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Vishay General Semiconductor - Diodes Division SMBJ43AHM3_A/H
- Part No.:
- SMBJ43AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ43AHM3_A/H.pdf
- Description:
- TVS DIODE 43VWM 69.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,073
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Product details
Overview
SMBJ43AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. It features a 43 V stand-off voltage (VWM), 47.8–52.8 V breakdown voltage (VBR) at 1 mA, 69.4 V maximum clamping voltage (VC) at 8.6 A peak pulse current (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform.
For engineers reviewing the SMBJ43AHM3_A/H datasheet, SMBJ43AHM3_A/H pinout, SMBJ43AHM3_A/H application, or SMBJ43AHM3_A/H equivalent, this device is selected for robust overvoltage protection on DC power rails and signal lines in industrial control systems, automotive ECUs, and telecom interface circuits where fast response (<1 ns), low clamping ratio, and AEC-Q101 qualification are required.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-banded polarity, leveraging a glass-passivated silicon junction for stable avalanche behavior under repetitive surge conditions. Its thermal resistance (RθJA = 100 °C/W) and junction temperature range (–55 °C to +150 °C) support operation in high-ambient environments when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ43AHM3_A/H delivers 600 W peak pulse power handling per 10/1000 µs waveform at TA = 25 °C, with derating above 25 °C per Figure 2. Its 0.01 % duty cycle rating enables reliable protection against infrequent but high-energy transients without thermal runaway, while its <1 ns response time ensures protection of downstream MOSFETs and ICs before damage occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 43 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 47.8–52.8 V at 1 mA - Avalanche onset range; ensures predictable turn-on during overvoltage events. |
| VC (Clamping Voltage) | 69.4 V at IPPM = 8.6 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines stress on downstream components. |
| PPPM (Peak Pulse Power) | 600 W - Energy-handling capability under standardized 10/1000 µs transient; validates suitability for IEC 61000-4-5 Level 3/4 surges. |
| ID (Reverse Leakage) | 1.0 µA max at VWM - Minimal standby current; preserves efficiency in battery-powered or low-power sensor nodes. |
| TJ max | +150 °C - Enables use in under-hood automotive or industrial enclosures without derating concerns. |
| Package | SMB (DO-214AA) - Industry-standard surface-mount outline with 5.21 mm × 4.57 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (260 °C peak reflow), RoHS-compliant and halogen-free (HM3 suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms current path during reverse-biased clamping event. |
| Cathode | High-side connection point (marked with band) | Connected to protected line (e.g., 43 V rail); conducts avalanche current when Vline exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Validates compliance with IEC 61000-4-5 surge immunity requirements for industrial and automotive applications. |
| Clamping voltage ≤ 69.4 V at 8.6 A | Ensures protected 43 V logic or power circuits remain below absolute maximum ratings during worst-case transients. |
| AEC-Q101 qualified (HM3 suffix) | Confirms reliability for automotive under-hood use, including temperature cycling, humidity, and mechanical shock testing. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (<1 ns response), critical for protecting modern low-voltage ICs. |
| MSL Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow soldering, reducing manufacturing cost and process complexity. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
Use Scenario: Protection of 48 V DC bus and gate driver signal lines against inductive kickback from brushed DC motors and solenoids. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between power rail and ground, activated within nanoseconds of overvoltage event. Use Value: Prevents latch-up or permanent damage to microcontrollers and half-bridge drivers during motor commutation transients up to 600 W. |
Use Scenario: Surge suppression on LIN bus lines and 12 V supply inputs in door modules, seat controllers, and lighting ECUs. IC Role / Device Role / Timing Role: Standby protection element with <1 µA leakage, clamping ESD and load-dump events without affecting normal communication. Use Value: Maintains system uptime by absorbing ISO 7637-2 Pulse 1/2/5a surges while meeting AEC-Q101 qualification for automotive deployment. |
| Telecom Power Interfaces | Consumer Appliance Control Boards |
Use Scenario: Input protection for AC/DC adapters and PoE-powered devices subjected to lightning-induced surges on primary-side DC rails. IC Role / Device Role / Timing Role: Primary-stage TVS on 43 V intermediate bus, coordinated with upstream MOVs and downstream filtering. Use Value: Limits let-through voltage to <69.4 V during 10/1000 µs surges, enabling use of lower-rated input capacitors and regulators. |
Use Scenario: Overvoltage safeguard for microcontroller I/O pins and relay coil drivers in washing machines, HVAC controls, and smart home hubs. IC Role / Device Role / Timing Role: Point-of-load clamping device on 5–48 V internal rails, activated only during fault conditions. Use Value: Reduces field failure rate by preventing transient-induced resets or flash corruption in cost-sensitive white-goods applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ43AHE3_A/H | RoHS-compliant commercial-grade variant (E3 suffix); lacks AEC-Q101 qualification and halogen-free certification. | Suitable for non-automotive industrial or consumer designs where automotive reliability standards are not mandated. | Select when cost sensitivity outweighs need for automotive qualification and halogen-free materials. |
| SMBJ43CAHM3_A/H | Bidirectional version (CA suffix); symmetrical VBR (47.8–52.8 V) in both directions; same clamping and power ratings. | Required for AC-coupled or floating signal lines (e.g., RS-485, CAN) where polarity reversal or differential surges occur. | Choose when protecting bidirectional interfaces or ungrounded circuits where unidirectional polarity marking is impractical. |
Compared with SMBJ43AHM3_A/H, the E3 variant trades automotive qualification for lower cost in commercial applications, while the CAHM3 variant adds bidirectional symmetry at no penalty to clamping performance-enabling reuse across AC and DC protection topologies without redesign.
Availability
SMBJ43AHM3_A/H is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ43AHM3_A/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and automotive-grade validation.
The SMBJ series is engineered for high-energy transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where robustness, fast response, and AEC-Q101 compliance are mandatory design requirements.
FAQ
What is the clamping voltage of SMBJ43AHM3_A/H at its rated peak pulse current?
The SMBJ43AHM3_A/H has a maximum clamping voltage (VC) of 69.4 V at its rated peak pulse current (IPPM) of 8.6 A under a 10/1000 µs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ43AHM3_A/H maintains this clamping performance across its specified operating temperature range, ensuring consistent protection behavior in real-world deployments.
Is SMBJ43AHM3_A/H qualified for automotive applications?
Yes, SMBJ43AHM3_A/H is AEC-Q101 qualified, as confirmed by the HM3 suffix and documentation in Vishay's datasheet (Document Number: 88392, Revision: 09-Jan-2024). This qualification covers stress tests including temperature cycling, humidity bias, mechanical shock, and high-temperature operating life-validating its use in automotive body electronics, infotainment, and powertrain subsystems. The SMBJ43AHM3_A/H meets these requirements without derating in ambient temperatures up to +125 °C.
How does the SMBJ43AHM3_A/H differ from the SMBJ43AHE3_A/H variant?
The SMBJ43AHM3_A/H differs from SMBJ43AHE3_A/H primarily in material composition and qualification: HM3 denotes halogen-free, RoHS-compliant, and AEC-Q101-qualified construction, whereas E3 indicates RoHS-compliant commercial grade only. Both share identical electrical specs (VWM = 43 V, VC = 69.4 V), but SMBJ43AHM3_A/H supports automotive production and environmentally regulated markets where halogen-free content and extended reliability validation are mandatory.
What is the thermal resistance of SMBJ43AHM3_A/H, and how does it affect PCB layout?
The SMBJ43AHM3_A/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 board material and dictates that PCB layout must provide adequate copper area to dissipate 5.0 W continuous power without exceeding TJmax = +150 °C. For high-reliability designs, increasing pad size or adding thermal vias improves heat transfer and extends surge endurance under repetitive stress.
Can SMBJ43AHM3_A/H be used for bidirectional signal line protection?
No, SMBJ43AHM3_A/H is a unidirectional TVS diode, identified by its cathode band marking and specified breakdown behavior only in reverse bias. For bidirectional signal lines such as RS-485, CAN, or USB, the SMBJ43CAHM3_A/H variant must be used instead-it provides symmetrical clamping in both polarities with identical VBR and VC ratings. Using SMBJ43AHM3_A/H on bidirectional lines risks forward conduction during negative transients and inadequate protection.
SMBJ43AHM3_A/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:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ43AHM3_A/H FAQ
1.How can I place an order for SMBJ43AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ43AHM3_A/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 SMBJ43AHM3_A/H reliable?
The price and inventory of SMBJ43AHM3_A/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ43AHM3_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ43AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ43AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ43AHM3_A/H?
SMBJ43AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ43AHM3_A/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 SMBJ43AHM3_A/H?
For technical support, including SMBJ43AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ43AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ43AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ43AHM3_A/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 SMBJ43AHM3_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ43AHM3_A/H?
All SMBJ43AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ43AHM3_A/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 SMBJ43AHM3_A/H part is unused and in its original packaging.
Return procedure for SMBJ43AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ43AHM3_A/H Tags
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