My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ78CHE3/52
;;2.jpg)
- Part No.:
- SMBJ78CHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CHE3/52.pdf
- Description:
- TVS DIODE 78VWM 139VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,439
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ78CHE3/52 from Vishay General Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 78 V standoff voltage (VWM), 86.7–95.8 V breakdown range at 1 mA, 126 V maximum clamping voltage at 4.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMBJ78CHE3/52 datasheet, SMBJ78CHE3/52 pinout, SMBJ78CHE3/52 application, or SMBJ78CHE3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, SMB (DO-214AA) package details, clamping performance under surge conditions, and direct alternative part comparisons for ESD and lightning transient protection design.
Technical Context
This TVS diode operates as a unidirectional shunt protector: it remains high-impedance below 78 V and rapidly avalanches above its breakdown threshold to clamp transients. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and repeatable response across temperature (−55 °C to +150 °C).
Designed for automated SMT assembly, SMBJ78CHE3/52 meets J-STD-020 MSL Level 1 (260 °C peak reflow), has matte tin-plated leads, and is qualified to AEC-Q101 - confirming suitability for automotive electronics where reliability under thermal cycling and surge stress is mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before conduction begins; defines safe operating margin for 72–80 V DC rails. |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during fast transients. |
| VC @ IPPM | 126 V at 4.8 A - Clamped voltage during 600 W 10/1000 µs surge; limits downstream IC stress to sub-130 V. |
| PPPM | 600 W - Peak pulse power handling per single transient; supports IEC 61000-4-5 Level 4 (4 kV) compliance when properly laid out. |
| ID @ VWM | <1.0 µA - Ultra-low reverse leakage at rated standoff; prevents measurable power loss in battery-backed or low-quiescent systems. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and sealed industrial enclosures. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.59 mm × 4.06 mm footprint and 2.20 mm height; compatible with IPC-7351B land patterns. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads; cathode indicated by band on body end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction | Connected to system ground or lower-potential rail; forms return path during clamping event. |
| Cathode | Current exit terminal during reverse-biased clamping | Connected to protected line (e.g., 78 V supply rail); conducts surge current to ground when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance - required for engine control, ADAS, and body electronics. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV without degradation when mounted on 5.0 mm × 5.0 mm copper pads. |
| Low clamping ratio (VC/VBR ≈ 1.33) | Ensures minimal overvoltage overshoot during clamping - critical for protecting 80 V-rated MOSFETs and gate drivers. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; supports high-yield automated assembly in volume production. |
| Glass-passivated junction | Provides stable VBR tolerance and long-term parameter consistency across thermal and humidity stress. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: 12 V/24 V vehicle battery input to infotainment head unit exposed to load dump (ISO 16750-2) and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between VIN and GND, clamping transients within 1 ns to protect DC-DC converters and microcontrollers. Use Value: Limits peak voltage to ≤126 V during 600 W surges, preventing latch-up or gate oxide damage in downstream PMICs rated for 130 V absolute max. |
Use Scenario: 4–20 mA current loop interface in factory automation PLC modules subjected to field wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS connected across signal and return lines to suppress ±8 kV contact ESD (IEC 61000-4-2) and 100 V/µs transients from solenoid switching. Use Value: Sub-1 µA leakage at 78 V standoff preserves loop accuracy; 126 V clamping protects precision op-amps and ADC front-ends without adding offset error. |
| Telecom DC Power Feeding Protection | Renewable Energy Charge Controller Interface |
|
Use Scenario: -48 V telecom rectifier output feeding remote radio units, vulnerable to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-stage TVS on DC feed line, coordinated with upstream MOVs to handle multi-kA events while limiting let-through voltage. Use Value: 600 W rating enables coordination with secondary protection; 150 °C TJ max supports operation in sealed outdoor cabinets up to 85 °C ambient. |
Use Scenario: PV array string monitoring circuitry interfacing with 72 V nominal solar charge controllers exposed to rapid irradiance changes and grid coupling transients. IC Role / Device Role / Timing Role: Standoff-matched TVS on voltage sense input to prevent false overvoltage trips and ADC saturation during MPPT voltage spikes. Use Value: Tight 86.7–95.8 V VBR window ensures clamping initiates just above normal operating range (≤78 V), avoiding nuisance triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78AHE3/52 | Same electrical specs and AEC-Q101 qualification; differs only in packaging suffix (HE3 vs HE3) - identical device. | No functional difference; both meet same automotive reliability requirements and thermal derating curves. | Select SMBJ78CHE3/52 when ordering from distributors listing this exact P/N; functionally interchangeable. |
| SMBJ78AHM3/52 | Halogen-free variant (HM3 suffix); otherwise identical VWM, VBR, VC, PPPM, and AEC-Q101 qualification. | Required only where halogen-free BOM compliance is mandated (e.g., EU medical or public infrastructure projects). | Choose SMBJ78AHM3/52 strictly for halogen-free regulatory compliance; no performance trade-off. |
Compared with SMBJ78CHE3/52, SMBJ78AHE3/52 is a packaging-equivalent variant with no electrical or qualification differences, while SMBJ78AHM3/52 adds halogen-free construction without altering clamping behavior or surge capability - enabling compliance-driven selection without redesign.
Availability
SMBJ78CHE3/52 is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC feeding, renewable energy monitoring, and harsh-environment embedded control requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ78CHE3/52 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, MOSFETs, optoelectronics, and passive components with emphasis on reliability and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping performance, AEC-Q101 validation, and standardized SMT compatibility.
FAQ
What is the maximum clamping voltage of SMBJ78CHE3/52 under a 600 W surge?
The SMBJ78CHE3/52 exhibits a maximum clamping voltage (VC) of 126 V at its rated peak pulse current of 4.8 A, corresponding to the 600 W 10/1000 µs waveform. This value is measured per Figure 1 in Vishay Document 88392 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events. The SMBJ78CHE3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ78CHE3/52 qualified for automotive applications?
Yes, SMBJ78CHE3/52 carries AEC-Q101 qualification, confirmed in the Vishay datasheet revision 09-Jan-2024 (Document Number 88392). This certification covers stress tests including high-temperature reverse bias, temperature cycling, and surge endurance - validating its use in engine control units, body electronics, and ADAS subsystems where reliability under thermal and electrical stress is critical. The HE3 suffix explicitly denotes AEC-Q101 compliance.
What is the standoff voltage (VWM) of SMBJ78CHE3/52, and how does it relate to system design?
The standoff voltage (VWM) of SMBJ78CHE3/52 is 78 V - the maximum continuous reverse voltage at which leakage remains below 1.0 µA. This parameter sets the upper limit for normal DC operating voltage on the protected line; designers must ensure system nominal voltage (e.g., 72 V battery rail) stays safely below 78 V to avoid premature conduction. The SMBJ78CHE3/52's 78 V VWM provides a 6 V margin above typical 72 V automotive systems.
Does SMBJ78CHE3/52 have bidirectional capability?
No, SMBJ78CHE3/52 is a unidirectional TVS diode, as indicated by the "A" suffix and absence of "CA" in its part number. It conducts only in reverse bias (cathode-to-anode) during overvoltage events and blocks forward current like a standard diode. For bidirectional protection - such as AC signal lines or differential buses - a variant like SMBJ78CAHE3/52 would be required. The SMBJ78CHE3/52's polarity is marked by a cathode band on the SMB package body.
What is the thermal resistance and power dissipation rating of SMBJ78CHE3/52?
SMBJ78CHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended PCB pads, and a junction-to-lead resistance (RθJL) of 20 °C/W. Its steady-state power dissipation (PD) is rated at 5.0 W at 50 °C ambient on an infinite heatsink. These values inform layout decisions: using 5.0 mm × 5.0 mm copper pads per terminal reduces RθJA and sustains higher surge repetition rates without exceeding the 150 °C maximum junction temperature.
SMBJ78CHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 78V
- Voltage - Breakdown (Min):
- 86.7V
- Voltage - Clamping (Max) @ Ipp:
- 139V
- Current - Peak Pulse (10/1000µs):
- 4.3A
- 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 (SMBJ)
SMBJ78CHE3/52 FAQ
1.How can I place an order for SMBJ78CHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CHE3/52 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 SMBJ78CHE3/52 reliable?
The price and inventory of SMBJ78CHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78CHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CHE3/52?
SMBJ78CHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CHE3/52 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 SMBJ78CHE3/52?
For technical support, including SMBJ78CHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CHE3/52 requirements.
6.How does Aetrix verify that SMBJ78CHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78CHE3/52 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 SMBJ78CHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78CHE3/52?
All SMBJ78CHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CHE3/52, 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 SMBJ78CHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ78CHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CHE3/52 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 …
