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Vishay General Semiconductor - Diodes Division SMBJ43CA-M3/5B
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- Part No.:
- SMBJ43CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CA-M3/5B.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,650
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Product details
Overview
SMBJ43CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection on signal and power lines. It features a 43 V standoff voltage (VWM), 69.4 V maximum clamping voltage (VC) at 8.6 A peak pulse current, and 600 W peak pulse power dissipation with a 10/1000 µs waveform - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ43CA-M3/5B datasheet, SMBJ43CA-M3/5B pinout, SMBJ43CA-M3/5B application, or SMBJ43CA-M3/5B equivalent, key selection criteria include bidirectional clamping symmetry, low leakage (<1.0 µA at 43 V), MSL Level 1 moisture sensitivity, halogen-free RoHS compliance, and DO-214AA package compatibility with automated SMT assembly.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: during transients exceeding 43 V, it avalanches symmetrically in both directions to clamp the line within 1.0 ns response time. Its glass-passivated junction ensures stable breakdown behavior across -55 °C to +150 °C operating range and supports repetitive surge duty cycles up to 0.01 %.
The device delivers consistent clamping performance under standardized 10/1000 µs surge waveforms, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), enabling reliable operation on standard 5.0 mm × 5.0 mm copper pads without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off) | 43 V - Maximum continuous reverse voltage before conduction begins; defines safe operating margin below clamping threshold. |
| VBR (Breakdown, min/max) | 47.8 V / 52.8 V at 1.0 mA - Confirmed avalanche onset range; ensures predictable turn-on across production lot. |
| VC (Clamping, max) | 69.4 V at IPPM = 8.6 A - Peak line voltage seen by protected IC during worst-case 10/1000 µs surge; limits stress on downstream components. |
| IPPM (Peak Pulse Current) | 8.6 A - Maximum non-repetitive surge current handled at rated clamping voltage; validated per Fig. 3 waveform. |
| PPPM | 600 W - Peak transient power absorbed for 10/1000 µs pulses; enables protection against lightning-induced and inductive-switching transients. |
| ID (Leakage) | <1.0 µA at 43 V - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| TJ Range | -55 °C to +150 °C - Full industrial temperature coverage; supports deployment in automotive engine bays and outdoor telecom enclosures. |
Pinout & Package
Package: SMB (DO-214AA) - Surface-mount, low-profile plastic case with matte tin-plated leads; meets UL 94 V-0 flammability rating and J-STD-002 solderability requirements. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Common terminal for bidirectional conduction | No polarity marking required; symmetrical structure allows placement without orientation check in PCB layout. |
| Anode | Common terminal for bidirectional conduction | Electrically identical to cathode in bidirectional configuration; terminals interchangeable in circuit design. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN bus) without polarity constraints. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when mounted per recommended 5.0 mm × 5.0 mm pad layout. |
| MSL Level 1 rating | Zero floor-life limitation; supports unlimited exposure to ambient humidity prior to reflow, eliminating bake-out requirements. |
| Halogen-free & RoHS-compliant | M3 suffix confirms compliance with JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU, including absence of brominated flame retardants. |
| 1.0 ns response time | Sub-nanosecond avalanche initiation protects fast-edge digital interfaces (e.g., USB 2.0, Ethernet PHYs) before transient energy couples into IC pins. |
Applications
| Industrial Sensor Interface | Telecom Line Protection |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor drive noise and relay switching transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed directly at connector entry point to divert surge energy before reaching precision ADC or microcontroller GPIO. Use Value: Clamps induced spikes to ≤69.4 V, preventing latch-up or gate oxide damage in 3.3 V/5 V interface ICs while maintaining <1.0 µA leakage at 43 V operating bias. | Use Scenario: Safeguarding twisted-pair data lines (e.g., T1/E1, xDSL) against lightning-induced surges and power cross events in central office and CPE equipment. IC Role / Device Role / Timing Role: Bidirectional voltage clamp installed differential-mode across line pairs, coordinated with gas discharge tubes for staged protection. Use Value: Symmetric 47.8–52.8 V breakdown ensures equal clamping on positive/negative half-cycles, preserving signal integrity in full-duplex communication links. |
| Automotive Body Control Module | Consumer Power Adapter Input |
Use Scenario: Suppressing load dump and ISO 7637-2 pulse 5a/b transients on 12 V supply rails feeding BCM microcontrollers and LIN transceivers. IC Role / Device Role / Timing Role: Primary clamping device on main power input, positioned upstream of DC-DC converters and LDOs to limit bus overvoltage. Use Value: Withstands 100 A surge (IFSM) and maintains stable VC across -40 °C to +125 °C ambient, meeting AEC-Q101 qualification when ordered as HM3 variant. | Use Scenario: Protecting AC-DC adapter primary-side rectifier outputs and secondary-side 5 V/12 V rails against ESD and fast transient bursts during plug insertion or cable coupling. IC Role / Device Role / Timing Role: Secondary-side TVS placed between DC output and USB/power delivery ports to absorb contact discharge events per IEC 61000-4-2. Use Value: Low 69.4 V clamping prevents overvoltage shutdown in USB PD controllers; halogen-free M3 construction satisfies consumer safety and environmental regulations. |
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-E3/5B | RoHS-compliant but not halogen-free; uses standard SnPb-free matte tin plating without brominated flame retardant restriction. | Approved for commercial-grade industrial use but excluded from automotive or green-certified consumer products requiring halogen-free materials. | Select when halogen-free content is not mandated and cost optimization is prioritized over material sustainability reporting. |
| SAC43CA | Same VWM/VC specs but in SMC (DO-214AB) package - larger footprint (7.11 mm × 6.22 mm) and higher thermal mass; RθJA = 50 °C/W. | Better suited for high-power surge environments (e.g., PoE injectors) where 600 W must be sustained over multiple pulses with minimal derating. | Choose when board space permits larger package and thermal performance outweighs SMT placement density requirements. |
Compared with SMBJ43CA-E3/5B, the M3 version adds halogen-free compliance for regulated markets; versus SAC43CA, the SMBJ43CA-M3/5B offers tighter board area usage and faster assembly but requires careful thermal pad design to maintain 600 W capability.
Availability
SMBJ43CA-M3/5B is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, automotive body control modules, and consumer power adapter inputs requiring stable component supply across long-lifecycle programs.
Supply support for SMBJ43CA-M3/5B 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability, power efficiency, and ruggedized packaging.
The SMBJ series was engineered specifically for high-energy transient suppression in space-constrained surface-mount applications - balancing clamping precision, surge robustness, and automated manufacturing compatibility across automotive, industrial, and communications end markets.
FAQ
What is the clamping voltage of SMBJ43CA-M3/5B at its rated peak pulse current?
The SMBJ43CA-M3/5B has a maximum clamping voltage (VC) of 69.4 V when subjected to its rated peak pulse current of 8.6 A using the standardized 10/1000 µs waveform. This value is measured under defined test conditions per Figure 1 and Table 1 of Vishay document 88392, ensuring repeatable protection performance across production lots. The SMBJ43CA-M3/5B achieves this clamping level while maintaining sub-1.0 µA leakage at 43 V standoff, making it suitable for sensitive analog and digital interfaces.
Is SMBJ43CA-M3/5B suitable for bidirectional signal line protection?
Yes, SMBJ43CA-M3/5B is explicitly designed as a bidirectional TVS diode - confirmed by the "CA" suffix and electrical characteristics applying identically in both directions per Vishay documentation. Its symmetric breakdown (47.8 V to 52.8 V) and clamping behavior enable direct placement across differential pairs like RS-485, CAN, or LVDS without polarity concerns. The SMBJ43CA-M3/5B does not require external orientation verification during placement, simplifying layout and reducing assembly errors in high-speed communication systems.
Does SMBJ43CA-M3/5B meet automotive qualification standards?
The base SMBJ43CA-M3/5B is commercial-grade and not AEC-Q101 qualified; however, Vishay offers the HM3 variant (e.g., SMBJ43CAHM3_B/I) which carries full AEC-Q101 qualification for automotive applications. The M3 suffix alone indicates halogen-free RoHS compliance but does not imply automotive qualification. Engineers requiring automotive use must specify the HM3 ordering code with appropriate revision suffix (e.g., "_B" or "_I") - the SMBJ43CA-M3/5B itself is intended for industrial and telecom applications where extended temperature operation (-55 °C to +150 °C) is needed but formal automotive certification is not mandated.
What is the thermal resistance of SMBJ43CA-M3/5B, and how does it affect PCB layout?
SMBJ43CA-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead resistance (RθJL) of 20 °C/W when mounted on minimum recommended 5.0 mm × 5.0 mm copper pads per terminal. This means effective heat dissipation relies heavily on adequate copper area - reducing pad size increases thermal impedance and may cause premature thermal runaway during repetitive surges. For reliable 600 W pulse handling, the SMBJ43CA-M3/5B must be placed per Vishay's mounting pad layout in Document 88392, with no thermal relief on leads and direct connection to internal ground/power planes.
How does the M3 suffix differ from E3 in SMBJ43CA-M3/5B?
The M3 suffix in SMBJ43CA-M3/5B denotes halogen-free, RoHS-compliant construction - specifically excluding brominated and chlorinated flame retardants per JEDEC J-STD-20 and IEC 61249-2-21. In contrast, the E3 suffix indicates RoHS compliance only, without halogen-free assurance. Both share identical electrical specs and DO-214AA packaging, but SMBJ43CA-M3/5B satisfies stricter environmental mandates such as China RoHS II Annex III and EU Green Public Procurement criteria. The SMBJ43CA-M3/5B is preferred for export to regulated markets and sustainability-focused BOMs.
SMBJ43CA-M3/5B 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):
- 47.8V
- Voltage - Clamping (Max) @ Ipp:
- 69.4V
- Current - Peak Pulse (10/1000µs):
- 8.6A
- 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)
SMBJ43CA-M3/5B FAQ
1.How can I place an order for SMBJ43CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CA-M3/5B 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-M3/5B reliable?
The price and inventory of SMBJ43CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ43CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CA-M3/5B?
SMBJ43CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CA-M3/5B 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-M3/5B?
For technical support, including SMBJ43CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ43CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ43CA-M3/5B 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-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ43CA-M3/5B?
All SMBJ43CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CA-M3/5B, 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-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ43CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CA-M3/5B Tags
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