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Vishay General Semiconductor - Diodes Division SMBJ78CAHM3_B/I
- Part No.:
- SMBJ78CAHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CAHM3_B/I.pdf
- Description:
- 600W,78V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:6,585
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Product details
Overview
SMBJ78CAHM3_B/I from Vishay General Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) 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, and operates across -55 °C to +150 °C junction temperature.
For engineers reviewing the SMBJ78CAHM3_B/I datasheet, SMBJ78CAHM3_B/I pinout, SMBJ78CAHM3_B/I application, or SMBJ78CAHM3_B/I equivalent, this device is selected for high-reliability surge suppression in automotive power rails, industrial sensor interfaces, and telecom line protection where bidirectional clamping, low leakage (<1.0 µA at VWM), and AEC-Q101 qualification are required.
Technical Context
This bidirectional TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1 ns), low incremental surge resistance, and stable clamping under repetitive transients. Its symmetrical I-V characteristic enables identical protection in both polarities without polarity-sensitive layout constraints.
Designed for surface-mount assembly on standard PCB copper pads (0.2" × 0.2"), it meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile and supports automated placement. The halogen-free, RoHS-compliant HM3 suffix confirms compliance with JESD201 Class 2 whisker resistance and UL 94 V-0 molding compound rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before significant leakage begins; defines safe working margin below clamping threshold. |
| VBR min/max | 86.7 V / 95.8 V at 1 mA - Confirmed breakdown range ensures predictable turn-on during transients without premature conduction. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage limits downstream component stress during 600 W surge events. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage preserves signal integrity and minimizes standby power loss in high-impedance circuits. |
| PPPM | 600 W (10/1000 µs) - Peak pulse power rating validated for lightning-induced surges and inductive switching spikes. |
| TJ max | +150 °C - High junction temperature rating supports operation in under-hood automotive and industrial environments. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm length, 4.06 mm width, and 2.20 mm height for space-constrained layouts. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking; symmetrical terminals enable mounting without orientation constraints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry point (positive polarity) | Accepts surge current during positive-going transients; forms one half of symmetrical clamping path. |
| Cathode | Transient current entry point (negative polarity) | Accepts surge current during negative-going transients; completes bidirectional clamping function with Anode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including engine control units and body electronics requiring long-term reliability under thermal cycling and vibration. |
| Halogen-free & RoHS-compliant (HM3) | Meets environmental compliance mandates for global OEMs and eliminates corrosive halogen emissions during soldering or end-of-life processing. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth, 2 kV line-line) when properly mounted on recommended copper pads. |
| MSL Level 1 moisture sensitivity | Enables direct placement without baking or dry-pack handling, reducing manufacturing cost and process complexity. |
| Low clamping ratio (VC/VBR ≈ 1.32) | Minimizes overvoltage overshoot during clamping, protecting downstream MOSFETs, ICs, and analog front-ends more effectively than higher-ratio suppressors. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V battery-fed ECUs against load dump and alternator ripple transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between power rail and ground to shunt surge energy before reaching voltage regulators and microcontrollers. Use Value: Withstands 600 W pulses and operates up to +150 °C, enabling reliable protection in under-hood environments without derating. | Use Scenario: Safeguarding 4–20 mA current-loop sensors and RS-485 transceivers from ESD and field-induced surges. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) bidirectional TVS placed across differential signal lines or supply-to-ground to prevent latch-up and gate oxide damage. Use Value: Sub-ns response and symmetrical clamping preserve signal fidelity while limiting voltage excursion to ≤126 V during 4.8 A transients. |
| Telecom Line Surge Suppression | Consumer Power Adapter Input Protection |
Use Scenario: Front-end protection of DSL, POTS, or PoE-powered equipment connected to outside plant wiring. IC Role / Device Role / Timing Role: Primary surge arrestor bridging tip/ring lines to chassis ground, coordinated with GDT or MOV secondary protection stages. Use Value: 78 V VWM aligns with nominal telecom line voltages; 126 V clamping ensures compatibility with 150 V-rated interface ICs. | Use Scenario: Secondary-side DC input protection in USB-C PD adapters and AC/DC wall adapters exposed to user-handling ESD. IC Role / Device Role / Timing Role: Fast-reacting TVS placed after rectification but before primary controller ICs to absorb contact discharge events. Use Value: Halogen-free HM3 construction satisfies IEC 62368-1 flammability and environmental requirements for consumer end products. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHE3_B/I | Same electrical specs; RoHS-compliant but not halogen-free; lacks JESD201 Class 2 whisker resistance certification. | Suitable for commercial-grade industrial or computing applications where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs halogen-free compliance or automotive qualification needs. |
| SMCJ78CAHM3_A | Higher power rating (1500 W), larger SMC (DO-214AB) package; identical VWM, VBR, and VC values. | Better suited for systems requiring higher surge margin (e.g., outdoor telecom cabinets) where board space allows larger footprint. | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and PCB layout accommodates 7.11 mm × 6.22 mm outline. |
Compared with SMBJ78CAHE3_B/I, the SMBJ78CAHM3_B/I adds halogen-free and whisker-resistant qualifications without sacrificing electrical performance; versus SMCJ78CAHM3_A, it trades 2.5× peak power for 30% smaller PCB area and lower thermal mass-critical for compact automotive modules.
Availability
SMBJ78CAHM3_B/I is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and telecom line surge suppression requiring stable component supply across multi-year production cycles.
Supply support for SMBJ78CAHM3_B/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 diodes, MOSFETs, optoelectronics, and passive components with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is part of Vishay's TRANSZORB® TVS portfolio, engineered specifically for high-speed, high-energy transient suppression in automotive, industrial, and communications infrastructure where AEC-Q101 qualification and consistent clamping performance are mandatory.
FAQ
What does the "CA" suffix indicate in SMBJ78CAHM3_B/I?
The "CA" suffix denotes a bidirectional configuration, meaning SMBJ78CAHM3_B/I provides symmetrical transient voltage suppression for both positive and negative polarity surges. Unlike unidirectional variants (e.g., SMBJ78A), it has no cathode band marking and exhibits identical VBR, VC, and leakage characteristics in either direction-ideal for AC-coupled or floating signal lines where polarity is undefined.
Is SMBJ78CAHM3_B/I qualified for automotive use?
Yes, SMBJ78CAHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code structure (HM3 suffix with "_B/I" tape-and-reel variant). This qualification covers stress tests including high-temperature operating life, temperature cycling, and mechanical shock-making SMBJ78CAHM3_B/I suitable for engine control, body electronics, and ADAS modules where reliability under harsh conditions is critical.
What is the maximum clamping voltage of SMBJ78CAHM3_B/I and under what test condition?
The maximum clamping voltage of SMBJ78CAHM3_B/I is 126 V, measured at a peak pulse current (IPPM) of 4.8 A using a 10/1000 µs double-exponential waveform. This value is guaranteed per Vishay's datasheet (Document Number 88392, Rev. 09-Jan-2024) and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
How does the HM3 suffix differ from E3 or HE3 in SMBJ78CAHM3_B/I?
The HM3 suffix in SMBJ78CAHM3_B/I indicates halogen-free, RoHS-compliant construction with JESD201 Class 2 whisker resistance-distinct from E3 (RoHS only) and HE3 (AEC-Q101 + RoHS). All three share identical electrical specs, but HM3 adds environmental and reliability enhancements required by Tier 1 automotive suppliers and green electronics standards like IEC 61249-2-21.
Can SMBJ78CAHM3_B/I be used in place of a unidirectional TVS like SMBJ78AHM3_B/I?
No-SMBJ78CAHM3_B/I is strictly bidirectional and cannot replace unidirectional devices such as SMBJ78AHM3_B/I in DC-biased circuits where forward conduction must be blocked. Attempting substitution risks unintended forward conduction during normal operation. Use SMBJ78CAHM3_B/I only where symmetrical protection is required, e.g., AC lines, differential data buses, or floating grounds.
SMBJ78CAHM3_B/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):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 126V
- Current - Peak Pulse (10/1000µs):
- 4.8A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ78CAHM3_B/I FAQ
1.How can I place an order for SMBJ78CAHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CAHM3_B/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 SMBJ78CAHM3_B/I reliable?
The price and inventory of SMBJ78CAHM3_B/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CAHM3_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ78CAHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CAHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CAHM3_B/I?
SMBJ78CAHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CAHM3_B/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 SMBJ78CAHM3_B/I?
For technical support, including SMBJ78CAHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CAHM3_B/I requirements.
6.How does Aetrix verify that SMBJ78CAHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ78CAHM3_B/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 SMBJ78CAHM3_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ78CAHM3_B/I?
All SMBJ78CAHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CAHM3_B/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 SMBJ78CAHM3_B/I part is unused and in its original packaging.
Return procedure for SMBJ78CAHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CAHM3_B/I Tags
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