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Vishay General Semiconductor - Diodes Division SMBJ85CAHM3_B/H
- Part No.:
- SMBJ85CAHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHM3_B/H.pdf
- Description:
- 600W,85V 5%,BIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,004
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Product details
Overview
SMBJ85CAHM3_B/H from Vishay General Semiconductor is a bidirectional 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed on power rails and signal lines in industrial motor drives and telecom interface circuits.
For engineers reviewing the SMBJ85CAHM3_B/H datasheet, SMBJ85CAHM3_B/H pinout, SMBJ85CAHM3_B/H application, or SMBJ85CAHM3_B/H equivalent, this page delivers verified electrical parameters, bidirectional clamping behavior, thermal derating curves, AEC-Q101 qualification status, and halogen-free RoHS-compliant construction per JESD201 Class 2 whisker testing.
Technical Context
This TVS diode operates symmetrically in both directions, enabling protection of AC-coupled or differential signal paths without polarity constraints. Its glass-passivated junction ensures stable VBR tolerance (±5%) and low incremental surge resistance, while MSL Level 1 moisture sensitivity supports lead-free reflow up to 260 °C peak.
The device sustains repetitive 600 W transients at 0.01% duty cycle and exhibits <0.01 μA reverse leakage at 85 V, making it suitable for high-impedance sensor interfaces and low-power microcontroller I/O protection where standby current integrity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM (Stand-off Voltage) | 85 V - Maximum continuous reverse voltage before significant leakage; defines safe operating margin below clamping threshold. |
| VBR (Breakdown Voltage) | 94.4–104 V at 1 mA - Confirmed bidirectional avalanche onset range; ensures predictable turn-on during transients. |
| VC (Clamping Voltage) | 137 V at IPPM = 4.4 A - Peak voltage seen by protected circuit under 10/1000 µs surge; limits stress on downstream ICs. |
| PPPM (Peak Pulse Power) | 600 W - Sustained energy absorption capability with standard lightning/surge waveform; validated per ANSI/IEEE C62.35. |
| ID (Reverse Leakage) | ≤1.0 μA at 85 V - Minimal DC loading on high-impedance nodes; preserves battery life in always-on sensor systems. |
| TJ max. | +150 °C - Enables operation in under-hood automotive or enclosed industrial enclosures without thermal shutdown. |
| Package | SMB (DO-214AA) - Standardized 2-pin surface-mount outline with 5.0 mm × 3.9 mm footprint; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), bidirectional configuration - no polarity marking; symmetrical terminals accept voltage transients from either direction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (symmetrical) | Bidirectional transient conduction path | Either terminal serves as anode or cathode depending on instantaneous voltage polarity; no PCB orientation dependency. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against IEC 61000-4-5 Level 3 surges (1 kV/2 Ω) on 24 V industrial buses. |
| AEC-Q101 qualified (HM3 suffix) | Validated for automotive powertrain and body electronics applications requiring zero defect reliability under temperature cycling and humidity exposure. |
| Halogen-free, RoHS-compliant construction | Meets EU Directive 2011/65/EU and JEDEC J-STD-201 Class 2 whisker resistance; eliminates brominated flame retardants in molding compound. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free soldering processes without preconditioning; eliminates moisture-related popcorning risk. |
| Low clamping ratio (VC/VWM = 1.61) | Minimizes overvoltage overshoot during fast transients, reducing risk of latch-up or gate oxide damage in MOSFET drivers. |
Applications
| Industrial Motor Drives | Telecom Line Interface |
|---|---|
|
Use Scenario: Protection of gate driver inputs and feedback sensing lines against switching-induced voltage spikes in 48 V BLDC inverters. IC Role / Device Role / Timing Role: Bidirectional clamping element placed across isolated gate drive transformer secondary or op-amp input nodes. Use Value: Limits transient excursions to ≤137 V, preventing false triggering of overvoltage comparators and preserving PWM timing accuracy. |
Use Scenario: Surge suppression on RS-485 transceiver bus lines exposed to lightning-induced common-mode transients in outdoor base stations. IC Role / Device Role / Timing Role: Primary front-end TVS on differential pair, shunting energy before it reaches the transceiver's ESD diodes. Use Value: Absorbs 600 W surges without degradation, maintaining signal integrity and avoiding bit errors during 10 Mbps data transmission. |
| Automotive Body Control Module | Consumer Appliance Power Supply |
|
Use Scenario: Input rail protection for LIN bus transceivers and LED driver ICs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Standoff-rated TVS connected between VBAT and GND, activated only during >85 V events. Use Value: Withstands 100 A surge current (IFSM-equivalent) and maintains ≤1 μA leakage at 13.5 V nominal, ensuring low quiescent power draw. |
Use Scenario: Secondary-side overvoltage clamp on 12 V DC output of switched-mode power supplies in smart home hubs. IC Role / Device Role / Timing Role: Fast-response crowbar device parallel to output capacitor, triggered by regulator failure or feedback loop loss. Use Value: Clamps within nanoseconds to 137 V, preventing downstream MCU brownout resets and preserving firmware state during fault conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CAHE3_B/H | Same electrical specs, but RoHS-compliant with tin-lead plating (not halogen-free); lacks JESD201 Class 2 whisker certification. | Suitable for commercial-grade industrial controls where halogen-free requirement is not mandated. | Select when cost sensitivity outweighs automotive or green compliance needs. |
| SMAJ85CAHM3 | Lower PPPM (400 W), same VWM/VBR/VC; SMA package (smaller footprint, higher RθJA = 140 °C/W). | Limited to lower-energy transients; unsuitable for IEC 61000-4-5 Level 3 or automotive load dump. | Choose only if board space is constrained and surge threat level is ≤400 W. |
Compared with SMBJ85CAHM3_B/H, SMBJ85CAHE3_B/H trades halogen-free compliance for broader commercial availability, while SMAJ85CAHM3 sacrifices 33% pulse power headroom and thermal performance for reduced PCB area - neither offers pin-to-pin replacement without layout or derating review.
Availability
SMBJ85CAHM3_B/H is available at Aetrix Electronics and suitable for industrial motor drives, telecom line interface protection, and automotive body control modules requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ85CAHM3_B/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 targets high-energy transient suppression in harsh environments - engineered for automotive, industrial, and telecom systems where consistent clamping performance and AEC-Q101 validation are mandatory.
FAQ
What is the clamping voltage of SMBJ85CAHM3_B/H at its rated peak pulse current?
The SMBJ85CAHM3_B/H has a maximum clamping voltage (VC) of 137 V when subjected to its specified peak pulse current (IPPM) of 4.4 A using the 10/1000 µs waveform. This value is measured under standardized test conditions per ANSI/IEEE C62.35 and represents the upper voltage limit imposed on protected circuitry during surge events - critical for ensuring downstream ICs remain within absolute maximum ratings. The SMBJ85CAHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ85CAHM3_B/H suitable for automotive applications?
Yes, SMBJ85CAHM3_B/H is AEC-Q101 qualified (denoted by the HM3 suffix), meaning it has passed rigorous stress tests including temperature cycling, humidity bias, and mechanical shock - specifically validated for automotive body electronics, infotainment, and power distribution modules. Its halogen-free, RoHS-compliant construction and MSL Level 1 rating further support use in modern automotive manufacturing processes. The SMBJ85CAHM3_B/H meets requirements for load dump immunity and ISO 7637-2 pulse testing when applied per Vishay's recommended layout guidelines.
How does the bidirectional design of SMBJ85CAHM3_B/H affect PCB layout?
The SMBJ85CAHM3_B/H has no polarity marking and functions identically in both directions, eliminating orientation constraints during placement - simplifying assembly and reducing risk of misorientation defects. Unlike unidirectional TVS diodes, it requires no cathode band alignment and can protect AC-coupled signals, differential buses (e.g., RS-485), or floating power domains without additional components. This symmetry allows direct placement across any two-node interface where transient polarity is undefined or reversible, and the SMBJ85CAHM3_B/H maintains identical VBR, VC, and IPPM in either direction per datasheet specifications.
What is the thermal resistance of SMBJ85CAHM3_B/H, and how does it impact power dissipation?
The SMBJ85CAHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended copper pads (0.2" × 0.2"), and a junction-to-lead resistance (RθJL) of 20 °C/W. These values define how effectively heat generated during surge events dissipates into the PCB. At 5.0 W steady-state power dissipation (PD), the junction temperature rise above ambient is ~500 °C - which exceeds maximum rating - confirming that PD applies only to continuous DC conditions, while the 600 W PPPM rating is strictly for short-duration transients. The SMBJ85CAHM3_B/H relies on thermal mass and transient duration, not steady-state cooling, for surge handling.
Does SMBJ85CAHM3_B/H meet UL recognition standards?
Yes, SMBJ85CAHM3_B/H carries Underwriters Laboratories (UL) recognition under file number E136766 for both unidirectional and bidirectional configurations, compliant with UL 497B for signal line protectors. This certification validates its performance in surge suppression applications involving telecommunications, data lines, and low-voltage control circuits - confirming dielectric strength, flammability (UL 94 V-0), and repeatable clamping behavior under standardized surge waveforms. The UL listing applies directly to the SMBJ85CAHM3_B/H part number as manufactured and tested by Vishay, not inferred from family-level data.
SMBJ85CAHM3_B/H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ85CAHM3_B/H FAQ
1.How can I place an order for SMBJ85CAHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHM3_B/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 SMBJ85CAHM3_B/H reliable?
The price and inventory of SMBJ85CAHM3_B/H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHM3_B/H?
SMBJ85CAHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHM3_B/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 SMBJ85CAHM3_B/H?
For technical support, including SMBJ85CAHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHM3_B/H requirements.
6.How does Aetrix verify that SMBJ85CAHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHM3_B/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 SMBJ85CAHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHM3_B/H?
All SMBJ85CAHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHM3_B/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 SMBJ85CAHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ85CAHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHM3_B/H Tags
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