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Taiwan Semiconductor Corporation SMBJ43CA
- Part No.:
- SMBJ43CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CA.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,021
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Product details
Overview
SMBJ43CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 43V working stand-off voltage (VWM), and clamps to ≤69.4V at 9.0A peak impulse current (IPP). It protects automotive and industrial power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ43CA datasheet, SMBJ43CA pinout, SMBJ43CA application, or SMBJ43CA equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal resistance (RθJA = 55°C/W), moisture sensitivity level (MSL 1), and RoHS/halogen-free compliance - all critical for ESD and load-dump protection design validation.
Technical Context
The SMBJ43CA is a single-die, bidirectional TVS diode with glass-passivated junction and fast response time (<1.0 ps). Its breakdown voltage (VBR) is specified as 47.8–52.8 V at 1 mA test current, ensuring reliable triggering above 43 V while maintaining low leakage (<1 µA at VWM).
Designed per ANSI/IEEE C62.35, it handles non-repetitive 10/1000 µs surge waveforms up to 600 W and supports junction temperatures from –55°C to +150°C. Its matte tin-plated leads meet J-STD-002 solderability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe system rail margin. |
| VBR min/max | 47.8 / 52.8 V @ 1 mA - Confirmed breakdown range ensures predictable turn-on across temperature and unit variation. |
| VC @ IPP | ≤69.4 V @ 9.0 A - Clamping voltage limits downstream IC stress during 10/1000 µs transients. |
| PPK | 600 W - Peak pulse power rating determines survivability under ISO 7637-2 Pulse 3b (50 V/µs, 100 ns rise). |
| ID @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggers in high-impedance sensing circuits. |
| RθJA | 55 °C/W - Enables thermal design for PCB layouts with limited copper area in automotive junction boxes. |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated placement and reflow profiles. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with cathode band marking; polarity-sensitive for unidirectional variants, but SMBJ43CA is bidirectional - cathode band indicates terminal symmetry, not polarity direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | Both terminals function identically; no DC polarity dependency - enables placement without orientation check on PCB. |
| Case (exposed lead frame) | Thermal and mechanical interface | Provides primary heat path to PCB copper; requires ≥25 mm² thermal pad for full 600 W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over 1000+ surge cycles and prevents parameter drift in humid environments. |
| Response time <1.0 ps | Clamps before most microcontroller I/O pins can be damaged by ESD or fast transients (e.g., relay bounce). |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive power line immunity testing - no additional filtering needed for basic CAN/LIN bus protection. |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; supports standard SMT assembly without dry-pack handling. |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU Directive 2011/65/EU - suitable for export to regulated markets. |
Applications
| Automotive Power Rail Protection | Industrial PLC Input Protection |
|---|---|
Use Scenario: 12 V battery line in engine control unit exposed to load dump (ISO 7637-2 Pulse 5a) and alternator ripple. IC Role / Device Role / Timing Role: Bidirectional clamping device placed upstream of LDOs and MCU power inputs. Use Value: Limits transient voltage to ≤69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic supplies. |
Use Scenario: 24 V digital input module receiving signals from field sensors subject to inductive kickback. IC Role / Device Role / Timing Role: Primary overvoltage clamp at connector entry point before optocoupler or Schmitt trigger. Use Value: Absorbs 600 W surges without degradation, enabling >100,000 cycle reliability in factory automation systems. |
| LED Driver Overvoltage Clamp | USB-C Port ESD Suppression |
Use Scenario: Constant-current LED driver board powered from 48 V supply, vulnerable to switching transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across output stage to protect MOSFET gate drivers and current-sense amplifiers. Use Value: Clamps 10/1000 µs spikes to ≤69.4 V within <1 ps, preserving LED string integrity during hot-plug events. |
Use Scenario: USB-C receptacle on portable medical device requiring IEC 61000-4-2 Level 4 (±15 kV air) ESD robustness. IC Role / Device Role / Timing Role: Secondary-level TVS on VBUS line, downstream of primary front-end protection. Use Value: Adds <1 µA leakage at 43 V, avoiding interference with USB PD negotiation while suppressing ±30 kV contact discharges. |
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 SMAJ43CA | Same DO-214AC (SMA) package; 600 W rating; VBR = 47.8–52.8 V; RθJA = 65°C/W (vs. 55°C/W for SMBJ43CA). | Higher thermal resistance reduces power derating margin at elevated ambient temperatures (>85°C). | Select SMBJ43CA when board space allows DO-214AA and thermal performance is critical; SMAJ43CA fits tighter footprints but requires larger thermal relief. |
| ON Semiconductor SMCJ43CA | DO-214AB (SMC) package; 1500 W rating; VBR = 47.8–52.8 V; VC = 69.4 V @ 21.8 A; RθJA = 35°C/W. | Higher surge capacity suits heavy-duty industrial motor drives, but larger footprint may conflict with dense layouts. | Choose SMBJ43CA for cost-sensitive, space-constrained automotive modules where 600 W suffices; SMCJ43CA reserved for high-energy fault environments. |
Compared with SMAJ43CA and SMCJ43CA, SMBJ43CA offers optimal balance of surge capability (600 W), thermal efficiency (55°C/W), and compact DO-214AA footprint - making it preferred for automotive body electronics and industrial sensor nodes where layout density and thermal management are co-constrained.
Availability
SMBJ43CA is available at Aetrix Electronics and suitable for automotive power rail protection, industrial PLC input conditioning, and LED driver overvoltage clamping requiring stable component supply across extended production lifecycles.
Supply support for SMBJ43CA 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-compliant automotive transient suppression, emphasizing MSL 1 handling, ISO 7637-2 compliance, and robust glass-passivated junctions for harsh-environment reliability.
FAQ
What is the maximum clamping voltage of SMBJ43CA at its rated peak pulse current?
The SMBJ43CA has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak impulse current (IPP) of 9.0 A under the standard 10/1000 µs waveform. This value is guaranteed across temperature and unit-to-unit variation per Taiwan Semiconductor's R2104 specification sheet and is critical for ensuring downstream ICs remain below absolute maximum voltage ratings during surge events.
Is SMBJ43CA unidirectional or bidirectional, and how is polarity marked?
SMBJ43CA is a bidirectional TVS diode - it provides symmetrical clamping in both forward and reverse directions, with identical VBR, VC, and IPP characteristics. Unlike unidirectional variants (e.g., SMBJ43A), it carries no functional polarity; the cathode band on the DO-214AA package is retained for mechanical consistency but does not indicate conduction direction. This simplifies PCB layout and eliminates orientation errors during assembly.
Does SMBJ43CA meet automotive transient immunity standards?
Yes, SMBJ43CA meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling and ignition noise) requirements. Its 600 W peak power rating, fast <1.0 ps response, and validated clamping behavior make it suitable for protecting ECUs, body control modules, and infotainment power supplies without supplemental filtering in standard 12 V vehicle architectures.
What is the junction-to-ambient thermal resistance (RθJA) of SMBJ43CA, and why does it matter?
The SMBJ43CA has a junction-to-ambient thermal resistance (RθJA) of 55°C/W under standard JEDEC test conditions (single-layer 1 in² copper pad). This value directly determines how much the junction temperature rises during surge events - for example, absorbing 600 W even briefly raises TJ by 33°C above ambient. Accurate RθJA enables thermal derating calculations per Fig.2 in the datasheet to ensure operation stays within the 150°C TJMAX limit.
Can SMBJ43CA replace SMBJ43A in an existing design?
No - SMBJ43CA and SMBJ43A are not interchangeable. SMBJ43A is unidirectional (anode-cathode asymmetric), while SMBJ43CA is bidirectional (symmetric). Substituting one for the other risks incorrect clamping behavior: SMBJ43A would fail to protect against reverse-polarity transients, and SMBJ43CA could allow unintended conduction in DC-biased circuits relying on unidirectional blocking. Always verify circuit topology and transient directionality before replacement.
SMBJ43CA 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):
- 43V
- Voltage - Breakdown (Min):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 8.7A
- 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)
SMBJ43CA FAQ
1.How can I place an order for SMBJ43CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CA 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 SMBJ43CA reliable?
The price and inventory of SMBJ43CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CA is usually 5 days.
3.What payment methods are accepted for SMBJ43CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CA?
SMBJ43CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CA 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 SMBJ43CA?
For technical support, including SMBJ43CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CA requirements.
6.How does Aetrix verify that SMBJ43CA is sourced from the original manufacturer or authorized distributors?
All SMBJ43CA 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 SMBJ43CA meets industry standards.
7.What is the process for return or replacement of SMBJ43CA?
All SMBJ43CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CA, 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 SMBJ43CA part is unused and in its original packaging.
Return procedure for SMBJ43CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CA Tags
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