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Vishay General Semiconductor - Diodes Division SMBJ85AHM3_A/H
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- Part No.:
- SMBJ85AHM3_A/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3_A/H.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,361
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Product details
Overview
SMBJ85AHM3_A/H from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in SMB (DO-214AA) package, designed for robust overvoltage protection of sensitive electronics. It features 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 - deployed on power rails and signal lines of industrial motor drives and automotive ECUs.
For engineers reviewing the SMBJ85AHM3_A/H datasheet, SMBJ85AHM3_A/H pinout, SMBJ85AHM3_A/H application, or SMBJ85AHM3_A/H equivalent, key selection criteria include clamping performance under 4.4 A surge, thermal resistance (RθJA = 100 °C/W), AEC-Q101 qualification status, halogen-free RoHS compliance, and compatibility with automated SMT placement on 5.0 mm × 5.0 mm copper pads.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds its specified VBR range (94.4–104 V). Its low incremental surge resistance ensures stable clamping during fast transients, while the glass-passivated junction enables repeatable surge handling up to 100 A IFSM (8.3 ms half-sine).
Designed for surface-mount assembly, it meets MSL Level 1 per J-STD-020 with 260 °C peak reflow profile and exhibits <1.0 µA maximum reverse leakage at 85 V. The cathode band denotes polarity, and its DO-214AA outline supports standard SMB footprint layouts without modification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC/AC working margin. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown threshold range; determines minimum overvoltage trigger point. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs surge; directly limits stress on downstream ICs. |
| PPPM | 600 W - Peak pulse power handling capability; validates protection against IEC 61000-4-5 Level 4 surges. |
| IPPM | 4.4 A - Peak pulse current supported at rated clamping voltage; correlates to surge energy absorption (≈2.2 J). |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments. |
| RθJA | 100 °C/W - Thermal resistance junction-to-ambient; informs PCB copper pad sizing for sustained power dissipation. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, AEC-Q101 qualified. Cathode indicated by molded band; anode and cathode terminals are symmetrical in outline but polarized.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-impedance return path; forms clamping loop with cathode during transient events. |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12 V rail); conducts avalanche current to anode when VWM exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per stress test plan. |
| 600 W peak pulse power | Supports IEC 61000-4-5 4th-level surge immunity (4 kV line-earth, 2 kV line-line) without degradation. |
| Halogen-free & RoHS-compliant | Meets JEDEC JS709E and IPC-1752A material declarations; suitable for green manufacturing and export compliance. |
| MSL Level 1 moisture sensitivity | Allows unlimited floor life and standard reflow without baking; compatible with high-throughput SMT lines. |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term surge endurance across 1000+ pulses at rated IPPM. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Card |
|---|---|
|
Use Scenario: Protects microcontroller GPIO and CAN transceiver power pins from load-dump and jump-start transients in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional clamping device placed between fused 12 V supply and local LDO input. Use Value: Limits voltage to ≤137 V during 100 V/400 ms load dump, preventing LDO overvoltage failure and MCU brownout. |
Use Scenario: Shields 24 V digital input optocoupler circuitry from inductive kickback generated by solenoid valve switching. IC Role / Device Role / Timing Role: Primary surge suppression element on field-side input trace prior to series resistor and opto-LED. Use Value: Clamps 600 V/0.5 A transients within 1 ns, maintaining optocoupler CTR integrity and eliminating false triggering. |
| Telecom Power Supply Front-End | Medical Infusion Pump Motor Driver |
|
Use Scenario: Safeguards AC-DC converter primary-side controller ICs from lightning-induced surges coupled via AC mains. IC Role / Device Role / Timing Role: Secondary-stage TVS on DC bus after MOV, absorbing residual energy missed by upstream protection. Use Value: Handles 600 W pulses without thermal runaway, enabling compact layout with no heatsink required on 5 mm × 5 mm pads. |
Use Scenario: Guards H-bridge gate drivers from back-EMF spikes during rapid DC motor commutation in battery-powered infusion pumps. IC Role / Device Role / Timing Role: Local clamp across motor phase outputs, referenced to driver ground plane. Use Value: Maintains VC ≤137 V under 4.4 A surge, preventing gate oxide rupture in 40 V-rated MOSFETs and ensuring dose accuracy. |
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_A/H | Same electrical specs and package, but RoHS-compliant without halogen-free certification; non-AEC-Q101. | Approved for commercial/industrial use only; not validated for automotive temperature cycling or humidity testing. | Select when halogen-free requirement is absent and automotive qualification is unnecessary. |
| SMCJ85A-H | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC ratings; not AEC-Q101 qualified. | Used where higher surge margin is needed and board space allows larger footprint; lacks automotive stress validation. | Choose for heavy-industrial surge environments where 1500 W headroom justifies larger PCB area and non-automotive qualification. |
Compared with SMBJ85AHM3_A/H, SMBJ85AHE3_A/H offers identical clamping and thermal performance but omits halogen-free and AEC-Q101 validation, while SMCJ85A-H trades footprint compactness for doubled surge capacity - making SMBJ85AHM3_A/H optimal for space-constrained, automotive-grade designs requiring full compliance.
Availability
SMBJ85AHM3_A/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, telecom power supplies, and medical motor control systems requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMBJ85AHM3_A/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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering precise clamping, low leakage, and validated surge endurance in compact surface-mount packages.
FAQ
What is the clamping voltage of SMBJ85AHM3_A/H at its rated peak pulse current?
The SMBJ85AHM3_A/H has a maximum clamping voltage (VC) of 137 V at its rated peak pulse current of 4.4 A using the 10/1000 µs waveform. This value is measured under standardized test conditions with 0.2" × 0.2" copper pads and defines the upper voltage limit imposed on protected circuits during surge events. The SMBJ85AHM3_A/H maintains this clamping performance across its full operating temperature range.
Is SMBJ85AHM3_A/H qualified for automotive applications?
Yes, SMBJ85AHM3_A/H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and surge endurance specifically for automotive use. The "HM3" suffix confirms halogen-free, RoHS-compliant construction and AEC-Q101 validation - making SMBJ85AHM3_A/H suitable for under-hood and body-control module deployments.
What is the standoff voltage and breakdown voltage range for SMBJ85AHM3_A/H?
The SMBJ85AHM3_A/H has a reverse stand-off voltage (VWM) of 85 V and a breakdown voltage (VBR) range of 94.4 V to 104 V at 1 mA test current. This 9.4 V design margin between VWM and minimum VBR ensures reliable non-conduction during normal operation while guaranteeing fast avalanche response when transients exceed the threshold. These values are confirmed per Vishay Document Number 88392.
Does SMBJ85AHM3_A/H require special PCB layout considerations?
Yes - for optimal thermal and surge performance, SMBJ85AHM3_A/H should be mounted on minimum 5.0 mm × 5.0 mm copper pads per terminal, as specified in the datasheet. This pad size ensures the rated RθJA of 100 °C/W and supports 600 W pulse dissipation. Avoid narrow traces or thermal reliefs on either terminal; direct copper pour connection is recommended to sustain repeated surge events without junction overheating.
How does the halogen-free status of SMBJ85AHM3_A/H impact compliance and assembly?
The halogen-free status of SMBJ85AHM3_A/H complies with JEDEC JS709E and major OEM green directives, eliminating brominated flame retardants from the molding compound. During assembly, it behaves identically to standard SMB devices - supporting MSL Level 1 handling, 260 °C peak reflow, and J-STD-002 solderability - with no process changes required. This makes SMBJ85AHM3_A/H drop-in compatible in existing SMT lines while meeting evolving environmental regulations.
SMBJ85AHM3_A/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:
- Obsolete
- 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_A/H FAQ
1.How can I place an order for SMBJ85AHM3_A/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3_A/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_A/H reliable?
The price and inventory of SMBJ85AHM3_A/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_A/H is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3_A/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3_A/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3_A/H?
SMBJ85AHM3_A/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3_A/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_A/H?
For technical support, including SMBJ85AHM3_A/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3_A/H requirements.
6.How does Aetrix verify that SMBJ85AHM3_A/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3_A/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_A/H meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3_A/H?
All SMBJ85AHM3_A/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3_A/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_A/H part is unused and in its original packaging.
Return procedure for SMBJ85AHM3_A/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3_A/H Tags
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