My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMCJ78CAHE3/57T
- Part No.:
- SMCJ78CAHE3/57T
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ78CAHE3/57T.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,684
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMCJ78CAHE3/57T from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMC (DO-214AB) package, designed for high-energy surge protection with 78 V standoff voltage (VWM), 1500 W peak pulse power (PPPM), and 126 V maximum clamping voltage (VC) at 11.9 A peak pulse current (IPPM). It protects sensitive ICs, MOSFETs, and sensor signal lines in automotive and industrial power electronics.
For engineers reviewing the SMCJ78CAHE3/57T datasheet, SMCJ78CAHE3/57T pinout, SMCJ78CAHE3/57T application, or SMCJ78CAHE3/57T equivalent, key selection criteria include bidirectional clamping capability, AEC-Q101 qualification, 1500 W surge rating, low thermal resistance (RθJL = 15 °C/W), and compatibility with automated SMT assembly on standard PCB pad layouts.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector triggered by transient overvoltage events - such as inductive load switching or ESD - across bidirectional signal or power lines. Its glass-passivated junction ensures stable breakdown behavior and fast response time (<1 ns), while the SMC package supports high surge current handling without degradation under repeated 10/1000 μs waveform stress.
The device is rated for -55 °C to +150 °C operating junction temperature, meets MSL Level 1 per J-STD-020, and features matte tin-plated leads compliant with J-STD-002 solderability standards. Its bidirectional symmetry eliminates polarity concerns in AC-coupled or differential bus protection applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse working voltage before clamping activation; defines safe operating margin for 72–84 V nominal systems. |
| VBR min / max | 86.7 V / 95.8 V - Breakdown voltage range at 1 mA test current; ensures reliable turn-on within defined tolerance band. |
| VC @ IPPM | 126 V - Clamping voltage at 11.9 A peak pulse current; limits downstream voltage stress during 1500 W transients. |
| PPPM | 1500 W - Peak pulse power handling per 10/1000 μs waveform; enables robust protection against IEC 61000-4-5 Level 4 surges. |
| ID @ VWM | 1.0 μA - Reverse leakage at 78 V; negligible power loss and minimal impact on high-impedance sensing circuits. |
| TJ max | +150 °C - Maximum junction temperature; supports operation in under-hood automotive environments and sealed industrial enclosures. |
| RθJL | 15 °C/W - Junction-to-lead thermal resistance; allows efficient heat transfer to PCB copper pads without external heatsinking. |
Pinout & Package
Package: SMC (DO-214AB), surface-mount, bidirectional configuration with no polarity marking. Case dimensions: 7.11 mm × 6.22 mm × 2.62 mm (L × W × H); terminals are matte tin-plated for lead-free reflow compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink (bidirectional) | Acts as cathode during positive transients and anode during negative transients; symmetric conduction path. |
| Cathode | Transient current sink (bidirectional) | Same electrical role as Anode due to bidirectional construction; no functional distinction in layout or routing. |
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. |
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift in harsh environments. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients, improving protection margin for 3.3 V/5 V logic interfaces. |
| MSL Level 1 rating | Enables unlimited floor life and standard reflow profiles up to 260 °C peak - compatible with high-volume SMT production. |
| UL 94 V-0 molding compound | Self-extinguishing encapsulation meets fire-safety requirements for industrial and transportation equipment. |
Applications
| Automotive Power Distribution | Industrial Sensor Signal Lines |
|---|---|
|
Use Scenario: Protection of 12 V/24 V power rails feeding ECUs, lighting modules, and actuators against load dump and alternator transients. IC Role / Device Role / Timing Role: Shunt-type transient suppressor placed at point-of-load to clamp voltage spikes before they reach downstream regulators and microcontrollers. Use Value: Withstands 1500 W surges and clamps to ≤126 V, preventing latch-up or permanent damage in AEC-Q100-compliant systems. |
Use Scenario: Guarding analog outputs and digital communication lines (e.g., CAN, LIN, RS-485) in pressure, temperature, and position sensors. IC Role / Device Role / Timing Role: Bidirectional clamping element across differential or single-ended signal pairs to suppress ESD and coupled noise. Use Value: 1.0 μA leakage at 78 V preserves signal integrity in high-impedance sensor bridges and ADC front-ends. |
| Telecom DC Power Feeds | Consumer Device USB/Type-C Ports |
|
Use Scenario: Surge suppression on -48 V telecom power supplies exposed to lightning-induced surges on long-line feeds. IC Role / Device Role / Timing Role: Primary overvoltage clamp on input stage of DC/DC converters and hot-swap controllers. Use Value: 126 V clamping voltage provides ≥20 V headroom above -48 V nominal, enabling compliance with GR-1089-CORE Level 3 requirements. |
Use Scenario: Secondary-level protection on VBUS and CC lines of USB Type-C ports in laptops, docking stations, and monitors. IC Role / Device Role / Timing Role: Fast-response TVS placed after primary fuse and upstream of port controller ICs. Use Value: Sub-nanosecond response and bidirectional symmetry protect both source and sink configurations without polarity constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ78CAHE3/52T | Lower PPPM (600 W), smaller SMB (DO-214AA) package, same VWM and VBR range. | Restricted to lower-energy transients; unsuitable for IEC 61000-4-5 Level 4 or automotive load dump. | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| SMCJ78AHE3/57T | Unidirectional version; identical VWM, VBR, PPPM, and package but requires correct polarity placement. | Not usable on AC-coupled or floating differential lines; adds design risk if polarity is misrouted. | Choose only when protecting DC-biased unidirectional lines (e.g., 5 V supply rail) and polarity control is guaranteed. |
Compared with SMBJ78CAHE3/52T and SMCJ78AHE3/57T, the SMCJ78CAHE3/57T uniquely delivers 1500 W bidirectional clamping in an AEC-Q101-qualified SMC package - making it the only option among the three suitable for full automotive load dump compliance and high-reliability industrial power rail protection.
Availability
SMCJ78CAHE3/57T is available at Aetrix Electronics and suitable for automotive power distribution, industrial sensor interface protection, telecom DC feed protection, and consumer USB Type-C port hardening requiring stable component supply and long-term lifecycle support.
Supply support for SMCJ78CAHE3/57T 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 application-specific optimization.
The SMCJ series is engineered for high-energy transient suppression in demanding environments - targeting automotive, industrial, and telecom infrastructure where robustness against repetitive surges and long-term stability are critical.
FAQ
What is the clamping voltage of the SMCJ78CAHE3/57T at its rated peak pulse current?
The SMCJ78CAHE3/57T has a maximum clamping voltage (VC) of 126 V at its rated peak pulse current (IPPM) of 11.9 A under a 10/1000 μs waveform. This value is measured per ANSI/IEEE C62.35 standards and defines the upper voltage limit imposed on protected circuitry during worst-case surge events. The SMCJ78CAHE3/57T maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Is the SMCJ78CAHE3/57T suitable for automotive applications?
Yes, the SMCJ78CAHE3/57T is AEC-Q101 qualified and explicitly designated for automotive use with ordering code suffix "HE3". It undergoes rigorous stress testing including temperature cycling, high-temperature reverse bias, and surge endurance - making it appropriate for engine control units, body electronics, ADAS sensors, and infotainment power supplies. The SMCJ78CAHE3/57T also meets MSL Level 1 for reflow compatibility in automotive manufacturing.
How does the bidirectional configuration of the SMCJ78CAHE3/57T affect PCB layout?
The SMCJ78CAHE3/57T has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement. Unlike unidirectional TVS diodes, the SMCJ78CAHE3/57T can be mounted across AC-coupled lines, differential buses (e.g., CAN, RS-485), or floating power domains without risk of reverse-bias failure. This simplifies layout, reduces BOM variants, and improves design reuse across signal and power domains.
What is the thermal resistance from junction to lead (RθJL) for the SMCJ78CAHE3/57T?
The SMCJ78CAHE3/57T has a typical junction-to-lead thermal resistance (RθJL) of 15 °C/W, measured under standard SMT mounting conditions. This low value enables efficient heat transfer from the silicon die directly into the PCB copper pads via the leads, supporting sustained power dissipation without external heatsinking. The SMCJ78CAHE3/57T achieves this while maintaining its 1500 W peak pulse rating and +150 °C maximum junction temperature specification.
Does the SMCJ78CAHE3/57T meet UL safety certification requirements?
Yes, the SMCJ78CAHE3/57T is Underwriters Laboratories (UL) recognized under file number E136766 for both unidirectional and bidirectional TVS devices, complying with UL 497B for signal line protectors. Its molding compound meets UL 94 V-0 flammability rating, and the device is rated for use in safety-critical circuits where fire resistance and electrical isolation integrity are mandated - including industrial control panels and telecom infrastructure equipment.
SMCJ78CAHE3/57T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AB, SMC
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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):
- 11.9A
- Power - Peak Pulse:
- 1500W (1.5kW)
- 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-214AB (SMCJ)
SMCJ78CAHE3/57T FAQ
1.How can I place an order for SMCJ78CAHE3/57T through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ78CAHE3/57T 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 SMCJ78CAHE3/57T reliable?
The price and inventory of SMCJ78CAHE3/57T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ78CAHE3/57T is usually 5 days.
3.What payment methods are accepted for SMCJ78CAHE3/57T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ78CAHE3/57T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ78CAHE3/57T?
SMCJ78CAHE3/57T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ78CAHE3/57T 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 SMCJ78CAHE3/57T?
For technical support, including SMCJ78CAHE3/57T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ78CAHE3/57T requirements.
6.How does Aetrix verify that SMCJ78CAHE3/57T is sourced from the original manufacturer or authorized distributors?
All SMCJ78CAHE3/57T 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 SMCJ78CAHE3/57T meets industry standards.
7.What is the process for return or replacement of SMCJ78CAHE3/57T?
All SMCJ78CAHE3/57T units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ78CAHE3/57T, 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 SMCJ78CAHE3/57T part is unused and in its original packaging.
Return procedure for SMCJ78CAHE3/57T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ78CAHE3/57T 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 …
