My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85A-M3/5B
;;2.jpg)
- Part No.:
- SMBJ85A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85A-M3/5B.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,853
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85A-M3/5B from Vishay General Semiconductor is a unidirectional 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 (IPPM), and 600 W peak pulse power (10/1000 μs waveform), commonly deployed to protect MOSFETs and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ85A-M3/5B datasheet, SMBJ85A-M3/5B pinout, SMBJ85A-M3/5B application, or SMBJ85A-M3/5B equivalent, key selection criteria include unidirectional polarity, 1.0 μA max reverse leakage at VWM, M3 halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a clamping device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold (VBR), limiting transient energy by diverting surge current away from protected circuitry. Its low incremental surge resistance and fast response time (<1 ns) ensure effective suppression of ESD and inductive switching spikes.
The SMBJ85A-M3/5B is rated for 150 °C maximum junction temperature, exhibits a +0.106 %/°C temperature coefficient of VBR, and is qualified to MSL level 1 per J-STD-020 with 260 °C reflow peak. It is not AEC-Q101 qualified - only HE3/HM3 variants carry automotive qualification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 94.4 V / 104 V at IT = 1 mA - defines guaranteed avalanche onset range under standardized test conditions |
| VC @ IPPM | 137 V at 4.4 A - clamped voltage during 10/1000 μs surge, determining worst-case stress on downstream ICs |
| PPPM | 600 W - peak transient power handling capability with standard 10/1000 μs waveform |
| ID @ VWM | 1.0 μA max - ensures minimal standby power loss and signal integrity in high-impedance circuits |
| Package | SMB (DO-214AA) - 0.220" × 0.155" footprint compatible with IPC-7351B standard land pattern |
| Polarity | Unidirectional - cathode marked by band; blocks forward current above ~3.5 V, clamps reverse surges |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant (M3 suffix), matte tin-plated leads, MSL Level 1, 260 °C reflow peak.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage rail; forms current path during reverse-biased clamping |
| Cathode | High-side transient input terminal | Connected to protected line (e.g., 85 V supply rail); band-marked end accepts positive surge relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 μs) | Enables robust protection against IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 85 V DC rails |
| 137 V clamping voltage at 4.4 A | Limits voltage overshoot to safe margin below 150 V-rated component thresholds |
| 1.0 μA max reverse leakage at 85 V | Preserves efficiency and noise floor in always-on industrial monitoring circuits |
| MSL Level 1, 260 °C reflow compatible | Supports single-pass lead-free assembly without moisture-related popcorn failure |
| Glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
Applications
| Industrial Motor Drive Power Stage | Automated Test Equipment (ATE) Signal Conditioning |
|---|---|
Use Scenario: Protection of gate drivers and bootstrap FETs against inductive kickback from 80–90 V DC bus switching. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed across DC bus and ground near power stage. Use Value: Limits transient voltage to ≤137 V, preventing gate oxide rupture in 100 V-rated Si MOSFETs during 100 A turn-off events. |
Use Scenario: Guarding analog front-end inputs (e.g., ±10 V DAC outputs) from ESD and relay contact bounce. IC Role / Device Role / Timing Role: Standby clamping diode connected between signal line and local ground plane. Use Value: Sub-1 ns response captures fast transients before op-amp input stages saturate or latch up. |
| Telecom Remote Radio Unit (RRU) Power Input | Factory Automation PLC Digital Input Module |
Use Scenario: Safeguarding 85 V nominal -48 V telecom power feed converters from lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary-level TVS on DC input rail upstream of DC/DC converter. Use Value: Withstands repeated 600 W pulses at 0.01% duty cycle, supporting long-term field reliability in harsh environments. |
Use Scenario: Protecting 24 V digital input optocouplers from back-EMF when interfacing with solenoid valves. IC Role / Device Role / Timing Role: Line-to-ground TVS on each isolated input channel. Use Value: 1.0 μA leakage avoids false triggering of high-impedance current-sense comparators at 24 V logic thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-E3/5B | Same electrical specs; RoHS-compliant but contains brominated flame retardants (non-halogen-free) | Acceptable for commercial-grade non-automotive designs where halogen-free compliance is not mandated | Select SMBJ85A-E3/5B if halogen-free certification is not required and cost optimization is prioritized. |
| SMBJ85AHM3_B/I | Identical specs plus AEC-Q101 qualification; HM3 suffix denotes halogen-free + automotive grade | Required for automotive body control modules or ADAS power supplies subject to AEC-Q101 stress testing | Choose SMBJ85AHM3_B/I only when automotive qualification and full traceability are contractually enforced. |
Compared with SMBJ85A-M3/5B, the E3 variant trades halogen-free status for lower cost in commercial systems, while the HM3 variant adds AEC-Q101 validation for automotive use - neither offers pin-to-pin or functional differentiation beyond compliance scope.
Availability
SMBJ85A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, telecom remote radio units, factory automation PLCs, and automated test equipment requiring stable component supply and halogen-free compliance.
Supply support for SMBJ85A-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 rugged packaging.
The SMBJ series targets board-level transient suppression in industrial, telecom, and computing systems, delivering standardized 600 W surge immunity in compact SMB packages optimized for high-volume SMT manufacturing.
FAQ
What is the maximum clamping voltage of SMBJ85A-M3/5B under a 10/1000 μs surge?
The SMBJ85A-M3/5B has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the standard 10/1000 μs waveform. This value is measured per JEDEC test conditions and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ85A-M3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ85A-M3/5B suitable for automotive applications?
No, SMBJ85A-M3/5B is not AEC-Q101 qualified. It carries the M3 halogen-free RoHS-compliant designation for commercial-grade use only. For automotive applications, Vishay specifies the SMBJ85AHM3_B/I variant, which includes full AEC-Q101 qualification, extended traceability, and additional stress testing. The SMBJ85A-M3/5B must not be used in safety-critical or automotive-qualified designs without formal validation.
What does the "M3" suffix indicate in SMBJ85A-M3/5B?
The "M3" suffix in SMBJ85A-M3/5B denotes halogen-free, RoHS-compliant construction meeting IEC 61249-2-21 requirements, with matte tin-plated leads qualified to JESD 201 Class 2 whisker resistance. It distinguishes the part from E3 (RoHS-compliant but not halogen-free) and HM3 (halogen-free + AEC-Q101 qualified) variants. The SMBJ85A-M3/5B is intended for commercial and industrial applications where halogen-free compliance is mandated.
How is the polarity marked on SMBJ85A-M3/5B?
The SMBJ85A-M3/5B uses a cathode band marking on the SMB (DO-214AA) package to indicate polarity: the banded end is the cathode, and the unmarked end is the anode. This unidirectional configuration allows forward conduction only when anode voltage exceeds cathode voltage by ~3.5 V, while providing reverse-biased avalanche clamping above 94.4 V. Correct orientation is critical - reversing SMBJ85A-M3/5B renders it ineffective for transient suppression.
What PCB pad layout is recommended for SMBJ85A-M3/5B?
Vishay specifies mounting SMBJ85A-M3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated thermal and surge performance. The SMB (DO-214AA) outline requires 0.155" (3.94 mm) minimum anode-to-cathode pad spacing and 0.086" (2.18 mm) pad width. Deviating from this layout reduces peak pulse power derating and may cause solder joint fatigue under repetitive surge stress. The SMBJ85A-M3/5B datasheet provides exact dimensional tolerances in inches and millimeters.
SMBJ85A-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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ85A-M3/5B FAQ
1.How can I place an order for SMBJ85A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85A-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 SMBJ85A-M3/5B reliable?
The price and inventory of SMBJ85A-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 SMBJ85A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85A-M3/5B?
SMBJ85A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85A-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 SMBJ85A-M3/5B?
For technical support, including SMBJ85A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85A-M3/5B requirements.
6.How does Aetrix verify that SMBJ85A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85A-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 SMBJ85A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85A-M3/5B?
All SMBJ85A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85A-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 SMBJ85A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ85A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85A-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 …
