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Taiwan Semiconductor Corporation SMBJ45CA
- Part No.:
- SMBJ45CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ45CA.pdf
- Description:
- TVS DIODE 45VWM 72.7VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:14,278
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Product details
Overview
SMBJ45CA 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 45 V working stand-off voltage (VWM), 50.0–61.1 V breakdown voltage (VBR), 80.3 V maximum clamping voltage (VC) at 7.8 A peak impulse current, and 600 W peak pulse power rating with DO-214AA (SMB) package - ideal for automotive load-dump and industrial I/O protection.
For engineers reviewing the SMBJ45CA datasheet, SMBJ45CA pinout, SMBJ45CA application, or SMBJ45CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, <1.0 ps response time, sub-1 µA leakage above 10 V, and UL 94V-0 molded case - all critical for robust front-end protection in harsh environments.
Technical Context
The SMBJ45CA operates as a silicon avalanche diode with glass-passivated junction, enabling fast, repeatable clamping during transients up to 10/1000 µs waveform. Its bidirectional configuration ensures symmetrical protection without polarity sensitivity, supporting both positive and negative surges on the same line.
Thermal performance is defined by 10 °C/W junction-to-case (RθJC) and 55 °C/W junction-to-ambient (RθJA) resistance, allowing reliable operation up to 150 °C junction temperature. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 45 V - Maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min / max | 50.0 V / 61.1 V @ 1 mA - Ensures predictable turn-on across manufacturing lot and temperature |
| VC @ IPP | 80.3 V @ 7.8 A - Clamping voltage limits downstream IC stress during 10/1000 µs surge events |
| PPK | 600 W - Sustains high-energy transients per ISO 7637-2 without degradation |
| IR @ VWM | <1 µA - Negligible leakage preserves battery life and signal integrity in low-power systems |
| Package | DO-214AA (SMB) - Industry-standard surface-mount footprint compatible with automated assembly |
| TJ max | +150 °C - Enables deployment in under-hood automotive and industrial control cabinets |
Pinout & Package
DO-214AA (SMB) package: molded epoxy case with matte tin-plated leads, cathode band marking polarity for unidirectional variants; SMBJ45CA is bidirectional and marked with "MV" code per datasheet - terminals are non-polarized and functionally symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction | No fixed anode/cathode - either terminal serves as input/output for transient suppression |
| Case | Non-connected thermal path | Provides mechanical mounting and heat dissipation via PCB copper pour |
Key Features
| Feature | Design Value |
|---|---|
| Fast response time | <1.0 ps - Limits voltage overshoot before protection engages, critical for protecting 3.3 V/5 V logic |
| ISO 7637-2 compliance | Pulse 1/2a/2b/3a/3b - Validated for automotive supply-line transient immunity per OEM requirements |
| RoHS & halogen-free | Meets IEC 61249-2-21 - Supports environmentally compliant manufacturing and end-of-life recycling |
| Moisture sensitivity | J-STD-020 Level 1 - No bake requirement prior to reflow, simplifying SMT production flow |
| UL 94V-0 flammability | Molding compound rating - Prevents flame propagation in fault conditions per safety standards |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V vehicle ECUs against load dump and jump-start transients. IC Role / Device Role / Timing Role: Primary clamping element placed upstream of DC-DC converters and microcontrollers. Use Value: Limits rail voltage to ≤80.3 V during 10/1000 µs pulses, preventing latch-up or permanent damage to downstream ASICs. |
Use Scenario: Shielding 4–20 mA current-loop transmitters and RS-485 nodes from EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Bidirectional shunt protector on differential bus lines or analog sensor inputs. Use Value: Symmetrical clamping maintains signal integrity during ±2 kV EFT bursts while adding <1 µA leakage at 45 V bias. |
| LED Driver Input Stage | Smart Meter AC/DC Front-End |
Use Scenario: Safeguarding constant-current LED drivers from inductive switching spikes in streetlight and signage applications. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor to absorb MOSFET flyback energy. Use Value: 600 W peak power rating handles repetitive 100 µs spikes without thermal runaway or parameter shift. |
Use Scenario: Protecting metering SoCs and isolated power supplies from mains-borne surges in utility-grade smart meters. IC Role / Device Role / Timing Role: First-stage transient suppressor on AC input rectifier output or DC bus. Use Value: 150 °C max junction temperature enables operation inside sealed, thermally constrained meter enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ45A (Uni-directional) | Unidirectional; VF = 3.5 V @ 50 A; clamping voltage 72.7 V @ 8.6 A | Requires correct polarity placement; lower VC improves margin for 5 V logic rails | Select SMBJ45A only when circuit polarity is fixed and lower clamping voltage is prioritized over symmetry |
| SMCJ45CA (DO-214AB) | Same electrical specs but larger SMC package; 1500 W PPK rating; RθJA = 35 °C/W | Better thermal performance for high-duty-cycle surges; requires larger PCB area | Choose SMCJ45CA when sustained surge repetition or higher ambient temperatures demand improved thermal headroom |
Compared with SMBJ45CA, SMBJ45A offers tighter clamping but lacks bidirectional flexibility, while SMCJ45CA delivers superior thermal handling at the cost of footprint size - SMBJ45CA balances compactness, symmetry, and 600 W capability for space-constrained industrial and automotive modules.
Availability
SMBJ45CA is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, LED lighting drivers, and smart metering systems requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ45CA 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 for industrial, automotive, and consumer markets.
The SMBJ series was developed to deliver high-reliability, AEC-Q101 qualified transient suppression in compact surface-mount packages - targeting cost-sensitive yet mission-critical protection needs in automotive and industrial control.
FAQ
What is the clamping voltage of SMBJ45CA and how is it measured?
The SMBJ45CA has a maximum clamping voltage (VC) of 80.3 V at 7.8 A peak impulse current (IPP), tested with a 10/1000 µs waveform per ANSI/IEEE C62.35. This value represents the upper limit of voltage seen by downstream circuitry during standardized surge events - critical for verifying safe operating margins of protected ICs.
Is SMBJ45CA unidirectional or bidirectional, and how does that affect circuit layout?
SMBJ45CA is a bidirectional TVS diode, indicated by the "CA" suffix and confirmed by symmetrical VBR and VC specifications in both polarities. Unlike unidirectional variants, it requires no orientation during placement - simplifying layout and eliminating polarity-related assembly errors in differential or AC-coupled paths.
Does SMBJ45CA meet automotive transient immunity standards?
Yes, SMBJ45CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery connection/disconnection), and Pulse 3a/3b (capacitive coupling), making it suitable for front-end protection in automotive body control modules, infotainment systems, and ADAS sensors.
What is the maximum operating temperature for SMBJ45CA and how does it impact reliability?
SMBJ45CA supports a junction temperature range of –55 °C to +150 °C. Its 150 °C maximum TJ enables reliable operation in under-hood automotive environments and sealed industrial enclosures - validated by thermal resistance values of RθJC = 10 °C/W and RθJA = 55 °C/W under standard PCB conditions.
How does SMBJ45CA compare to SMBJ45A in terms of leakage and clamping performance?
SMBJ45CA exhibits ≤1 µA blocking leakage at 45 V (same as SMBJ45A), but its clamping voltage is higher (80.3 V vs. 72.7 V) due to bidirectional architecture. SMBJ45A achieves lower VC by optimizing for single-polarity conduction - making it preferable for fixed-rail 5 V/3.3 V systems where polarity is controlled.
SMBJ45CA 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):
- 45V
- Voltage - Breakdown (Min):
- 50V
- Voltage - Clamping (Max) @ Ipp:
- 72.7V
- Current - Peak Pulse (10/1000µs):
- 8.3A
- 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)
SMBJ45CA FAQ
1.How can I place an order for SMBJ45CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ45CA 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 SMBJ45CA reliable?
The price and inventory of SMBJ45CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ45CA is usually 5 days.
3.What payment methods are accepted for SMBJ45CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ45CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ45CA?
SMBJ45CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ45CA 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 SMBJ45CA?
For technical support, including SMBJ45CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ45CA requirements.
6.How does Aetrix verify that SMBJ45CA is sourced from the original manufacturer or authorized distributors?
All SMBJ45CA 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 SMBJ45CA meets industry standards.
7.What is the process for return or replacement of SMBJ45CA?
All SMBJ45CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ45CA, 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 SMBJ45CA part is unused and in its original packaging.
Return procedure for SMBJ45CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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