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Taiwan Semiconductor Corporation SMBJ48CA
- Part No.:
- SMBJ48CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ48CA.pdf
- Description:
- TVS DIODE 48VWM 77.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:11,411
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Product details
Overview
SMBJ48CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 48 V working stand-off voltage (VWM), 53.3–65.1 V breakdown voltage (VBR), 85.5 V maximum clamping voltage (VC) at 7.3 A peak pulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package - ideal for automotive power supply input protection.
For engineers reviewing the SMBJ48CA datasheet, SMBJ48CA pinout, SMBJ48CA application, or SMBJ48CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, sub-1 ps response time, <1 µA leakage above 10 V, and UL 94V-0 molding compound - all critical for robust automotive and industrial interface protection.
Technical Context
The SMBJ48CA operates as a silicon avalanche diode with symmetrical bidirectional clamping behavior, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and low leakage across temperature.
It delivers 600 W non-repetitive peak pulse power handling under 10/1000 µs waveform per ANSI/IEEE C62.35, with thermal resistance RθJA = 55 °C/W and RθJC = 10 °C/W - supporting reliable operation up to 150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 48 V - Maximum continuous DC or RMS voltage the device blocks without clamping; sets operating margin before transient activation. |
| VBR min / max | 53.3 V / 65.1 V @ 1 mA - Confirmed breakdown range defining turn-on threshold consistency for design margining. |
| VC @ IPP | 85.5 V @ 7.3 A - Clamped voltage during 10/1000 µs surge; determines protected circuit's maximum stress level. |
| PPK | 600 W - Peak pulse power dissipation capacity; defines survivability against standardized lightning/surge events. |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss and signal integrity in high-impedance circuits. |
| Response time | <1.0 ps - Sub-picosecond avalanche initiation enables effective suppression of ESD (IEC 61000-4-2) and fast transients. |
| Package | DO-214AA (SMB) - Industry-standard surface-mount outline with 0.090 g mass, J-STD-020 Level 1 moisture sensitivity, and matte tin leads. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; bidirectional configuration means both terminals are functionally identical - no anode/cathode distinction required in circuit layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Transient current path (bidirectional) | Carries surge current in either direction during clamping; symmetric terminal structure eliminates polarity dependency. |
| Terminal 2 | Transient current path (bidirectional) | Completes low-impedance surge shunt path to ground or rail; identical electrical role to Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC signals, differential buses (e.g., RS-485), or floating power domains without external polarity management. |
| ISO 7637-2 compliance | Validated for automotive load-dump and inductive-switching transients (Pulse 1, 2a, 2b, 3a, 3b), reducing qualification effort for vehicle ECUs. |
| Glass-passivated junction | Ensures long-term VBR stability and low IR drift over temperature and lifetime - critical for mission-critical industrial systems. |
| UL 94V-0 molding compound | Meets flammability safety requirements for enclosed power supplies and transportation equipment enclosures. |
| J-STD-020 Level 1 | Allows unlimited floor life and standard reflow without baking - simplifies SMT assembly planning and reduces manufacturing cost. |
Applications
| Automotive Power Input Protection | Industrial RS-485 Interface Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECU power rail exposed to load dump and jump-start surges. IC Role / Device Role / Timing Role: TVS diode placed between power rail and chassis ground to clamp transients before they reach DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤85.5 V during 600 W surges, preventing damage to downstream 36 V-rated regulators and logic ICs. |
Use Scenario: Two-wire RS-485 transceiver bus in factory automation PLCs subject to ESD and cable-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS connected across A/B differential pair to suppress common-mode transients without distorting signal integrity. Use Value: Sub-1 ps response preserves data eye opening; 85.5 V clamping protects ±12 V transceivers while maintaining >10 kV ESD immunity. |
| LED Driver Output Protection | Smart Meter AC Mains Interface |
Use Scenario: Constant-current LED driver output feeding outdoor signage with long cable runs susceptible to induced lightning surges. IC Role / Device Role / Timing Role: SMBJ48CA placed across LED string terminals to shunt surge energy away from driver MOSFETs and current-sense resistors. Use Value: 600 W rating handles multi-kA induced surges; 48 V VWM matches typical 42–48 V LED string operating range. |
Use Scenario: Voltage monitoring input of utility smart meter connected to 230 VAC mains via resistive divider. IC Role / Device Role / Timing Role: Bidirectional TVS on divider output node to clamp fast transients from switching noise or nearby lightning strikes. Use Value: Symmetric clamping prevents negative-voltage latch-up in ADC front-end; UL 94V-0 compound satisfies meter housing fire safety standards. |
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; 85.5 V VC @ 7.3 A, but 400 W PPK rating (vs. 600 W). | Lower surge energy handling limits use in high-risk automotive/load-dump scenarios. | Select SMBJ48CA when 600 W pulse rating is required; SMAJ48CA suits space-constrained designs where 400 W suffices. |
| ON Semiconductor 1.5SMC48CA | DO-214AB (SMC) package (larger footprint); identical 48 V VWM and 85.5 V VC, but 1500 W PPK rating. | Higher power handling supports harsher environments but requires larger PCB area and higher thermal mass. | Choose SMBJ48CA for SMB footprint compatibility and balanced 600 W performance; 1.5SMC48CA where extreme surge immunity justifies SMC size. |
Compared with SMAJ48CA and 1.5SMC48CA, SMBJ48CA uniquely delivers 600 W surge capability in the compact DO-214AA (SMB) footprint - optimizing board space, cost, and automotive-grade transient immunity without over-engineering or under-specifying.
Availability
SMBJ48CA is available at Aetrix Electronics and suitable for automotive electronics, industrial communication interfaces, LED lighting drivers, and smart metering systems requiring stable component supply and full ISO 7637-2 compliance.
Supply support for SMBJ48CA 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 analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SMBJ series was developed specifically for high-reliability surface-mount surge protection in automotive and industrial environments - emphasizing tight VBR tolerance, low leakage, and standardized DO-214AA packaging for automated assembly.
FAQ
What is the clamping voltage of SMBJ48CA under a 10/1000 µs surge?
The SMBJ48CA has a maximum clamping voltage (VC) of 85.5 V when subjected to a 10/1000 µs waveform at 7.3 A peak pulse current. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry sees no more than 85.5 V during standardized surge events - a critical parameter for protecting 36 V-rated DC-DC controllers and microcontrollers in automotive applications. The SMBJ48CA maintains this clamping performance across its full operating temperature range.
Is SMBJ48CA unidirectional or bidirectional, and how does that affect circuit placement?
SMBJ48CA is a bidirectional TVS diode, indicated by the "CA" suffix, meaning it provides symmetrical clamping in both polarities - essential for protecting AC-coupled lines, differential buses like RS-485, or floating power domains. Unlike unidirectional variants (e.g., SMBJ48A), SMBJ48CA requires no orientation during placement; either terminal connects to the protected line and the other to ground or return, eliminating risk of reverse installation. This simplifies layout and improves reliability in high-mix manufacturing.
Does SMBJ48CA meet automotive transient immunity standards?
Yes, SMBJ48CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground bounce). Its 600 W peak pulse power rating, sub-1 ps response time, and verified clamping behavior under these waveforms make it suitable for engine control units, body control modules, and infotainment power inputs - confirmed in Taiwan Semiconductor's official test reports for the SMBJ series.
What is the maximum operating temperature for SMBJ48CA?
The SMBJ48CA has a maximum junction temperature (TJ) of +150 °C and a storage temperature range of −55 °C to +150 °C. Its thermal resistance values - RθJC = 10 °C/W and RθJA = 55 °C/W - allow safe operation at full 600 W surge rating in ambient temperatures up to +85 °C when mounted on standard 1 oz copper PCBs with adequate thermal relief. This makes SMBJ48CA appropriate for under-hood automotive and industrial control cabinet applications.
How does the DO-214AA (SMB) package of SMBJ48CA compare to DO-214AB (SMC) or DO-214AC (SMA)?
The DO-214AA (SMB) package of SMBJ48CA measures 4.57 mm × 3.94 mm × 2.29 mm - smaller than DO-214AB (SMC: 7.11 mm × 6.22 mm) but larger than DO-214AC (SMA: 4.57 mm × 2.92 mm). This gives SMBJ48CA better power handling than SMA-packaged equivalents (e.g., SMAJ48CA) while retaining compactness for dense layouts. Its J-STD-020 Level 1 moisture sensitivity and matte tin plating ensure compatibility with standard lead-free reflow profiles without baking.
SMBJ48CA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 2
- Voltage - Reverse Standoff (Typ):
- 48V
- Voltage - Breakdown (Min):
- 53.3V
- Voltage - Clamping (Max) @ Ipp:
- 77.4V
- Current - Peak Pulse (10/1000µs):
- 7.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- Yes
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ48CA FAQ
1.How can I place an order for SMBJ48CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ48CA 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 SMBJ48CA reliable?
The price and inventory of SMBJ48CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ48CA is usually 5 days.
3.What payment methods are accepted for SMBJ48CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ48CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ48CA?
SMBJ48CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ48CA 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 SMBJ48CA?
For technical support, including SMBJ48CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ48CA requirements.
6.How does Aetrix verify that SMBJ48CA is sourced from the original manufacturer or authorized distributors?
All SMBJ48CA 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 SMBJ48CA meets industry standards.
7.What is the process for return or replacement of SMBJ48CA?
All SMBJ48CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ48CA, 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 SMBJ48CA part is unused and in its original packaging.
Return procedure for SMBJ48CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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