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Diodes Incorporated SMAJ48CAQ-13-F
- Part No.:
- SMAJ48CAQ-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ48CAQ-13-F.pdf
- Description:
- TRANSIENT VOLTAGE SUPPRESSOR SMA
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
SMAJ48CAQ-13-F from Diodes Incorporated is a bi-directional automotive-grade transient voltage suppressor (TVS) diode in SMA package, rated for 400W peak pulse power, 48V reverse standoff voltage (VRWM), and 77.4V maximum clamping voltage (VC) at 5.2A peak pulse current. It protects CAN, LIN, and sensor interfaces in engine control units and body electronics against ISO7637-2 Pulse 1/2a/3a/3b transients and ISO10605 ESD events.
For engineers reviewing the SMAJ48CAQ-13-F datasheet, SMAJ48CAQ-13-F pinout, SMAJ48CAQ-13-F application, or SMAJ48CAQ-13-F equivalent, this device is selected for AEC-Q101-compliant 12V/24V automotive subsystems requiring precise clamping, low leakage (<0.5µA @ VRWM), and IATF 16949-manufactured reliability under -55°C to +175°C operating conditions.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, with breakdown voltage VBR of 53.3–58.9V at 1.0mA test current and clamping performance validated per 10×1000µs waveform. Its glass-passivated die ensures stable surge response without degradation under repeated 40A IFSM surges.
Designed for automotive power rail and signal line protection, it meets ISO7637-2 Pulse 1 (-100V), Pulse 2a (+50V), Pulse 3a (-150V), and Pulse 3b (+100V) requirements while maintaining <0.5µA reverse leakage at 48V - critical for low-power always-on modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 400W - sustains single 10×1000µs transients without failure in automotive load dump scenarios |
| Reverse Standoff Voltage (VRWM) | 48V - sets minimum operating voltage threshold before clamping activation on 24V systems |
| Max Clamping Voltage (VC) | 77.4V @ IPP = 5.2A - limits downstream IC stress during ISO7637-2 Pulse 3a (-150V) |
| Breakdown Voltage (VBR) | 53.3–58.9V @ IT = 1.0mA - defines sharp, repeatable turn-on characteristic for predictable protection |
| Reverse Leakage (IR) | <0.5µA @ 48V - prevents battery drain in always-on vehicle networks like CAN FD wake-up lines |
| Operating Temperature | -55°C to +175°C - supports under-hood placement in ECU, transmission control, and ADAS sensor modules |
| AEC-Q101 Qualified | Yes - certified for automotive use with PPAP capability and IATF 16949 manufacturing traceability |
Pinout & Package
Package: SMA (Surface Mount Assembly), molded plastic UL 94V-0, 0.064g weight, moisture sensitivity level 1 per J-STD-020. Cathode band omitted - bi-directional symmetry confirmed by part suffix "C" and absence of polarity marking per datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bi-directional surge conduction path | Both terminals function identically - no polarity dependency enables flexible PCB layout on differential buses |
| Case / Body | Thermal and mechanical interface | Exposed copper pad required per Diodes' suggested SMA pad layout (X1 = 6.50mm, Y = 1.70mm) for 1.0W steady-state dissipation at TL = +75°C |
Key Features
| Feature | Design Value |
|---|---|
| 400W Peak Pulse Power | Enables robust protection against severe ISO7637-2 Pulse 1 (-100V) and Pulse 3a (-150V) without derating in compact SMA footprint |
| Glass Passivated Die | Ensures long-term parameter stability and resistance to humidity-induced leakage drift in under-hood environments |
| AEC-Q101 Qualification | Validates reliability for automotive safety-critical functions including powertrain and chassis control modules |
| Bi-directional Symmetry | Eliminates orientation constraints during automated assembly - reduces placement errors and rework on high-density PCBs |
| Halogen & Antimony Free | Meets automotive "Green" standards (<900ppm Br, <900ppm Cl, <1000ppm Sb) for end-of-life recyclability compliance |
Applications
| Engine Control Unit (ECU) Power Input | CAN FD Transceiver Protection |
|---|---|
Use Scenario: 24V battery feed to microcontroller power supply in gasoline/diesel ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Primary overvoltage clamp limiting input rail to ≤77.4V during ISO7637-2 Pulse 1 (-100V) events. Use Value: Prevents brownout or latch-up of 5V/3.3V LDOs and MCU cores by clamping within 1.2ns response time (typical). |
Use Scenario: Bidirectional protection of CAN_H/CAN_L differential pair in ADAS domain controllers interfacing with radar/sensors. IC Role / Device Role / Timing Role: Common-mode transient suppressor absorbing ±30kV ISO10605 ESD strikes without disrupting 5Mbps CAN FD signaling integrity. Use Value: Maintains <1pF junction capacitance (per Diodes typical data), avoiding signal rise-time degradation or bit error rate increase. |
| Body Control Module (BCM) LIN Bus | Automotive Camera Sensor Interface |
Use Scenario: 12V LIN slave node (e.g., door module actuator) subjected to battery reversal and cranking transients. IC Role / Device Role / Timing Role: Bi-directional rail clamp ensuring LIN transceiver survives ISO7637-2 Pulse 2a (+50V) and Pulse 3b (+100V) without latch-up. Use Value: Delivers <0.5µA leakage at 12V VRWM, preserving sleep current budget below 100µA for battery longevity. |
Use Scenario: FPD-Link III or GMSL video interface between rear camera and infotainment head unit, routed near high-current wiring. IC Role / Device Role / Timing Role: Signal-line TVS suppressing coupled noise from adjacent 12V solenoid drivers per ISO7637-2 Pulse 3a (-150V). Use Value: Clamps transients to ≤77.4V within 1ns, preventing pixel corruption or frame loss without adding series impedance to high-speed video path. |
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 |
|---|---|---|---|
| SMAJ48CA-13-F (Diodes) | No AEC-Q101 qualification; RoHS-compliant but not PPAP-capable or IATF 16949 manufactured | Acceptable for non-automotive industrial or consumer designs where change control and audit traceability are not required | Select only if automotive qualification is not mandated and cost is primary constraint |
| SMBJ48CA-Q (ON Semiconductor) | SMB package (larger footprint, 600W PPK); identical VRWM/VC specs but higher thermal mass and 1.5W PM(AV) | Better suited for high-repetition surge environments (e.g., starter motor circuits) where SMA thermal limits may be exceeded | Choose when board space allows SMB and system requires >1.0W continuous power handling |
Compared with SMAJ48CAQ-13-F, the SMAJ48CA-13-F lacks automotive qualification documentation and supply chain controls, while SMBJ48CA-Q trades miniaturization for higher thermal capacity - making the Q-suffix part optimal for AEC-Q101–mandated, space-constrained automotive signal protection.
Availability
SMAJ48CAQ-13-F is available at Aetrix Electronics and suitable for engine control units, CAN FD transceivers, body control modules, and automotive camera sensor interfaces requiring stable component supply across automotive production lifecycles.
Supply support for SMAJ48CAQ-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 with over 50 years of semiconductor expertise.
The SMAJ(C)AQ series belongs to Diodes' AEC-Q101–qualified automotive TVS portfolio, engineered specifically for ISO7637-2 and ISO10605 compliance in 12V/24V vehicle subsystems with stringent thermal and longevity requirements.
FAQ
What does the "Q" suffix signify in SMAJ48CAQ-13-F?
The "Q" suffix denotes full AEC-Q101 qualification, PPAP capability, and manufacture in IATF 16949–certified facilities. It confirms rigorous testing for temperature cycling, HTRB, and surge endurance - distinguishing it from commercial-grade variants like SMAJ48CA-13-F which lack automotive change control and audit traceability.
Is SMAJ48CAQ-13-F unidirectional or bidirectional?
SMAJ48CAQ-13-F is bi-directional, confirmed by the "C" in its part number per Diodes' ordering nomenclature (Note 9). It has symmetrical clamping behavior on both polarities, no cathode band marking, and is intended for AC-coupled or differential signal lines such as CAN, LIN, or FPD-Link where polarity reversal may occur.
What is the maximum steady-state power dissipation for this device?
The steady-state power dissipation (PM(AV)) is 1.0W at lead temperature TL = +75°C, as specified in the Maximum Ratings table. Derating is required above +75°C per Figure 6 - e.g., 0.5W at TL = +125°C - and ambient temperature derating follows Figure 1's 100% → 50% curve above +25°C.
How does SMAJ48CAQ-13-F meet ISO7637-2 Pulse 3a requirements?
It clamps to ≤77.4V at 5.2A peak pulse current under the 10×1000µs waveform, well below the -150V transient amplitude defined in ISO7637-2 Pulse 3a. Its 400W peak power rating and fast response (<1.2ns) ensure energy absorption without failure, protecting downstream 48V-tolerant receivers in body electronics.
SMAJ48CAQ-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):
- 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
SMAJ48CAQ-13-F FAQ
1.How can I place an order for SMAJ48CAQ-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ48CAQ-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 SMAJ48CAQ-13-F reliable?
The price and inventory of SMAJ48CAQ-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 SMAJ48CAQ-13-F is usually 5 days.
3.What payment methods are accepted for SMAJ48CAQ-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ48CAQ-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ48CAQ-13-F?
SMAJ48CAQ-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ48CAQ-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 SMAJ48CAQ-13-F?
For technical support, including SMAJ48CAQ-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ48CAQ-13-F requirements.
6.How does Aetrix verify that SMAJ48CAQ-13-F is sourced from the original manufacturer or authorized distributors?
All SMAJ48CAQ-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 SMAJ48CAQ-13-F meets industry standards.
7.What is the process for return or replacement of SMAJ48CAQ-13-F?
All SMAJ48CAQ-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ48CAQ-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 SMAJ48CAQ-13-F part is unused and in its original packaging.
Return procedure for SMAJ48CAQ-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ48CAQ-13-F Tags
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