My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ78CA-E3/52
;;2.jpg)
- Part No.:
- SMBJ78CA-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CA-E3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,759
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ78CA-E3/52 from Vishay General Semiconductor is a bidirectional transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features a 78 V standoff voltage (VWM), 86.7–95.8 V breakdown voltage (VBR) at 1 mA, 126 V maximum clamping voltage (VC) at 4.8 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives.
For engineers reviewing the SMBJ78CA-E3/52 datasheet, SMBJ78CA-E3/52 pinout, SMBJ78CA-E3/52 application, or SMBJ78CA-E3/52 equivalent, key selection criteria include bidirectional clamping symmetry, low thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification eligibility, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This bidirectional TVS operates symmetrically in both polarities, delivering identical clamping performance regardless of transient polarity - critical for protecting AC-coupled interfaces and floating sensor bridges. Its glass-passivated junction ensures stable leakage (<1.0 µA at VWM) and fast response time (<1.0 ps), while the low incremental surge resistance minimizes voltage overshoot during ESD or lightning-induced surges.
The device is rated for repetitive 600 W pulses at 0.01% duty cycle and derates linearly above 25 °C ambient per Fig. 2; maximum junction temperature is 150 °C, and thermal resistance from junction-to-lead is 20 °C/W - enabling reliable operation under sustained surge conditions when mounted per recommended pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - maximum continuous reverse operating voltage before significant conduction begins; defines safe working margin below clamping threshold |
| VBR (min/max) | 86.7 V / 95.8 V at 1 mA - guaranteed breakdown range ensures predictable turn-on across manufacturing lot and temperature |
| VC @ IPPM | 126 V at 4.8 A - clamping voltage limits downstream IC stress during 10/1000 µs transients; enables design margin vs. 100 V rail systems |
| PPPM | 600 W - peak pulse power handling capability with standard 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 surge immunity |
| IPPM | 4.8 A - peak pulse current corresponding to VC; derived from PPPM/VC, confirming energy absorption capacity |
| TJ max. | 150 °C - maximum junction temperature; allows operation in high-ambient industrial enclosures without forced cooling |
| RθJA | 100 °C/W - thermal resistance to ambient on standard 0.2" × 0.2" copper pads; informs board-level thermal design and power derating |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads compliant with J-STD-002 and JESD 22-B102; meets UL 94 V-0 flammability rating and MSL level 1 (peak reflow 260 °C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal in forward bias; common node for bidirectional conduction path | No polarity marking on SMBJ78CA-E3/52 - symmetrical terminals enable orientation-agnostic PCB placement |
| Cathode | Current exit terminal in forward bias; electrically identical to Anode in bidirectional configuration | Terminal equivalence eliminates need for silkscreen polarity indicators; simplifies layout and assembly verification |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Identical VBR and VC in both directions - protects AC signals, differential buses, and ungrounded sensor outputs without polarity constraints |
| 600 W peak pulse power | Withstands IEC 61000-4-5 combination wave surges up to 4 kV (open-circuit)/2 kA (short-circuit) when properly decoupled |
| Glass-passivated junction | Ensures stable leakage current (<1.0 µA at VWM) and long-term reliability under thermal cycling and humidity exposure |
| Automated placement compatible | Low-profile SMB package with standardized lead geometry supports high-yield pick-and-place at >30,000 UPH |
| AEC-Q101 qualification path | E3 suffix indicates RoHS-compliant commercial grade; HE3 variant available for automotive-grade designs requiring stress-tested reliability |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate driver supply rails against inductive kickback from 24 V DC solenoids and relay coils. IC Role / Device Role / Timing Role: Bidirectional voltage clamp limiting transient excursions to ≤126 V during switch-off events. Use Value: Prevents latch-up or oxide rupture in half-bridge drivers by holding rail voltage within 20% of 100 V-rated MOSFET VDSS. |
Use Scenario: Shielding LIN bus transceivers from load dump and jump-start induced transients in door module ECUs. IC Role / Device Role / Timing Role: Fast-response shunt element that activates within <1 ns to divert surge energy away from PHY layer. Use Value: Maintains signal integrity during 12 V system surges up to 35 V/100 ms and 400 V/50 µs spikes per ISO 7637-2 Pulse 5a. |
| Telecom Power Feeds | Industrial Sensor Signal Conditioning |
|
Use Scenario: Overvoltage suppression on -48 V DC telecom power distribution boards exposed to lightning-induced ground potential rise. IC Role / Device Role / Timing Role: Primary front-end protector absorbing multi-kW surge energy before upstream fusing. Use Value: Limits voltage excursion to 126 V during 10/1000 µs surges, preserving downstream DC/DC converter input stage integrity. |
Use Scenario: Guarding 4–20 mA current loop inputs in PLC analog input modules against field wiring faults and ESD. IC Role / Device Role / Timing Role: Low-capacitance (typ. 100 pF at 0 V) bidirectional clamp placed directly at connector interface. Use Value: Clamps transients to <130 V while adding <0.5% gain error at 20 mA - meets IEC 61000-4-2 Level 4 (15 kV air/8 kV contact) immunity. |
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-M3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and SMB package | Required for halogen-free BOM compliance in EU medical and industrial equipment | Select when regulatory compliance mandates halogen-free materials without altering circuit protection behavior |
| SMCJ78CA-E3 | Same VWM/VC but in larger SMC (DO-214AB) package; 1500 W PPPM, lower RθJA (50 °C/W) | Used where higher surge energy absorption or improved thermal dissipation is needed | Choose for enhanced ruggedness in high-reliability power supplies where board space permits larger footprint |
Compared with SMBJ78CA-E3/52, the M3/52 offers identical protection performance with halogen-free construction, while the SMCJ78CA-E3 provides 2.5× higher surge power handling and better thermal management - making it suitable for mission-critical 48 V telecom or railway applications where single-event energy exceeds 600 W limits.
Availability
SMBJ78CA-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and industrial sensor signal conditioning requiring stable component supply and full traceability.
Supply support for SMBJ78CA-E3/52 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, rectifiers, MOSFETs, and protection devices with emphasis on reliability, precision, and application-specific optimization.
The SMBJ series delivers standardized TVS performance in compact SMB packages for cost-sensitive, high-volume industrial and automotive protection - balancing surge robustness, thermal efficiency, and SMT manufacturability.
FAQ
What is the maximum clamping voltage of SMBJ78CA-E3/52 at its rated peak pulse current?
The SMBJ78CA-E3/52 has a maximum clamping voltage (VC) of 126 V at its specified peak pulse current (IPPM) of 4.8 A, measured under the standard 10/1000 µs waveform. This value is guaranteed across temperature and manufacturing lot, ensuring consistent overvoltage limiting for downstream components. The SMBJ78CA-E3/52 achieves this with low incremental surge resistance, minimizing voltage overshoot during fast-rising transients.
Is SMBJ78CA-E3/52 suitable for automotive applications?
SMBJ78CA-E3/52 itself is RoHS-compliant commercial-grade; however, Vishay offers the AEC-Q101 qualified variant SMBJ78CAHE3_B/H for automotive use. The SMBJ78CA-E3/52 shares identical electrical characteristics and SMB package with the HE3 version but lacks the extended stress testing required for under-hood deployment. For non-critical cabin modules or prototyping, SMBJ78CA-E3/52 may be used - but final automotive designs must specify the HE3 or HM3 suffix.
How does the bidirectional nature of SMBJ78CA-E3/52 affect its PCB layout?
The SMBJ78CA-E3/52 has no polarity marking and identical electrical behavior in both directions, allowing unrestricted orientation during placement - eliminating silkscreen polarity indicators and reducing assembly errors. Its symmetrical terminals simplify routing on dense boards, especially for differential signal lines or AC-coupled interfaces where traditional unidirectional TVS diodes would require careful anode/cathode alignment. This feature directly reduces layout complexity and improves first-pass yield for SMBJ78CA-E3/52 implementations.
What is the thermal resistance of SMBJ78CA-E3/52, and how does it impact board design?
The SMBJ78CA-E3/52 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 and dictates derating curves above 25 °C ambient. To maintain safe junction temperatures under repeated surges, designers must ensure adequate copper area and avoid thermal isolation - the SMBJ78CA-E3/52 relies on PCB copper for heat spreading rather than internal heatsinking.
Can SMBJ78CA-E3/52 replace a unidirectional TVS like SMBJ78A-E3/52 in existing designs?
No - SMBJ78CA-E3/52 is strictly bidirectional and cannot substitute for unidirectional SMBJ78A-E3/52 in DC-biased circuits such as power supply inputs or single-ended digital lines, where forward conduction must be blocked. While both share VWM = 78 V and similar VC, the unidirectional part conducts only in reverse bias and blocks forward current, whereas SMBJ78CA-E3/52 conducts symmetrically. Replacing SMBJ78A-E3/52 with SMBJ78CA-E3/52 risks unintended forward conduction and system malfunction unless the circuit topology explicitly supports bidirectional clamping.
SMBJ78CA-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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 (SMBJ)
SMBJ78CA-E3/52 FAQ
1.How can I place an order for SMBJ78CA-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CA-E3/52 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 SMBJ78CA-E3/52 reliable?
The price and inventory of SMBJ78CA-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CA-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78CA-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CA-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CA-E3/52?
SMBJ78CA-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CA-E3/52 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 SMBJ78CA-E3/52?
For technical support, including SMBJ78CA-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CA-E3/52 requirements.
6.How does Aetrix verify that SMBJ78CA-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78CA-E3/52 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 SMBJ78CA-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78CA-E3/52?
All SMBJ78CA-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CA-E3/52, 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 SMBJ78CA-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ78CA-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CA-E3/52 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 …
