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Taiwan Semiconductor Corporation SMBJ51CA
- Part No.:
- SMBJ51CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ51CA.pdf
- Description:
- TVS DIODE 51VWM 82.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,689
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Product details
Overview
SMBJ51CA 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 51 V working stand-off voltage (VWM), 91.1 V maximum clamping voltage (VC@IPP) at 6.9 A peak impulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package - deployed in automotive infotainment power inputs and industrial I/O port protection.
For engineers reviewing the SMBJ51CA datasheet, SMBJ51CA pinout, SMBJ51CA application, or SMBJ51CA equivalent, key selection criteria include bidirectional clamping symmetry, sub-1 ps response time, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, low leakage (<1 µA above 10 V), and UL 94V-0 molding compound suitability for reflow-soldered high-reliability PCBs.
Technical Context
The SMBJ51CA implements a planar passivated silicon junction optimized for fast avalanche breakdown under transient overvoltage events. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating circuits without polarity constraints, and its glass-passivated junction ensures stable VBR tolerance (±5% min/max) and low leakage across -55°C to +150°C operating range.
Thermal design is supported by RθJA = 55°C/W and RθJC = 10°C/W, enabling reliable operation at up to 3 W steady-state dissipation. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity - confirming compatibility with standard SMT reflow profiles without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 51 V - Maximum continuous DC or RMS voltage the device blocks without conduction; sets minimum system operating margin before clamping. |
| VBR min/max | 56.7 V / 69.3 V @ IT = 1 mA - Confirmed breakdown threshold range ensuring predictable turn-on during transients. |
| VC@IPP | 91.1 V @ IPP = 6.9 A (10/1000 µs) - Clamped voltage seen by protected circuit under standardized surge; defines worst-case stress on downstream ICs. |
| PPK | 600 W - Peak non-repetitive surge energy handling capacity; validates robustness against ISO 7637-2 Pulse 5a (load dump) surges. |
| ID@VWM | <1 µA - Ultra-low reverse leakage at rated stand-off voltage, critical for battery-powered or high-impedance sensing nodes. |
| Response time | <1.0 ps - Avalanche initiation speed enabling effective suppression of ESD (IEC 61000-4-2) and EFT (IEC 61000-4-4) events. |
| Package | DO-214AA (SMB) - Industry-standard surface-mount outline with 0.090 g mass, matte tin-plated leads, and UL 94V-0 flammability rating. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; dual axial terminals suitable for automated placement and reflow soldering. Polarity is marked by a single band indicating cathode for unidirectional variants; SMBJ51CA is bidirectional and uses symmetric terminal roles - both terminals function identically as clamping electrodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Either terminal serves as anode or cathode depending on instantaneous polarity of transient - no fixed polarity assignment required. |
| Terminal 2 | Anode/Cathode (bidirectional) | Electrically identical to Terminal 1; symmetric layout enables placement flexibility and eliminates orientation constraints on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC-coupled, floating, or differential signal paths without external polarity management circuitry. |
| ISO 7637-2 compliance | Validated performance against automotive transient pulses (Pulse 1, 2a, 2b, 3a, 3b), supporting AEC-Q101-qualified designs. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage parameters across temperature and humidity stress conditions. |
| Moisture sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to SMT assembly - reduces manufacturing overhead and floor-life risk. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive requirements for environmentally compliant electronics production. |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs of telematics control units (TCUs) against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and LDOs to limit bus voltage excursion below 100 V. Use Value: SMBJ51CA's 91.1 V clamping voltage ensures downstream regulators remain within absolute maximum ratings during ISO 7637-2 Pulse 5a events. |
Use Scenario: Safeguarding 4–20 mA current-loop sensor interfaces in PLC analog input modules from field-induced surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across loop terminals to shunt common-mode transients while preserving signal integrity. Use Value: Symmetric 56.7–69.3 V breakdown enables equal clamping in either direction, eliminating need for dual unidirectional devices. |
| USB Port ESD Protection | LED Driver Supply Rail Protection |
Use Scenario: Secondary-level ESD protection on USB 2.0 VBUS line in embedded host controllers exposed to user-accessible ports. IC Role / Device Role / Timing Role: Standoff-rated TVS absorbing IEC 61000-4-2 ±8 kV contact discharge energy before it reaches USB PHY ICs. Use Value: Sub-1 ps response time ensures clamping initiates before ESD pulse edge propagates into sensitive transceivers. |
Use Scenario: Overvoltage protection on constant-current LED driver outputs subjected to inductive kickback from relay-controlled loads. IC Role / Device Role / Timing Role: Parallel-connected TVS limiting output rail overshoot during switching transitions in outdoor signage systems. Use Value: 600 W peak power rating sustains multiple 10/1000 µs surges without degradation, extending field lifetime. |
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 SMAJ51CA | Same DO-214AC (SMA) package; 93.6 V VC@IPP (vs. 91.1 V); 500 W PPK rating (vs. 600 W). | Lower surge rating limits use in high-energy automotive load-dump scenarios; acceptable for IEC 61000-4-5 Level 3 (4 kV) only. | Select when footprint compatibility with SMA package is prioritized over peak power margin. |
| ON Semiconductor SMCJ51CA | DO-214AB (SMC) package; 93.6 V VC@IPP; 1500 W PPK; higher thermal mass but larger board area. | Superior energy handling supports harsher transients (e.g., ISO 7637-2 Pulse 5a up to 170 V), but requires PCB redesign. | Choose when system-level surge testing exceeds 600 W requirements and board space allows SMC footprint. |
Compared with SMAJ51CA and SMCJ51CA, the SMBJ51CA delivers optimal balance of 600 W surge capability, SMB footprint compactness, and 91.1 V clamping - making it preferred for space-constrained automotive and industrial modules where both size and robustness are critical.
Availability
SMBJ51CA is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial I/O protection, USB VBUS hardening, and LED driver supply rail safeguarding requiring stable component supply and full traceability.
Supply support for SMBJ51CA 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, rectifiers, and MOSFETs - headquartered in Hsinchu, Taiwan.
The SMBJ series was developed to deliver high-reliability, AEC-Q101-aligned transient protection in compact surface-mount packages for automotive, industrial, and communications infrastructure applications.
FAQ
What is the clamping voltage of SMBJ51CA under a 10/1000 µs surge?
The SMBJ51CA has a maximum clamping voltage (VC) of 91.1 V when subjected to a 10/1000 µs waveform at a peak impulse current (IPP) of 6.9 A. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during standardized surge events - critical for ensuring downstream ICs remain within safe operating voltage ranges.
Is SMBJ51CA unidirectional or bidirectional?
SMBJ51CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. It provides symmetrical clamping in both polarities, making it suitable for AC-coupled lines, differential buses, or floating grounds where polarity cannot be assumed - unlike unidirectional variants (e.g., SMBJ51A) that require correct orientation.
Does SMBJ51CA meet automotive transient standards?
Yes, SMBJ51CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (ground bounce). Its 600 W peak power rating and verified clamping behavior support AEC-Q101-compliant system designs in automotive ECUs and body control modules.
What is the maximum operating temperature for SMBJ51CA?
The SMBJ51CA has a maximum junction temperature (TJ) of +150°C and a storage temperature range of -55°C to +150°C. Its RθJA of 55°C/W allows thermal design for ambient temperatures up to +85°C in typical PCB layouts - validated for continuous operation in engine bay and industrial control cabinet environments.
What packaging and moisture sensitivity level does SMBJ51CA have?
SMBJ51CA is supplied in DO-214AA (SMB) package on 3,000-piece tape-and-reel format and carries J-STD-020 Moisture Sensitivity Level 1 - meaning it can be stored indefinitely at ≤30°C/85% RH and placed directly into standard reflow ovens without baking or dry-pack requirements, simplifying SMT line integration.
SMBJ51CA 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:
- 1
- Voltage - Reverse Standoff (Typ):
- 51V
- Voltage - Breakdown (Min):
- 56.7V
- Voltage - Clamping (Max) @ Ipp:
- 82.4V
- Current - Peak Pulse (10/1000µs):
- 7.3A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ51CA FAQ
1.How can I place an order for SMBJ51CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ51CA 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 SMBJ51CA reliable?
The price and inventory of SMBJ51CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ51CA is usually 5 days.
3.What payment methods are accepted for SMBJ51CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ51CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ51CA?
SMBJ51CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ51CA 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 SMBJ51CA?
For technical support, including SMBJ51CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ51CA requirements.
6.How does Aetrix verify that SMBJ51CA is sourced from the original manufacturer or authorized distributors?
All SMBJ51CA 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 SMBJ51CA meets industry standards.
7.What is the process for return or replacement of SMBJ51CA?
All SMBJ51CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ51CA, 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 SMBJ51CA part is unused and in its original packaging.
Return procedure for SMBJ51CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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