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Vishay General Semiconductor - Diodes Division SMBJ85D-M3/H
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- Part No.:
- SMBJ85D-M3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85D-M3/H.pdf
- Description:
- TVS DIODE 85VWM 135VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,385
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Product details
Overview
SMBJ85D-M3/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed for robust overvoltage protection of DC power rails and signal lines. It features a 85 V stand-off voltage (VWM), 95.7–103 V breakdown voltage (VBR) at 1 mA, 135 V maximum clamping voltage (VC) at 4.46 A peak pulse current, and 600 W peak pulse power rating with 10/1000 μs waveform.
For engineers reviewing the SMBJ85D-M3/H datasheet, SMBJ85D-M3/H pinout, SMBJ85D-M3/H application, or SMBJ85D-M3/H equivalent, key selection criteria include clamping performance under surge conditions, thermal derating behavior on PCB pads, unidirectional polarity for DC rail protection, and M3-grade halogen-free, RoHS-compliant, industrial-grade construction meeting JESD 201 Class 2 whisker resistance.
Technical Context
This TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its low incremental surge resistance ensures minimal voltage overshoot during fast transients, while its ±3.5 % VBR tolerance enables precise coordination with system overvoltage thresholds.
Designed for mounting on minimum recommended pad layout (5.0 mm × 5.0 mm copper), it delivers 1.0 W steady-state power dissipation at TA = 25 °C and 5.0 W at TM = 50 °C, with thermal resistance RθJA = 125 °C/W and RθJM = 20 °C/W - critical for thermal management in compact industrial and telecom power supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before significant leakage; defines safe DC rail protection threshold |
| VBR min/max | 95.7 V / 103 V at 1.0 mA - tight ±3.5 % tolerance ensures predictable turn-on timing across production lots |
| VC @ IPPM | 135 V at 4.46 A - clamping voltage under 10/1000 μs surge; limits stress on protected ICs or MOSFETs |
| PPPM | 600 W - peak pulse power handling per 10/1000 μs waveform; supports IEC 61000-4-5 Level 4 surge immunity |
| ID @ VWM | 0.5 μA - ultra-low reverse leakage preserves efficiency in high-impedance sensor or battery-backed circuits |
| TJ max | +150 °C - extended junction temperature rating enables reliable operation in enclosed industrial enclosures |
| Package | SMB (DO-214AA) - industry-standard surface-mount outline with 2.20 mm height; compatible with automated pick-and-place |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated, M3 suffix indicating halogen-free, RoHS-compliant, industrial-grade construction and JESD 201 Class 2 whisker resistance. Polarity: cathode denoted by band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or lowest potential node; forms shunt path during avalanche conduction |
| Cathode (banded end) | High-side input terminal | Connected to protected line (e.g., +85 V rail); reverse-biased during normal operation |
Key Features
| Feature | Design Value |
|---|---|
| ±3.5 % VBR tolerance | Enables precise coordination with system overvoltage lockout thresholds without margin stacking |
| 600 W PPPM (10/1000 μs) | Meets IEC 61000-4-5 surge immunity requirements for industrial power inputs and telecom interfaces |
| 0.5 μA ID @ VWM | Minimizes standby power loss in always-on systems such as IoT edge nodes and remote sensors |
| MSL Level 1 (260 °C peak) | Supports standard lead-free reflow profiles without moisture sensitivity concerns or baking requirements |
| M3 industrial grade | Guarantees long-term reliability under thermal cycling, humidity, and mechanical stress in harsh environments |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Line Protection |
|---|---|
Use Scenario: Protecting 48 V or 72 V DC distribution rails in programmable logic controllers (PLCs) and motor drives against inductive switching transients and lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between rail and chassis ground; clamps within nanoseconds to limit voltage excursion below MOSFET or controller absolute maximum ratings. Use Value: Prevents field failures caused by repetitive 600 W surges, extending mean time between failures (MTBF) in factory automation equipment. | Use Scenario: Safeguarding -48 V DC feeder lines in central office and remote radio head (RRH) equipment against induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Primary overvoltage clamp on telecom power entry; coordinated with upstream fuses and downstream DC-DC converters to meet GR-1089-CORE immunity requirements. Use Value: Maintains uninterrupted service during surge events by limiting clamped voltage to 135 V - well below isolation barrier and rectifier diode breakdown limits. |
| Automotive Body Control Module (BCM) Input Protection | Industrial Sensor Signal Line Protection |
Use Scenario: Protecting 12 V or 24 V supply inputs in automotive BCMs exposed to load dump (ISO 7637-2 Pulse 5a) and jump-start transients. IC Role / Device Role / Timing Role: First-line transient suppressor on main power input; absorbs up to 600 W pulses while maintaining low leakage to avoid battery drain. Use Value: Complies with AEC-Q200 stress test requirements when mounted per recommended pad layout, enabling qualification for under-hood applications. | Use Scenario: Shielding analog sensor outputs (e.g., pressure, temperature) in industrial process control systems from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance unidirectional TVS placed at connector interface; suppresses sub-100 ns ESD pulses without distorting low-bandwidth signals. Use Value: Preserves signal integrity with only 0.5 μA leakage at 85 V, avoiding offset errors in precision 4–20 mA loop receivers. |
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-M3/H | Same VWM (85 V), but tighter VBR tolerance (±2.5 %); otherwise identical electrical specs and package | Better suited for designs requiring tighter coordination with overvoltage detection thresholds | Select SMBJ85A-M3/H if system-level fault detection demands < ±3 % VBR matching |
| P6SMB85A | Same VWM and VC, but lower PPPM (600 W vs. 600 W - identical), different marking code and minor thermal resistance variation (RθJA = 130 °C/W) | Legacy alternative with broader distributor availability but no M3 industrial-grade assurance | Choose P6SMB85A only for cost-sensitive legacy redesigns where M3 compliance is not required |
Compared with SMBJ85D-M3/H, SMBJ85A-M3/H offers improved VBR consistency for precision threshold alignment, while P6SMB85A provides functional equivalence without M3-grade reliability certification - making SMBJ85D-M3/H the preferred choice for new industrial and telecom designs requiring guaranteed long-term stability and environmental resilience.
Availability
SMBJ85D-M3/H is available at Aetrix Electronics and suitable for industrial power supply protection, telecom DC feeder line hardening, and automotive body control module input conditioning requiring stable component supply, consistent M3-grade material compliance, and full traceability.
Supply support for SMBJ85D-M3/H 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, TVS devices, and optoelectronics with emphasis on reliability, power handling, and industrial-grade qualification.
The SMBJ series was developed specifically for high-energy transient suppression in space-constrained, high-reliability applications including industrial automation, telecom infrastructure, and automotive electronics - delivering 600 W surge capability in the compact SMB footprint.
FAQ
What is the clamping voltage of SMBJ85D-M3/H at its rated peak pulse current?
The SMBJ85D-M3/H has a maximum clamping voltage (VC) of 135 V at its rated peak pulse current (IPPM) of 4.46 A, measured using the standard 10/1000 μs double-exponential surge waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during a worst-case transient event. The SMBJ85D-M3/H maintains this clamping performance consistently due to its low incremental surge resistance and controlled avalanche characteristics.
Is SMBJ85D-M3/H suitable for bidirectional signal line protection?
No, SMBJ85D-M3/H is a unidirectional TVS diode, indicated by the "D" (not "CD") suffix and presence of a cathode band. It is intended for DC rail protection where polarity is fixed, such as +85 V power inputs. For bidirectional signal lines like RS-485 or USB data pairs, use the SMBJ85CD-M3/H variant instead, which provides symmetrical clamping in both directions and lacks a polarity band. Using SMBJ85D-M3/H on AC or bipolar signals risks forward conduction and failure.
What does the "M3/H" suffix signify in SMBJ85D-M3/H?
The "M3" suffix denotes halogen-free, RoHS-compliant, industrial-grade construction meeting JESD 201 Class 2 whisker resistance, while "H" specifies packaging in 7″ diameter plastic tape and reel with 750 units per reel. This combination ensures compliance with environmental regulations, long-term reliability under thermal cycling, and compatibility with high-speed SMT assembly lines. The M3 grade is explicitly validated for use in industrial and telecom equipment where extended lifetime and contamination control are mandatory.
How does SMBJ85D-M3/H perform thermally on standard PCB layouts?
SMBJ85D-M3/H exhibits a typical junction-to-ambient thermal resistance (RθJA) of 125 °C/W when mounted on the minimum recommended pad layout (5.0 mm × 5.0 mm copper area), supporting 1.0 W steady-state power dissipation at 25 °C ambient. Derating begins above 25 °C per the published curve, reaching zero dissipation at 125 °C ambient. For higher power handling, mounting on larger copper areas reduces RθJA to 100 °C/W, enabling 5.0 W dissipation at 50 °C case temperature - critical for sustained surge duty cycles in enclosed enclosures.
Can SMBJ85D-M3/H replace older SMBJ85A variants in existing designs?
Yes, SMBJ85D-M3/H is a direct form-fit-function replacement for SMBJ85A-M3/H and SMBJ85A-E3/54, sharing identical VWM (85 V), VC (135 V), PPPM (600 W), and SMB package dimensions. The "D" suffix reflects updated Vishay internal revision control but retains all electrical and mechanical specifications. No PCB layout changes are needed; however, designers should verify that the ±3.5 % VBR tolerance (vs. ±2.5 % for "A") remains acceptable for their overvoltage coordination scheme.
SMBJ85D-M3/H 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):
- 95.7V
- Voltage - Clamping (Max) @ Ipp:
- 135V
- Current - Peak Pulse (10/1000µs):
- 4.46A
- 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)
SMBJ85D-M3/H FAQ
1.How can I place an order for SMBJ85D-M3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85D-M3/H 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 SMBJ85D-M3/H reliable?
The price and inventory of SMBJ85D-M3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85D-M3/H is usually 5 days.
3.What payment methods are accepted for SMBJ85D-M3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85D-M3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85D-M3/H?
SMBJ85D-M3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85D-M3/H 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 SMBJ85D-M3/H?
For technical support, including SMBJ85D-M3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85D-M3/H requirements.
6.How does Aetrix verify that SMBJ85D-M3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85D-M3/H 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 SMBJ85D-M3/H meets industry standards.
7.What is the process for return or replacement of SMBJ85D-M3/H?
All SMBJ85D-M3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85D-M3/H, 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 SMBJ85D-M3/H part is unused and in its original packaging.
Return procedure for SMBJ85D-M3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85D-M3/H Tags
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