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Taiwan Semiconductor Corporation SMBJ48CAH
- Part No.:
- SMBJ48CAH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CAH.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,281
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Product details
Overview
SMBJ48CAH from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for automotive-grade ESD and surge protection in DC power rails and signal lines. It features a 48 V working stand-off voltage (VWM), 53.3–58.9 V breakdown voltage (VBR), 7.3 A peak pulse current (IPP), 77.4 V maximum clamping voltage (VC) at IPP, and 600 W peak pulse power (PPK) with 10/1000 µs waveform - deployed in lighting control modules, infotainment power inputs, and CAN bus interface protection.
For engineers reviewing the SMBJ48CAH datasheet, SMBJ48CAH pinout, SMBJ48CAH application, or SMBJ48CAH equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package thermal performance (RθJA = 55 °C/W), and leakage current ≤1 µA at 48 V.
Technical Context
The SMBJ48CAH implements a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and low capacitance, enabling effective suppression of EFT (IEC 61000-4-4) and surge events (IEC 61000-4-5) without signal distortion. Its bidirectional configuration eliminates polarity dependency, supporting symmetric voltage transients across both polarities.
Thermally, it sustains junction temperatures from –55 °C to +150 °C with RθJC = 10 °C/W and RθJA = 55 °C/W, allowing reliable operation under high ambient conditions typical in under-hood automotive electronics. The device meets JESD201 Class 2 whisker resistance and moisture sensitivity level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous DC or RMS voltage the device blocks without clamping; defines operating rail compatibility. |
| VBR min/max | 53.3 V / 58.9 V - Breakdown occurs within this range at 1 mA test current; ensures predictable turn-on margin above VWM. |
| VC @ IPP | 77.4 V - Clamped voltage during 7.3 A 10/1000 µs surge; determines protected circuit's maximum overvoltage exposure. |
| PPK | 600 W - Peak pulse power handling per 10/1000 µs waveform; validates robustness against ISO 7637-2 Pulse 5a surges. |
| ID @ VWM | ≤1 µA - Reverse leakage at rated stand-off voltage; ensures minimal power loss and no false triggering in low-power systems. |
| TJ max | +150 °C - Maximum junction temperature; supports placement near heat sources in engine control units and ADAS modules. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline with 0.090 g mass, UL 94V-0 molding, and matte tin-plated leads. |
Pinout & Package
DO-214AA (SMB) package: surface-mount, two-terminal, bidirectional device with cathode band omitted (no polarity marking required). Terminals are symmetrical; either end functions as anode or cathode depending on transient polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient conduction path | Both terminals conduct equally during positive or negative transients; no PCB layout polarity constraint. |
| Cathode band (absent) | N/A - Not applicable | Bidirectional construction eliminates need for polarity marking; simplifies automated placement and reduces BOM variants. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain, chassis, and body electronics per stress test requirements. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise) waveforms. |
| Fast response time | <1.0 ps - Limits voltage overshoot before clamping engages, critical for protecting sub-20 ns logic interfaces. |
| Low leakage current | <1 µA at 48 V - Enables use in always-on circuits (e.g., CAN standby nodes) without battery drain concerns. |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; suitable for green manufacturing and export. |
Applications
| Automotive Lighting Control | CAN Bus Interface Protection |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients during headlamp switching in 12 V vehicle systems. IC Role / Device Role / Timing Role: Bidirectional TVS placed between power rail and ground, clamping ±100 V spikes within nanoseconds. Use Value: Prevents latch-up or permanent damage to 48 V-rated controllers while maintaining <1 µA quiescent leakage. |
Use Scenario: Safeguarding CAN transceivers (e.g., TJA1042) against ESD and coupled surges on differential bus lines. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp across CAN_H–CAN_L or each line-to-ground. Use Value: Maintains signal integrity up to 1 Mbps by limiting clamping voltage to 77.4 V without distorting edge timing. |
| Infotainment Power Input | Industrial Sensor Signal Conditioning |
Use Scenario: Shielding USB-C PD controllers and audio codecs from battery reverse-connection and jump-start surges. IC Role / Device Role / Timing Role: Primary rail protector upstream of LDOs and PMICs in head unit power tree. Use Value: Delivers 600 W surge handling with RθJA = 55 °C/W, enabling compact layout without forced airflow. |
Use Scenario: Protecting analog front-ends (e.g., ADS1256) in factory-floor pressure/temperature sensors exposed to relay coil kickback. IC Role / Device Role / Timing Role: Ground-referenced clamp on 4–20 mA loop supply or sensor excitation rail. Use Value: Ensures <1 µA leakage at 48 V stand-off, preserving measurement accuracy in µV-level signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ48CA | Same DO-214AC (SMA) package; 77 V VC @ 7.3 A; higher RθJA (65 °C/W); non-AEC-Q101. | Limited to industrial/commercial environments; not qualified for automotive under-hood use. | Select when cost sensitivity outweighs automotive qualification and thermal derating margin is available. |
| ON Semiconductor SMCJ48CA | DO-214AB (SMC) package; 79.4 V VC @ 7.3 A; AEC-Q101 qualified; higher PPK (1500 W). | Requires larger PCB footprint; suited for higher-energy surge zones (e.g., alternator output). | Choose for enhanced surge margin where board space permits and 1500 W rating is required per ISO 7637-2 Pulse 5a. |
Compared with SMAJ48CA and SMCJ48CA, the SMBJ48CAH offers optimal balance of AEC-Q101 compliance, DO-214AA (SMB) footprint efficiency, and 600 W surge capability - making it the preferred choice for space-constrained automotive modules requiring validated reliability and thermal performance.
Availability
SMBJ48CAH is available at Aetrix Electronics and suitable for automotive lighting control, CAN bus interface protection, and infotainment power input applications requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBJ48CAH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers with global distribution and AEC-Q101 validation capabilities.
The SMBJH series was engineered specifically for automotive-grade transient suppression - emphasizing fast response, low leakage, and robust thermal performance in compact DO-214AA packages for ECU, lighting, and communication subsystems.
FAQ
What is the clamping voltage of SMBJ48CAH at its rated peak pulse current?
The SMBJ48CAH has a maximum clamping voltage (VC) of 77.4 V when subjected to its rated peak pulse current (IPP) of 7.3 A with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees the protected circuit will not experience more than 77.4 V during standardized surge events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is SMBJ48CAH suitable for bidirectional signal line protection such as RS-485 or CAN?
Yes, SMBJ48CAH is explicitly designed for bidirectional operation, as indicated by the "CAH" suffix and confirmed in the datasheet's "Devices for Bipolar Applications" section. Its symmetrical VBR (53.3–58.9 V) and VC characteristics in both polarities make it appropriate for differential bus protection like CAN or RS-485, provided layout minimizes parasitic inductance to preserve sub-nanosecond response.
Does SMBJ48CAH meet automotive qualification standards?
Yes, SMBJ48CAH is AEC-Q101 qualified and meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b test requirements. It also complies with JESD201 Class 2 whisker resistance and moisture sensitivity level 1 (MSL-1), confirming suitability for reflow-soldered automotive electronics assemblies without floor-life restrictions.
What is the thermal resistance from junction to ambient for SMBJ48CAH?
The SMBJ48CAH has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W under standard JEDEC conditions. This value assumes a 1-inch² copper pad on FR-4 PCB with 2 oz copper; actual thermal performance improves with enhanced copper area or thermal vias - essential for sustained surge duty cycles in engine control units.
How does SMBJ48CAH differ from unidirectional SMBJ48H?
SMBJ48CAH is bidirectional with symmetrical clamping in both polarities and no cathode marking, whereas SMBJ48H is unidirectional with a cathode band and forward voltage drop (~3.5 V at 50 A). SMBJ48CAH supports AC-coupled or polarity-agnostic protection; SMBJ48H is limited to DC rails where polarity is fixed and forward conduction may be acceptable.
SMBJ48CAH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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):
- 8.1A
- Power - Peak Pulse:
- 600W
- 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:
- DO-214AA (SMB)
SMBJ48CAH FAQ
1.How can I place an order for SMBJ48CAH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CAH 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 SMBJ48CAH reliable?
The price and inventory of SMBJ48CAH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CAH is usually 5 days.
3.What payment methods are accepted for SMBJ48CAH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CAH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CAH?
SMBJ48CAH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CAH 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 SMBJ48CAH?
For technical support, including SMBJ48CAH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CAH requirements.
6.How does Aetrix verify that SMBJ48CAH is sourced from the original manufacturer or authorized distributors?
All SMBJ48CAH 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 SMBJ48CAH meets industry standards.
7.What is the process for return or replacement of SMBJ48CAH?
All SMBJ48CAH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CAH, 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 SMBJ48CAH part is unused and in its original packaging.
Return procedure for SMBJ48CAH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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