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Vishay General Semiconductor - Diodes Division SMBJ43CAHM3/I
- Part No.:
- SMBJ43CAHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CAHM3/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,548
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Product details
Overview
SMBJ43CAHM3/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 69.4 V at 8.6 A, and operates across -55 °C to +150 °C junction temperature range - deployed in industrial sensor signal lines and telecom interface protection.
For engineers reviewing the SMBJ43CAHM3/I datasheet, SMBJ43CAHM3/I pinout, SMBJ43CAHM3/I application, or SMBJ43CAHM3/I equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This device functions as a voltage-clamped surge protector with symmetrical bidirectional avalanche breakdown, enabling suppression of transient voltages in both polarities without polarity sensitivity. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, critical for fast response (<1 ns) to ESD and lightning-induced transients.
The SMBJ43CAHM3/I is rated for 600 W peak pulse power under standardized 10/1000 µs waveform, with derating above 25 °C per Fig. 2, and supports repetitive surge duty cycle of 0.01%. Its 1.0 µA max reverse leakage at VWM minimizes standby power loss in always-on circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - maximum continuous reverse operating voltage before clamping begins; defines safe signal swing margin in protected line. |
| VBR (min/max) | 47.8 V / 52.8 V at IT = 1 mA - guaranteed breakdown threshold ensuring predictable turn-on during overvoltage events. |
| VC @ IPPM | 69.4 V at 8.6 A - clamped voltage during 600 W surge; determines maximum stress on downstream ICs. |
| PPPM | 600 W - peak pulse power handling capability under 10/1000 µs waveform; validates protection level against IEC 61000-4-5 surges. |
| RθJA | 100 °C/W - junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs PCB thermal design requirements. |
| TJ max | +150 °C - maximum junction temperature; enables operation in high-ambient industrial environments without derating. |
| Leakage @ VWM | 1.0 µA max - ultra-low reverse current preserves signal integrity and battery life in low-power sensor interfaces. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, MSL Level 1 (260 °C reflow peak), matte tin-plated leads solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Terminal A (bidirectional) | One end of symmetrical PN junction; no polarity marking required; connects to protected line or ground reference point. |
| Cathode | Terminal K (bidirectional) | Other end of symmetrical PN junction; electrically identical to Anode in CA-type devices; forms differential clamp pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| 600 W peak pulse power | Meets IEC 61000-4-5 Level 3 (1 kV line-earth, 2 kV line-line) surge immunity requirements with margin. |
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness - suitable for under-hood ECUs. |
| Low clamping ratio (VC/VBR ≈ 1.37) | Minimizes overvoltage overshoot during transient events, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
| Halogen-free & RoHS-compliant (HM3 suffix) | Complies with IPC-1752A material declaration standards and EU Directive 2011/65/EU for sustainable electronics manufacturing. |
Applications
| Industrial Sensor Signal Protection | Telecom Interface Surge Suppression |
|---|---|
|
Use Scenario: Protecting analog output (4–20 mA) and digital I/O lines of pressure/temperature sensors exposed to motor switching noise and field wiring surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed between signal line and ground, clamping transients before they reach ADC input or microcontroller GPIO. Use Value: Prevents sensor calibration drift and firmware lockup by limiting induced voltage to ≤69.4 V during 8.6 A surges. |
Use Scenario: Shielding RS-485 transceiver pins (A/B) in base station backhaul equipment subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Differential-mode TVS connected across A–B lines and common-mode TVS from each line to chassis ground. Use Value: Maintains data integrity under repeated 600 W transients while preserving signal rise time due to sub-1 ns response. |
| Automotive Body Control Module (BCM) | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding LIN bus communication lines in door module ECUs where inductive loads (actuators, solenoids) generate load-dump spikes. IC Role / Device Role / Timing Role: Bidirectional TVS mounted directly at connector entry point, referenced to vehicle chassis ground. Use Value: Ensures AEC-Q101 compliance and withstands ≥1000 surge cycles without parameter shift or failure. |
Use Scenario: Suppressing commutation spikes from brushed DC motors in washing machine control boards interfacing with MCU PWM outputs. IC Role / Device Role / Timing Role: TVS placed across motor terminals and across H-bridge FET drains/sources to absorb inductive kickback. Use Value: Eliminates false resets and MOSFET avalanche failures by clamping spikes to 69.4 V with <1 ns latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43CAHE3/I | Same electrical specs and SMB package; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker rating. | Preferred for commercial-grade cost-sensitive designs where halogen-free requirement is absent. | Select when AEC-Q101 is unnecessary and BOM cost optimization is prioritized over automotive or green-material compliance. |
| SMAJ43CAHM3 | Lower 400 W PPPM; same VWM/VBR; SMA (DO-214AC) package with smaller footprint and higher RθJA (140 °C/W). | Suitable for space-constrained consumer PCBs with lower surge exposure (e.g., USB port protection). | Choose only if system-level surge testing confirms 400 W is sufficient and thermal margin allows higher junction temperature rise. |
Compared with SMBJ43CAHE3/I, the SMBJ43CAHM3/I adds halogen-free construction and whisker resistance for automotive use; versus SMAJ43CAHM3, it delivers 50% higher surge power and superior thermal performance in identical circuit layouts.
Availability
SMBJ43CAHM3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom infrastructure hardware, and automotive body electronics requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ43CAHM3/I 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, TVS devices, and power MOSFETs with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting industrial automation, automotive subsystems, and communications infrastructure where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ43CAHM3/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ43CAHM3/I provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMBJ43A), SMBJ43CAHM3/I has no cathode marking and functions identically in either orientation - essential for protecting AC-coupled or floating signal paths such as RS-485, CAN, or audio lines where polarity cannot be assumed.
Is SMBJ43CAHM3/I qualified for automotive applications?
Yes, SMBJ43CAHM3/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "_X" revision format) and documentation referencing AEC-Q101 compliance in the Mechanical Data section. This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD robustness - making SMBJ43CAHM3/I suitable for under-hood and cabin modules in passenger vehicles and commercial vehicles.
How does the clamping voltage of SMBJ43CAHM3/I compare to its breakdown voltage?
SMBJ43CAHM3/I exhibits a clamping voltage (VC) of 69.4 V at 8.6 A peak pulse current, while its minimum breakdown voltage (VBR) is 47.8 V at 1 mA test current. The ratio VC/VBR ≈ 1.45 reflects low incremental surge resistance, indicating efficient energy diversion with minimal voltage overshoot - a key advantage over higher-ratio suppressors that risk exceeding downstream IC absolute maximum ratings during transients.
What is the thermal resistance of SMBJ43CAHM3/I, and how does it affect PCB layout?
SMBJ43CAHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 board thickness and no internal copper planes. To maintain TJ ≤ 150 °C under worst-case 600 W pulses, designers must ensure adequate copper area and avoid excessive ambient temperature buildup - underscoring why SMBJ43CAHM3/I is specified for use with defined pad layouts per Vishay's outline drawing.
Can SMBJ43CAHM3/I replace SMBJ43A in an existing design?
No, SMBJ43CAHM3/I cannot directly replace unidirectional SMBJ43A without circuit review: SMBJ43CAHM3/I is bidirectional with no polarity marking, while SMBJ43A requires correct cathode orientation to function. Replacing SMBJ43A with SMBJ43CAHM3/I may cause unintended conduction in DC-biased lines. If bidirectional protection is needed, verify signal path symmetry and confirm no DC blocking capacitors or bias networks conflict with SMBJ43CAHM3/I's dual-polarity behavior before substitution.
SMBJ43CAHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ43CAHM3/I FAQ
1.How can I place an order for SMBJ43CAHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CAHM3/I 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 SMBJ43CAHM3/I reliable?
The price and inventory of SMBJ43CAHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43CAHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ43CAHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CAHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CAHM3/I?
SMBJ43CAHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CAHM3/I 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 SMBJ43CAHM3/I?
For technical support, including SMBJ43CAHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CAHM3/I requirements.
6.How does Aetrix verify that SMBJ43CAHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ43CAHM3/I 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 SMBJ43CAHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ43CAHM3/I?
All SMBJ43CAHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CAHM3/I, 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 SMBJ43CAHM3/I part is unused and in its original packaging.
Return procedure for SMBJ43CAHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CAHM3/I Tags
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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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Diodes Incorporated
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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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