My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85CA-M3/52
;;2.jpg)
- Part No.:
- SMBJ85CA-M3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA-M3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85CA-M3/52 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-M3/52 datasheet, SMBJ85CA-M3/52 pinout, SMBJ85CA-M3/52 application, or SMBJ85CA-M3/52 equivalent, key selection criteria include bidirectional clamping capability, low clamping ratio (VC/VBR ≈ 1.38), 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-clamped surge protector with symmetrical avalanche behavior in both polarities, enabling protection of AC-coupled or floating signal paths without polarity constraints. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), while the 100 °C/W junction-to-ambient thermal resistance supports operation up to +150 °C junction temperature under defined PCB layout conditions.
The SMBJ85CA-M3/52 delivers repeatable transient suppression with a 0.01 % duty cycle limit for 10/1000 µs pulses and exhibits a temperature coefficient of VBR of +0.106 %/°C - critical for maintaining clamping accuracy across automotive and industrial ambient ranges. It meets MSL Level 1 per J-STD-020 and is rated for 260 °C lead-free reflow peak temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage; defines safe operating margin below clamping threshold |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - guaranteed avalanche initiation range; ensures predictable turn-on during overvoltage events |
| VC @ IPPM | 137 V at 4.4 A - clamped voltage seen by protected circuit during 600 W transient; determines maximum stress on downstream components |
| PPPM | 600 W - peak pulse power handling with 10/1000 µs waveform; defines transient energy absorption capacity |
| IPPM | 4.4 A - peak pulse current corresponding to VC; used to size series impedance and verify PCB trace survival |
| TJ max. | +150 °C - maximum junction temperature; sets thermal derating boundary for sustained surge repetition |
| Package | SMB (DO-214AA) - standardized 2-pin surface-mount outline with 5.59 mm length, 4.06 mm width, and 2.20 mm height; compatible with JEDEC MS-012 |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration with no polarity marking - terminals are electrically symmetrical and interchangeable. Device is mounted with cathode/anode leads soldered to PCB pads; no band or marking distinguishes polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current entry (negative half-cycle) | Accepts reverse surge current during negative voltage excursions; forms one side of symmetrical clamping path |
| Cathode | Transient current entry (positive half-cycle) | Accepts reverse surge current during positive voltage excursions; completes bidirectional clamping loop with anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping | Enables protection of AC signals, differential buses, or ungrounded circuits without polarity constraints |
| 600 W peak pulse power (10/1000 µs) | Supports robust immunity against IEC 61000-4-5 Level 4 surges (4 kV line-earth) when combined with appropriate series impedance |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for industrial and consumer electronics without compromising surge performance |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; simplifies manufacturing logistics |
| Low clamping ratio (VC/VBR ≈ 1.38) | Minimizes voltage overshoot during clamping, reducing stress on 100 V-rated MOSFETs and logic interfaces |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O lines against inductive kickback from relay coils and solenoid loads. IC Role / Device Role: Bidirectional TVS placed across relay coil or between MCU GPIO and external switch node. Use Value: Limits transient voltage to ≤137 V, preventing latch-up or oxide damage in 3.3 V/5 V MCUs and 100 V-rated MOSFET drivers. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role: Standoff-clamp TVS installed at connector interface to absorb coupled transients before reaching ASICs. Use Value: Withstands repetitive 10/1000 µs pulses up to 4.4 A while maintaining <1 µA leakage at 85 V, preserving bus integrity. |
| Telecom Power Feeds | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection for PoE-powered equipment and DSL line cards subjected to lightning-induced surges. IC Role / Device Role: Primary clamping device on DC input rail upstream of DC-DC converters and hot-swap controllers. Use Value: 600 W rating enables coordination with upstream fuses or PTCs to clear high-energy transients without degradation. |
Use Scenario: ESD and switching transient protection on touch panel interfaces and appliance display backlight control lines. IC Role / Device Role: Low-capacitance TVS placed directly at connector or flex cable entry point to shunt fast transients. Use Value: Symmetrical response ensures equal protection for rising/falling edge transients on bidirectional I²C or UART lines. |
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-E3/52 | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable where halogen-free requirement is not mandated (e.g., non-automotive commercial gear) | Select when cost sensitivity outweighs halogen-free compliance; identical footprint and assembly process |
| SAC85CA | Same VWM/VC, but lower PPPM (400 W); smaller SOD-123FL package (2.7 × 1.7 mm) | Better suited for space-constrained portable devices; insufficient for 600 W IEC 61000-4-5 Level 4 | Choose only if board area is critical and surge energy is limited to ≤400 W; not drop-in for high-power industrial use |
Compared with SMBJ85CA-E3/52, the SMBJ85CA-M3/52 adds halogen-free compliance without sacrificing surge rating; versus SAC85CA, it provides 50 % higher pulse power in a larger but thermally superior SMB package - making it preferred for industrial and automotive front-end protection where reliability and energy handling are prioritized.
Availability
SMBJ85CA-M3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, telecom power feeds, and consumer appliance control boards requiring stable component supply and long-term obsolescence management.
Supply support for SMBJ85CA-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, MOSFETs, and protection devices with emphasis on reliability, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting industrial automation, automotive subsystems, and infrastructure equipment where consistent clamping performance and AEC-Q101 qualification options are essential.
FAQ
What is the maximum clamping voltage of the SMBJ85CA-M3/52 under standard test conditions?
The SMBJ85CA-M3/52 has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current with a 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ85CA-M3/52 maintains this clamping performance across its full operating temperature range (-55 °C to +150 °C).
Does the SMBJ85CA-M3/52 require polarity-aware PCB layout?
No - the SMBJ85CA-M3/52 is a bidirectional TVS diode with symmetrical electrical characteristics in both directions, and it carries no polarity marking on the SMB (DO-214AA) package. PCB layout requires only two pads with no orientation dependency; either terminal may connect to line or return. The SMBJ85CA-M3/52 functions identically regardless of mounting direction.
Is the SMBJ85CA-M3/52 suitable for automotive applications?
The base SMBJ85CA-M3/52 is commercial-grade; however, Vishay offers AEC-Q101 qualified variants under ordering codes HM3_X (e.g., SMBJ85CAHM3_B/H). While the SMBJ85CA-M3/52 itself is not AEC-Q101 certified, its thermal and surge specifications align with many non-safety-critical automotive subsystems - always verify qualification status via the specific part number's datasheet before deployment.
What is the meaning of the "M3" suffix in SMBJ85CA-M3/52?
The "M3" suffix in SMBJ85CA-M3/52 indicates halogen-free, RoHS-compliant construction using bromine- and chlorine-free molding compounds and matte tin-plated leads. It satisfies IEC 61249-2-21 and IPC-4101D requirements for environmentally restricted substances, distinguishing it from the "E3" (RoHS-compliant but halogen-containing) variant. The SMBJ85CA-M3/52 retains identical electrical and thermal performance to E3 versions.
How does the SMBJ85CA-M3/52 compare to unidirectional TVS diodes like SMBJ85A-M3/52?
The SMBJ85CA-M3/52 differs from unidirectional SMBJ85A-M3/52 solely in polarity: "CA" denotes bidirectional operation (no cathode band, symmetrical V-I curve), while "A" denotes unidirectional (cathode band marked, conducts only in reverse bias). Both share identical VWM, VBR, VC, and PPPM ratings. Choose SMBJ85CA-M3/52 for AC, floating, or polarity-agnostic protection; choose SMBJ85A-M3/52 for DC rails with defined ground reference.
SMBJ85CA-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):
- 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-M3/52 FAQ
1.How can I place an order for SMBJ85CA-M3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA-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 SMBJ85CA-M3/52 reliable?
The price and inventory of SMBJ85CA-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 SMBJ85CA-M3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85CA-M3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA-M3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA-M3/52?
SMBJ85CA-M3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA-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 SMBJ85CA-M3/52?
For technical support, including SMBJ85CA-M3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA-M3/52 requirements.
6.How does Aetrix verify that SMBJ85CA-M3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA-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 SMBJ85CA-M3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85CA-M3/52?
All SMBJ85CA-M3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA-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 SMBJ85CA-M3/52 part is unused and in its original packaging.
Return procedure for SMBJ85CA-M3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CA-M3/52 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 …
