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Vishay General Semiconductor - Diodes Division SMBG78CAHE3/5B
- Part No.:
- SMBG78CAHE3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMBG78CAHE3/5B.pdf
- Description:
- TVS DIODE 78VWM 126VC DO215AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,771
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Product details
Overview
SMBG78CAHE3/5B from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMBG (DO-215AA) package, designed for robust overvoltage protection of sensitive electronics. 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), clamping voltage of 126 V at 4.8 A peak pulse current, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMBG78CAHE3/5B datasheet, SMBG78CAHE3/5B pinout, SMBG78CAHE3/5B application, or SMBG78CAHE3/5B equivalent, key selection criteria include bidirectional surge suppression capability, low clamping ratio (VC/VBR ≈ 1.32), MSL Level 1 reflow compatibility, RoHS-compliant matte tin terminations, and suitability for automotive sensor line and power rail protection where repetitive transients up to 0.01% duty cycle occur.
Technical Context
This device operates as a voltage-clamped shunt protector with symmetrical avalanche behavior in both polarities, enabling suppression of positive and negative transients without polarity sensitivity. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 μA at 78 V), while the low incremental surge resistance supports fast energy diversion during ESD or load-dump events.
The SMBG78CAHE3/5B is thermally rated for TJ = –55 °C to +150 °C and exhibits RθJA = 100 °C/W (on 5.0 mm × 5.0 mm copper pads), making it suitable for compact PCB layouts with moderate thermal management. It meets UL 497B recognition and complies with ANSI/IEEE C62.35 surge waveform standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed bidirectional avalanche threshold range; ensures predictable turn-on under surge conditions |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage during 10/1000 μs transient; limits downstream voltage stress to ≤126 V |
| PPPM | 600 W - Peak pulse power handling per 10/1000 μs waveform; supports automotive ISO 7637-2 Pulse 1/2/5a energy levels |
| IPPM | 4.8 A - Peak pulse current corresponding to VC; used to size series impedance for current limiting |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments |
| Qualification | AEC-Q101 qualified - Validated for automotive electronic systems requiring high-reliability discrete protection devices |
Pinout & Package
Package: SMBG (DO-215AA) - Surface-mount, low-profile gull-wing package with 2.10 mm body width, 6.48 mm length, and 0.76 mm height; meets UL 94 V-0 flammability rating and J-STD-020 MSL Level 1 (260 °C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | Connected to protected line (e.g., CAN_H or LIN bus); no marking on bidirectional variants |
| Cathode | Current exit terminal in forward bias; symmetrical with Anode in bidirectional operation | Connected to ground or reference rail; terminals are electrically identical and interchangeable in SMBG78CAHE3/5B |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN FD) without polarity concerns |
| 600 W peak pulse power | Handles ISO 7637-2 Pulse 5a (load dump) surges up to 126 V clamp level without degradation |
| AEC-Q101 qualification | Validated for automotive powertrain, chassis, and ADAS modules requiring extended temperature and lifetime reliability |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage overshoot during fast transients, reducing risk of IC latch-up or gate oxide damage |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 μA) across temperature and life cycle |
Applications
| Automotive Power Rail Protection | CAN Bus Transient Suppression |
|---|---|
Use Scenario: Protecting 12 V battery-fed ECUs against load dump and jump-start transients per ISO 7637-2. IC Role / Device Role / Timing Role: Shunt TVS placed between power rail and ground to clamp surges above 78 V. Use Value: Limits rail voltage to ≤126 V during 600 W pulses, preventing damage to downstream DC-DC converters and microcontrollers. |
Use Scenario: Safeguarding high-speed CAN FD transceivers from ESD and inductive switching noise on vehicle networks. IC Role / Device Role / Timing Role: Bidirectional clamping element across CAN_H/CAN_L differential pair. Use Value: Symmetrical breakdown ensures equal protection of both signal lines without polarity constraints or added components. |
| Industrial Sensor Interface Protection | Telecom Line Surge Guarding |
Use Scenario: Shielding analog and digital outputs of pressure/temperature sensors in factory automation equipment. IC Role / Device Role / Timing Role: Low-capacitance (<50 pF typical) shunt protector on sensor output traces. Use Value: Clamps fast transients (e.g., relay coil kickback) while preserving signal integrity due to minimal parasitic loading. |
Use Scenario: Hardening Ethernet PHY or DSL line drivers against lightning-induced surges in outdoor telecom cabinets. IC Role / Device Role / Timing Role: Primary-level TVS on unshielded twisted-pair inputs before isolation transformers. Use Value: Withstands repetitive 10/1000 μs surges at 0.01% duty cycle, extending system uptime in harsh environments. |
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 (78 V), lower PPPM (600 W same), but SMBJ package (DO-214AA) has larger footprint and higher RθJA (110 °C/W) | Less suitable for space-constrained automotive modules; requires larger pad layout | Select when legacy board design uses SMBJ footprint and thermal derating allows |
| SMCJ78CA | Same VWM, higher PPPM (1500 W), SMC package (DO-214AB) with 2× footprint and 3× thermal mass | Over-specified for most 12 V systems; better for 24 V commercial vehicles or industrial mains input stages | Choose only when >1 kW surge immunity is required and PCB area permits larger SMC outline |
Compared with SMBJ78CA and SMCJ78CA, the SMBG78CAHE3/5B delivers identical electrical protection performance in a smaller, AEC-Q101-qualified SMBG package optimized for modern automotive PCBs-reducing board area by 35% versus SMBJ and 60% versus SMCJ while maintaining full 150 °C junction rating.
Availability
SMBG78CAHE3/5B is available at Aetrix Electronics and suitable for automotive ECU power rail protection, CAN FD interface hardening, industrial sensor signal line safeguarding, and telecom line surge guarding requiring stable component supply and long-term lifecycle support.
Supply support for SMBG78CAHE3/5B 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, efficiency, and automotive-grade validation.
The SMBG series was developed specifically for surface-mount transient suppression in space-constrained, high-reliability applications-targeting automotive, industrial, and telecom markets needing AEC-Q101 compliance and low-profile packaging.
FAQ
What is the maximum clamping voltage of SMBG78CAHE3/5B at its rated peak pulse current?
The SMBG78CAHE3/5B has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 4.8 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 and confirmed in the Vishay datasheet revision 09-Jan-2024. The clamping performance ensures downstream ICs remain within safe operating voltage limits during surge events. SMBG78CAHE3/5B maintains this specification across its full operating temperature range.
Is SMBG78CAHE3/5B suitable for automotive applications requiring AEC-Q101 qualification?
Yes, SMBG78CAHE3/5B is explicitly AEC-Q101 qualified, as indicated by the "HE3" suffix and confirmed in the Vishay mechanical data section. It is rated for junction temperatures from –55 °C to +150 °C and passes stress tests including temperature cycling, humidity bias, and accelerated life testing per AEC-Q101 Rev D. SMBG78CAHE3/5B is approved for use in engine control units, body electronics, and ADAS modules where automotive-grade reliability is mandatory.
Does SMBG78CAHE3/5B have polarity markings on the package?
No, SMBG78CAHE3/5B does not feature polarity markings because it is a bidirectional TVS diode. As stated in the Vishay datasheet, "no marking on bidirectional types." Both terminals are functionally identical-anode and cathode roles reverse depending on transient polarity-so orientation during placement has no electrical impact. This simplifies automated assembly and eliminates risk of incorrect orientation in differential or AC-coupled circuits.
What is the thermal resistance of SMBG78CAHE3/5B, and how does it affect PCB layout?
SMBG78CAHE3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes minimum recommended pad layout per the DO-215AA outline drawing. To maintain safe junction temperature under repetitive surges, designers must allocate adequate copper area and avoid excessive trace length or thermal bottlenecks. SMBG78CAHE3/5B's low RθJA enables compact layouts without forced cooling in most automotive applications.
How does the "5B" in SMBG78CAHE3/5B affect packaging and ordering?
"5B" denotes the preferred package code for 13-inch diameter plastic tape-and-reel delivery, containing 3200 units per reel. This contrasts with "52", which indicates 7-inch reels (750 units). The "HE3" suffix confirms RoHS compliance and AEC-Q101 qualification. SMBG78CAHE3/5B is supplied with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102, supporting standard lead-free reflow profiles. No functional or electrical differences exist between 5B and 52 variants.
SMBG78CAHE3/5B 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBG)
SMBG78CAHE3/5B FAQ
1.How can I place an order for SMBG78CAHE3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBG78CAHE3/5B 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 SMBG78CAHE3/5B reliable?
The price and inventory of SMBG78CAHE3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG78CAHE3/5B is usually 5 days.
3.What payment methods are accepted for SMBG78CAHE3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG78CAHE3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBG78CAHE3/5B?
SMBG78CAHE3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBG78CAHE3/5B 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 SMBG78CAHE3/5B?
For technical support, including SMBG78CAHE3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG78CAHE3/5B requirements.
6.How does Aetrix verify that SMBG78CAHE3/5B is sourced from the original manufacturer or authorized distributors?
All SMBG78CAHE3/5B 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 SMBG78CAHE3/5B meets industry standards.
7.What is the process for return or replacement of SMBG78CAHE3/5B?
All SMBG78CAHE3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBG78CAHE3/5B, 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 SMBG78CAHE3/5B part is unused and in its original packaging.
Return procedure for SMBG78CAHE3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBG78CAHE3/5B Tags
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