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Vishay General Semiconductor - Diodes Division SMBJ78CD-M3/H
- Part No.:
- SMBJ78CD-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CD-M3/H.pdf
- Description:
- TVS DIODE 78VWM 124VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,777
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Product details
Overview
SMBJ78CD-M3/H 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 signal or power lines. It features a 78 V stand-off voltage (VWM), 88.1–94.4 V breakdown voltage (VBR) at 1 mA, 600 W peak pulse power (10/1000 μs), and clamps to ≤124 V at 4.86 A peak surge current - deployed in industrial sensor interfaces and telecom line protection.
For engineers reviewing the SMBJ78CD-M3/H datasheet, SMBJ78CD-M3/H pinout, SMBJ78CD-M3/H application, or SMBJ78CD-M3/H equivalent, this page delivers verified electrical specs, bidirectional clamping behavior, thermal derating curves, M3 halogen-free RoHS-compliant construction, and direct alternatives for overvoltage protection design validation.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR min/max (88.1–94.4 V), VWM (78 V), and VC (≤124 V at IPPM) in either direction. Its low incremental surge resistance and fast response time enable effective suppression of ESD, lightning-induced surges, and inductive switching transients without polarity sensitivity.
Thermal performance is defined by RθJA = 125 °C/W (on minimum pad) and RθJM = 20 °C/W, supporting operation from –55 °C to +150 °C junction temperature. The device meets MSL Level 1 per J-STD-020 and passes JESD 201 Class 2 whisker testing, confirming robustness for automated SMT assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse stand-off voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 88.1 V / 94.4 V at 1 mA - tight ±3.5 % tolerance ensures predictable turn-on across production lots |
| VC @ IPPM | ≤124 V at 4.86 A - clamping voltage under 10/1000 μs surge, limiting downstream IC stress during transient events |
| PPPM | 600 W - peak pulse power handling capability with 0.01 % duty cycle, validated per ANSI/IEEE C62.35 |
| ID @ VWM | ≤0.5 μA - ultra-low reverse leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - enables reliable operation in high-temperature industrial and telecom environments |
| Package | SMB (DO-214AA) - standardized surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no cathode band; terminals are matte tin-plated for solderability per J-STD-002 and JESD 22-B102.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional transient conduction path | No polarity marking; either terminal serves as anode or cathode depending on instantaneous voltage polarity |
| Cathode Band (absent) | Visual polarity indicator | Omitted per bidirectional design - eliminates risk of incorrect orientation during placement |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise, repeatable clamping thresholds across manufacturing batches for consistent system-level surge immunity |
| 600 W peak pulse power (10/1000 μs) | Handles high-energy transients from inductive load switching or lightning surges without degradation |
| MSL Level 1, 260 °C reflow compatible | Supports lead-free reflow soldering without preconditioning, reducing manufacturing complexity |
| M3 suffix: halogen-free, RoHS, Class 2 whisker tested | Meets industrial environmental compliance and long-term reliability requirements for harsh deployments |
| Low ID (≤0.5 μA at VWM) | Minimizes loading on high-impedance sensor or communication lines, preserving signal fidelity |
Applications
| Industrial Sensor Interface Protection | Telecom Line Surge Suppression |
|---|---|
|
Use Scenario: Protecting 4–20 mA current loop sensors and analog voltage inputs in PLC I/O modules from field-induced surges. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across differential signal pair or between signal and ground. Use Value: Limits transient voltage to ≤124 V while maintaining <0.5 μA leakage, preventing ADC saturation or op-amp latch-up. |
Use Scenario: Shielding RS-485/RS-232 data lines in base station backhaul equipment from lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary front-end TVS on twisted-pair interface, mounted before line driver/receiver ICs. Use Value: Absorbs 600 W pulses without failure, preserving signal integrity and enabling compliance with IEC 61000-4-5 Level 4. |
| Automotive Body Control Module (BCM) Power Input | Consumer Appliance Motor Drive Protection |
|
Use Scenario: Safeguarding 12 V supply rails in BCMs against load dump and ISO 7637-2 pulse 5a/b transients. IC Role / Device Role / Timing Role: Parallel-connected TVS across input capacitor, clamping voltage spikes before DC-DC regulators. Use Value: Withstands 150 °C junction temperature and delivers stable clamping up to 124 V, meeting automotive thermal constraints. |
Use Scenario: Protecting microcontroller GPIOs and gate drivers in washing machine motor control boards from brush-commutator noise. IC Role / Device Role / Timing Role: Localized TVS on low-voltage control signals adjacent to triac or MOSFET switching nodes. Use Value: Fast response and low clamping voltage prevent false triggering or latch-up in sensitive logic circuits during commutation events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-E3/52 (Vishay) | Same VWM/VBR/VC specs; differs in packaging (tape-and-reel vs. bulk) and M3 compliance (E3/52 lacks M3 whisker test and halogen-free certification) | Acceptable where industrial-grade whisker resistance and RoHS/halogen-free compliance are not mandated | Select SMBJ78CD-M3/H when full M3 qualification and traceable sourcing for industrial OEMs are required. |
| SMCJ78CA (Littelfuse) | Higher package (SMC/DO-214AB); same 78 V VWM but higher PPPM (1500 W); larger footprint (7.11 mm × 6.22 mm) | Used where higher surge energy absorption is needed, but requires PCB layout revision due to larger size | Choose SMBJ78CD-M3/H for space-constrained designs needing SMB footprint and certified M3 reliability. |
Compared with SMBJ78CA-E3/52, SMBJ78CD-M3/H adds M3 whisker resistance and halogen-free compliance without altering electrical performance; versus SMCJ78CA, it trades 900 W lower peak power for 30 % smaller PCB area and drop-in compatibility with existing SMB layouts.
Availability
SMBJ78CD-M3/H is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, long-term lifecycle support, and M3-compliant materials.
Supply support for SMBJ78CD-M3/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, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series targets high-reliability transient suppression in space-constrained, high-surge environments - engineered for industrial automation, telecom infrastructure, and automotive electronics where consistent clamping and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ78CD-M3/H at its rated peak pulse current?
The SMBJ78CD-M3/H clamps to a maximum of 124 V at its peak pulse current (IPPM) of 4.86 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream circuitry. The SMBJ78CD-M3/H maintains this clamping performance across its full operating temperature range of –55 °C to +150 °C.
Is SMBJ78CD-M3/H unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ78CD-M3/H is a bidirectional TVS diode, meaning it suppresses transients of either polarity without requiring orientation during placement. Unlike unidirectional variants (e.g., SMBJ78D), it has no cathode band - simplifying pick-and-place and eliminating polarity-related assembly errors. This makes the SMBJ78CD-M3/H ideal for differential signal lines or AC-coupled interfaces where voltage polarity reverses.
What does the "M3" suffix signify in SMBJ78CD-M3/H?
"M3" denotes Vishay's industrial-grade qualification: halogen-free molding compound, RoHS compliance, and passing JESD 201 Class 2 whisker testing. It also confirms compliance with UL 94 V-0 flammability rating and matte tin-plated leads solderable per J-STD-002. These attributes make SMBJ78CD-M3/H suitable for high-reliability industrial and telecom applications where long-term interconnect integrity is mandatory.
Can SMBJ78CD-M3/H replace SMBJ78D in an existing design?
No - SMBJ78CD-M3/H is bidirectional while SMBJ78D is unidirectional, so direct replacement requires verifying circuit topology. If the original design relies on polarity-sensitive clamping (e.g., DC-biased rail protection), substituting SMBJ78CD-M3/H may allow reverse-polarity conduction and unintended current paths. Always validate transient behavior and leakage under both polarities before substitution. The SMBJ78CD-M3/H must be used only where symmetrical protection is intended.
What is the thermal resistance and power derating behavior of SMBJ78CD-M3/H?
SMBJ78CD-M3/H has a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W on minimum recommended pad layout and 100 °C/W on 5.0 mm × 5.0 mm copper pads. Its steady-state power dissipation drops linearly above 25 °C ambient, reaching zero at 150 °C. Derating curves in the Vishay datasheet (Fig. 5) confirm usable power of ~0.5 W at 100 °C ambient - critical for thermal design in enclosed industrial enclosures. This behavior is intrinsic to the SMBJ78CD-M3/H package and layout dependency.
SMBJ78CD-M3/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:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 88.1V
- Voltage - Clamping (Max) @ Ipp:
- 124V
- Current - Peak Pulse (10/1000µs):
- 4.86A
- 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)
SMBJ78CD-M3/H FAQ
1.How can I place an order for SMBJ78CD-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CD-M3/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 SMBJ78CD-M3/H reliable?
The price and inventory of SMBJ78CD-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CD-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ78CD-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CD-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CD-M3/H?
SMBJ78CD-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CD-M3/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 SMBJ78CD-M3/H?
For technical support, including SMBJ78CD-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CD-M3/H requirements.
6.How does Aetrix verify that SMBJ78CD-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ78CD-M3/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 SMBJ78CD-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ78CD-M3/H?
All SMBJ78CD-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CD-M3/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 SMBJ78CD-M3/H part is unused and in its original packaging.
Return procedure for SMBJ78CD-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CD-M3/H Tags
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