My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ8.5A-M3/5B
;;2.jpg)
- Part No.:
- SMBJ8.5A-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A-M3/5B.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,011
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ8.5A-M3/5B from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for clamping inductive switching transients and ESD events on power rails and signal lines. It features a 8.5 V stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 41.7 A peak pulse current, and 600 W peak pulse power rating with 10/1000 µs waveform - used to protect MOSFETs, microcontrollers, and sensor interfaces in industrial power supplies.
For engineers reviewing the SMBJ8.5A-M3/5B datasheet, SMBJ8.5A-M3/5B pinout, SMBJ8.5A-M3/5B application, or SMBJ8.5A-M3/5B equivalent, key selection criteria include unidirectional polarity, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature, halogen-free RoHS-compliant construction, and compatibility with automated SMT placement on PCBs with 5.0 mm × 5.0 mm copper pads per terminal.
Technical Context
This TVS diode operates as a voltage-clamping protection device that enters avalanche conduction when reverse voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, enabling precise overvoltage limiting during fast transients (response time < 1 ns).
The SMBJ8.5A-M3/5B is rated for 600 W peak pulse power under 10/1000 µs waveform with 0.01% duty cycle, and supports 100 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance is 100 °C/W (junction-to-ambient) and 20 °C/W (junction-to-lead), requiring appropriate PCB copper area for thermal management in sustained surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 8.5 V - Maximum continuous reverse working voltage before significant leakage; sets upper limit for normal circuit operation. |
| VBR (Breakdown Voltage) | 9.44–10.4 V at 1 mA - Confirmed avalanche onset range; defines minimum overvoltage triggering point. |
| VC (Clamping Voltage) | 14.4 V at 41.7 A - Peak voltage seen by protected circuit during 10/1000 µs surge; determines safe margin for downstream ICs. |
| IPPM (Peak Pulse Current) | 41.7 A - Maximum transient current the device can shunt without failure under standard 10/1000 µs waveform. |
| PPPM (Peak Pulse Power) | 600 W - Energy-handling capacity for short-duration surges; requires derating above 25 °C ambient. |
| ID (Max Reverse Leakage) | 1.0 µA at VWM - Minimal standby power loss and signal integrity impact in high-impedance circuits. |
| TJmax | +150 °C - Enables use in under-hood automotive modules and industrial motor drives with elevated ambient temperatures. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, matte tin-plated leads. Molding compound meets UL 94 V-0. Polarity indicated by cathode band; anode and cathode terminals are axially oriented along the body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Reverse-biased terminal during normal operation | Connected to higher-potential rail (e.g., VCC or signal line); conducts avalanche current to ground during overvoltage. |
| Anode | Reference/ground return path | Typically tied to system ground or low-side reference; completes clamping path during transient events. |
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 line-earth) without external series impedance. |
| Glass passivated chip junction | Ensures stable VBR over temperature and lifetime, with ±5% tolerance and minimal drift under repeated surge stress. |
| Low profile SMB package (DO-214AA) | 0.220" × 0.155" footprint fits dense PCB layouts; compatible with J-STD-020 reflow profiles up to 260 °C peak. |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets IPC-1752A material declaration requirements and automotive ELV directive; suitable for green manufacturing programs. |
| MSL Level 1 moisture sensitivity | Unlimited floor life at ≤30 °C / 60% RH; eliminates bake requirement prior to reflow soldering. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and MCU I/O pins from inductive kickback generated by relay and solenoid switching in PLC output stages. IC Role / Device Role / Timing Role: Unidirectional clamping diode placed between VDD rail and ground, triggered within <1 ns to limit voltage spikes to ≤14.4 V. Use Value: Prevents latch-up and oxide damage in 3.3 V/5 V logic devices while supporting 100 A surge capability without derating at 85 °C ambient. |
Use Scenario: Input protection for LIN bus transceivers and door module sensors exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line, absorbing energy from ISO 7637-2 Pulse 1 (−150 V/50 ms) and Pulse 2a (+100 V/100 ms). Use Value: Maintains 8.5 V nominal operation while clamping to 14.4 V during surge, preserving communication integrity without crowbar action. |
| Consumer Power Adapters | Industrial Sensor Signal Conditioning |
|
Use Scenario: Secondary-side overvoltage suppression on 5 V/9 V USB-C PD output rails subjected to hot-plug and cable ESD events. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS placed adjacent to DC-DC converter output capacitor, shunting ESD currents before reaching load ICs. Use Value: Limits transient overshoot to 14.4 V with 1.0 µA leakage, avoiding false triggering of OVP circuits while meeting IEC 61000-4-2 Level 4 (8 kV contact). |
Use Scenario: Protection of analog front-end inputs (e.g., 4–20 mA loop receivers, thermocouple amplifiers) from field wiring-induced surges. IC Role / Device Role / Timing Role: Low-leakage (1.0 µA) clamping device on signal line, referenced to local ground, with minimal capacitance impact on bandwidth. Use Value: Preserves signal fidelity below 1 MHz while clamping transients to safe levels for precision op-amps and ADCs with 5 V input ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A-E3/5B | Same electrical specs, but RoHS-compliant with lead-free solderability; no halogen-free certification. | Preferred for commercial-grade designs where halogen content is not regulated; identical thermal and surge performance. | Select SMBJ8.5A-E3/5B when compliance with IPC-1752A halogen restrictions is not required and cost optimization is prioritized. |
| SMAJ8.5A-M3 | Lower 400 W PPPM, smaller SMA (DO-214AC) package, 15.0 V VC at 27.5 A - less robust clamping and lower surge margin. | Suitable only for low-energy transients (e.g., board-level ESD); insufficient for IEC 61000-4-5 or inductive switching. | Choose SMAJ8.5A-M3 only if space constraints prohibit SMB footprint and surge threat level is limited to IEC 61000-4-2. |
Compared with SMBJ8.5A-E3/5B, the SMBJ8.5A-M3/5B offers halogen-free compliance without sacrificing surge rating or thermal performance; versus SMAJ8.5A-M3, it delivers 50% higher peak power handling and tighter clamping, making it suitable for demanding industrial and automotive environments where reliability margins are critical.
Availability
SMBJ8.5A-M3/5B is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and consumer power adapters requiring stable component supply, halogen-free compliance, and repeatable surge protection performance across production batches.
Supply support for SMBJ8.5A-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, efficiency, and application-specific optimization.
The SMBJ series was developed for high-energy transient suppression in compact SMT form factors, targeting automotive, industrial, and computing applications where robustness, thermal stability, and regulatory compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMBJ8.5A-M3/5B under standard test conditions?
The SMBJ8.5A-M3/5B has a maximum clamping voltage (VC) of 14.4 V when subjected to its rated peak pulse current of 41.7 A using the 10/1000 µs waveform. This value is measured at TA = 25 °C with devices mounted on 0.2" × 0.2" copper pads per terminal, and represents the highest voltage seen by the protected circuit during surge events. The SMBJ8.5A-M3/5B maintains this clamping performance across its full operating temperature range.
Is the SMBJ8.5A-M3/5B suitable for automotive applications requiring AEC-Q101 qualification?
No - the SMBJ8.5A-M3/5B is a commercial-grade, halogen-free, RoHS-compliant part but is not AEC-Q101 qualified. For automotive applications requiring qualification, Vishay offers the SMBJ8.5AHM3_B/I variant (with HM3 suffix and revision code), which carries AEC-Q101 certification. The SMBJ8.5A-M3/5B remains suitable for non-automotive industrial and consumer systems where AEC-Q101 is not mandated.
How does the M3 suffix affect the SMBJ8.5A-M3/5B's compliance and assembly process?
The M3 suffix indicates halogen-free, RoHS-compliant construction with matte tin-plated leads that meet J-STD-002 and JESD 22-B102 solderability standards. It also satisfies JESD 201 Class 2 whisker resistance. These properties ensure compatibility with lead-free reflow profiles (peak 260 °C), eliminate brominated flame retardants, and support green manufacturing requirements without altering the SMBJ8.5A-M3/5B's electrical or thermal specifications.
Can the SMBJ8.5A-M3/5B be used in bidirectional protection circuits?
No - the SMBJ8.5A-M3/5B is a unidirectional TVS diode, identifiable by its cathode band marking. For bidirectional protection, Vishay specifies the CA-suffixed variant (e.g., SMBJ8.5CA-M3/5B), which provides symmetrical clamping in both polarities. Using the unidirectional SMBJ8.5A-M3/5B in AC or floating signal paths may result in forward conduction and failure during negative transients.
What is the thermal resistance and recommended PCB layout for optimal surge performance of the SMBJ8.5A-M3/5B?
The SMBJ8.5A-M3/5B has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W and junction-to-lead (RθJL) of 20 °C/W. For reliable 600 W pulse handling, Vishay specifies mounting on minimum 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. Increasing copper area reduces thermal impedance and improves repetitive surge endurance - critical for applications like motor drive snubbing where multiple transients occur.
SMBJ8.5A-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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)
SMBJ8.5A-M3/5B FAQ
1.How can I place an order for SMBJ8.5A-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A-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 SMBJ8.5A-M3/5B reliable?
The price and inventory of SMBJ8.5A-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 SMBJ8.5A-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A-M3/5B?
SMBJ8.5A-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A-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 SMBJ8.5A-M3/5B?
For technical support, including SMBJ8.5A-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A-M3/5B requirements.
6.How does Aetrix verify that SMBJ8.5A-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A-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 SMBJ8.5A-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A-M3/5B?
All SMBJ8.5A-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A-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 SMBJ8.5A-M3/5B part is unused and in its original packaging.
Return procedure for SMBJ8.5A-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A-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 …
