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Diodes Incorporated SMAJ48AQ-13-F
- Part No.:
- SMAJ48AQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48AQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SMAJ48AQ-13-F from Diodes Incorporated is a unidirectional 400W automotive transient voltage suppressor (TVS) diode with 48V reverse standoff voltage, 77.4V max clamping voltage at 5.2A peak pulse current, and AEC-Q101 qualification. It protects CAN bus, LIN, and body control modules against ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), and ISO10605 ESD (±30kV contact/air discharge).
For engineers reviewing the SMAJ48AQ-13-F datasheet, SMAJ48AQ-13-F pinout, SMAJ48AQ-13-F application, or SMAJ48AQ-13-F equivalent, this device serves as a primary front-end surge clamp for 12V/24V automotive power rails where precise clamping, low leakage (<0.5µA @ 48V), and IATF 16949 traceability are required.
Technical Context
This unidirectional TVS uses glass-passivated silicon junction construction to achieve fast response (<1.0ps) to transients and stable clamping under repeated 10/1000µs waveform surges. Its thermal design supports operation from −55°C to +175°C junction temperature with 1.0W steady-state dissipation at TL = +75°C.
The device complies with ISO7637-2 Pulse 1 (−100V), Pulse 2a (+50V), Pulse 3a (−150V), and Pulse 3b (+100V), and meets ISO10605 ESD requirements with 150pF/330Ω network - validated for use on battery-fed ECUs, sensor interfaces, and infotainment power inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000µs surge without failure; derates linearly above +25°C ambient. |
| Reverse Standoff Voltage (VRWM) | 48V - maximum continuous DC or RMS voltage before significant leakage; matches 24V system nominal + margin. |
| Max Clamping Voltage (VC) | 77.4V @ IPP = 5.2A - limits downstream IC stress during ISO7637-2 Pulse 1; ensures <80V rail excursion. |
| Breakdown Voltage (VBR) | 53.3–58.9V @ IT = 1.0mA - tight 10.5% tolerance enables predictable turn-on across production lots. |
| Reverse Leakage (IR) | <0.5µA @ VRWM = 48V - negligible standby current; avoids battery drain in always-on vehicle modules. |
| Operating Temperature | −55°C to +175°C TJ - qualified for engine bay, transmission control, and under-hood ECU placement. |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, molded plastic UL 94V-0 housing, cathode band polarity indicator, 0.064g weight. Moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; defines clamping threshold relative to GND. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., battery rail); conducts surge current to ground when voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use with PPAP capability and IATF 16949 manufacturing control. |
| Glass-passivated die | Ensures long-term reliability under thermal cycling and humidity exposure in under-hood environments. |
| Lead-free & halogen-free | RoHS 3 compliant (2015/863/EU); <900ppm Br, <900ppm Cl, <1000ppm Sb - meets global "Green" requirements. |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes overvoltage stress on downstream 75V-rated regulators and CAN transceivers. |
Applications
| Body Control Module (BCM) | Engine Control Unit (ECU) Power Input |
|---|---|
|
Use Scenario: Protects BCM 12V supply rail from load dump and alternator ripple during ignition cycles. IC Role / Device Role / Timing Role: Primary unidirectional TVS clamp placed upstream of DC-DC converter input. Use Value: Limits voltage excursions to ≤77.4V during ISO7637-2 Pulse 1 (−100V), preventing regulator latch-up and MCU brownout. |
Use Scenario: Shields ECU microcontroller and sensor interface circuitry from battery line transients during cranking and jump-start events. IC Role / Device Role / Timing Role: Front-end surge suppression on main 12V/24V input before LDO and CAN PHY stages. Use Value: Withstands 40A peak surge (IFSM = 40A, 8.3ms half-sine) while maintaining <0.5µA leakage at 48V standby. |
| CAN FD Transceiver Interface | Automotive Lighting Driver |
|
Use Scenario: Guards high-speed CAN FD physical layer against ESD and coupled noise from adjacent power lines. IC Role / Device Role / Timing Role: Low-capacitance TVS on CAN_H/CAN_L differential pair (used with bi-directional variant; unidirectional used on VCC rail). Use Value: Clamps common-mode surges to <77.4V within 1ps, preserving signal integrity and meeting ISO11898-2 EMC immunity targets. |
Use Scenario: Protects LED driver ICs and MOSFET gate drivers in adaptive headlamp modules exposed to PWM switching noise and relay bounce. IC Role / Device Role / Timing Role: Rail clamp on 24V supply feeding buck controller and current-sense amplifier. Use Value: 400W peak rating absorbs repetitive 30kV ESD events (ISO10605) without parameter shift or degradation over 10,000 cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional automotive TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ48A-13-F | No AEC-Q101 qualification; non-automotive grade; same electrical specs and package. | Not PPAP-capable; unsuitable for Tier 1 automotive BOMs requiring change control and IATF 16949 traceability. | Select only for industrial or consumer prototypes where automotive qualification is not mandated. |
| 1.5SMC47A | Same 47V VRWM, but 1500W rating, DO-214AB package, higher VF (1.2V), and no AEC-Q101 certification. | Larger footprint (7.1mm × 6.2mm vs. SMA's 4.6mm × 2.9mm); incompatible with space-constrained automotive PCBs. | Use only if higher surge capacity is needed and board area permits larger package; not drop-in compatible. |
Compared with SMAJ48A-13-F and 1.5SMC47A, SMAJ48AQ-13-F uniquely delivers AEC-Q101 compliance, IATF 16949 manufacturing, and compact SMA packaging - making it the sole choice for production automotive ECUs requiring full PPAP documentation and zero-defect traceability.
Availability
SMAJ48AQ-13-F is available at Aetrix Electronics and suitable for automotive body electronics, powertrain control units, and ADAS domain controllers requiring stable component supply with full AEC-Q101 documentation and lot-level traceability.
Supply support for SMAJ48AQ-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 manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and computing markets, with design centers across Asia, Europe, and the US.
The SMAJ(AQ) series is engineered specifically for automotive-grade transient suppression - delivering AEC-Q101 reliability, ISO7637-2/ISO10605 compliance, and optimized clamping performance in space-constrained SMA packages.
FAQ
What is the difference between SMAJ48AQ-13-F and SMAJ48A-13-F?
SMAJ48AQ-13-F is AEC-Q101 qualified, manufactured in IATF 16949 certified facilities, and PPAP capable - required for automotive production. SMAJ48A-13-F lacks automotive qualification, traceability, and change control; it shares identical electrical specs and package but is rated for industrial use only.
Does SMAJ48AQ-13-F support bidirectional surge protection?
No - SMAJ48AQ-13-F is unidirectional. For bidirectional protection, use SMAJ48CAQ-13-F (with 'C' suffix), which provides symmetrical clamping for AC-coupled lines like CAN or LIN data buses, with identical VRWM and clamping performance in both polarities.
What is the maximum allowable ambient temperature for continuous operation?
At TA = +25°C, the device supports full 400W peak pulse power. Steady-state power dissipation derates to 1.0W at TL = +75°C. Continuous operation is supported from −55°C to +175°C junction temperature; ambient limit depends on PCB copper area and airflow - typical max TA is +125°C with 1-inch² 2oz copper pad.
Is SMAJ48AQ-13-F compatible with lead-free reflow soldering profiles?
Yes - it features matte tin lead-free plating, qualified per JEDEC J-STD-020 moisture sensitivity Level 1, and supports standard Pb-free reflow profiles (peak 260°C, 60s max). The SMA package withstands thermal cycling without delamination or parameter shift when soldered per IPC-J-STD-001 Class 3 guidelines.
SMAJ48AQ-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):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 5.2A
- 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
SMAJ48AQ-13-F FAQ
1.How can I place an order for SMAJ48AQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48AQ-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 SMAJ48AQ-13-F reliable?
The price and inventory of SMAJ48AQ-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 SMAJ48AQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ48AQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48AQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48AQ-13-F?
SMAJ48AQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48AQ-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 SMAJ48AQ-13-F?
For technical support, including SMAJ48AQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48AQ-13-F requirements.
6.How does Aetrix verify that SMAJ48AQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ48AQ-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 SMAJ48AQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ48AQ-13-F?
All SMAJ48AQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48AQ-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 SMAJ48AQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ48AQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48AQ-13-F Tags
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Diodes Incorporated
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