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Vishay General Semiconductor - Diodes Division SMBJ85AHM3/I
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- Part No.:
- SMBJ85AHM3/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:4,598
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Product details
Overview
SMBJ85AHM3/I 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, 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 SMBJ85AHM3/I datasheet, SMBJ85AHM3/I pinout, SMBJ85AHM3/I application, or SMBJ85AHM3/I equivalent, this device is selected for robust overvoltage protection where low leakage (<1.0 µA at 85 V), fast response time, and AEC-Q101-qualified halogen-free construction are required in automotive and industrial environments.
Technical Context
This unidirectional TVS diode operates as a voltage-clamping protection element placed in parallel with sensitive circuit nodes. Its glass-passivated junction ensures stable avalanche characteristics, while its low incremental surge resistance enables effective energy diversion during transient events such as inductive load switching or ESD.
The SMBJ85AHM3/I is rated for 150 °C maximum junction temperature and exhibits a +0.106 %/°C temperature coefficient of VBR. It meets MSL Level 1 per J-STD-020, supports reflow soldering up to 260 °C peak, and is halogen-free and RoHS-compliant under Vishay's HM3 suffix standard.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on during transients. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage seen by protected circuit during 600 W transient; limits stress on downstream components. |
| IPPM | 4.4 A - Peak pulse current capability with 10/1000 µs waveform; determines survivability under standardized surge conditions. |
| PPPM | 600 W - Peak pulse power handling capacity; defines transient energy absorption limit without failure. |
| ID @ VWM | ≤1.0 µA - Reverse leakage at rated stand-off voltage; critical for low-power or high-impedance sensing circuits. |
| TJ max | 150 °C - Maximum junction temperature; sets thermal derating boundary for sustained operation and surge repetition. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode-banded unidirectional configuration. Matte tin-plated leads, compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or lower-potential rail; completes conduction path during reverse-biased transient clamping. |
| Cathode | High-side connection point | Marked with band; connects to protected line (e.g., 85 V supply rail); conducts avalanche current when VIN exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables reliable suppression of IEC 61000-4-5 Level 3 surges (e.g., 1 kV/42 Ω) without degradation. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring extended reliability and temperature cycling performance. |
| Halogen-free & RoHS-compliant | Meets environmental compliance mandates for industrial and consumer end equipment without compromising surge robustness. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow profiles up to 260 °C peak, simplifying SMT manufacturing. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage overshoot during clamping, reducing risk of latch-up or gate oxide damage in protected MOSFETs/ICs. |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: Protecting 12 V/24 V battery-connected ECUs against load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed across input rail to clamp spikes up to 137 V, preventing damage to LDOs and microcontrollers. Use Value: Withstands 600 W surges and operates up to 150 °C ambient, meeting ISO 7637-2 Pulse 5a requirements in engine bay environments. |
Use Scenario: Shielding analog output lines of pressure/temperature sensors from ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-leakage (≤1.0 µA) clamping device installed at connector entry point to suppress ±8 kV contact ESD per IEC 61000-4-2. Use Value: Fast response time and 137 V clamping limit ensure sensor signal integrity remains intact during transient events. |
| DC-DC Converter Input Protection | Motor Drive Gate Driver Protection |
|
Use Scenario: Safeguarding buck converter inputs in factory automation systems exposed to inductive switching noise. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing repetitive 10/1000 µs transients induced by nearby relay or solenoid actuation. Use Value: 0.01 % duty cycle rating supports long-term reliability under intermittent surge conditions without thermal runaway. |
Use Scenario: Protecting high-side gate driver ICs from Miller-induced voltage spikes during MOSFET switching transitions. IC Role / Device Role / Timing Role: Clamps transient overshoot on gate drive lines to prevent unintended turn-on or gate oxide breakdown. Use Value: Low incremental surge resistance minimizes voltage overshoot propagation into gate driver logic, preserving timing margins. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHE3/I | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification; suitable only for non-automotive industrial or consumer applications. | Select SMBJ85AHE3/I if halogen-free or AEC-Q101 compliance is not required and cost optimization is prioritized. |
| SMBJ85CAHM3/I | Bidirectional variant with identical VWM (85 V), but symmetrical clamping in both polarities; VC = 137 V same magnitude. | Used where AC-coupled or bidirectional signal lines (e.g., RS-485, CAN bus) require protection against polarity-agnostic transients. | Choose SMBJ85CAHM3/I only when protecting balanced differential interfaces or systems subject to reverse-polarity faults. |
Compared with SMBJ85AHM3/I, SMBJ85AHE3/I offers identical surge performance but lacks halogen-free and automotive qualification, while SMBJ85CAHM3/I provides bidirectional clamping at the expense of unidirectional optimization for DC rails - selection depends strictly on system-level polarity requirements and compliance mandates.
Availability
SMBJ85AHM3/I is available at Aetrix Electronics and suitable for automotive power modules, industrial sensor subsystems, and DC-DC converter designs requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ85AHM3/I 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, and protection devices with emphasis on reliability, efficiency, and application-specific validation.
The SMBJ series was developed for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom infrastructure where consistent clamping performance and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum clamping voltage of the SMBJ85AHM3/I under a 10/1000 µs surge?
The SMBJ85AHM3/I has a maximum clamping voltage (VC) of 137 V at its rated peak pulse current of 4.4 A with a 10/1000 µs waveform. This value is measured per IEC 61000-4-5 test conditions and defines the upper voltage limit imposed on protected circuitry during standardized surge events. The SMBJ85AHM3/I maintains this clamping performance across its specified operating temperature range.
Is the SMBJ85AHM3/I suitable for automotive applications?
Yes, the SMBJ85AHM3/I is AEC-Q101 qualified and manufactured with halogen-free, RoHS-compliant materials per Vishay's HM3 suffix standard. It is explicitly intended for automotive powertrain, body control, and infotainment systems requiring validated reliability under thermal cycling, humidity, and surge stress. The SMBJ85AHM3/I meets ISO 7637-2 Pulse 5a load dump immunity requirements when properly mounted.
What does the "HM3" suffix indicate in SMBJ85AHM3/I?
The "HM3" suffix denotes Vishay's halogen-free, RoHS-compliant, commercial-grade construction with AEC-Q101 qualification. It specifies matte tin-plated leads, MSL Level 1 moisture sensitivity, and reflow compatibility up to 260 °C peak. Unlike E3-suffix variants, SMBJ85AHM3/I satisfies automotive environmental and reliability standards without requiring additional qualification testing by the end user.
How does the SMBJ85AHM3/I differ from the bidirectional SMBJ85CAHM3/I?
The SMBJ85AHM3/I is unidirectional and optimized for DC rail protection, with cathode marking and forward conduction capability only in one direction. In contrast, SMBJ85CAHM3/I is bidirectional, offering symmetrical clamping for AC or polarity-agnostic signals like CAN or RS-485. Both share identical VWM, VC, and PPPM, but SMBJ85AHM3/I provides lower leakage and better DC blocking - making it preferred for 85 V supply line protection.
What is the thermal resistance junction-to-ambient for SMBJ85AHM3/I?
The SMBJ85AHM3/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on the minimum recommended pad layout (0.2" × 0.2" copper pads per terminal). This value assumes no heatsinking and defines the steady-state temperature rise above ambient at 5.0 W power dissipation. For pulsed operation, transient thermal impedance must be evaluated using Figure 5 in the Vishay datasheet 88392.
SMBJ85AHM3/I Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85AHM3/I FAQ
1.How can I place an order for SMBJ85AHM3/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3/I 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 SMBJ85AHM3/I reliable?
The price and inventory of SMBJ85AHM3/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85AHM3/I is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3/I?
SMBJ85AHM3/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3/I 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 SMBJ85AHM3/I?
For technical support, including SMBJ85AHM3/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3/I requirements.
6.How does Aetrix verify that SMBJ85AHM3/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3/I 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 SMBJ85AHM3/I meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3/I?
All SMBJ85AHM3/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3/I, 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 SMBJ85AHM3/I part is unused and in its original packaging.
Return procedure for SMBJ85AHM3/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3/I Tags
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