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Vishay General Semiconductor - Diodes Division SMBJ78CD-M3/I
- Part No.:
- SMBJ78CD-M3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CD-M3/I.pdf
- Description:
- TVS DIODE 78VWM 124VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,184
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Product details
Overview
SMBJ78CD-M3/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 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/I datasheet, SMBJ78CD-M3/I pinout, SMBJ78CD-M3/I application, or SMBJ78CD-M3/I equivalent, key selection criteria include bidirectional clamping capability, ±3.5 % VBR tolerance, low leakage (<0.5 μA at VWM), M3-grade halogen-free RoHS compliance, and compatibility with automated SMT placement on standard PCB pad layouts.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche breakdown in both polarities, enabling suppression of positive and negative transients without polarity sensitivity. Its low incremental surge resistance and fast response time ensure effective energy diversion during ESD or lightning-induced surges.
The SMBJ78CD-M3/I is rated for 150 °C maximum junction temperature, derated linearly above 25 °C ambient, and meets J-STD-020 MSL Level 1 with 260 °C reflow peak. Thermal resistance is 125 °C/W (junction-to-ambient, minimum pad layout) and 20 °C/W (junction-to-mount).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC/AC working range. |
| 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 - Clamped voltage under 10/1000 μs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 level 4 surge immunity. |
| 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 industrial environments with elevated ambient temperatures. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 3.94 mm footprint and 2.20 mm height. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no cathode band; symmetrical terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (Terminals 1 & 2) | Bidirectional avalanche junction | Identical terminals; either may serve as input or return path - enables placement flexibility on AC or differential lines. |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Ensures consistent clamping threshold across batches - critical for meeting tight system-level surge margin requirements. |
| 600 W peak pulse power (10/1000 μs) | Supports robust protection against IEC 61000-4-5 combination wave surges up to 4 kV (line-earth) without degradation. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free reflow assembly without moisture-related delamination or popcorn failure. |
| M3 suffix qualification | Halogens-free, RoHS-compliant, and passes JESD 201 Class 2 whisker test - suitable for long-life industrial deployments. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients (e.g., ESD), improving protection effectiveness for sensitive IC inputs. |
Applications
| Industrial Sensor Signal Lines | Telecom Data Line Protection |
|---|---|
Use Scenario: Protecting analog output (4–20 mA) and digital interface (RS-485) lines in factory-floor sensors exposed to motor switching noise and ground bounce. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across differential pair or between signal and ground to limit transient excursions. Use Value: Prevents latch-up or damage to downstream ADCs, isolators, or UART transceivers during repetitive 600 W surge events. |
Use Scenario: Shielding Ethernet PHY interfaces and DSL line drivers from induced surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary front-end TVS on twisted-pair data lines, positioned before common-mode chokes and receiver ICs. Use Value: Maintains signal integrity by clamping transients to ≤124 V while adding <0.5 pF capacitance - no data rate degradation. |
| Power Supply Input Rails | Automotive Body Control Modules |
Use Scenario: Secondary overvoltage protection on 24 V DC input rails of programmable logic controllers (PLCs) subjected to load dump and inductive kickback. IC Role / Device Role / Timing Role: Parallel-connected clamping device across bulk input capacitor to absorb short-duration energy spikes. Use Value: Complements primary protection (e.g., fuse + MOV) with precise 78 V hold-off and fast sub-nanosecond response. |
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins in non-safety-critical body electronics (e.g., door modules, seat controls). IC Role / Device Role / Timing Role: Localized TVS on each LIN node to suppress ISO 7637-2 pulse 1, 2a, and 5a transients. Use Value: Survives repeated 100 A/10 ms pulses at 12 V systems while maintaining <0.5 μA leakage for battery-sensitive sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ78CA | Same VWM (78 V), same SMB package, but ±5 % VBR tolerance (vs. ±3.5 % for SMBJ78CD-M3/I); 500 W PPPM rating. | Lower peak power and wider VBR spread reduce margin in high-reliability industrial surge testing. | Select SMBJ78CD-M3/I when tighter clamping consistency and full 600 W rating are required for IEC 61000-4-5 compliance. |
| ON Semiconductor SMCJ78CA | Higher package thermal resistance (RθJA = 140 °C/W vs. 125 °C/W), same VWM/VBR specs, 600 W rating, but M3 not guaranteed. | Reduced thermal headroom limits sustained surge repetition rate in high-temperature enclosures. | Prefer SMBJ78CD-M3/I for designs requiring verified M3 process control and superior thermal performance on minimal pad layouts. |
Compared with SMAJ78CA and SMCJ78CA, the SMBJ78CD-M3/I delivers tighter VBR tolerance, lower thermal resistance, and documented M3 qualification - making it optimal for space-constrained, high-surge-repetition industrial and telecom applications where long-term reliability is prioritized over lowest unit cost.
Availability
SMBJ78CD-M3/I is available at Aetrix Electronics and suitable for industrial sensor interfaces, telecom line protection, and automotive body control modules requiring stable component supply, long-lifecycle support, and traceable halogen-free sourcing.
Supply support for SMBJ78CD-M3/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 high-reliability diodes, MOSFETs, optoelectronics, and passive components for demanding industrial and automotive applications.
The SMBJ series is engineered specifically for robust transient suppression in harsh electromagnetic environments - emphasizing precision clamping, repeatable surge endurance, and seamless SMT manufacturability.
FAQ
What is the clamping voltage of SMBJ78CD-M3/I at its rated peak pulse current?
The SMBJ78CD-M3/I clamps to a maximum of 124 V when subjected to its peak pulse current of 4.86 A under the standard 10/1000 μs waveform. This value is measured and guaranteed per Vishay's datasheet (Document Number: 87606), ensuring predictable overvoltage limiting for protected circuits. The SMBJ78CD-M3/I achieves this with low incremental resistance, minimizing overshoot during fast transients.
Is SMBJ78CD-M3/I unidirectional or bidirectional, and how does that affect PCB layout?
SMBJ78CD-M3/I is a bidirectional TVS diode - indicated by the "CD" suffix - meaning it provides symmetrical clamping for both positive and negative transients without polarity orientation constraints. There is no cathode band on the SMB package, allowing unrestricted placement on AC-coupled or differential signal lines. This simplifies layout and eliminates orientation errors during automated assembly of the SMBJ78CD-M3/I.
What does the "M3" suffix signify for SMBJ78CD-M3/I?
For SMBJ78CD-M3/I, the "M3" suffix denotes halogen-free construction, RoHS compliance, industrial-grade reliability, and successful qualification to JESD 201 Class 2 for tin whisker resistance. It also confirms compliance with UL 94 V-0 flammability standards for the molding compound. These attributes make the SMBJ78CD-M3/I suitable for long-life, safety-conscious industrial and telecom equipment where material purity and intermetallic growth are critical concerns.
Can SMBJ78CD-M3/I be used in place of a unidirectional SMBJ78D-M3/I?
No - SMBJ78CD-M3/I is bidirectional and lacks polarity marking, whereas SMBJ78D-M3/I is unidirectional with a cathode band and asymmetric conduction behavior. Substituting SMBJ78CD-M3/I for SMBJ78D-M3/I in DC-biased circuits may allow unintended reverse conduction or fail to suppress certain transient polarities effectively. Always verify circuit topology and transient directionality before selecting the SMBJ78CD-M3/I.
What is the maximum operating temperature for SMBJ78CD-M3/I, and how does derating work?
The SMBJ78CD-M3/I has a maximum junction temperature (TJ max) of 150 °C. Power dissipation must be derated linearly above 25 °C ambient: at 50 °C ambient, PD drops to 5.0 W (on infinite heatsink) or 1.0 W (on minimum recommended pad). Derating curves are provided in Figure 2 of the Vishay datasheet (87606), and thermal design must account for RθJA = 125 °C/W under standard PCB conditions to avoid exceeding TJ max in the SMBJ78CD-M3/I.
SMBJ78CD-M3/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:
- 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/I FAQ
1.How can I place an order for SMBJ78CD-M3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CD-M3/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 SMBJ78CD-M3/I reliable?
The price and inventory of SMBJ78CD-M3/I 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/I is usually 5 days.
3.What payment methods are accepted for SMBJ78CD-M3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CD-M3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CD-M3/I?
SMBJ78CD-M3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CD-M3/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 SMBJ78CD-M3/I?
For technical support, including SMBJ78CD-M3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CD-M3/I requirements.
6.How does Aetrix verify that SMBJ78CD-M3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78CD-M3/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 SMBJ78CD-M3/I meets industry standards.
7.What is the process for return or replacement of SMBJ78CD-M3/I?
All SMBJ78CD-M3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CD-M3/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 SMBJ78CD-M3/I part is unused and in its original packaging.
Return procedure for SMBJ78CD-M3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CD-M3/I Tags
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Diodes Incorporated
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Toshiba Semiconductor and Storage
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Diodes Incorporated
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