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Vishay General Semiconductor - Diodes Division SMBJ43CD-M3/H
- Part No.:
- SMBJ43CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CD-M3/H.pdf
- Description:
- TVS DIODE 43VWM 68.5VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,124
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Product details
Overview
SMBJ43CD-M3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, with 43 V stand-off voltage (VWM), 48.5–52.1 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamping voltage of 68.5 V at 8.76 A. It protects signal lines and power rails in industrial sensor interfaces against ESD and inductive switching transients.
For engineers reviewing the SMBJ43CD-M3/H datasheet, SMBJ43CD-M3/H pinout, SMBJ43CD-M3/H application, or SMBJ43CD-M3/H equivalent, key selection criteria include bidirectional polarity, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), MSL Level 1 moisture sensitivity, and halogen-free RoHS-compliant construction for high-reliability PCB assembly.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, enabling suppression of positive and negative transients without polarity constraints. Its low incremental surge resistance and fast response time ensure effective clamping during sub-microsecond events such as ESD or relay bounce.
The SMBJ43CD-M3/H is rated for 150 °C maximum junction temperature and derates linearly above 25 °C ambient, with thermal resistance RθJA = 125 °C/W on standard PCB pads. It meets UL 497B recognition (QVGQ2) and complies with ANSI/IEEE C62.35 surge standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 48.5 V / 52.1 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | 68.5 V at 8.76 A - clamping voltage limits downstream IC stress during 600 W transient events |
| PPPM | 600 W (10/1000 μs waveform) - sustains high-energy surges common in industrial motor control and telecom line protection |
| ID @ VWM | <0.5 μA - negligible leakage preserves signal integrity in high-impedance sensor front-ends |
| Package | SMB (DO-214AA) - industry-standard 2-pin SMD outline compatible with automated pick-and-place and reflow |
| MSL Level | Level 1 (J-STD-020) - no dry-pack or bake required prior to assembly, simplifying manufacturing flow |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no cathode band marking. Terminals are matte tin-plated leads, solderable per J-STD-002 and JESD 22-B102, with M3 suffix indicating JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Transient current path | Either terminal accepts surge current in either polarity; no orientation dependency on PCB |
| Case (SMB body) | Thermal conduction path | Mounting pad area directly influences thermal derating-minimum 5.0 mm × 5.0 mm copper recommended |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns |
| ±3.5 % VBR tolerance | Reduces design margin overhead and improves consistency in multi-channel protection schemes |
| 600 W peak pulse rating | Meets IEC 61000-4-5 Level 4 surge immunity requirements for industrial equipment |
| Halogen-free, RoHS-compliant | Supports environmental compliance for global OEM shipments without material declaration exceptions |
| Low leakage <0.5 μA | Maintains accuracy in precision analog sensor circuits where leakage could shift bias points |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting 4–20 mA current loop inputs in PLC analog modules from field-wiring induced transients. IC Role / Device Role / Timing Role: Voltage-clamping TVS placed across input terminals to shunt surge energy before it reaches op-amp or ADC front-end. Use Value: Prevents latch-up or permanent damage to precision instrumentation amplifiers while maintaining <0.5 μA leakage-induced offset error. | Use Scenario: Safeguarding RS-485 transceivers on outdoor telecom base station backhaul links exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary board-level surge suppressor on differential bus lines, coordinated with GDT or MOV secondary protection. Use Value: Clamps 600 W transients within 1 ns to keep bus voltage below transceiver absolute maximum ratings (±12 V), preserving data integrity. |
| Automotive Body Control Module | Consumer Appliance Motor Driver |
Use Scenario: Shielding LIN bus nodes in door module ECUs from load-dump and jump-start voltage spikes. IC Role / Device Role / Timing Role: Bidirectional TVS on LIN signal line to absorb both positive and negative polarity transients without additional polarity logic. Use Value: Eliminates need for dual unidirectional devices, reducing BOM count and PCB area while meeting ISO 16750-2 pulse 5a/b test requirements. | Use Scenario: Protecting gate drive signals of half-bridge MOSFETs in smart washing machine motor inverters from shoot-through-inducing voltage spikes. IC Role / Device Role / Timing Role: Localized clamping element placed near driver IC output pins to suppress Miller-induced ringing and inductive kickback. Use Value: Limits gate-source voltage excursion to ≤68.5 V, preventing unintended MOSFET turn-on and ensuring reliable PWM timing under dynamic load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CA-E3/52 | Same VWM/VBR/PPPM specs; differs in packaging (tape-and-reel vs. bulk), RoHS status (lead-free but not halogen-free), and MSL level (Level 1 vs. unspecified) | No functional difference in circuit protection; may require requalification for halogen-free compliance programs | Select SMBJ43CD-M3/H when halogen-free and JESD 201 Class 2 whisker resistance are mandatory |
| P6SMB43CA | Identical electrical specs and SMB package; differs in manufacturer (Littelfuse), branding, and minor thermal resistance (RθJA = 130 °C/W vs. 125 °C/W) | Drop-in replacement in most designs; requires validation of thermal margin in high-power-density layouts | Choose P6SMB43CA only after confirming layout thermal performance meets derating curve requirements |
Compared with SMBJ43CD-M3/H, SMBJ43CA-E3/52 lacks halogen-free certification and whisker resistance assurance, while P6SMB43CA has slightly higher thermal resistance-both require review of compliance documentation and thermal layout before substitution.
Availability
SMBJ43CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer appliance motor drivers requiring stable component supply and full regulatory compliance.
Supply support for SMBJ43CD-M3/H 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series is designed for robust transient suppression in harsh environments-targeting industrial automation, transportation, and infrastructure systems where surge immunity and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ43CD-M3/H and how does it protect downstream components?
The SMBJ43CD-M3/H clamps at 68.5 V when subjected to its rated 8.76 A peak pulse current (10/1000 μs). This limits the voltage seen by protected ICs-such as RS-485 transceivers or microcontroller GPIOs-to a safe level below their absolute maximum ratings. The low clamping ratio (VC/VWM ≈ 1.59) ensures efficient energy diversion without overstressing adjacent circuitry, making SMBJ43CD-M3/H effective for IEC 61000-4-5 Level 4 surge compliance.
Is SMBJ43CD-M3/H suitable for bidirectional signal lines like RS-485 or CAN bus?
Yes, SMBJ43CD-M3/H is explicitly designed for bidirectional applications-the "CD" suffix denotes symmetrical breakdown characteristics in both polarities. It provides identical clamping performance for positive and negative transients, making it ideal for differential buses including RS-485, RS-422, and CAN physical layers. Its low capacitance (typ. <100 pF) avoids signal integrity degradation at typical industrial data rates up to 10 Mbps.
Does SMBJ43CD-M3/H require special handling or baking before reflow soldering?
No-SMBJ43CD-M3/H is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and can be mounted directly from tape-and-reel without dry-packaging or pre-bake conditioning. Its moisture sensitivity is mitigated by robust molding compound (UL 94 V-0) and matte tin plating compliant with J-STD-002, supporting standard lead-free reflow profiles up to 260 °C peak.
How does the ±3.5 % VBR tolerance of SMBJ43CD-M3/H impact system-level surge design?
The tight ±3.5 % breakdown voltage tolerance ensures consistent clamping onset across production batches, reducing worst-case voltage margin assumptions in system-level surge testing. For SMBJ43CD-M3/H, this means VBR stays between 48.5 V and 52.1 V at 1 mA, allowing designers to set upstream overvoltage detectors or crowbar triggers with tighter thresholds-improving overall protection coordination without over-engineering guardbanding.
Can SMBJ43CD-M3/H replace unidirectional SMBJ43D-M3/H in an existing design?
No-SMBJ43CD-M3/H is bidirectional and lacks a cathode band, whereas SMBJ43D-M3/H is unidirectional with defined polarity. Substituting SMBJ43CD-M3/H for SMBJ43D-M3/H in DC-coupled circuits may cause unintended conduction or failed protection if reverse polarity events are not expected. Always verify signal topology: use SMBJ43CD-M3/H only where true bidirectional transient threat exists, such as AC-coupled or floating lines.
SMBJ43CD-M3/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 43V
- Voltage - Breakdown (Min):
- 48.5V
- Voltage - Clamping (Max) @ Ipp:
- 68.5V
- Current - Peak Pulse (10/1000µs):
- 8.76A
- 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 (SMBJ)
SMBJ43CD-M3/H FAQ
1.How can I place an order for SMBJ43CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CD-M3/H 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 SMBJ43CD-M3/H reliable?
The price and inventory of SMBJ43CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ43CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CD-M3/H?
SMBJ43CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CD-M3/H 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 SMBJ43CD-M3/H?
For technical support, including SMBJ43CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CD-M3/H requirements.
6.How does Aetrix verify that SMBJ43CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ43CD-M3/H 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 SMBJ43CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ43CD-M3/H?
All SMBJ43CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CD-M3/H, 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 SMBJ43CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ43CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CD-M3/H 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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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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