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Vishay General Semiconductor - Diodes Division SMBJ85AHE3_A/I
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- Part No.:
- SMBJ85AHE3_A/I
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHE3_A/I.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,908
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Product details
Overview
SMBJ85AHE3_A/I from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in the SMB (DO-214AA) package, designed to protect sensitive electronics against voltage transients induced by inductive load switching and lightning surges. 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 (IPPM), and 600 W peak pulse power (10/1000 µs waveform), deployed on ICs, MOSFETs, and sensor signal lines in industrial and automotive systems.
For engineers reviewing the SMBJ85AHE3_A/I datasheet, SMBJ85AHE3_A/I pinout, SMBJ85AHE3_A/I application, or SMBJ85AHE3_A/I equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), clamping performance under surge conditions, and precise mechanical dimensions for PCB layout and reliability validation.
Technical Context
This unidirectional TVS diode operates as a voltage-clamped shunt protector: when reverse voltage exceeds VBR, it avalanches to divert transient energy away from downstream circuitry. Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1.0 µA at VWM), while the low incremental surge resistance enables rapid, predictable clamping response during fast transients.
The device is rated for 150 °C maximum junction temperature, meets MSL Level 1 per J-STD-020 (peak reflow 260 °C), and is qualified to AEC-Q101 - confirming suitability for automotive powertrain and body electronics where long-term reliability under thermal cycling and humidity is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe signal line operating margin. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - Confirmed avalanche onset range; ensures consistent turn-on across production lots. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on protected IC or MOSFET. |
| PPPM | 600 W - Peak pulse power handling with 10/1000 µs waveform; supports robust protection against IEC 61000-4-5 Level 4 surges. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance on standard 0.2" × 0.2" copper pads; informs derating above 25 °C ambient. |
| TJ max. | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments and industrial enclosures. |
| AEC-Q101 | Qualified - Validated for automotive applications including engine control units and ADAS sensor interfaces per stress test requirements. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, low-profile case with matte tin-plated leads solderable per J-STD-002 and JESD 22-B102. Cathode indicated by band marking; anode is unmarked end.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Transient current sink | Connected to protected line; conducts surge current to ground when VREV > VBR. |
| Anode (unbanded end) | Reference node | Typically tied to system ground or common return path; completes shunt path during clamping event. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HAST, and ESD testing - required for engine control and safety-critical modules. |
| 600 W peak pulse power (10/1000 µs) | Supports high-energy transient suppression per IEC 61000-4-5 without degradation; enables single-device protection for 24 V industrial buses. |
| Glass-passivated junction | Ensures stable VBR tolerance and low leakage (<1.0 µA) over lifetime and temperature - critical for low-power sensor front-ends. |
| MSL Level 1 (260 °C peak) | Compatible with standard lead-free reflow profiles without moisture sensitivity concerns - eliminates pre-bake requirement in SMT lines. |
| Low clamping ratio (VC/VBR ≈ 1.39) | Minimizes overvoltage stress on protected components; improves margin for 100 V-rated MOSFETs and 3.3 V/5 V logic interfaces. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial 24 V DC Power Input |
|---|---|
Use Scenario: Protection of microcontroller I/O and CAN transceiver pins against load dump and alternator ripple in 12 V/24 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional shunt TVS placed between signal line and chassis ground to clamp transients before they reach sensitive inputs. Use Value: With 137 V clamping and AEC-Q101 qualification, SMBJ85AHE3_A/I prevents latch-up and gate oxide damage in ECUs operating up to +125 °C ambient. |
Use Scenario: Surge protection on 24 V DC input rails of PLC I/O modules exposed to inductive switching noise from solenoids and contactors. IC Role / Device Role / Timing Role: Primary overvoltage clamp on main power rail, coordinated with upstream fuse and downstream DC-DC converter. Use Value: 600 W rating and 85 V VWM allow reliable operation across full 24 V nominal range while suppressing 1 kV/0.5 Ω IEC 61000-4-5 surges. |
| Telecom Remote Radio Unit (RRU) | Automotive ADAS Camera Module |
Use Scenario: Reverse polarity and lightning-induced surge protection on RS-485/RS-232 communication lines in outdoor base station equipment. IC Role / Device Role / Timing Role: Unidirectional TVS on differential data lines referenced to local ground plane to limit common-mode overvoltage. Use Value: Low capacitance (<100 pF typical) avoids signal integrity degradation at 10 Mbps rates; 100 °C/W RθJA enables thermal stability in sealed enclosures. |
Use Scenario: Signal line protection for MIPI CSI-2 interface between image sensor and SoC in rear-view and surround-view camera systems. IC Role / Device Role / Timing Role: Point-of-entry TVS on FPC flex cable connectors to absorb ESD and board-level transients before reaching serializer IC. Use Value: AEC-Q101 qualification and 150 °C TJ max ensure compliance with automotive environmental stress tests; compact SMB package fits tight space constraints near connectors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHM3_A/I | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected when halogen-free material compliance is mandated by OEM or regional regulations. | Choose SMBJ85AHM3_A/I if halogen-free bill-of-materials is required; otherwise SMBJ85AHE3_A/I offers standard RoHS compliance. |
| SMCJ85AHE3_A/I | Same VWM/VBR/VC ratings but in larger SMC (DO-214AB) package; higher RθJA (60 °C/W) and 1500 W PPPM rating. | Used where higher surge energy handling or improved thermal dissipation is needed, e.g., main power rail vs. signal line. | Select SMBJ85AHE3_A/I for space-constrained signal-level protection; choose SMCJ85AHE3_A/I only when 1500 W surge capability or lower thermal resistance is essential. |
Compared with SMBJ85AHM3_A/I, SMBJ85AHE3_A/I provides identical protection performance with standard RoHS compliance, while SMCJ85AHE3_A/I trades footprint size for higher power handling - making SMBJ85AHE3_A/I optimal for compact, cost-sensitive signal-line designs requiring AEC-Q101 assurance.
Availability
SMBJ85AHE3_A/I is available at Aetrix Electronics and suitable for automotive engine control units, industrial 24 V power supplies, and telecom remote radio units requiring stable component supply, AEC-Q101 traceability, and long-term manufacturing continuity.
Supply support for SMBJ85AHE3_A/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, TVS devices, and power MOSFETs with emphasis on reliability, precision, and application-specific qualification.
The SMBJ series was engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - balancing compact size, AEC-Q101 compliance, and repeatable clamping performance across temperature and life cycle.
FAQ
What is the maximum clamping voltage of SMBJ85AHE3_A/I under a 10/1000 µs surge?
The SMBJ85AHE3_A/I has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM) under the standardized 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 worst-case surge events - critical for ensuring compatibility with 100 V-rated MOSFETs and 3.3 V/5 V logic interfaces downstream of the SMBJ85AHE3_A/I.
Is SMBJ85AHE3_A/I qualified for automotive applications?
Yes, SMBJ85AHE3_A/I is AEC-Q101 qualified, as confirmed in the Vishay datasheet revision 09-Jan-2024 (document 88392), section "MECHANICAL DATA". This qualification covers stress tests including temperature cycling, high-accelerated temperature/humidity stress (HAST), and ESD, validating SMBJ85AHE3_A/I for use in engine control units, body electronics, and ADAS modules where long-term reliability under thermal and environmental stress is mandatory.
What does the "HE3" suffix indicate in SMBJ85AHE3_A/I?
Per Vishay's ordering information (page 3 of document 88392), the "HE3" suffix denotes a RoHS-compliant, AEC-Q101 qualified version of the SMBJ85A device. The "H" indicates AEC-Q101 qualification, "E3" confirms RoHS compliance and commercial grade, and "_A/I" specifies packaging: "A" is the revision code, "I" denotes 13-inch tape-and-reel delivery (3200 units per reel). This distinguishes SMBJ85AHE3_A/I from non-automotive variants like SMBJ85A-E3.
How does SMBJ85AHE3_A/I compare to bidirectional TVS diodes like SMBJ85CA?
SMBJ85AHE3_A/I is unidirectional and intended for DC-biased lines where polarity is fixed (e.g., 24 V power rails or signal lines referenced to ground); SMBJ85CA is bidirectional and used on AC or floating lines (e.g., RS-485 differential pairs). SMBJ85AHE3_A/I exhibits forward conduction below ~1.5 V, while SMBJ85CA clamps symmetrically in both directions - making SMBJ85AHE3_A/I unsuitable for AC applications but offering tighter VWM control and lower leakage in DC configurations.
What is the thermal resistance of SMBJ85AHE3_A/I, and how does it affect layout?
SMBJ85AHE3_A/I has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal, as specified in the Thermal Characteristics table (page 3 of document 88392). This value requires adequate copper area and minimal trace length to maintain junction temperature below 150 °C under repeated surges; reducing pad size or adding thermal vias directly under the SMBJ85AHE3_A/I cathode/anode terminals lowers effective RθJA and improves surge endurance.
SMBJ85AHE3_A/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:
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85AHE3_A/I FAQ
1.How can I place an order for SMBJ85AHE3_A/I through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHE3_A/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 SMBJ85AHE3_A/I reliable?
The price and inventory of SMBJ85AHE3_A/I are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85AHE3_A/I is usually 5 days.
3.What payment methods are accepted for SMBJ85AHE3_A/I?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHE3_A/I transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHE3_A/I?
SMBJ85AHE3_A/I orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHE3_A/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 SMBJ85AHE3_A/I?
For technical support, including SMBJ85AHE3_A/I datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHE3_A/I requirements.
6.How does Aetrix verify that SMBJ85AHE3_A/I is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHE3_A/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 SMBJ85AHE3_A/I meets industry standards.
7.What is the process for return or replacement of SMBJ85AHE3_A/I?
All SMBJ85AHE3_A/I units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHE3_A/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 SMBJ85AHE3_A/I part is unused and in its original packaging.
Return procedure for SMBJ85AHE3_A/I:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85AHE3_A/I Tags
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