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Vishay General Semiconductor - Diodes Division SMBJ43CAHM3_A/I
- Part No.:
- SMBJ43CAHM3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43CAHM3_A/I.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SMBJ43CAHM3_A/I from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. 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), and clamps to ≤69.4 V at 8.6 A peak surge current - deployed in industrial sensor interfaces and automotive ECUs for ESD and load-dump protection.
For engineers reviewing the SMBJ43CAHM3_A/I datasheet, SMBJ43CAHM3_A/I pinout, SMBJ43CAHM3_A/I application, or SMBJ43CAHM3_A/I equivalent, this device is selected for robust bidirectional transient suppression where low clamping voltage, fast response (<1 ns), and AEC-Q101 qualification (via HM3 suffix) are required in space-constrained PCB layouts.
Technical Context
This TVS operates symmetrically in both directions due to its bidirectional construction, enabling protection of AC-coupled or floating signal paths without polarity concerns. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1.0 µA at VWM), while the 20 °C/W junction-to-lead thermal resistance supports reliable power dissipation under repetitive surge conditions.
The device complies with IEC 61000-4-2 (ESD), IEC 61000-4-4 (EFT), and ISO 7637-2 (automotive transients) when applied with appropriate layout practices. Its MSL Level 1 rating and 260 °C lead-free reflow compatibility confirm suitability for high-volume automated assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 43 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin for 36–42 V nominal systems. |
| VBR min/max | 47.8 V / 52.8 V at 1 mA - Tight 5 V window ensures predictable turn-on across temperature and production lot. |
| VC @ IPPM | ≤69.4 V at 8.6 A - Clamping voltage directly limits maximum stress on downstream ICs during 10/1000 µs surge events. |
| PPPM | 600 W - Sustains standardized lightning-induced surges per IEC 61000-4-5 with 0.01% duty cycle without degradation. |
| ID @ VWM | ≤1.0 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance sensor bias networks. |
| TJ max | +150 °C - Enables operation in under-hood automotive environments and industrial enclosures without derating. |
| Package | SMB (DO-214AA) - 4.57 mm × 3.94 mm footprint with 2.20 mm height; compatible with standard SMT pick-and-place and reflow profiles. |
Pinout & Package
Two-terminal bidirectional device in SMB (DO-214AA) package; no polarity marking. Terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102. Mounting requires 5.0 mm × 5.0 mm copper pads per terminal for rated power handling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; conducts surge current in either direction once VBR is exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC lines, differential buses (e.g., RS-485), or ungrounded sensors without external polarity management. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive applications including engine control, body electronics, and ADAS sensor modules per stress test requirements. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and JEDEC J-STD-203; supports green manufacturing and end-of-life recycling compliance. |
| 600 W peak pulse power | Handles ISO 7637-2 Pulse 1 (inductive switch-off) and Pulse 3b (ESD-like bursts) without failure in 12 V/24 V systems. |
| MSL Level 1, 260 °C peak | Eliminates moisture sensitivity concerns; allows direct placement into standard lead-free reflow ovens without baking. |
Applications
| Industrial Sensor Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting analog output lines (4–20 mA) and digital I/O (CAN/LIN) from ESD and relay-induced transients in factory automation PLCs. IC Role / Device Role: Primary transient shunt placed at connector entry point, clamping surges before reaching precision ADCs or microcontroller GPIOs. Use Value: Prevents latch-up and parametric shift in op-amps and MCU inputs by limiting voltage to ≤69.4 V during 1 kV ESD contact discharge. |
Use Scenario: Safeguarding LIN bus transceivers and door module microcontrollers against battery dump and jump-start surges. IC Role / Device Role: Bidirectional clamp on LIN signal line and VBAT-supply rail, absorbing ISO 7637-2 Pulse 5a (load dump) energy. Use Value: Maintains communication integrity during 35 V/100 ms load dump events by clamping VBAT to <70 V, avoiding transceiver shutdown. |
| Telecom Power Input | Consumer USB-C Port Protection |
Use Scenario: Guarding 48 V PoE-powered equipment inputs against lightning-induced surges on Ethernet cables. IC Role / Device Role: First-stage protector on primary DC input, coordinated with MOVs and gas discharge tubes for multi-level defense. Use Value: Limits let-through voltage to downstream DC-DC converters during 10/1000 µs 6 kV surges, preserving 50 V-rated input capacitors. |
Use Scenario: Suppressing ESD on USB-C CC and VBUS lines in portable speakers and docking stations. IC Role / Device Role: Low-capacitance (<100 pF) bidirectional TVS placed adjacent to connector, meeting IEC 61000-4-2 ±15 kV air/±8 kV contact. Use Value: Prevents data corruption and port disablement by clamping CC line transients to <12 V while adding <0.5 pF parasitic capacitance. |
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_A/I | Same electrical specs, but RoHS-compliant commercial grade (not halogen-free); lacks AEC-Q101 qualification. | Approved for industrial/commercial use only; not certified for automotive under-hood deployment. | Select when AEC-Q101 is not required and cost optimization is prioritized over halogen-free compliance. |
| SMAJ43CAHM3_A/I | Lower 400 W PPPM rating; same VWM/VBR/VC but reduced surge current handling (6.4 A vs. 8.6 A). | Suitable for lower-energy threat environments (e.g., consumer USB ports), not recommended for 24 V industrial fieldbus. | Choose for space-constrained designs where 3.5 mm × 2.7 mm SMA footprint is mandatory and surge energy is ≤400 W. |
Compared with SMBJ43CAHE3_A/I and SMAJ43CAHM3_A/I, the SMBJ43CAHM3_A/I uniquely combines AEC-Q101 qualification, halogen-free construction, and full 600 W surge capability in the SMB package - making it the only option among the three qualified for automotive body electronics with stringent material and reliability requirements.
Availability
SMBJ43CAHM3_A/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body control modules, telecom power inputs, and consumer USB-C port protection requiring stable component supply across extended production cycles.
Supply support for SMBJ43CAHM3_A/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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific performance.
The SMBJ series targets high-reliability transient suppression in automotive, industrial, and telecom infrastructure, engineered to meet stringent surge immunity standards while supporting automated manufacturing and long-term supply stability.
FAQ
What does the "CA" suffix indicate in SMBJ43CAHM3_A/I?
The "CA" suffix denotes a bidirectional configuration - meaning SMBJ43CAHM3_A/I provides symmetrical clamping in both forward and reverse directions. This enables protection of AC-coupled signals, differential buses like RS-485, or ungrounded sensor outputs without requiring polarity-aware layout. Unlike unidirectional variants (e.g., SMBJ43A), SMBJ43CAHM3_A/I has no cathode band marking and identical VBR characteristics in either polarity.
Is SMBJ43CAHM3_A/I qualified for automotive applications?
Yes, SMBJ43CAHM3_A/I is AEC-Q101 qualified, as confirmed by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified). It has passed stress tests including high-temperature operating life, temperature cycling, and ESD per AEC-Q101 Rev D. This makes SMBJ43CAHM3_A/I suitable for automotive body electronics, infotainment power rails, and ADAS sensor interfaces where reliability under thermal and electrical stress is critical.
What is the maximum clamping voltage of SMBJ43CAHM3_A/I and how is it measured?
The maximum clamping voltage (VC) of SMBJ43CAHM3_A/I is 69.4 V, measured at 8.6 A peak pulse current using a 10/1000 µs waveform per IEC 61000-4-5. This value represents the upper limit of voltage imposed on protected circuitry during a standardized surge event. The low VC ensures downstream components such as 75 V-rated DC-DC controllers or 60 V logic interfaces remain within safe operating limits during transient exposure.
How does the SMBJ43CAHM3_A/I package compare to SMAJ and SMCJ families?
SMBJ43CAHM3_A/I uses the SMB (DO-214AA) package - 4.57 mm × 3.94 mm with 2.20 mm height - offering higher power handling than SMAJ (400 W) and smaller footprint than SMCJ (600 W, DO-214AB). Compared to SMAJ43CAHM3_A/I, SMBJ43CAHM3_A/I delivers 50% more surge current (8.6 A vs. 6.4 A) in only 15% larger area. Against SMCJ43CAHM3_A/I, it trades 1.5× board area for identical 600 W rating and easier placement in dense layouts.
Can SMBJ43CAHM3_A/I be used in place of a unidirectional TVS like SMBJ43AHM3_A/I?
No - SMBJ43CAHM3_A/I is not a drop-in replacement for unidirectional variants. While both share VWM (43 V) and PPPM (600 W), SMBJ43CAHM3_A/I conducts in both directions and lacks polarity marking, whereas SMBJ43AHM3_A/I has a cathode band and blocks current in reverse bias until breakdown. Substituting SMBJ43CAHM3_A/I in a unidirectional design may cause unintended conduction on DC-biased lines, leading to system malfunction or increased leakage. Always verify circuit topology before interchange.
SMBJ43CAHM3_A/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:
- Obsolete
- 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_A/I FAQ
1.How can I place an order for SMBJ43CAHM3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43CAHM3_A/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_A/I reliable?
The price and inventory of SMBJ43CAHM3_A/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_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ43CAHM3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43CAHM3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43CAHM3_A/I?
SMBJ43CAHM3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43CAHM3_A/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_A/I?
For technical support, including SMBJ43CAHM3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43CAHM3_A/I requirements.
6.How does Aetrix verify that SMBJ43CAHM3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ43CAHM3_A/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_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ43CAHM3_A/I?
All SMBJ43CAHM3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43CAHM3_A/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_A/I part is unused and in its original packaging.
Return procedure for SMBJ43CAHM3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43CAHM3_A/I Tags
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DESD3V3E1BL-7B
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Diodes Incorporated
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Diodes Incorporated
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Diodes Incorporated
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