My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBG78CA-M3/5B
- Part No.:
- SMBG78CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78CA-M3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,453
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBG78CA-M3/5B 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), <126 V clamping voltage at peak surge current, and AEC-Q101 qualification for automotive use.
For engineers reviewing the SMBG78CA-M3/5B datasheet, SMBG78CA-M3/5B pinout, SMBG78CA-M3/5B application, or SMBG78CA-M3/5B equivalent, key selection criteria include bidirectional clamping capability, 78 V operating voltage margin, low leakage (<1 µA at VWM), thermal resistance (RθJA = 100 °C/W), and halogen-free RoHS compliance per M3 suffix.
Technical Context
This device operates as a voltage-clamped shunt protector: under normal conditions it presents high impedance (>1 MΩ), but triggers into low-impedance conduction when reverse voltage exceeds VBR, diverting surge energy to ground. Its glass-passivated junction ensures stable breakdown and fast response (<1 ns), while the bidirectional symmetry enables protection on AC-coupled or floating lines without polarity concerns.
The SMBG78CA-M3/5B is rated for repetitive 10/1000 µs surges at 0.01% duty cycle, with peak pulse current (IPPM) of 4.8 A and maximum clamping voltage (VC) of 126 V. Junction temperature range spans −55 °C to +150 °C, and it meets J-STD-020 MSL Level 1 with 260 °C reflow peak.
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 - Confirmed breakdown threshold range for reliable triggering |
| VC @ IPPM | 126 V - Clamped voltage during 4.8 A 10/1000 µs surge; defines protected circuit's max stress level |
| PPPM | 600 W - Peak transient power handling capacity under standard waveform |
| IPPM | 4.8 A - Maximum non-repetitive surge current the device safely clamps |
| ID @ VWM | <1 µA - Reverse leakage ensuring minimal standby power loss and signal integrity |
| TJ Range | −55 °C to +150 °C - Full operational range supporting under-hood automotive and industrial environments |
Pinout & Package
Package: SMBG (DO-215AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Case meets UL 94 V-0; no polarity marking for bidirectional configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Connects to protected line; conducts during positive or negative overvoltage events |
| Cathode | Transient return path (bidirectional) | Connects to protected line; symmetric with anode-no functional distinction in CA devices |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection on AC, differential, or floating signal lines without polarity constraints |
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V systems with margin |
| AEC-Q101 qualified | Validated for automotive powertrain, body electronics, and ADAS modules requiring reliability certification |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (e.g., ISO 7637-2 pulses) |
| MSL Level 1, 260 °C peak | Supports standard lead-free reflow without preconditioning or baking |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and alternator transients per ISO 7637-2. IC Role / Device Role: Shunt TVS placed across power input to clamp spikes before they reach LDOs or microcontrollers. Use Value: Withstand 35 V/100 ms load dump events by clamping to ≤126 V, preserving downstream ICs rated for 36 V absolute max. | Use Scenario: Safeguarding RS-485 transceivers connected to long field wiring exposed to lightning-induced surges. IC Role / Device Role: Bidirectional TVS on differential bus lines (A/B) referenced to ground. Use Value: Symmetric clamping limits common-mode and differential transients to safe levels without distorting signal integrity up to 10 Mbps. |
| Automotive CAN Bus Protection | Consumer Power Adapter Input Stage |
Use Scenario: Guarding high-speed CAN FD nodes (5 Mbps) against ESD and coupled noise in vehicle networks. IC Role / Device Role: Low-capacitance TVS (CJ ≈ 100 pF at 0 V) placed on CANH/CANL lines near connector. Use Value: Clamps ±25 kV contact ESD (IEC 61000-4-2) while adding <0.5 ns propagation delay, maintaining signal edge fidelity. | Use Scenario: Input-stage surge suppression in USB-C PD adapters subjected to AC line transients and hot-plug events. IC Role / Device Role: Primary clamping device across bulk capacitor input (post-bridge, pre-PFC). Use Value: Absorbs 600 W line-to-ground surges (IEC 61000-4-5) without degradation, enabling compact design vs. MOV+gas-tube alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CA-M3/5B | Same VWM/VBR/VC, but lower PPPM = 600 W (same rating), different package: SMB (DO-214AA), slightly larger footprint | SMB package has higher RθJA (~125 °C/W); less suitable for high-density automotive PCBs | Select SMBG78CA-M3/5B for space-constrained layouts requiring DO-215AA's smaller pad area and lower thermal resistance. |
| 1.5KE78CA-T | Higher PPPM = 1500 W, axial leaded DO-201AD package, VC = 129 V, slower response due to lead inductance | Not SMT-compatible; unsuitable for automated assembly or high-frequency surge suppression | Choose SMBG78CA-M3/5B for surface-mount production, board-level ESD immunity, and tighter layout control. |
Compared with SMBJ78CA-M3/5B and 1.5KE78CA-T, the SMBG78CA-M3/5B delivers identical clamping performance in a smaller, thermally superior SMT package with AEC-Q101 validation-making it optimal for next-gen automotive and industrial modules where density, reliability, and reflow compatibility are critical.
Availability
SMBG78CA-M3/5B is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, CAN bus nodes, and consumer power adapter designs requiring stable component supply and long-term lifecycle support.
Supply support for SMBG78CA-M3/5B 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, automotive qualification, and high-volume manufacturability.
The SMBG series is engineered for robust transient suppression in harsh environments-specifically targeting automotive, industrial, and telecom applications where AEC-Q101 compliance, low leakage, and precise clamping are mandatory.
FAQ
What is the clamping voltage of SMBG78CA-M3/5B at its rated peak pulse current?
The SMBG78CA-M3/5B has a maximum clamping voltage (VC) of 126 V when subjected to its peak pulse current (IPPM) of 4.8 A under the standard 10/1000 µs waveform. This value defines the upper voltage limit imposed on protected circuitry during surge events and is measured per ANSI/IEEE C62.35. The SMBG78CA-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBG78CA-M3/5B suitable for automotive applications?
Yes, SMBG78CA-M3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, body electronics, and infotainment systems. Its −55 °C to +150 °C junction temperature range, MSL Level 1 reflow compatibility, and validation against ISO 7637-2 load dump and IEC 61000-4-2 ESD make it appropriate for under-hood and cabin-mounted modules. The SMBG78CA-M3/5B meets all required stress tests per the AEC-Q101 standard.
How does the bidirectional configuration of SMBG78CA-M3/5B affect its circuit placement?
The SMBG78CA-M3/5B has no polarity marking and functions identically in both directions, allowing direct placement across AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating power rails without orientation concerns. Unlike unidirectional TVS diodes, the SMBG78CA-M3/5B eliminates risk of incorrect installation and simplifies layout-especially in high-density automotive PCBs where routing symmetry improves EMC performance.
What is the reverse leakage current specification for SMBG78CA-M3/5B at its stand-off voltage?
At its 78 V stand-off voltage (VWM), the SMBG78CA-M3/5B exhibits a maximum reverse leakage current (ID) of 1 µA at 25 °C, rising to ≤5 µA at 125 °C per derating curves. This ultra-low leakage preserves signal integrity in high-impedance sensor interfaces and minimizes quiescent power loss in always-on automotive modules. The SMBG78CA-M3/5B achieves this while maintaining tight VBR tolerance (86.7–95.8 V).
Does SMBG78CA-M3/5B require additional external components for basic transient protection?
No, SMBG78CA-M3/5B operates as a standalone shunt protector and requires only PCB traces connecting it between the protected line and ground (or reference rail). No series impedance or filtering is needed for fundamental surge clamping. However, for high-frequency ESD (e.g., >500 MHz), pairing with a small ferrite bead may improve insertion loss-though the SMBG78CA-M3/5B itself provides complete protection per IEC 61000-4-2 Level 4 and ISO 10605 standards.
SMBG78CA-M3/5B 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78CA-M3/5B FAQ
1.How can I place an order for SMBG78CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78CA-M3/5B 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 SMBG78CA-M3/5B reliable?
The price and inventory of SMBG78CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBG78CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78CA-M3/5B?
SMBG78CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78CA-M3/5B 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 SMBG78CA-M3/5B?
For technical support, including SMBG78CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78CA-M3/5B requirements.
6.How does Aetrix verify that SMBG78CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG78CA-M3/5B 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 SMBG78CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBG78CA-M3/5B?
All SMBG78CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78CA-M3/5B, 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 SMBG78CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBG78CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78CA-M3/5B Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Comparator circuit design covering voltage thresholds, input limits, open-collector outputs, LM393 wiring, op-amp differences, hysteresis, timing, window detection and practical fault diagnosis.
Schmitt triggers use separate rising and falling thresholds to stabilize slow or noisy signals. This guide covers hysteresis, 74HC14 and 74HCT14 selection, comparator calculations, RC oscillators and p…
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
