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Vishay General Semiconductor - Diodes Division SMBJ85AHM3_B/H
- Part No.:
- SMBJ85AHM3_B/H
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHM3_B/H.pdf
- Description:
- 600W,85V 5%,UNIDIR,SMB TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,758
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Product details
Overview
SMBJ85AHM3_B/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 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_B/H datasheet, SMBJ85AHM3_B/H pinout, SMBJ85AHM3_B/H application, or SMBJ85AHM3_B/H equivalent, this device is evaluated for overvoltage protection in DC power rails, automotive body electronics, and I/O line surge immunity where fast response (<1 ps), low clamping ratio (VC/VBR ≈ 1.45), and AEC-Q101 qualification are critical selection criteria.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, conducting only in reverse bias above VBR while blocking up to 85 V in normal operation. Its glass-passivated junction ensures stable breakdown characteristics and low leakage (<1.0 µA at VWM), and its thermal resistance (RθJA = 100 °C/W) supports operation up to +150 °C junction temperature.
The device complies with ANSI/IEEE C62.35 surge standards and delivers repeatable 600 W transient suppression under 0.01% duty cycle. Its MSL Level 1 rating and matte tin-plated leads meet J-STD-002 solderability requirements, enabling compatibility with lead-free reflow processes peaking at 260 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe DC rail margin for 12 V–48 V systems. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown range ensures reliable triggering without premature conduction during normal operation. |
| VC @ IPPM | 137 V at 4.4 A - Clamping voltage limits downstream component stress during 10/1000 µs transients; clamping ratio = 1.45. |
| PPPM | 600 W - Peak pulse power handling capability per single 10/1000 µs surge event; validated per Fig. 1 derating curve. |
| IPPM | 4.4 A - Peak pulse current corresponding to VC; derived from PPPM/VC = 600 W / 137 V. |
| TJ max. | +150 °C - Maximum junction temperature enables use in under-hood automotive and high-ambient industrial environments. |
| Leakage @ VWM | <1.0 µA - Ultra-low reverse leakage preserves system efficiency and avoids false triggering in high-impedance sensing paths. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, halogen-free, RoHS-compliant, with matte tin-plated leads. Cathode indicated by band marking on cathode end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path); conducts during forward surge (IFSM = 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 85 V rail); initiates avalanche breakdown when transient exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including body control modules and infotainment power rails per stress test requirements. |
| 600 W peak pulse power | Withstands IEC 61000-4-5 Level 4 surges (4 kV/2 Ω) on 12 V/24 V systems without degradation. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage exposure to downstream ICs compared to higher-ratio TVS devices. |
| MSL Level 1, 260 °C peak reflow | Enables single-pass lead-free assembly without moisture-related popcorning or delamination. |
| Glass passivated junction | Ensures long-term stability of VBR and leakage across temperature and lifetime cycling. |
Applications
| Automotive Body Electronics | Industrial Power Supply Input |
|---|---|
|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy on 12 V supply rail upstream of LDO regulators. Use Value: Limits voltage excursion to ≤137 V during 100 ms load dump events, preserving MCU reset integrity and EEPROM data retention. |
Use Scenario: Safeguarding AC-DC converter primary-side controllers and optocoupler feedback paths against lightning-induced surges. IC Role / Device Role / Timing Role: Fast-acting shunt clamp on DC bus input prior to switching FET gate drivers. Use Value: Responds in <1 ps to suppress 600 W transients, preventing false triggering of overvoltage protection circuits. |
| Telecom Interface Protection | Sensor Signal Line Guarding |
|
Use Scenario: Shielding RS-485 transceivers in base station remote units from EFT and surge coupling on long cable runs. IC Role / Device Role / Timing Role: Standoff-rated TVS placed between differential pair and ground to absorb common-mode transients. Use Value: Maintains signal integrity with <1.0 µA leakage at 85 V, avoiding DC offset drift in precision receiver inputs. |
Use Scenario: Securing analog outputs of pressure/temperature sensors in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF) unidirectional clamp on 4–20 mA loop supply line. Use Value: Prevents latch-up in op-amp front-ends during 8 kV contact ESD events per IEC 61000-4-2. |
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/H | Same electrical specs; RoHS-compliant but not halogen-free; uses standard tin plating instead of matte tin. | Approved for commercial-grade industrial use but not AEC-Q101 automotive qualification. | Select when halogen-free content is not required and cost optimization is prioritized over automotive compliance. |
| SMCJ85A-M3/5B | Higher 1500 W PPPM, larger SMC (DO-214AB) package, same VWM/VBR range, 150 °C TJ max. | Used where higher surge margin is needed (e.g., outdoor telecom enclosures), but requires PCB layout change. | Choose when system-level surge testing exceeds 600 W and board space allows SMC footprint. |
Compared with SMBJ85AHM3_B/H, SMBJ85AHE3_B/H offers identical clamping performance without halogen-free assurance, while SMCJ85A-M3/5B trades compact SMB size for 2.5× higher surge capacity - making the original optimal for space-constrained AEC-Q101 designs needing verified 600 W immunity.
Availability
SMBJ85AHM3_B/H is available at Aetrix Electronics and suitable for automotive body electronics, industrial power supply inputs, telecom interface protection, and sensor signal line guarding requiring stable component supply and full traceability.
Supply support for SMBJ85AHM3_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, and protection devices with emphasis on reliability, automotive qualification, and high-volume manufacturability.
The SMBJ series is engineered for robust transient suppression in harsh environments - targeting automotive, industrial, and telecom applications where consistent clamping, low leakage, and AEC-Q101 validation are mandatory.
FAQ
What is the maximum clamping voltage of SMBJ85AHM3_B/H at its rated peak pulse current?
The SMBJ85AHM3_B/H has a maximum clamping voltage (VC) of 137 V at its specified peak pulse current (IPPM) of 4.4 A, measured under the standardized 10/1000 µs waveform. This value is confirmed in the Electrical Characteristics table on page 2 of Vishay document 88392 and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ85AHM3_B/H maintains this clamping performance across its full operating temperature range.
Is SMBJ85AHM3_B/H qualified for automotive applications?
Yes, SMBJ85AHM3_B/H is AEC-Q101 qualified, as explicitly stated in the Mechanical Data section and Ordering Information table of the Vishay datasheet (document 88392, revision 09-Jan-2024). The "HM3" suffix denotes halogen-free, RoHS-compliant, and AEC-Q101 qualified construction. This qualification covers stress tests including HTGB, HTRB, TCT, and ESD, making SMBJ85AHM3_B/H suitable for under-hood and body electronics in passenger vehicles and commercial vehicles.
What does the "_B/H" suffix indicate in SMBJ85AHM3_B/H?
The "_B/H" suffix in SMBJ85AHM3_B/H specifies packaging configuration: "B" denotes tape-and-reel format, and "H" indicates a 7-inch diameter reel containing 750 units. This matches the preferred package code "H" listed in the Ordering Information table (page 3 of document 88392). The full ordering code confirms halogen-free (HM3), AEC-Q101 qualified, and 7″ reel delivery - critical for automated SMT placement and automotive traceability requirements.
How does SMBJ85AHM3_B/H compare to bidirectional variants like SMBJ85CA?
SMBJ85AHM3_B/H is unidirectional, meaning it clamps only in reverse bias and conducts forward current up to 100 A (IFSM). In contrast, SMBJ85CA is bidirectional with symmetrical clamping in both polarities and no forward conduction path. The unidirectional SMBJ85AHM3_B/H provides lower leakage (<1.0 µA vs. ≤2.0 µA for CA types at same VWM) and is preferred for DC power rail protection, whereas SMBJ85CA suits AC-coupled or floating signal lines. SMBJ85AHM3_B/H's cathode band marking also enables polarity verification during placement.
What is the thermal resistance and maximum power dissipation of SMBJ85AHM3_B/H?
SMBJ85AHM3_B/H has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2″ × 0.2″ copper pads, and a steady-state power dissipation (PD) rating of 5.0 W at 50 °C ambient. These values are defined in the Thermal Characteristics and Maximum Ratings tables (pages 2–3 of document 88392). The 100 °C/W RθJA informs heatsinking requirements for sustained surge repetition, while the 5.0 W PD sets the upper limit for continuous power handling outside transient conditions.
SMBJ85AHM3_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:
- 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/H FAQ
1.How can I place an order for SMBJ85AHM3_B/H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHM3_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 SMBJ85AHM3_B/H reliable?
The price and inventory of SMBJ85AHM3_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 SMBJ85AHM3_B/H is usually 5 days.
3.What payment methods are accepted for SMBJ85AHM3_B/H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHM3_B/H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHM3_B/H?
SMBJ85AHM3_B/H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHM3_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 SMBJ85AHM3_B/H?
For technical support, including SMBJ85AHM3_B/H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHM3_B/H requirements.
6.How does Aetrix verify that SMBJ85AHM3_B/H is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHM3_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 SMBJ85AHM3_B/H meets industry standards.
7.What is the process for return or replacement of SMBJ85AHM3_B/H?
All SMBJ85AHM3_B/H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHM3_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 SMBJ85AHM3_B/H part is unused and in its original packaging.
Return procedure for SMBJ85AHM3_B/H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHM3_B/H Tags
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