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Vishay General Semiconductor - Diodes Division SMBJ78CA-M3/52
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- Part No.:
- SMBJ78CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ78CA-M3/52.pdf
- Description:
- TVS DIODE 78VWM 126VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,907
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Product details
Overview
SMBJ78CA-M3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on signal or power lines. It features a 78 V stand-off 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform). It is used to protect MOSFETs, ICs, and sensor signal lines in industrial power supplies and telecom interfaces.
For engineers reviewing the SMBJ78CA-M3/52 datasheet, SMBJ78CA-M3/52 pinout, SMBJ78CA-M3/52 application, or SMBJ78CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, 126 V VC under 4.8 A surge, halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical avalanche behavior in both directions, 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 VWM), while its low incremental surge resistance supports fast energy dissipation during ESD or lightning-induced surges.
The SMBJ78CA-M3/52 is rated for 150 °C maximum junction temperature and exhibits a typical thermal resistance of 100 °C/W (junction-to-ambient) on standard PCB pads. Its 0.01% duty cycle rating and derating curve (Fig. 2) define safe repetitive surge operation across ambient temperatures up to +125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 78 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC or AC RMS working limit. |
| VBR min/max | 86.7 V / 95.8 V at IT = 1 mA - Confirmed breakdown range ensuring reliable turn-on within spec across production lot. |
| VC @ IPPM | 126 V at 4.8 A - Clamping voltage under standardized 10/1000 µs surge; determines protected circuit's maximum transient exposure. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; defines single-event surge robustness. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at stand-off voltage; critical for low-power sensor or battery-backed circuits. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient industrial environments with proper layout. |
| Package | SMB (DO-214AA) - Surface-mount outline with 0.205" × 0.130" footprint; compatible with IPC-7351B standard land patterns. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, MSL Level 1 (JEDEC J-STD-020), 260 °C reflow peak. Bidirectional construction means no polarity marking; both terminals are electrically symmetric.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Transient conduction path | Both terminals function identically; voltage clamping occurs when |Vterminals| exceeds VBR in either direction. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or floating signal lines without polarity concerns. |
| 600 W peak pulse power (10/1000 µs) | Withstands IEC 61000-4-5 Level 4 surge events (4 kV line-earth) when properly mounted on 5 mm × 5 mm copper pads. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and telecom equipment without compromising surge performance. |
| Low clamping ratio (VC/VBR ≈ 1.34) | Minimizes overvoltage stress on downstream components compared to higher-ratio TVS devices. |
| Fast response time (<1 ps) | Clamps transients before sensitive logic or analog circuitry sustains damage, per ANSI/IEEE C62.35 standards. |
Applications
| Industrial Motor Drive Control | Telecom Line Interface Protection |
|---|---|
|
Use Scenario: Protecting gate drivers and feedback sensing lines from inductive kickback during IGBT/MOSFET switching in variable-frequency drives. IC Role / Device Role / Timing Role: Voltage clamping element placed across gate-source or supply rails to limit transient excursions below MOSFET VGS,max or IC absolute maximum ratings. Use Value: Prevents cumulative gate oxide degradation and latch-up by limiting transient peaks to ≤126 V during 4.8 A surges. |
Use Scenario: Shielding RS-485 transceivers and PHY layer components from induced surges on long-haul data lines exposed to lightning or EFT. IC Role / Device Role / Timing Role: Primary front-end transient suppressor on differential bus lines, operating bidirectionally to clamp both polarities of common-mode surges. Use Value: Maintains signal integrity by clamping transients within 126 V while adding <1 pF junction capacitance at zero bias (per Fig. 4). |
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|
Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against load dump and ISO 7637-2 pulse 5a/b in 12 V systems. IC Role / Device Role / Timing Role: Secondary-level TVS placed after primary fusing, providing fast-response clamping for sub-100 ns transients. Use Value: Complies with AEC-Q101 qualification when ordered as HM3 variant; this M3 version shares identical electrical specs for non-automotive use. |
Use Scenario: Protecting analog outputs (e.g., 4–20 mA loops) and ADC inputs of pressure/temperature sensors in factory automation PLCs. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) clamping device placed directly at connector entry point to shunt surge energy before conditioning amplifiers. Use Value: Ensures measurement accuracy remains unaffected during normal operation due to minimal reverse leakage at 78 V stand-off. |
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-E3/52 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (not halogen-free). | Acceptable where halogen-free requirement is not mandated (e.g., non-EU commercial equipment). | Select E3 if cost sensitivity outweighs halogen-free compliance; M3 required for strict environmental programs. |
| SMAJ78CA-M3 | Lower PPPM (400 W vs. 600 W); same VWM/VBR/VC; SMA package (smaller footprint, higher RθJA). | Less robust for high-energy surges; suitable only where space constraints preclude SMB size. | Choose SMAJ78CA-M3 only when board area is critical and surge threat level is reduced (e.g., secondary-side protection). |
Compared with SMBJ78CA-E3/52 and SMAJ78CA-M3, the SMBJ78CA-M3/52 delivers superior surge energy handling in a halogen-free package, making it optimal for industrial power interfaces where both environmental compliance and 600 W pulse robustness are mandatory.
Availability
SMBJ78CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interfaces, and sensor signal conditioning requiring stable component supply with halogen-free compliance and 600 W surge immunity.
Supply support for SMBJ78CA-M3/52 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, and protection devices with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-energy transient suppression in harsh environments, targeting industrial, telecom, and automotive subsystems where consistent clamping voltage and repeatable surge endurance are critical.
FAQ
What is the clamping voltage of SMBJ78CA-M3/52 under a 10/1000 µs surge?
The SMBJ78CA-M3/52 has a maximum clamping voltage (VC) of 126 V at 4.8 A peak pulse current (IPPM), measured using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ78CA-M3/52 maintains this clamping performance due to its low incremental surge resistance and symmetrical bidirectional structure.
Is SMBJ78CA-M3/52 suitable for automotive applications?
The SMBJ78CA-M3/52 itself is not AEC-Q101 qualified; it carries the M3 suffix indicating halogen-free RoHS compliance for commercial-grade use. For automotive applications, Vishay offers the HM3 variant (e.g., SMBJ78CA-HM3/_X), which adds AEC-Q101 qualification while retaining identical electrical parameters. Engineers must specify the HM3 ordering code-not M3-to meet automotive reliability requirements. The SMBJ78CA-M3/52 remains appropriate for industrial and telecom designs where AEC-Q101 is not mandated.
How does the bidirectional design of SMBJ78CA-M3/52 affect PCB layout?
The SMBJ78CA-M3/52 has no polarity marking and functions identically in both directions, eliminating orientation constraints during automated placement. This simplifies PCB layout-no silkscreen polarity indicator is needed, and routing symmetry is not required. However, thermal performance depends on mounting: the device must be placed on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve specified 600 W pulse rating and thermal resistance. The SMBJ78CA-M3/52's DO-214AA outline requires adherence to IPC-7351B SMB land pattern dimensions for reliable solder joints.
What is the maximum reverse leakage current for SMBJ78CA-M3/52 at its stand-off voltage?
The SMBJ78CA-M3/52 exhibits a maximum reverse leakage current (ID) of 1.0 µA at its 78 V stand-off voltage (VWM), tested at TA = 25 °C. This low leakage ensures minimal power loss and signal distortion in high-impedance circuits such as sensor bias networks or battery-operated monitoring systems. Leakage remains within specification up to +125 °C ambient, though it increases exponentially near TJ max (150 °C); system designers should verify worst-case leakage in thermally constrained layouts. The SMBJ78CA-M3/52 achieves this performance via glass-passivated junction technology.
Can SMBJ78CA-M3/52 replace SMBJ78A-M3/52 in a design?
No-SMBJ78CA-M3/52 and SMBJ78A-M3/52 are not interchangeable. The "CA" suffix denotes bidirectional operation, while "A" indicates unidirectional. SMBJ78A-M3/52 has a cathode band and conducts only in reverse bias; substituting it for SMBJ78CA-M3/52 would leave positive transients unprotected. Conversely, using SMBJ78CA-M3/52 in place of SMBJ78A-M3/52 may cause unintended conduction in DC-biased lines. Always match the suffix: CA for AC/floating lines, A for DC/unidirectional rails. The SMBJ78CA-M3/52 is strictly intended for bidirectional protection scenarios.
SMBJ78CA-M3/52 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-M3/52 FAQ
1.How can I place an order for SMBJ78CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ78CA-M3/52 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-M3/52 reliable?
The price and inventory of SMBJ78CA-M3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ78CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ78CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ78CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ78CA-M3/52?
SMBJ78CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ78CA-M3/52 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-M3/52?
For technical support, including SMBJ78CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ78CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ78CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ78CA-M3/52 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-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ78CA-M3/52?
All SMBJ78CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ78CA-M3/52, 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-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ78CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ78CA-M3/52 Tags
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