My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85CA-M3/5B
;;2.jpg)
- Part No.:
- SMBJ85CA-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA-M3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,225
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85CA-M3/5B from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 85 V stand-off voltage (VWM), 94.4–104 V breakdown voltage (VBR) at 1 mA, 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ85CA-M3/5B datasheet, SMBJ85CA-M3/5B pinout, SMBJ85CA-M3/5B application, or SMBJ85CA-M3/5B equivalent, key selection considerations include bidirectional surge clamping capability, low thermal resistance (RθJA = 100 °C/W), halogen-free RoHS-compliant construction (M3 suffix), and compatibility with automated SMT placement on 5.0 mm × 5.0 mm 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 fast response time (<1 ns), while the SMB package supports high surge current handling (IPPM = 4.4 A) under standardized 10/1000 µs waveform conditions.
The SMBJ85CA-M3/5B is rated for continuous operation from –55 °C to +150 °C junction temperature, with 5.0 W power dissipation at TA = 50 °C and meets MSL Level 1 per J-STD-020 (peak reflow ≤260 °C). It exhibits a typical temperature coefficient of VBR of 0.106 %/°C, ensuring predictable voltage drift across operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse working voltage before clamping initiates; defines safe operating margin for 72–85 V DC bus or signal lines. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Confirmed breakdown threshold range; ensures reliable turn-on above nominal system voltage. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs transient; limits downstream stress to <137 V under 600 W surge. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports repetitive surges at 0.01 % duty cycle. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs heatsinking requirements for sustained operation. |
| TJ max. | +150 °C - Maximum junction temperature; enables use in high-ambient industrial environments without derating below 125 °C ambient. |
| Package | SMB (DO-214AA) - Low-profile surface-mount outline (5.21 mm × 4.06 mm × 2.20 mm); compatible with JEDEC-standard SMT assembly and IPC-7351B footprints. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals function as interchangeable anode/cathode pair for AC or dual-polarity DC protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Terminal 1 | Anode/Cathode (bidirectional) | Interchangeable terminal; connects to protected line (e.g., CAN_H or RS-485 A); no cathode band marking. |
| Terminal 2 | Anode/Cathode (bidirectional) | Interchangeable terminal; connects to reference plane (GND or complementary line); identical electrical role to Terminal 1. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables single-device protection of AC-coupled or differential signal lines (e.g., RS-485, CAN, Ethernet PHY) without polarity concerns. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV line-earth) when mounted on 5.0 mm × 5.0 mm copper pads per datasheet Fig. 2. |
| Halogen-free & RoHS-compliant (M3) | Meets environmental compliance for automotive and industrial end-equipment without compromising surge robustness or solderability. |
| MSL Level 1 rating | Allows unlimited floor life and single-reflow processing at peak 260 °C - eliminates baking requirements prior to assembly. |
| Low incremental surge resistance | Minimizes VC overshoot during fast-rising transients (<1 ns response), improving protection margin for sensitive 3.3 V or 5 V logic interfaces. |
Applications
| Industrial Power Input Protection | Automotive Sensor Interface Protection |
|---|---|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to load dump and inductive switching noise. IC Role / Device Role / Timing Role: Bidirectional TVS clamping element placed across input terminals to limit transient excursions to ≤137 V. Use Value: Prevents damage to upstream DC-DC controller and downstream microcontroller I/O by clamping 600 W surges within safe VC envelope. |
Use Scenario: LIN bus or analog sensor signal line (e.g., pressure transducer) in engine control unit subject to ESD and coupled transients. IC Role / Device Role / Timing Role: Line-to-ground transient suppressor with sub-1 ns response, placed adjacent to connector entry point. Use Value: Maintains signal integrity below 137 V clamp level while surviving >10,000 ESD events per AEC-Q101 qualification (HM3 variant). |
| RS-485 Data Line Protection | AC/DC Adapter Output Stage |
Use Scenario: Differential pair (A/B) of industrial RS-485 transceiver subjected to lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Bidirectional TVS connected between A–GND and B–GND to clamp mode-specific overvoltage. Use Value: Enables compliance with IEC 61000-4-4 (EFT) and IEC 61000-4-5 (surge) without adding series impedance or signal distortion. |
Use Scenario: Secondary-side 12 V output of isolated AC/DC adapter driving motor drivers and logic circuits. IC Role / Device Role / Timing Role: Output rail clamp suppressing flyback spikes from relay coils or capacitive loads. Use Value: Limits output overvoltage to 137 V during 100 µs–1 ms transients, protecting downstream 12 V-rated regulators and gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-E3/5B | RoHS-compliant but not halogen-free; same electrical specs and SMB package. | Preferred for commercial-grade non-automotive designs where halogen content is unrestricted. | Select when cost sensitivity outweighs halogen-free requirement and AEC-Q101 is unnecessary. |
| SMBJ85CAHM3_B/I | AEC-Q101 qualified, halogen-free, 13" tape-and-reel (3200 pcs); identical VWM, VBR, VC, PPPM. | Required for automotive ECUs and safety-critical modules needing automotive qualification. | Choose for Tier-1 automotive programs requiring documented AEC-Q101 test reports and traceable lot data. |
Compared with SMBJ85CA-M3/5B, the E3/5B variant offers identical protection performance at lower material cost but lacks halogen-free certification, while the HM3_B/I version adds AEC-Q101 qualification and larger reel quantity - making it suitable for automotive production but less optimal for rapid prototyping or low-volume industrial builds.
Availability
SMBJ85CA-M3/5B is available at Aetrix Electronics and suitable for industrial power input protection, RS-485 interface hardening, and automotive sensor interface designs requiring stable component supply, halogen-free compliance, and SMT-ready packaging.
Supply support for SMBJ85CA-M3/5B 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, power efficiency, and application-specific optimization.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and telecom infrastructure where 600 W surge immunity and MSL Level 1 assembly compatibility are mandatory.
FAQ
What is the maximum clamping voltage of the SMBJ85CA-M3/5B under a 10/1000 µs surge?
The SMBJ85CA-M3/5B has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current with a 10/1000 µs waveform, as specified in the Vishay datasheet Document Number 88392. This value defines the upper voltage limit imposed on protected circuitry during standardized surge events and is measured under defined test conditions using 0.2" × 0.2" copper pads. The SMBJ85CA-M3/5B maintains this clamping performance across its full operating temperature range.
Is SMBJ85CA-M3/5B suitable for automotive applications?
The SMBJ85CA-M3/5B is halogen-free and RoHS-compliant but not AEC-Q101 qualified. For automotive applications requiring formal qualification, Vishay offers the SMBJ85CAHM3_B/I variant. The SMBJ85CA-M3/5B remains appropriate for non-safety-critical automotive subsystems such as infotainment power rails or body electronics where AEC-Q101 is not mandated - provided system-level validation confirms robustness. Always verify against OEM-specific stress test requirements before final design-in of SMBJ85CA-M3/5B.
How does the bidirectional nature of SMBJ85CA-M3/5B affect PCB layout?
The SMBJ85CA-M3/5B has no polarity marking and functions identically in both directions, simplifying PCB layout by eliminating orientation constraints during placement. This allows direct integration into AC-coupled paths or differential signal pairs (e.g., CAN, RS-485) without concern for anode/cathode alignment. Layout best practices still require symmetric trace routing and minimum-length connections to GND or reference planes to preserve low-inductance surge current paths - critical for maintaining the SMBJ85CA-M3/5B's sub-1 ns response and 137 V clamping performance.
What is the thermal resistance of SMBJ85CA-M3/5B, and how does it impact power derating?
The SMBJ85CA-M3/5B 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 governs power derating above 25 °C ambient: for example, at 70 °C ambient, the allowable continuous power dissipation drops to approximately 2.5 W. Derating curves in Figure 2 of the Vishay datasheet show linear reduction of peak pulse power above TA = 25 °C - essential for thermal design validation of SMBJ85CA-M3/5B in enclosed industrial enclosures.
Can SMBJ85CA-M3/5B replace unidirectional TVS diodes like SMBJ85A-M3/5B in existing designs?
No - SMBJ85CA-M3/5B is strictly bidirectional and cannot substitute for unidirectional types like SMBJ85A-M3/5B in DC-biased applications where reverse leakage or forward conduction must be avoided. In a 24 V DC rail, for instance, SMBJ85A-M3/5B blocks reverse current up to 85 V, whereas SMBJ85CA-M3/5B conducts in both directions above VBR. Substitution requires verifying that the protected circuit tolerates bidirectional conduction and that clamping symmetry aligns with transient polarity expectations. Always validate functionality with actual surge testing before replacing SMBJ85A-M3/5B with SMBJ85CA-M3/5B.
SMBJ85CA-M3/5B 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMBJ85CA-M3/5B FAQ
1.How can I place an order for SMBJ85CA-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA-M3/5B 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 SMBJ85CA-M3/5B reliable?
The price and inventory of SMBJ85CA-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CA-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85CA-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA-M3/5B?
SMBJ85CA-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA-M3/5B 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 SMBJ85CA-M3/5B?
For technical support, including SMBJ85CA-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA-M3/5B requirements.
6.How does Aetrix verify that SMBJ85CA-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA-M3/5B 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 SMBJ85CA-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85CA-M3/5B?
All SMBJ85CA-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA-M3/5B, 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 SMBJ85CA-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ85CA-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CA-M3/5B 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 …
