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Vishay General Semiconductor - Diodes Division SMBJ78CAHM3/H
- Part No.:
- SMBJ78CAHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHM3/H.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,044
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Product details
Overview
SMBJ78CAHM3/H from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V stand-off voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 µs), clamping voltage of 126 V at 4.8 A, and operates across –55 °C to +150 °C junction temperature.
For engineers reviewing the SMBJ78CAHM3/H datasheet, SMBJ78CAHM3/H pinout, SMBJ78CAHM3/H application, or SMBJ78CAHM3/H equivalent, this device is selected for high-energy transient suppression on DC power rails, bidirectional signal lines, and automotive body electronics where halogen-free, RoHS-compliant, and AEC-Q101-qualified components are required.
Technical Context
This bidirectional TVS diode functions as a voltage-clamping protector with symmetrical avalanche behavior in both polarities, enabling use without polarity concern on AC-coupled or floating nodes. Its low incremental surge resistance and fast response time (<1 ns) ensure effective suppression of ESD, lightning-induced surges, and inductive switching transients.
The SMBJ78CAHM3/H is rated for 600 W peak pulse power under standardized 10/1000 µs waveform conditions, with thermal resistance of 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), supporting reliable operation under repetitive surge events when mounted per recommended 0.2" × 0.2" copper pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC RMS working range. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Breakdown threshold range; ensures consistent avalanche initiation across production lot. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage during full-rated 600 W surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling (10/1000 µs); quantifies single-event surge energy absorption capability. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.220" × 0.155" footprint; supports automated placement and meets UL 94 V-0. |
| Qualification | AEC-Q101 qualified - Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking; terminals are matte tin-plated, solderable per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative polarity) | One terminal of symmetrical PN junction; conducts during negative transients relative to cathode reference. |
| Cathode | Transient current entry (positive polarity) | Other terminal of symmetrical PN junction; conducts during positive transients; no band marking for bidirectional types. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection on AC, differential, or floating signal/power lines without polarity constraints. |
| 600 W peak pulse rating | Handles high-energy transients such as ISO 7637-2 Pulse 1/2a/5a and IEC 61000-4-5 Level 3 surges. |
| AEC-Q101 qualification | Validated for automotive applications including engine control units, body control modules, and infotainment systems. |
| Halogen-free & RoHS-compliant | Meets environmental compliance requirements for EU, China RoHS, and automotive OEM sustainability mandates. |
| MSL Level 1 (260 °C) | Supports lead-free reflow soldering without moisture sensitivity concerns or baking requirements. |
Applications
| Automotive Body Electronics | Industrial Sensor Interfaces |
|---|---|
Use Scenario: Protection of LIN bus lines and door module power inputs against load dump and battery reversal transients. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed directly at connector entry point to limit transient voltage to <126 V. Use Value: Prevents damage to LIN transceivers and microcontrollers by clamping ISO 7637-2 Pulse 5a (75 V/300 ms) within safe limits. | Use Scenario: Guarding 4–20 mA current loop inputs in PLC analog input modules from field wiring surges. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing induced transients before they reach precision op-amps and ADC front-ends. Use Value: Maintains signal integrity by limiting transient overshoot to ≤126 V while preserving loop accuracy via low leakage (<1 µA at 78 V). |
| Telecom Power Feeds | Consumer Appliance Motor Controls |
Use Scenario: Overvoltage protection on -48 V DC telecom power distribution boards exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Primary clamping device on feed lines upstream of DC/DC converters and PMICs. Use Value: Absorbs up to 600 W of surge energy (10/1000 µs) without degradation, ensuring uninterrupted system uptime. | Use Scenario: Suppressing inductive kickback from brushed DC motor drivers in washing machines and HVAC blowers. IC Role / Device Role / Timing Role: Snubber-style TVS across motor terminals to clamp flyback spikes during MOSFET turn-off. Use Value: Extends MOSFET lifetime by limiting drain-source voltage to 126 V, well below 200 V rating of common logic-level FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHE3/H | Same electrical specs; RoHS-compliant but not halogen-free; lacks AEC-Q101 qualification. | Suitable for commercial/industrial designs where automotive qualification is not required. | Select when halogen content or automotive qualification is not mandated and cost optimization is prioritized. |
| SMCJ78CAHM3 | Same VWM/VBR/VC, but SMC (DO-214AB) package - larger footprint (0.285" × 0.235"), higher PPPM (1500 W). | Used where higher surge margin or legacy board space allows larger package. | Choose when 1500 W surge rating is needed and PCB real estate permits SMC outline. |
Compared with SMBJ78CAHE3/H and SMCJ78CAHM3, the SMBJ78CAHM3/H uniquely combines AEC-Q101 qualification, halogen-free construction, and SMB footprint-making it optimal for space-constrained automotive modules requiring full compliance without derating.
Availability
SMBJ78CAHM3/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor interfaces, telecom power feeds, and consumer appliance motor controls requiring stable component supply and full regulatory compliance.
Supply support for SMBJ78CAHM3/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, TVS devices, and optoelectronics with emphasis on reliability, efficiency, and application-specific performance.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments-including automotive, industrial, and telecom-balancing compact size, high surge capacity, and stringent qualification standards.
FAQ
What is the clamping voltage of SMBJ78CAHM3/H and how is it measured?
The SMBJ78CAHM3/H has a maximum clamping voltage (VC) of 126 V, measured at its peak pulse current (IPPM) of 4.8 A under the standardized 10/1000 µs double-exponential surge waveform. This value is guaranteed per Vishay's datasheet (Document Number 88392, Rev. 09-Jan-2024) and reflects worst-case voltage seen by downstream circuitry during full-rated transient events. The SMBJ78CAHM3/H maintains this clamping performance across its operational temperature range.
Is SMBJ78CAHM3/H suitable for automotive applications?
Yes, SMBJ78CAHM3/H is AEC-Q101 qualified and specifically designated for automotive use, as indicated by the "HM3" suffix (halogen-free, RoHS-compliant, AEC-Q101 qualified) and "H" packaging code. It is validated for temperature cycling, highly accelerated life testing, and ESD robustness per automotive reliability standards, making it appropriate for body control modules, lighting systems, and infotainment power rails where SMBJ78CAHM3/H must withstand under-hood thermal stress and electrical transients.
How does the bidirectional design of SMBJ78CAHM3/H affect its circuit placement?
The bidirectional design of SMBJ78CAHM3/H eliminates polarity sensitivity, allowing placement across AC-coupled signals, differential buses (e.g., LIN, RS-485), or ungrounded power domains without orientation constraints. Unlike unidirectional TVS diodes, SMBJ78CAHM3/H has no cathode band marking and conducts symmetrically in both directions-simplifying layout, reducing BOM variants, and improving design reuse across dual-polarity protection points.
What is the maximum operating temperature for SMBJ78CAHM3/H?
The SMBJ78CAHM3/H has a specified junction temperature range of –55 °C to +150 °C, with thermal resistance values of RθJA = 100 °C/W and RθJL = 20 °C/W. This enables reliable operation in under-hood automotive environments and industrial enclosures where ambient temperatures exceed 105 °C, provided PCB copper pad layout follows Vishay's recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) per terminal. Derating applies above TA = 25 °C per Figure 2 in the SMBJ78CAHM3/H datasheet.
Does SMBJ78CAHM3/H meet lead-free soldering requirements?
Yes, SMBJ78CAHM3/H is rated for lead-free reflow soldering with MSL Level 1 per J-STD-020 and a maximum peak temperature of 260 °C. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 solderability standards, and whisker resistance meets JESD 201 Class 2. No pre-baking is required prior to assembly, and the SMBJ78CAHM3/H maintains mechanical and electrical integrity through standard Pb-free reflow profiles.
SMBJ78CAHM3/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:
- Discontinued at Digi-Key
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- 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)
SMBJ78CAHM3/H FAQ
1.How can I place an order for SMBJ78CAHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHM3/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 SMBJ78CAHM3/H reliable?
The price and inventory of SMBJ78CAHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CAHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHM3/H?
SMBJ78CAHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHM3/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 SMBJ78CAHM3/H?
For technical support, including SMBJ78CAHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHM3/H requirements.
6.How does Aetrix verify that SMBJ78CAHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHM3/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 SMBJ78CAHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHM3/H?
All SMBJ78CAHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHM3/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 SMBJ78CAHM3/H part is unused and in its original packaging.
Return procedure for SMBJ78CAHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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