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Vishay General Semiconductor - Diodes Division SMBG78CAHE3/52
- Part No.:
- SMBG78CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78CAHE3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,133
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Product details
Overview
SMBG78CAHE3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for clamping voltage transients on signal or power lines. 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), <1.0 μA reverse leakage at VWM, and clamps to ≤126 V at 4.8 A peak pulse current - deployed in automotive sensor protection and industrial I/O interfaces.
For engineers reviewing the SMBG78CAHE3/52 datasheet, SMBG78CAHE3/52 pinout, SMBG78CAHE3/52 application, or SMBG78CAHE3/52 equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 150 °C max junction temperature, low incremental surge resistance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This device operates as a silicon avalanche diode optimized for fast-response transient suppression in both polarities. Its glass-passivated junction ensures stable breakdown characteristics and low capacitance (<100 pF at 0 V, typical), while the SMBG package provides MSL Level 1 moisture sensitivity and 260 °C lead-free reflow compatibility.
The SMBG78CAHE3/52 delivers symmetrical clamping behavior with identical VBR min/max in either direction, supports repetitive 0.01% duty-cycle surges, and maintains thermal stability via RθJA = 100 °C/W and RθJL = 20 °C/W - enabling robust protection in high-reliability automotive and industrial environments without derating below 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before clamping begins |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed symmetric breakdown threshold in both directions |
| IPPM | 4.8 A - peak pulse current at which clamping voltage reaches 126 V (10/1000 μs waveform) |
| VC | 126 V - maximum clamped voltage during rated surge, limiting downstream IC stress |
| PPPM | 600 W - peak pulse power handling capacity under standardized 10/1000 μs transient |
| TJ max | +150 °C - enables operation in under-hood automotive and high-temperature industrial enclosures |
| Leakage (ID) | <1.0 μA at 78 V - negligible standby power loss and signal integrity impact |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, bidirectional configuration with no polarity marking; matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (positive polarity) | Accepts surge energy during positive half-cycle; connects to protected line |
| Cathode | Transient current entry (negative polarity) | Accepts surge energy during negative half-cycle; connects to protected line |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC performance in both directions eliminates need for polarity-aware layout |
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing |
| 600 W peak pulse rating | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-to-earth, 2 kV line-to-line) without degradation |
| Low-profile SMBG package | Height ≤0.030" (0.76 mm) enables dense PCB layouts and compatibility with automated pick-and-place |
| MSL Level 1 rating | Unlimited floor life and 260 °C peak reflow tolerance simplify manufacturing and eliminate bake requirements |
Applications
| Automotive Sensor Protection | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting CAN/LIN bus transceivers and analog sensor outputs (e.g., pressure, temperature) from load-dump and inductive switching transients in vehicle ECUs. IC Role / Device Role / Timing Role: Bidirectional TVS placed directly at connector interface to clamp ±100 V transients before reaching signal conditioning circuitry. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V microcontrollers and ADC front-ends by limiting voltage to ≤126 V during 4.8 A surge events. | Use Scenario: Safeguarding PLC digital input modules against field-wiring induced surges from solenoid coils, relay contacts, and motor drives. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 24 V DC input lines, mounted adjacent to terminal block to intercept transients before optocoupler isolation stage. Use Value: Maintains system uptime by absorbing 600 W transient energy without failure, supporting >100,000 surge cycles per MIL-STD-883H Method 3015.7. |
| Telecom Line Interface Protection | Consumer Appliance Motor Control |
Use Scenario: Shielding Ethernet PHYs, RS-485 transceivers, and PoE injectors from lightning-induced surges on outdoor cabling or building ground loops. IC Role / Device Role / Timing Role: First-stage protector on differential pairs, used with common-mode chokes to meet IEC 61000-4-5 surge immunity requirements. Use Value: Achieves <1 ns response time and sub-130 V clamping to preserve signal integrity and prevent PHY reset during 10/1000 μs transients. | Use Scenario: Suppressing back-EMF spikes generated by brushed DC motors in washing machines, HVAC blowers, and power tools. IC Role / Device Role / Timing Role: Snubber across motor terminals or flyback path in H-bridge gate drivers to limit voltage overshoot during PWM commutation. Use Value: Enables use of lower-voltage MOSFETs (e.g., 100 V rating) by clamping inductive kick to ≤126 V, reducing BOM cost and board area. |
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 | Same VWM/VBR/PPPM, but unqualified per AEC-Q101; RθJA = 110 °C/W vs. 100 °C/W | Limited to commercial/industrial use; not approved for automotive ECUs or ADAS modules | Select SMBG78CAHE3/52 when AEC-Q101 compliance and tighter thermal resistance are required |
| SMCJ78CA | Higher PPPM = 1500 W, larger SMC (DO-214AB) package, VC = 127 V at 12.3 A | Used where higher surge margin is needed (e.g., AC mains input stages); incompatible with SMBG footprint | Choose SMBG78CAHE3/52 for space-constrained designs requiring AEC-Q101 and SMBG-compatible layout |
Compared with SMBJ78CA and SMCJ78CA, the SMBG78CAHE3/52 uniquely combines automotive qualification, optimized thermal performance, and compact SMBG packaging - making it the preferred choice for high-density, mission-critical transient protection where footprint, reliability, and regulatory compliance are jointly constrained.
Availability
SMBG78CAHE3/52 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC I/O modules, telecom line protection circuits, and consumer appliance motor control systems requiring stable component supply and long-term lifecycle support.
Supply support for SMBG78CAHE3/52 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, efficiency, and application-specific optimization.
The SMBG series was engineered specifically for high-reliability surface-mount transient suppression in automotive and industrial environments, prioritizing AEC-Q101 compliance, low-profile packaging, and consistent bidirectional clamping performance.
FAQ
What does the "HE3/52" suffix indicate in SMBG78CAHE3/52?
The "HE3" suffix denotes RoHS-compliant construction with AEC-Q101 qualification and matte tin plating; "/52" specifies packaging in 7" diameter tape-and-reel format with 750 units per reel. This distinguishes SMBG78CAHE3/52 from non-automotive variants like SMBG78CA-E3/52 (industrial grade only) and confirms full automotive reliability validation per JESD22-A108 and AEC-Q101 stress tests.
Is SMBG78CAHE3/52 suitable for protecting 24 V DC industrial control inputs?
Yes - SMBG78CAHE3/52 is explicitly rated for 78 V stand-off, providing ample margin above 24 V nominal systems while clamping transients to ≤126 V. Its 600 W peak pulse rating handles IEC 61000-4-4 EFT bursts and 10/1000 μs surges common in factory automation, and its AEC-Q101 qualification ensures robustness against thermal cycling and vibration encountered in industrial enclosures.
How does SMBG78CAHE3/52 differ from unidirectional SMBG78AHE3/52?
SMBG78CAHE3/52 is bidirectional with symmetrical VBR and clamping in both polarities and no cathode band marking; SMBG78AHE3/52 is unidirectional, featuring a cathode band, forward voltage drop (~3.5 V at 50 A), and higher IFSM (100 A). Use SMBG78CAHE3/52 for AC-coupled or polarity-agnostic lines (e.g., differential buses); choose SMBG78AHE3/52 only when DC polarity is fixed and forward conduction must be supported.
What is the maximum allowable PCB pad size for optimal thermal performance of SMBG78CAHE3/52?
Per Vishay's datasheet, optimal thermal performance requires mounting SMBG78CAHE3/52 on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Larger pads improve heat dissipation and surge current handling, but the specified size achieves the rated RθJA = 100 °C/W and supports full 600 W pulse power without exceeding TJ = 150 °C under 0.01% duty cycle conditions.
Does SMBG78CAHE3/52 meet UL 497B recognition requirements?
Yes - SMBG78CAHE3/52 carries Underwriters Laboratories recognition under UL 497B (QVGQ2) and file number E136766 for both unidirectional and bidirectional configurations. This certification validates its suitability as a primary protector in telecommunications, data line, and low-voltage signal interface applications subject to UL safety compliance.
SMBG78CAHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-215AA, SMB Gull Wing
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78CAHE3/52 FAQ
1.How can I place an order for SMBG78CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78CAHE3/52 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 SMBG78CAHE3/52 reliable?
The price and inventory of SMBG78CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBG78CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78CAHE3/52?
SMBG78CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78CAHE3/52 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 SMBG78CAHE3/52?
For technical support, including SMBG78CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78CAHE3/52 requirements.
6.How does Aetrix verify that SMBG78CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBG78CAHE3/52 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 SMBG78CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBG78CAHE3/52?
All SMBG78CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78CAHE3/52, 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 SMBG78CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBG78CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78CAHE3/52 Tags
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