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Taiwan Semiconductor Corporation SMBJ40CA
- Part No.:
- SMBJ40CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ40CA.pdf
- Description:
- TVS DIODE 40VWM 64.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,314
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Product details
Overview
SMBJ40CA 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 40 V working stand-off voltage (VWM), 64.5 V maximum clamping voltage (VC@IPP) at 9.7 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time. It is used in automotive infotainment power inputs to suppress load dump and ISO 7637-2 Pulse 5a transients.
For engineers reviewing the SMBJ40CA datasheet, SMBJ40CA pinout, SMBJ40CA application, or SMBJ40CA equivalent, key selection criteria include bidirectional clamping capability, DO-214AA package compatibility, 150°C junction temperature rating, compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and leakage current ≤1 µA at 40 V.
Technical Context
The SMBJ40CA implements a silicon avalanche diode structure with glass-passivated junction for stable breakdown behavior and low leakage. Its bidirectional configuration enables symmetrical clamping in AC-coupled or floating systems without polarity concerns.
It delivers 600 W non-repetitive peak impulse power under 10/1000 µs waveform, with thermal resistance of 55 °C/W (junction-to-ambient) and 10 °C/W (junction-to-case), supporting operation up to 150 °C junction temperature in compact PCB layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min / max | 44.4 V / 49.1 V - Breakdown occurs within this range at 1 mA test current, ensuring reliable turn-on margin |
| VC@IPP | 64.5 V - Clamps transients to ≤64.5 V at 9.7 A peak pulse current (10/1000 µs), protecting downstream ICs |
| PPK | 600 W - Withstands single high-energy surges up to 600 W, meeting IEC 61000-4-5 Level 4 requirements |
| ID@VWM | ≤1 µA - Ultra-low leakage preserves battery life and avoids false triggering in low-power sensor circuits |
| TJ max | 150 °C - Enables use in under-hood automotive environments and industrial enclosures without derating |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.090 g; meets UL 94V-0 and JESD201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (cathode-band side) | Transient return path for negative excursions | Provides symmetrical clamping to ground or rail in bidirectional mode; no polarity sensitivity required |
| Cathode (cathode-band side) | Transient return path for positive excursions | Enables clamp-to-rail or clamp-to-ground configurations without external diode pairing |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and lifetime, with minimal parameter drift during repeated surge events |
| Fast response time <1.0 ps | Clamps ESD events before sensitive CMOS inputs reach destructive voltage thresholds (e.g., USB PHY, CAN transceivers) |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive subsystems including body control modules and lighting drivers subjected to battery line disturbances |
| Moisture sensitivity level 1 | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Input Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed infotainment head unit exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional TVS placed at DC input stage to clamp both positive and negative surges before DC-DC converter. Use Value: Limits voltage to ≤64.5 V during 9.7 A transients, preventing damage to buck controller ICs rated for 65 V absolute maximum. |
Use Scenario: 4–20 mA current loop sensor connected to PLC analog input card in factory automation. IC Role / Device Role / Timing Role: SMBJ40CA shunts induced lightning-induced surges on field wiring to protect precision ADC front-end. Use Value: Clamps 1 kV/1.2–50 µs transients to safe levels while maintaining ≤1 µA leakage at 24 V supply, avoiding measurement offset. |
| LED Driver Overvoltage Protection | USB-C Port ESD Suppression |
Use Scenario: Constant-current LED driver board in streetlight fixture subjected to inductive switching spikes from relay coils. IC Role / Device Role / Timing Role: Placed across output terminals to absorb energy from back-EMF when driving inductive loads. Use Value: Absorbs 600 W peak energy without failure, enabling robust operation per IEC 61000-4-4 Electrical Fast Transient immunity. |
Use Scenario: USB-C receptacle on portable medical device requiring IEC 61000-4-2 Level 4 ESD protection (±15 kV air, ±8 kV contact). IC Role / Device Role / Timing Role: Bidirectional TVS on VBUS and CC lines to suppress ESD without affecting 5–20 V PD negotiation. Use Value: Sub-ns response ensures clamping before transceiver ICs experience latch-up; 40 V VWM avoids interference with USB PD voltage ranges. |
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 SMAJ40CA | Same DO-214AC (SMA) package; 600 W PPK; VBR = 44.4–49.1 V; VC = 64.5 V @ 9.7 A; slightly higher RθJA (65 °C/W) | Compatible in space-constrained designs but requires land pattern revision due to SMA vs SMB footprint | Select if existing design uses SMA footprint or requires Littelfuse qualification pedigree |
| ON Semiconductor 1.5SMC40CA | DO-214AB (SMC) package; 1500 W PPK; VBR = 44.4–49.1 V; VC = 64.5 V @ 23.3 A; larger footprint and higher thermal mass | Better suited for high-repetition surge environments (e.g., motor drives), but overqualified for most 600 W applications | Select only when system-level testing demands >1000 W surge margin or legacy SMC layout reuse is mandatory |
Compared with SMAJ40CA and 1.5SMC40CA, the SMBJ40CA offers optimal balance of 600 W surge handling, DO-214AA footprint compatibility, and ultra-low leakage-making it preferred for automotive and portable electronics where board area and quiescent current are critical.
Availability
SMBJ40CA is available at Aetrix Electronics and suitable for automotive infotainment power inputs, industrial 4–20 mA sensor interfaces, and LED driver overvoltage protection requiring stable component supply across production lifecycles.
Supply support for SMBJ40CA 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 MOSFETs since 1979.
The SMBJ series was developed specifically for AEC-Q101-qualified automotive and industrial surge protection, emphasizing reliability under ISO 7637-2 stress, moisture resilience, and automated assembly compatibility.
FAQ
What is the clamping voltage of SMBJ40CA at its rated peak pulse current?
The SMBJ40CA has a maximum clamping voltage (VC) of 64.5 V when subjected to its rated peak pulse current (IPP) of 9.7 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and ensures downstream components see no more than 64.5 V during transient events. The SMBJ40CA maintains this performance across its full operating temperature range of −55 °C to +150 °C.
Is SMBJ40CA unidirectional or bidirectional, and how is polarity marked?
The SMBJ40CA is a bidirectional TVS diode, indicated by the "CA" suffix per Taiwan Semiconductor's ordering convention. Unlike unidirectional variants (e.g., SMBJ40A), it provides symmetrical clamping in both polarities and has no cathode band marking. Its DO-214AA package is unpolarized-either end may connect to either side of the protected line, simplifying layout and eliminating orientation errors during placement.
Does SMBJ40CA meet automotive surge immunity standards?
Yes, the SMBJ40CA is explicitly validated to meet ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (switching off parallel loads), Pulse 2b (supply interruption), Pulse 3a (capacitive coupling), and Pulse 3b (ground noise) waveforms. Its 600 W peak pulse rating and sub-1 ps response enable robust protection in automotive ECUs, body controllers, and lighting modules without additional circuitry.
What is the maximum leakage current specification for SMBJ40CA at its working voltage?
The SMBJ40CA exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its 40 V working stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage supports long battery life in always-on automotive modules and prevents signal distortion in high-impedance sensor interfaces. Leakage remains ≤5 µA up to 125 °C per thermal derating curves in the official datasheet.
Can SMBJ40CA be used in place of SMBJ40A in an existing design?
No-SMBJ40CA and SMBJ40A are not interchangeable without circuit review. SMBJ40A is unidirectional (cathode-banded) and only clamps positive transients; SMBJ40CA is bidirectional and clamps both polarities. Replacing SMBJ40A with SMBJ40CA may cause unintended conduction in DC-biased rails. Always verify bias conditions and transient polarity requirements before substitution. The SMBJ40CA must be used only where symmetrical clamping is intended.
SMBJ40CA 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):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 64.5V
- Current - Peak Pulse (10/1000µs):
- 9.3A
- 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)
SMBJ40CA FAQ
1.How can I place an order for SMBJ40CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ40CA 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 SMBJ40CA reliable?
The price and inventory of SMBJ40CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ40CA is usually 5 days.
3.What payment methods are accepted for SMBJ40CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ40CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ40CA?
SMBJ40CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ40CA 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 SMBJ40CA?
For technical support, including SMBJ40CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ40CA requirements.
6.How does Aetrix verify that SMBJ40CA is sourced from the original manufacturer or authorized distributors?
All SMBJ40CA 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 SMBJ40CA meets industry standards.
7.What is the process for return or replacement of SMBJ40CA?
All SMBJ40CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ40CA, 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 SMBJ40CA part is unused and in its original packaging.
Return procedure for SMBJ40CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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