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Vishay General Semiconductor - Diodes Division SMBJ85AHM3/H
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- Part No.:
- SMBJ85AHM3/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,387
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Product details
Overview
SMBJ85AHM3/H 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 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power (10/1000 µs waveform), used to protect MOSFETs, ICs, and sensor interfaces in industrial power supplies and telecom infrastructure.
For engineers reviewing the SMBJ85AHM3/H datasheet, SMBJ85AHM3/H pinout, SMBJ85AHM3/H application, or SMBJ85AHM3/H equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance data, junction-to-lead thermal path details, and real-world protection use cases - all confirmed from Vishay's official 88392 document revision 09-Jan-2024.
Technical Context
This TVS diode operates as a unidirectional clamping device with cathode-band polarity marking, optimized for fast response (<1 ns) to ESD and lightning-induced surges. Its glass-passivated junction ensures stable breakdown behavior, while the 100 °C/W junction-to-ambient thermal resistance (RθJA) and 20 °C/W junction-to-lead (RθJL) support reliable operation under repetitive surge conditions when mounted on 5.0 mm × 5.0 mm copper pads.
The SMBJ85AHM3/H is halogen-free and RoHS-compliant (HM3 suffix), qualified to AEC-Q101 for automotive-grade reliability, and rated for -55 °C to +150 °C operating junction temperature. Its 1.0 µA max reverse leakage at 85 V (VWM) and 0.106 %/°C VBR temperature coefficient ensure predictable clamping across thermal environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe working margin for 72–85 V DC bus protection. |
| VBR min / max | 94.4 V / 104 V at 1 mA - Verified breakdown range ensures consistent turn-on threshold across production lots. |
| VC @ IPPM | 137 V at 4.4 A (10/1000 µs) - Clamping voltage limits downstream component stress during surge events. |
| PPPM | 600 W - Peak pulse power handling capacity per standard 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 compliance. |
| ID @ VWM | 1.0 µA - Ultra-low reverse leakage preserves efficiency in high-impedance sensing or battery-backed circuits. |
| TJ max | +150 °C - Enables deployment in under-hood automotive modules and industrial motor drives with elevated ambient temperatures. |
| RθJL | 20 °C/W - Low junction-to-lead thermal resistance allows effective heat transfer to PCB copper, critical for surge duty cycling. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, matte tin-plated leads solderable per J-STD-002. Cathode identified by black band at one end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to system ground or low-side return path; conducts during forward surge or bias conditions. |
| Cathode | Clamping output terminal | Connected to protected line (e.g., 85 V rail); sinks surge current into ground when VLINE exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against IEC 61000-4-5 combined wave surges without derating in standard PCB layouts. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics where long-term reliability under thermal cycling is mandatory. |
| Halogen-free & RoHS-compliant | Meets EU Directive 2011/65/EU and IPC-1752A material declaration requirements for green manufacturing. |
| MSL Level 1 (260 °C peak reflow) | Supports single-pass lead-free reflow assembly without moisture sensitivity concerns or baking preconditioning. |
| Low incremental surge resistance | Minimizes clamping voltage overshoot during fast-rising transients (e.g., inductive switch-off in solenoid drivers). |
Applications
| Industrial Power Supply Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Protects 85 V auxiliary power rails in programmable logic controller (PLC) power stages from load dump and inductive kickback. IC Role / Device Role / Timing Role: Unidirectional clamping TVS placed between input rail and chassis ground, activated within <1 ns of overvoltage event. Use Value: Limits transient voltage to ≤137 V, preventing damage to downstream DC-DC controllers rated for 100 V absolute maximum. |
Use Scenario: Shields LIN bus interface ICs and microcontroller I/O pins in BCMs from battery reverse connection and jump-start surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on 12 V supply line upstream of LDO regulators, conducting only during >94.4 V excursions. Use Value: Maintains 1.0 µA leakage at nominal 13.5 V, avoiding quiescent current penalty while meeting ISO 7637-2 Pulse 1/2a immunity. |
| Telecom DC Feeder Line Protection | Motor Drive Gate Driver Protection |
Use Scenario: Safeguards remote radio unit (RRU) power inputs fed via 85 V PoE++-derived midspan injectors against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Primary front-end TVS on DC input, coordinated with GDT and MOV secondary protection stages. Use Value: 600 W rating sustains multiple 10/1000 µs surges without degradation, supporting GR-1089-CORE Zone 4 compliance. |
Use Scenario: Guards isolated gate driver ICs (e.g., SiC MOSFET drivers) from Miller-induced voltage spikes during high-dV/dt switching. IC Role / Device Role / Timing Role: Local clamping device across driver VDD–VEE rails, placed adjacent to driver IC for minimal loop inductance. Use Value: 20 °C/W RθJL enables rapid heat dissipation into driver PCB copper, sustaining 1000+ surge cycles at 1 Hz repetition rate. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHE3/H | Same electrical specs, but RoHS-compliant commercial grade (E3) without halogen-free certification or AEC-Q101 qualification. | Lacks automotive qualification; suitable for industrial/commercial designs where halogen-free is not mandated. | Select SMBJ85AHE3/H for cost-sensitive non-automotive applications requiring identical clamping performance. |
| SMAJ85AHE3/A | Lower 400 W PPPM rating, SMA (DO-214AC) package with higher RθJA (140 °C/W), same VWM/VBR/VC. | Reduced surge endurance and inferior thermal performance limit use to low-duty-cycle or low-power signal-line protection. | Choose SMAJ85AHE3/A only when board space constraints prohibit SMB footprint and surge energy is below 400 W. |
Compared with SMBJ85AHE3/H, the SMBJ85AHM3/H adds halogen-free compliance and AEC-Q101 qualification without sacrificing clamping performance; versus SMAJ85AHE3/A, it delivers 50 % higher surge power handling and 2.5× better thermal dissipation - critical for automotive and industrial power rail protection.
Availability
SMBJ85AHM3/H is available at Aetrix Electronics and suitable for industrial power supply protection, automotive body control modules, telecom DC feeder lines, and motor drive gate driver protection requiring stable component supply and full traceability.
Supply support for SMBJ85AHM3/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, MOSFETs, and protection devices with emphasis on reliability, power efficiency, and AEC-Q qualification.
The SMBJ series is engineered for high-energy transient suppression in harsh environments - targeting automotive, industrial, and telecom systems where failure resilience and long-term parametric stability are non-negotiable.
FAQ
What is the clamping voltage of SMBJ85AHM3/H at its rated peak pulse current?
The SMBJ85AHM3/H has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM) under the standard 10/1000 µs waveform. This value is measured per Figure 1 in Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ85AHM3/H maintains this clamping performance across its qualified temperature range (-55 °C to +150 °C).
Is SMBJ85AHM3/H qualified for automotive applications?
Yes, SMBJ85AHM3/H is AEC-Q101 qualified, as confirmed by the "HM3" suffix and footnote (1) in Vishay's document 88392. This qualification covers stress testing for temperature cycling, humidity bias, mechanical shock, and surge endurance - validating its use in automotive body electronics, power distribution units, and infotainment power supplies. The SMBJ85AHM3/H meets the full AEC-Q101-011 standard for TVS diodes.
What does the "HM3" suffix indicate for SMBJ85AHM3/H?
The "HM3" suffix in SMBJ85AHM3/H denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. It distinguishes this variant from E3 (RoHS-compliant commercial) and HE3 (RoHS + AEC-Q101) versions. The HM3 version satisfies automotive material compliance requirements including JESD201 Class 2 whisker resistance and UL 94 V-0 flammability for the molding compound - all verified in Vishay's 88392 datasheet.
How does SMBJ85AHM3/H compare to SMBJ85AHE3/H in thermal performance?
Both SMBJ85AHM3/H and SMBJ85AHE3/H share identical thermal characteristics: 100 °C/W RθJA and 20 °C/W RθJL, per Vishay's thermal characterization in document 88392. The HM3 variant adds halogen-free content but does not alter thermal resistance values. Their identical package (SMB/DO-214AA) and mounting pad recommendations ensure equivalent thermal behavior in production PCB layouts.
What is the reverse leakage current specification for SMBJ85AHM3/H at its stand-off voltage?
The SMBJ85AHM3/H specifies a maximum reverse leakage current (ID) of 1.0 µA at its 85 V stand-off voltage (VWM), tested at TA = 25 °C. This ultra-low leakage preserves system efficiency in always-on circuits and avoids false triggering in high-impedance monitoring paths. The value is confirmed in the "ELECTRICAL CHARACTERISTICS" table of Vishay document 88392 for all SMBJ85A variants, including HM3.
SMBJ85AHM3/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:
- 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/H FAQ
1.How can I place an order for SMBJ85AHM3/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3/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 SMBJ85AHM3/H reliable?
The price and inventory of SMBJ85AHM3/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85AHM3/H is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3/H?
SMBJ85AHM3/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3/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 SMBJ85AHM3/H?
For technical support, including SMBJ85AHM3/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3/H requirements.
6.How does Aetrix verify that SMBJ85AHM3/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3/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 SMBJ85AHM3/H meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3/H?
All SMBJ85AHM3/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3/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 SMBJ85AHM3/H part is unused and in its original packaging.
Return procedure for SMBJ85AHM3/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3/H Tags
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