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STMicroelectronics SMBJ43CA-TR
- Part No.:
- SMBJ43CA-TR
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CA-TR.pdf
- Description:
- TVS DIODE 43VWM SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,582
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Product details
Overview
SMBJ43CA-TR from STMicroelectronics is a bidirectional transient voltage suppression (TVS) diode in SMB package, designed for IEC 61000-4-2 ESD and IEC 61000-4-4 surge protection of signal/power lines. It features 43 V standoff voltage (VRM), 68.1 V clamping voltage at 9.7 A (10/1000 µs), 600 W peak pulse power, 0.2 µA max leakage at 25 °C, and operates up to 150 °C junction temperature - deployed in industrial PLC I/O modules, telecom line interfaces, and automotive body control units.
For engineers reviewing the SMBJ43CA-TR datasheet, SMBJ43CA-TR pinout, SMBJ43CA-TR application, or SMBJ43CA-TR equivalent, key selection criteria include bidirectional clamping symmetry, low dynamic resistance (0.728 Ω), high-temperature leakage stability, and UL497B recognition for isolated loop circuit protection.
Technical Context
This TVS diode uses planar silicon junction technology to achieve precise breakdown voltage control and stable clamping under repetitive transients. Its bidirectional structure provides symmetrical protection for AC-coupled or floating signal paths without polarity dependency.
Clamping behavior is defined by VCL = 68.1 V at IPP = 9.7 A (10/1000 µs), with dynamic resistance RD = 0.728 Ω and temperature coefficient αT = 10.1 × 10−4/°C - enabling accurate overvoltage margining across −55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Standoff Voltage (VRM) | 43 V - maximum continuous reverse working voltage before significant leakage or conduction begins |
| Breakdown Voltage (VBR min) | 47.8 V at 1 mA - guaranteed minimum voltage at which device enters avalanche conduction |
| Clamping Voltage (VCL) | 68.1 V at 9.7 A (10/1000 µs) - peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Power (PPP) | 600 W (10/1000 µs) - maximum transient energy absorption capability at Tj = 25 °C |
| Leakage Current (IRM) | 0.2 µA at VRM = 43 V, 25 °C - ensures minimal loading on high-impedance sensor or reference circuits |
| Junction Temperature Range | −55 °C to +150 °C - supports operation in under-hood automotive, industrial motor drives, and outdoor telecom enclosures |
| ESD Rating | ±30 kV contact & air discharge (IEC 61000-4-2 Level 4) - exceeds standard immunity requirements for user-accessible ports |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, 2-terminal device with matte tin-plated leads compliant with J-STD-020 MSL level 1 and IPC7531 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Bidirectional) | Reversible transient current path | No polarity marking required; terminals function identically for positive/negative surges |
| Cathode Band (Marking) | Reference orientation indicator | Visible band denotes cathode end per JEDEC outline; irrelevant for bidirectional operation but aids placement verification |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Enables single-device protection of AC signals, differential buses (RS-485, CAN), and floating power rails without polarity concerns |
| Low dynamic resistance (0.728 Ω) | Minimizes voltage overshoot during fast-rising transients (e.g., 8/20 µs lightning surges), improving system-level immunity margin |
| UL497B recognition (E136224) | Validates suitability for isolated loop circuit protection in industrial process instrumentation and safety-critical analog input modules |
| High-temperature leakage stability | 0.2 µA @ 25 °C, <1 µA @ 85 °C ensures reliable signal integrity in thermally stressed environments like motor drive PCBs |
| Planar junction construction | Delivers tight VBR tolerance (±5%), repeatable clamping, and long-term reliability under repeated surge stress in SMPS and telecom applications |
Applications
| Industrial PLC Analog Input Modules | Automotive Body Control Unit (BCU) LIN Bus |
|---|---|
|
Use Scenario: Protecting 4–20 mA current-loop inputs from field-induced surges and ESD events during maintenance or cable handling. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp transients before they reach precision op-amps and ADC front-ends. Use Value: Prevents latch-up or damage to 24-bit sigma-delta ADCs while maintaining <0.1% full-scale error due to sub-µA leakage at 43 V standoff. |
Use Scenario: Safeguarding LIN transceiver pins against battery dump, load dump, and ESD in door module ECUs exposed to humid, salt-laden environments. IC Role / Device Role / Timing Role: Fast-response TVS shunting transients directly at connector entry point, reducing layout inductance impact on clamping performance. Use Value: Maintains LIN bus communication integrity during 100 V/10 ms load dump tests by limiting voltage to <68.1 V at 9.7 A, well below transceiver absolute max rating. |
| Telecom DSL Line Interface Cards | Medical Patient Monitoring ECG Lead Inputs |
|
Use Scenario: Shielding ADSL/VDSL line drivers and receivers from induced surges on twisted-pair copper lines entering building premises. IC Role / Device Role / Timing Role: Bidirectional TVS placed differential-mode across tip/ring, complementing common-mode chokes and gas discharge tubes. Use Value: Achieves >4 kV IEC 61000-4-4 immunity (8/20 µs) with clamping voltage <77.4 V, preserving signal fidelity up to 30 MHz bandwidth. |
Use Scenario: Protecting ultra-high-impedance ECG amplifier inputs from defibrillation pulses and hospital-grade ESD events. IC Role / Device Role / Timing Role: Low-leakage TVS mounted directly at electrode jack to prevent DC offset shift and baseline wander during transient events. Use Value: Sub-0.2 µA leakage at 43 V ensures <10 nA input bias error, critical for detecting microvolt-level cardiac signals without amplification drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA from Vishay (SMBJ43CA-E3/5AT) | VBR min = 47.8 V (same), VCL = 68.1 V at 9.7 A (same), but RD = 0.75 Ω vs. ST's 0.728 Ω; UL497B not claimed | Lacks UL497B recognition; suitable where agency certification is not mandated for isolated loop use | Select when cost sensitivity outweighs need for UL497B compliance in non-safety-critical industrial designs |
| P6SMB43CA from ON Semiconductor | VBR min = 47.8 V (same), VCL = 69.4 V at 8.6 A (10/1000 µs); higher clamping voltage and lower IPP reduces margin for 600 W surges | Lower surge current rating limits effectiveness in high-energy lightning test scenarios (IEC 61000-4-5) | Prefer only if legacy BOM alignment or dual-sourcing mandates ON Semi footprint compatibility |
Compared with Vishay SMBJ43CA and ON Semi P6SMB43CA, the STMicroelectronics SMBJ43CA-TR delivers tighter clamping (68.1 V), lower dynamic resistance, and UL497B certification - making it optimal for certified industrial loop-powered sensors and medical-grade signal conditioning where reliability and regulatory traceability are mandatory.
Availability
SMBJ43CA-TR is available at Aetrix Electronics and suitable for industrial PLC analog inputs, automotive LIN bus nodes, telecom DSL line cards, and medical ECG lead protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ43CA-TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontrollers for industrial, automotive, and consumer markets.
The SMBJ series belongs to ST's high-reliability TVS portfolio, engineered specifically for robust transient suppression in harsh electromagnetic environments - targeting applications demanding UL497B compliance, wide temperature operation, and low-leakage precision protection.
FAQ
What is the difference between SMBJ43CA and SMBJ43A?
SMBJ43CA is bidirectional, providing symmetrical clamping for both positive and negative transients - ideal for AC-coupled lines, differential buses, or floating grounds. SMBJ43A is unidirectional, conducting only in reverse bias and requiring correct polarity installation. Their VBR, VCL, and PPP values are identical, but CA devices eliminate polarity-dependent layout constraints and simplify design for non-DC-biased interfaces.
Does SMBJ43CA-TR meet automotive AEC-Q200 requirements?
No - SMBJ43CA-TR is not AEC-Q200 qualified. It is rated for industrial and commercial applications with Tj = −55 °C to +150 °C and UL497B recognition, but lacks the extended temperature cycling, vibration, and failure analysis testing required for automotive qualification. For AEC-Q200-compliant alternatives, consider ST's Automotive-grade SMAJ43CA or similar qualified variants.
Can SMBJ43CA-TR be used in parallel for higher surge current handling?
Not recommended without derating and matching. Parallel connection introduces imbalance due to VBR tolerances (±5%) and thermal coupling differences, causing one device to absorb disproportionate current and fail prematurely. For >9.7 A surge capability, select a higher-power TVS (e.g., 1.5KE43CA) or verify matched-bin pairing with <0.1 V VBR spread and symmetric PCB layout per ST application note AN4274.
What is the significance of UL497B recognition for SMBJ43CA-TR?
UL497B recognition (file E136224) certifies that SMBJ43CA-TR meets requirements for isolated loop circuit protectors - validating its use in intrinsically safe systems, 4–20 mA transmitter/receiver isolation barriers, and hazardous location interfaces. This enables direct integration into certified industrial safety architectures without additional system-level validation for surge protection functionality.
SMBJ43CA-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- -
- Voltage - Clamping (Max) @ Ipp:
- -
- Current - Peak Pulse (10/1000µs):
- -
- 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:
- SMB
SMBJ43CA-TR FAQ
1.How can I place an order for SMBJ43CA-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CA-TR 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-TR reliable?
The price and inventory of SMBJ43CA-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CA-TR is usually 5 days.
3.What payment methods are accepted for SMBJ43CA-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CA-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CA-TR?
SMBJ43CA-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CA-TR 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-TR?
For technical support, including SMBJ43CA-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CA-TR requirements.
6.How does Aetrix verify that SMBJ43CA-TR is sourced from the original manufacturer or authorized distributors?
All SMBJ43CA-TR 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-TR meets industry standards.
7.What is the process for return or replacement of SMBJ43CA-TR?
All SMBJ43CA-TR units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CA-TR, 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-TR part is unused and in its original packaging.
Return procedure for SMBJ43CA-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CA-TR Tags
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ESD9B5.0ST5G
onsemi
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DESD3V3E1BL-7B
Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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ESD5Z5.0T1G
onsemi
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Diodes Incorporated
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D12V0L1B2LP-7B
Diodes Incorporated
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Nexperia USA Inc.
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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