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Taiwan Semiconductor Corporation SMBJ75CA
- Part No.:
- SMBJ75CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ75CA.pdf
- Description:
- TVS DIODE 75VWM 121VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:22,433
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Product details
Overview
SMBJ75CA 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 75 V working stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR), 121 V maximum clamping voltage (VC) at 5.2 A peak impulse current (IPP), and 600 W peak pulse power rating with DO-214AA (SMB) package.
For engineers reviewing the SMBJ75CA datasheet, SMBJ75CA pinout, SMBJ75CA application, or SMBJ75CA equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, unidirectional vs. bidirectional configuration (CA suffix denotes bipolar), and thermal derating above 25°C ambient per RθJA = 55°C/W.
Technical Context
The SMBJ75CA employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and low leakage (<1 µA at 75 V). Its bidirectional architecture enables symmetric clamping in both polarities without external polarity management, making it suitable for AC-coupled interfaces and floating bus lines.
It operates across –55°C to +150°C junction temperature range, with thermal resistance of 10°C/W (junction-to-case) and 55°C/W (junction-to-ambient), supporting reliable operation in automotive and industrial environments where thermal cycling and sustained surge stress are common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 83.3 V / 92.1 V @ 1 mA - Confirmed breakdown threshold range defining turn-on consistency |
| VC @ IPP | 121 V @ 5.2 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak non-repetitive surge power handling capability per IEC 61000-4-5 |
| ID @ VWM | <1 µA - Low leakage preserves system standby current and prevents false triggering |
| TJ max | +150°C - Enables use in under-hood automotive or high-temperature industrial enclosures |
| RθJA | 55°C/W - Determines required PCB copper area and airflow for thermal management |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; dual-terminal configuration (anode/cathode) for bidirectional operation - terminals are symmetrical and polarity-agnostic in CA variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (marked side) | Transient return path | Provides low-impedance path to ground or rail during positive or negative transients |
| Cathode (band side) | Transient return path | Identical functional role as anode in bidirectional CA devices; no polarity dependency |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over lifetime and humidity exposure per J-STD-020 moisture level 1 |
| Fast response time <1.0 ps | Clamps ESD events before sensitive logic or analog circuitry sustains damage |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive load-dump and inductive-switching immunity compliance |
| Halogen-free & RoHS compliant | Supports environmental compliance requirements for EU, China RoHS, and JEDEC standards |
| UL 94V-0 molding compound | Prevents flame propagation in high-power fault conditions on PCB |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V CAN or LIN bus power inputs against load dump and alternator transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed between VCC and GND to clamp surges before they reach power management ICs or transceivers. Use Value: Limits clamped voltage to 121 V, preventing overvoltage failure of 36 V-rated regulators and ensuring ISO 7637-2 compliance. | Use Scenario: Safeguarding 4–20 mA current-loop sensor outputs from EFT and lightning-induced surges. IC Role / Device Role / Timing Role: Placed across output terminals to shunt transient energy while preserving loop accuracy during normal operation. Use Value: Sub-µA leakage at 75 V avoids loading the precision current source; 600 W rating handles repetitive EFT bursts. |
| LED Driver Input Protection | AC-DC Adapter Secondary-Side Clamp |
Use Scenario: Shielding constant-current LED driver ICs from input surge during hot-plug or grid fluctuations. IC Role / Device Role / Timing Role: Connected across input capacitor to absorb 10/1000 µs surges before reaching switching controller and gate drivers. Use Value: 121 V clamping ensures MOSFETs and controllers rated for 150 V remain within safe SOA limits. | Use Scenario: Clamping secondary-side rectifier output in isolated AC-DC adapters subjected to line transients. IC Role / Device Role / Timing Role: Mounted across output rail to protect post-regulation LDOs and microcontrollers from reflected surges. Use Value: Bidirectional behavior accommodates reverse-polarity test conditions; DO-214AA footprint supports automated assembly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ75CA | Same DO-214AC (SMA) package; 125 V VC @ 5.0 A; slightly higher clamping voltage | Lower power density due to SMA thermal resistance (RθJA = 65°C/W vs. SMB's 55°C/W) | Preferred when legacy SMA footprint is fixed; verify thermal margin at full 600 W derating. |
| ON Semiconductor SMCJ75CA | DO-214AB (SMC) package; 120 V VC @ 5.3 A; higher thermal mass (RθJA = 40°C/W) | Requires larger PCB pad area; better for sustained surge duty but less space-efficient | Chosen when higher single-pulse energy tolerance (1500 W) and lower thermal resistance are critical. |
Compared with SMBJ75CA, SMAJ75CA offers identical electrical function in a smaller SMA package but with reduced thermal performance, while SMCJ75CA delivers superior thermal handling in a larger SMC outline - selection depends on board space, layout constraints, and thermal budget.
Availability
SMBJ75CA is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor front-ends, LED lighting drivers, and AC-DC adapter secondary-side protection requiring stable component supply and full traceability.
Supply support for SMBJ75CA 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs since 1979.
The SMBJ series was developed specifically for AEC-Q200-compliant automotive and harsh-environment industrial surge protection, emphasizing robustness, tight parameter distribution, and halogen-free reliability.
FAQ
What does the 'CA' suffix indicate in SMBJ75CA?
The 'CA' suffix in SMBJ75CA denotes a bidirectional configuration - meaning the device functions identically in both forward and reverse bias, providing symmetrical clamping for AC signals or floating buses. Unlike unidirectional 'A' variants, SMBJ75CA has no polarity-dependent mounting requirement and meets all electrical specs in either orientation.
What is the maximum clamping voltage of SMBJ75CA and under what test condition?
The maximum clamping voltage of SMBJ75CA is 121 V, measured at a peak impulse current (IPP) of 5.2 A using the standard 10/1000 µs double-exponential surge waveform defined in IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents worst-case voltage seen by downstream components during surge events.
Is SMBJ75CA compliant with automotive surge immunity standards?
Yes, SMBJ75CA meets ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b for automotive electrical disturbances, validated through standardized surge waveforms and clamping performance. Its 600 W rating, low leakage, and –55°C to +150°C operating range align with AEC-Q200 stress requirements for transient suppression in vehicle ECUs and body electronics.
How does SMBJ75CA differ from SMBJ75A?
SMBJ75A is unidirectional with a defined cathode band and conducts only in reverse bias; SMBJ75CA is bidirectional with symmetrical characteristics in both directions. Electrically, SMBJ75CA has identical VWM (75 V), VBR (83.3–92.1 V), and VC (121 V), but its marking, testing, and application context assume AC or polarity-agnostic placement - no cathode orientation is required.
What is the thermal resistance and how does it affect SMBJ75CA layout?
SMBJ75CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W in standard JEDEC PCB mounting conditions. This means each watt of dissipated surge energy raises the junction temperature by 55°C above ambient - requiring adequate copper pour, thermal vias, and spacing from heat sources to maintain TJ ≤ 150°C during repeated surges or elevated ambient temperatures.
SMBJ75CA 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 5A
- 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)
SMBJ75CA FAQ
1.How can I place an order for SMBJ75CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ75CA 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 SMBJ75CA reliable?
The price and inventory of SMBJ75CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ75CA is usually 5 days.
3.What payment methods are accepted for SMBJ75CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ75CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ75CA?
SMBJ75CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ75CA 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 SMBJ75CA?
For technical support, including SMBJ75CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ75CA requirements.
6.How does Aetrix verify that SMBJ75CA is sourced from the original manufacturer or authorized distributors?
All SMBJ75CA 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 SMBJ75CA meets industry standards.
7.What is the process for return or replacement of SMBJ75CA?
All SMBJ75CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ75CA, 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 SMBJ75CA part is unused and in its original packaging.
Return procedure for SMBJ75CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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