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Vishay General Semiconductor - Diodes Division SMBJ85AHE3/52
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- Part No.:
- SMBJ85AHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AHE3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,508
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Product details
Overview
SMBJ85AHE3/52 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 (IPPM), and 600 W peak pulse power rating with 10/1000 µs waveform - deployed in automotive power supply inputs and industrial sensor interfaces.
For engineers reviewing the SMBJ85AHE3/52 datasheet, SMBJ85AHE3/52 pinout, SMBJ85AHE3/52 application, or SMBJ85AHE3/52 equivalent, this page delivers verified electrical parameters, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), junction temperature range (–55 to +150 °C), and real-world clamping behavior under surge conditions - critical for ESD and load-dump protection design validation.
Technical Context
This TVS diode operates as a unidirectional avalanche clamp, leveraging glass-passivated silicon junction technology to deliver sub-nanosecond response time and low incremental surge resistance. Its cathode-band polarity marking enables unambiguous PCB orientation during automated placement on 0.2" × 0.2" copper pads.
The device is rated for 600 W peak pulse power (10/1000 µs), 5.0 W steady-state power dissipation at TA = 50 °C, and 100 A non-repetitive forward surge current (8.3 ms half-sine). Thermal resistance from junction to ambient is 100 °C/W, and it meets MSL Level 1 per J-STD-020 with 260 °C reflow peak.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous reverse operating voltage before clamping initiates; defines safe DC rail margin for 12 V/24 V/48 V systems. |
| VBR (min/max) | 94.4 V / 104 V at IT = 1 mA - guaranteed breakdown window ensures predictable turn-on across temperature and unit variation. |
| VC @ IPPM | 137 V at 4.4 A - clamping voltage limits downstream IC stress during 10/1000 µs transients (e.g., ISO 7637-2 Pulse 1/2a/5a). |
| PPPM | 600 W - peak surge energy handling capacity with standardized 10/1000 µs waveform; validated per ANSI/IEEE C62.35. |
| TJ max. | +150 °C - extended junction temperature rating supports under-hood automotive and high-ambient industrial environments. |
| RθJA | 100 °C/W - thermal resistance value used to calculate junction temperature rise under sustained power dissipation. |
| AEC-Q101 | Qualified - certified for automotive-grade reliability including HTOL, TC, UHAST, and ESD testing per AEC specification. |
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; polarity indicated by cathode band.
| 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 events (IFSM = 100 A). |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 85 V rail); avalanches into low-impedance state when reverse voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables single-device protection against ISO 16750-2 load dump and IEC 61000-4-5 surges without external series impedance. |
| AEC-Q101 qualified | Validated for automotive electronics use including engine control units, body controllers, and ADAS power domains. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast transients, improving clamping precision and reducing stress on downstream MOSFETs or regulators. |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture sensitivity concerns or baking requirements. |
| Glass passivated junction | Ensures stable leakage performance (ID ≤ 1.0 µA at VWM) and long-term reliability under thermal cycling and humidity exposure. |
Applications
| Automotive Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
|
Use Scenario: Protecting 24 V battery-fed ECUs from load dump transients (ISO 16750-2 Pulse 5a) and jump-start spikes. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients within 1 ns. Use Value: Limits peak voltage to ≤137 V at 4.4 A, preventing damage to 36 V-rated DC-DC converters and microcontrollers. |
Use Scenario: Shielding analog output lines (e.g., 4–20 mA current loop) from ESD and inductive switching noise in factory automation. IC Role / Device Role / Timing Role: Low-capacitance TVS connected across signal and return to shunt fast transients before reaching ADC input. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) with <1 ns response, preserving signal integrity without loading the 100 kΩ loop impedance. |
| Telecom DC Power Rail Clamp | Consumer Device USB Port Surge Guard |
|
Use Scenario: Safeguarding 48 V PoE-powered equipment (e.g., IP cameras) against lightning-induced surges on Ethernet pairs. IC Role / Device Role / Timing Role: Primary TVS on secondary-side DC bus, coordinated with upstream gas discharge tube (GDT) for staged protection. Use Value: Handles 600 W surge energy while maintaining VWM = 85 V margin above nominal 48 V, enabling compact two-stage designs. |
Use Scenario: Adding secondary-level surge immunity to USB-C power delivery circuits in portable monitors and docking stations. IC Role / Device Role / Timing Role: Unidirectional clamp on VBUS line to suppress hot-plug transients and conducted noise from adapters. Use Value: Withstands 100 A 8.3 ms surge (IFSM) and clamps to 137 V, protecting USB PD controllers rated up to 20 V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85AHM3/52 | Halogen-free, RoHS-compliant variant with identical electrical specs and AEC-Q101 qualification. | No functional difference; selected where halogen-free material compliance is mandated (e.g., EU automotive Tier 1 programs). | Choose SMBJ85AHM3/52 when halogen-free bill-of-materials is required; same footprint, thermal, and electrical behavior. |
| SMCJ85AHE3/52 | 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 (>600 W) or improved thermal dissipation is needed, e.g., heavy-duty motor drives. | Select SMCJ85AHE3/52 only if board layout allows larger SMC footprint and system requires >600 W surge capability. |
Compared with SMBJ85AHE3/52, SMBJ85AHM3/52 offers identical protection performance with halogen-free construction, while SMCJ85AHE3/52 trades compactness for higher surge rating and lower thermal resistance - making SMBJ85AHE3/52 optimal for space-constrained AEC-Q101 designs needing precise 600 W clamping.
Availability
SMBJ85AHE3/52 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, and telecom DC power rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ85AHE3/52 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 optoelectronics with emphasis on reliability and application-specific performance.
The SMBJ series was engineered for high-reliability transient suppression in automotive, industrial, and telecom infrastructure - delivering consistent clamping, AEC-Q101 qualification, and robust surge handling in compact SMB packages.
FAQ
What is the maximum clamping voltage of SMBJ85AHE3/52 and under what test condition?
The SMBJ85AHE3/52 has a maximum clamping voltage (VC) of 137 V, measured at a peak pulse current (IPPM) of 4.4 A using the standardized 10/1000 µs double-exponential waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during surge events.
Is SMBJ85AHE3/52 qualified for automotive applications?
Yes, SMBJ85AHE3/52 is AEC-Q101 qualified, meaning it has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TC), unbiased highly accelerated stress test (UHAST), and human-body-model ESD (≥8 kV). The "HE3" suffix explicitly denotes RoHS-compliant and AEC-Q101 qualified commercial-grade construction.
What is the standoff voltage (VWM) and why is it critical for SMBJ85AHE3/52 selection?
The standoff voltage (VWM) of SMBJ85AHE3/52 is 85 V - the maximum DC or continuous reverse voltage the device can block without entering avalanche conduction. Selecting a VWM ≥110 % of the normal operating voltage prevents false triggering while ensuring sufficient margin for ripple and tolerance; for example, it's appropriate for 72–80 V nominal systems like 24 V automotive dual-battery architectures.
How does the thermal resistance of SMBJ85AHE3/52 affect its power handling in real PCB layouts?
SMBJ85AHE3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on minimum recommended 0.2" × 0.2" copper pads. In practice, this means a 5.0 W steady-state dissipation raises junction temperature by 500 °C above ambient - so actual usable power is limited by layout: doubling pad area reduces RθJA significantly, enabling higher duty-cycle operation without exceeding TJ(max) = +150 °C.
Can SMBJ85AHE3/52 be used in bidirectional configurations?
No, SMBJ85AHE3/52 is a unidirectional TVS diode, identified by the "A" suffix and cathode band marking. For bidirectional protection, Vishay specifies the "CA" suffix (e.g., SMBJ85CA); using SMBJ85AHE3/52 in reverse-biased AC applications would result in forward conduction and failure. Always match suffix to circuit polarity requirements.
SMBJ85AHE3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
SMBJ85AHE3/52 FAQ
1.How can I place an order for SMBJ85AHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AHE3/52 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 SMBJ85AHE3/52 reliable?
The price and inventory of SMBJ85AHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85AHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85AHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AHE3/52?
SMBJ85AHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AHE3/52 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 SMBJ85AHE3/52?
For technical support, including SMBJ85AHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AHE3/52 requirements.
6.How does Aetrix verify that SMBJ85AHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85AHE3/52 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 SMBJ85AHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85AHE3/52?
All SMBJ85AHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AHE3/52, 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 SMBJ85AHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ85AHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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