peak pulse current (IPP) of 4.9A, measured using the standardized 10×1000µs waveform per Figure 4 in DS40739. This value defines the upper voltage limit imposed on protected circuitry during surge events.
Does SMAJ51CAQ-13-F meet AEC-Q101 requirements?
Yes - SMAJ51CAQ-13-F is explicitly qualified to AEC-Q101, manufactured in IATF 16949-certified facilities, and PPAP-capable. Test reports cover HTOL, temperature cycling, ESD, and surge robustness per automotive stress profiles, documented in Diodes' product definitions portal.
How does the SMA package compare to SMB or SMC for this device?
The SMA package (4.6mm × 2.9mm) offers 40% smaller footprint than SMB and 70% smaller than SMC while maintaining 400W rating. Its thermal resistance (RθJA ≈ 120°C/W) suits moderate-power applications; SMC is preferred only when >400W derating or higher IFSM (100A) is required.
SMAJ51CAQ-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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 4.9A
- 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
SMAJ51CAQ-13-F FAQ
1.How can I place an order for SMAJ51CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ51CAQ-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 SMAJ51CAQ-13-F reliable?
The price and inventory of SMAJ51CAQ-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 SMAJ51CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ51CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ51CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ51CAQ-13-F?
SMAJ51CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ51CAQ-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 SMAJ51CAQ-13-F?
For technical support, including SMAJ51CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ51CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ51CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ51CAQ-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 SMAJ51CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ51CAQ-13-F?
All SMAJ51CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ51CAQ-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 SMAJ51CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ51CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ51CAQ-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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