My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBG78CA-E3/5B
- Part No.:
- SMBG78CA-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78CA-E3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,412
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBG78CA-E3/5B 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 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 electronics protection.
For engineers reviewing the SMBG78CA-E3/5B datasheet, SMBG78CA-E3/5B pinout, SMBG78CA-E3/5B application, or SMBG78CA-E3/5B equivalent, this device is selected for robust ESD and surge immunity in CAN bus interfaces, sensor supply rails, and automotive infotainment power inputs where bidirectional clamping and high-reliability packaging are required.
Technical Context
This bidirectional TVS operates symmetrically across both polarities, with identical VBR, IPPM, and VC specifications in either direction. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ns), enabling effective suppression of EFT (IEC 61000-4-4) and lightning-induced surges (IEC 61000-4-5).
The SMBG78CA-E3/5B uses a low-inductance SMBG (DO-215AA) surface-mount package with matte tin-plated leads compliant to J-STD-002 and JESD 22-B102. Thermal resistance is RθJA = 100 °C/W (on 0.2" × 0.2" copper pads), supporting operation from –55 °C to +150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 72 V nominal automotive systems. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 126 V - Clamped voltage at peak pulse current; limits downstream IC stress during 600 W transient events. |
| IPPM | 4.8 A - Peak pulse current capability under 10/1000 µs waveform; sufficient for ISO 7637-2 Pulse 1/2/5a compliance testing. |
| Leakage (ID) | <1.0 µA at 78 V - Minimal standby power loss and signal integrity impact on high-impedance sensor lines. |
| Package | SMBG (DO-215AA) - Industry-standard low-profile SMD outline; compatible with automated pick-and-place and reflow profiles up to 260 °C peak. |
| AEC-Q101 | Qualified - Validated for automotive-grade reliability including temperature cycling, HAST, and mechanical shock per AEC standard. |
Pinout & Package
SMBG78CA-E3/5B is housed in an SMBG (DO-215AA) surface-mount package with two terminals: anode and cathode. As a bidirectional device, it has no polarity marking; both terminals function identically in either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Provides symmetrical conduction path for positive or negative transients; connects to protected line or ground reference. |
| Cathode | Transient return path (bidirectional) | Electrically identical to anode; no functional distinction - device operates identically regardless of orientation. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power | Withstands repetitive 10/1000 µs surges at 0.01% duty cycle - suitable for automotive load-dump and inductive switching events. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes voltage overshoot during clamping - critical for safeguarding 80 V-rated MOSFETs and microcontrollers. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free assembly without moisture sensitivity limitations or baking requirements. |
| Glass passivated junction | Ensures long-term stability of leakage and breakdown parameters under thermal cycling and humidity exposure. |
Applications
| Automotive CAN Bus Protection | Engine Control Unit (ECU) Power Input |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L differential pair against ESD and coupled transients in vehicle wiring harnesses. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed between CAN lines and ground to limit common-mode surges without disrupting data integrity. Use Value: Maintains signal fidelity below 126 V clamping level while surviving ISO 10605 ±30 kV contact discharge events. |
Use Scenario: Safeguarding 78 V-rated power input rails of engine control modules exposed to load dump pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main 12 V/24 V supply input, triggered within nanoseconds of transient onset. Use Value: Limits rail voltage to ≤126 V during ISO 7637-2 Pulse 5a (75 V, 100 ms), preventing brownout or latch-up in downstream regulators. |
| ADAS Camera Sensor Supply Line | Infotainment Display Backlight Driver |
Use Scenario: Shielding 5–12 V bias supplies feeding CMOS image sensors in radar or camera modules. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) bidirectional suppressor placed at sensor PCB entry point to absorb board-level ESD. Use Value: Prevents pixel corruption or reset events caused by sub-100 ns transients, leveraging <1.0 ns response time. |
Use Scenario: Protecting LED driver ICs and boost converters powering LCD backlights in head units. IC Role / Device Role / Timing Role: Clamp on DC-DC output rail to suppress ringing and inductive kickback from long flex cables. Use Value: Ensures sustained operation under repeated 600 W surges without parameter drift, validated per AEC-Q101 lifetime testing. |
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-E3/5B | Same VWM (78 V) and bidirectional configuration, but lower PPPM (600 W vs. SMBG78CA's 600 W); identical SMB package but slightly larger thermal pad footprint. | Marginally higher RθJA (110 °C/W vs. 100 °C/W); less suitable for high-density layouts with limited copper area. | Select SMBG78CA-E3/5B when board space is constrained and thermal performance must be maximized on minimal copper pads. |
| SMCJ78CA-E3/5B | Higher PPPM (1500 W), same VWM and VBR, but larger SMC (DO-214AB) package (7.11 mm × 6.22 mm vs. SMBG's 4.57 mm × 3.94 mm). | Requires more PCB area and higher assembly cost; better suited for primary-level surge protection rather than point-of-load clamping. | Choose SMBG78CA-E3/5B for secondary-level, space-constrained protection where 600 W suffices and footprint minimization is critical. |
Compared with SMBJ78CA-E3/5B and SMCJ78CA-E3/5B, the SMBG78CA-E3/5B delivers identical electrical protection in a smaller footprint and lower thermal resistance, making it optimal for dense automotive ECUs where layout area and thermal management are tightly coupled constraints.
Availability
SMBG78CA-E3/5B is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and consumer appliance power supply protection requiring stable component supply and AEC-Q101-compliant reliability.
Supply support for SMBG78CA-E3/5B 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, and protection devices with emphasis on reliability, efficiency, and automotive-grade qualification.
The SMBG series was engineered specifically for high-density, high-reliability transient suppression in automotive and industrial environments where space, thermal performance, and AEC-Q101 validation are mandatory design criteria.
FAQ
What is the clamping voltage of SMBG78CA-E3/5B at its rated peak pulse current?
The SMBG78CA-E3/5B exhibits a maximum clamping voltage (VC) of 126 V at its peak pulse current (IPPM) of 4.8 A under the standardized 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88456 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBG78CA-E3/5B maintains this clamping performance consistently across its operating temperature range.
Is SMBG78CA-E3/5B suitable for automotive applications?
Yes, SMBG78CA-E3/5B is AEC-Q101 qualified and explicitly rated for automotive use, including engine control units, ADAS sensors, and infotainment systems. Its construction - glass-passivated junction, MSL Level 1 rating, and operation from –55 °C to +150 °C - meets stringent automotive environmental and reliability requirements. The SMBG78CA-E3/5B is referenced in Vishay's automotive-grade ordering codes (e.g., HE3/HM3 suffix variants).
How does the bidirectional nature of SMBG78CA-E3/5B affect its placement on the PCB?
The SMBG78CA-E3/5B has no polarity marking and functions identically regardless of orientation, simplifying layout and eliminating risk of reverse installation. This bidirectional behavior means it can protect AC signals, floating buses like CAN, or dual-rail supplies without requiring directional alignment. Unlike unidirectional TVS diodes, the SMBG78CA-E3/5B does not require cathode band alignment during automated placement.
What is the maximum leakage current of SMBG78CA-E3/5B at its stand-off voltage?
At its 78 V stand-off voltage (VWM), the SMBG78CA-E3/5B guarantees a maximum reverse leakage current (ID) of 1.0 µA at 25 °C, per the Electrical Characteristics table in Vishay document 88456. This ultra-low leakage preserves signal integrity on high-impedance sensor lines and minimizes standby power loss in battery-powered automotive modules using the SMBG78CA-E3/5B.
Does SMBG78CA-E3/5B meet RoHS and halogen-free requirements?
Yes, the "E3" suffix in SMBG78CA-E3/5B denotes RoHS-compliant, industrial-grade construction with matte tin-plated leads. While not halogen-free (that requires "M3" suffix), the SMBG78CA-E3/5B satisfies JEDEC JESD201 Class 2 whisker resistance and UL 94 V-0 flammability standards. Full compliance documentation is available under Vishay's material categorization system (doc?99912).
SMBG78CA-E3/5B 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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78CA-E3/5B FAQ
1.How can I place an order for SMBG78CA-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78CA-E3/5B 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-E3/5B reliable?
The price and inventory of SMBG78CA-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78CA-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBG78CA-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78CA-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78CA-E3/5B?
SMBG78CA-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78CA-E3/5B 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-E3/5B?
For technical support, including SMBG78CA-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78CA-E3/5B requirements.
6.How does Aetrix verify that SMBG78CA-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG78CA-E3/5B 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-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBG78CA-E3/5B?
All SMBG78CA-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78CA-E3/5B, 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-E3/5B part is unused and in its original packaging.
Return procedure for SMBG78CA-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78CA-E3/5B 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 …
