My Inquiry
My Account
Vishay General Semiconductor - Diodes Division SMBJ85AHM3_B/I
- Part No.:
- SMBJ85AHM3_B/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3_B/I.pdf
- Description:
- 600W,85V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:5,647
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMBJ85AHM3_B/I 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 DC power rails 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 - deployed in industrial motor drives, automotive body control modules, and telecom power supplies.
For engineers reviewing the SMBJ85AHM3_B/I datasheet, SMBJ85AHM3_B/I pinout, SMBJ85AHM3_B/I application, or SMBJ85AHM3_B/I 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 standard PCB pad layouts.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging glass-passivated silicon junction technology to deliver sub-nanosecond response to transients. Its cathode-band polarity marking enables unambiguous orientation during assembly, and it sustains repetitive 600 W surges at 0.01 % duty cycle without degradation when mounted on 5.0 mm × 5.0 mm copper pads.
The device meets J-STD-020 MSL Level 1 moisture sensitivity and withstands peak reflow temperatures up to 260 °C. With a maximum junction temperature of +150 °C and thermal resistance RθJL = 20 °C/W, it supports reliable operation in high-ambient environments such as engine bay electronics and industrial PLC I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before leakage exceeds 1 µA; defines safe DC rail margin for 72–96 V systems. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Ensures consistent avalanche initiation across production lots; guarantees clamping starts no later than 104 V. |
| VC @ IPPM | 137 V at 4.4 A (10/1000 µs) - Limits downstream IC stress during surge events; compatible with 150 V-rated MOSFETs and gate drivers. |
| PPPM | 600 W - Sustains standardized lightning/surge immunity per IEC 61000-4-5 (Level 4); requires no external heat sinking under typical PCB layout. |
| IFSM | 100 A (8.3 ms half-sine) - Withstands inrush currents from capacitive loads or relay coil de-energization without failure. |
| TJ max. | +150 °C - Enables deployment in under-hood automotive and high-temperature industrial enclosures without derating. |
| Package | SMB (DO-214AA) - 0.205" × 0.130" footprint; optimized for high-density routing and automated optical inspection (AOI). |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional polarity marked by cathode band. Matte tin-plated leads compliant with J-STD-002 and JESD 22-B102 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; forms clamping loop with cathode during transient events. |
| Cathode | Protected line input | Connected to the line being protected (e.g., 85 V supply rail); avalanche conduction occurs from cathode to anode during overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing - suitable for BCM, lighting, and ADAS power domains. |
| Halogen-free & RoHS-compliant | HM3 suffix denotes full compliance with JEDEC J-STD-20 and EU RoHS Directive 2011/65/EU - required for Tier-1 automotive and green industrial programs. |
| 600 W peak pulse power | Clamps 10/1000 µs surges up to 4.4 A without degradation - meets IEC 61000-4-5 Level 4 (4 kV line-to-ground) with minimal board space. |
| Low incremental surge resistance | Enables tight VC–VBR margin (≤137 V clamping at 94.4 V breakdown), reducing voltage overshoot on sensitive 100 V-rated components. |
| MSL Level 1 rating | Zero floor life limitation; can be stored indefinitely at ≤30 °C/60 % RH and assembled without baking - reduces manufacturing overhead. |
Applications
| Automotive Body Control Module | Industrial 48–96 V DC Power Rail |
|---|---|
|
Use Scenario: Protects microcontroller I/O and CAN transceiver power inputs from load dump and alternator ripple in vehicle body electronics. IC Role / Device Role / Timing Role: Unidirectional TVS clamping element placed between fused 85 V supply and local LDO regulator input. Use Value: Limits transient excursions to ≤137 V, preventing latch-up or gate oxide damage in 100 V tolerant PMICs and MCU power domains. |
Use Scenario: Shields programmable logic controller (PLC) analog input front-ends from inductive kickback in solenoid-driven factory automation systems. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 85 V auxiliary supply feeding precision ADC reference buffers and op-amp signal chains. Use Value: Maintains <1 µA leakage at 85 V, preserving 16-bit measurement accuracy while surviving repeated 600 W surges. |
| Telecom Remote Radio Unit (RRU) | Server PSU Hold-Up Capacitor Protection |
|
Use Scenario: Safeguards Ethernet PHY power pins and bias networks against ESD and lightning-induced surges in outdoor base station equipment. IC Role / Device Role / Timing Role: Secondary-level TVS on isolated 85 V bias rail feeding RF power amplifier bias controllers. Use Value: Responds in <1 ns to ESD events (IEC 61000-4-2 ±15 kV contact), limiting voltage rise before protection ICs activate. |
Use Scenario: Prevents overvoltage failure of hold-up capacitors and synchronous rectifiers during AC line dropout recovery in 1U server PSUs. IC Role / Device Role / Timing Role: Clamping diode across bulk capacitor bank output, triggered only during abnormal 100+ V transients. Use Value: Absorbs 600 W energy without thermal runaway, enabling single-device protection instead of multi-diode stacks. |
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_B/I | Same electrical specs, but RoHS-compliant (non-halogen-free) and commercial-grade (not AEC-Q101 qualified). | Lacks automotive qualification; suitable for industrial/commercial designs where AEC-Q101 is not mandated. | Select when cost sensitivity outweighs halogen-free or automotive requirements. |
| SMCJ85A-HM3 | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VC ratings. | Used where higher surge margin is needed (e.g., primary-side AC/DC input), but requires larger PCB area and different pad layout. | Choose when system-level surge testing exceeds 600 W or when legacy SMC footprint is fixed. |
Compared with SMBJ85AHM3_B/I, SMBJ85AHE3_B/I offers identical clamping and power handling but omits halogen-free and AEC-Q101 validation, while SMCJ85A-HM3 delivers double the surge capacity in a physically larger package - making SMBJ85AHM3_B/I optimal for space-constrained, automotive-qualified 85 V rail protection.
Availability
SMBJ85AHM3_B/I is available at Aetrix Electronics and suitable for automotive body control modules, industrial 48–96 V DC power rails, telecom remote radio units, and server PSU hold-up capacitor protection requiring stable component supply and long-term lifecycle assurance.
Supply support for SMBJ85AHM3_B/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, 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 robust surge endurance in compact surface-mount packages.
FAQ
What is the maximum clamping voltage of SMBJ85AHM3_B/I under a 10/1000 µs surge?
The SMBJ85AHM3_B/I has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the standardized 10/1000 µs waveform. This value is guaranteed across temperature and production lot variations, ensuring predictable overvoltage limiting for downstream 100 V-rated components. The SMBJ85AHM3_B/I achieves this with low incremental resistance and fast avalanche response.
Is SMBJ85AHM3_B/I qualified for automotive applications?
Yes, SMBJ85AHM3_B/I is AEC-Q101 qualified, as confirmed by Vishay's ordering code suffix "HM3" and documentation in the SMBJ5.0A–SMBJ188A datasheet (Rev. 09-Jan-2024, p. 3, Note 1). This qualification covers stress tests including temperature cycling, high-temperature reverse bias, and ESD - validating its use in automotive body control modules, lighting systems, and ADAS power domains. The SMBJ85AHM3_B/I meets all required failure rate and lifetime criteria.
What does the "HM3" suffix indicate in SMBJ85AHM3_B/I?
The "HM3" suffix in SMBJ85AHM3_B/I denotes halogen-free, RoHS-compliant construction with AEC-Q101 qualification. Per Vishay's ordering information table (p. 3), HM3 parts use molding compounds and plating that meet JEDEC J-STD-20 and EU RoHS Directive requirements while also passing automotive reliability testing. This distinguishes SMBJ85AHM3_B/I from E3 (RoHS-only) and HE3 (AEC-Q101, non-halogen-free) variants - confirming its suitability for green automotive programs.
What is the thermal resistance of SMBJ85AHM3_B/I, and how does it affect PCB layout?
SMBJ85AHM3_B/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal. This value assumes standard FR-4 PCB with no internal planes. To maintain TJ ≤ 150 °C under worst-case 5.0 W steady-state dissipation, designers must ensure adequate copper area and avoid excessive ambient temperature buildup. The SMBJ85AHM3_B/I's RθJL = 20 °C/W further supports localized heat extraction via lead conduction.
Can SMBJ85AHM3_B/I replace SMBJ85AHE3_B/I in an existing design?
SMBJ85AHM3_B/I is a direct functional replacement for SMBJ85AHE3_B/I in terms of electrical parameters (VWM, VBR, VC, PPPM) and package (SMB/DO-214AA), but adds halogen-free material content and AEC-Q101 qualification. No PCB layout change is required. However, if the original design does not require automotive qualification or halogen-free compliance, SMBJ85AHE3_B/I remains a lower-cost alternative. The SMBJ85AHM3_B/I maintains identical pinout, polarity marking, and soldering profile.
SMBJ85AHM3_B/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:
- Active
- 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 (SMB)
SMBJ85AHM3_B/I FAQ
1.How can I place an order for SMBJ85AHM3_B/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3_B/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_B/I reliable?
The price and inventory of SMBJ85AHM3_B/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_B/I is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3_B/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3_B/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3_B/I?
SMBJ85AHM3_B/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3_B/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_B/I?
For technical support, including SMBJ85AHM3_B/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3_B/I requirements.
6.How does Aetrix verify that SMBJ85AHM3_B/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3_B/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_B/I meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3_B/I?
All SMBJ85AHM3_B/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3_B/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_B/I part is unused and in its original packaging.
Return procedure for SMBJ85AHM3_B/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3_B/I 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
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 …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
