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Vishay General Semiconductor - Diodes Division SMBJ85-E3/5B
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- Part No.:
- SMBJ85-E3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85-E3/5B.pdf
- Description:
- TVS DIODE 85VWM 151VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,571
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Product details
Overview
SMBJ85-E3/5B 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 (IPPM), and 600 W peak pulse power (10/1000 μs waveform), used in industrial power supply input protection.
For engineers reviewing the SMBJ85-E3/5B datasheet, SMBJ85-E3/5B pinout, SMBJ85-E3/5B application, or SMBJ85-E3/5B equivalent, key selection criteria include clamping voltage margin vs. protected IC's absolute maximum rating, thermal derating above 25 °C, unidirectional polarity alignment with DC rail orientation, and PCB pad layout compliance with JEDEC DO-214AA footprint requirements.
Technical Context
This TVS operates as a silicon avalanche diode that remains high-impedance below VWM (85 V) and rapidly transitions to low-impedance conduction above VBR (min 94.4 V) to shunt transient energy. Its 137 V VC at 4.4 A ensures safe clamping of 10/1000 μs surges without exceeding downstream component voltage limits.
Thermal performance is defined by RθJA = 100 °C/W and RθJL = 20 °C/W, requiring copper pad area ≥ 5.0 mm × 5.0 mm per terminal for rated 600 W pulse handling. The device is RoHS-compliant (E3 suffix), commercial-grade, and meets MSL Level 1 (260 °C reflow peak).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before leakage exceeds 1.0 μA; sets upper limit for normal circuit operation. |
| VBR (min/max) | 94.4 V / 104 V at 1 mA - Confirmed breakdown range defining turn-on threshold; ensures reliable triggering above system nominal voltage. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 μs surge; must stay below protected device's absolute max rating. |
| PPPM | 600 W - Peak pulse power handling capability with standard 10/1000 μs waveform; defines transient energy absorption capacity. |
| ID @ VWM | ≤1.0 μA - Reverse leakage at 85 V; low value minimizes standby power loss and avoids false triggering. |
| TJ max. | +150 °C - Maximum junction temperature; determines thermal design margin under repetitive surge conditions. |
| Package | SMB (DO-214AA) - Standard surface-mount outline with cathode band marking; compatible with automated pick-and-place. |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with matte tin-plated leads, UL 94 V-0 rated compound, polarity indicated by cathode band on unidirectional types.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or return path; forms current path during reverse-biased transient clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., +85 V rail); band-marked end; conducts when line voltage exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power | Handles IEC 61000-4-5 Level 4 surges (4 kV open-circuit, 2 Ω source) on 24–48 V systems with margin. |
| Low clamping ratio (VC/VBR ≈ 1.45) | Minimizes overvoltage stress on downstream MOSFETs or controllers during fast transients. |
| MSL Level 1 moisture sensitivity | Enables standard SMT reflow without baking; supports high-yield automated assembly. |
| Glass passivated junction | Ensures stable VBR and low leakage over temperature and lifetime; critical for long-term reliability in industrial environments. |
| RoHS-compliant E3 suffix | Meets global environmental regulations; suitable for commercial and industrial products sold in EU, US, and Asia markets. |
Applications
| Industrial Power Supply Input Protection | Automotive Body Control Module (BCM) Power Rail |
|---|---|
|
Use Scenario: Protecting 85 V-rated DC input stage of programmable logic controller (PLC) power module against load dump and inductive switching spikes. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient overvoltage on main DC bus before it reaches buck converter IC and gate drivers. Use Value: Limits peak voltage to 137 V, staying 13 V below typical 150 V MOSFET drain-source rating, preventing catastrophic failure during 100 ms load dump events. |
Use Scenario: Safeguarding 12 V/24 V power input of BCM microcontroller and CAN transceiver from battery line transients during jump-start or alternator load dump. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed upstream of LDO regulators and communication ICs to suppress sub-μs spikes. Use Value: Sub-1 ns response time and 137 V clamping prevent latch-up or reset corruption in automotive microcontrollers operating at 5 V or 3.3 V rails. |
| Telecom AC-DC Adapter Output Stage | Industrial Sensor Signal Line Protection |
|
Use Scenario: Secondary-side overvoltage suppression on 85 V output of telecom rectifier module exposed to lightning-induced surges on distribution lines. IC Role / Device Role / Timing Role: Final-stage TVS on isolated DC output, coordinated with primary-side MOV and secondary-side Y-cap filtering. Use Value: 600 W rating absorbs residual energy passing through upstream filters; 1.0 μA leakage avoids loading precision feedback circuits. |
Use Scenario: Protecting analog input of 4–20 mA current loop transmitter connected to field wiring subject to ESD and cable discharge events. IC Role / Device Role / Timing Role: Low-capacitance (≈100 pF) unidirectional clamp on signal line referenced to local ground, limiting voltage to <150 V. Use Value: Prevents damage to op-amp input stages and ADC front-end while maintaining signal integrity due to minimal parasitic capacitance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85A-M3/5B | Halogen-free, RoHS-compliant variant; identical electrical specs and SMB package; same VWM, VBR, VC, and PPPM. | No functional difference; selected where halogen-free material compliance is required for final product certification. | Direct drop-in replacement if halogen-free bill-of-materials is mandated; no layout or validation changes needed. |
| SMCJ85A-E3/5B | Same VWM (85 V), higher PPPM (1500 W), larger SMC (DO-214AB) package; VC = 137 V at 11.0 A; RθJA = 40 °C/W. | Used where higher surge energy (e.g., IEC 61000-4-5 Level 5) or improved thermal dissipation is required. | Select when 600 W is insufficient; requires PCB footprint change and thermal pad redesign due to larger SMC outline. |
Compared with SMBJ85-E3/5B, SMBJ85A-M3/5B offers identical protection performance with halogen-free construction, while SMCJ85A-E3/5B delivers 2.5× higher surge power in a physically larger package-enabling robustness upgrades without changing circuit topology but requiring mechanical redesign.
Availability
SMBJ85-E3/5B is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, telecom adapters, and sensor interface designs requiring stable component supply across multi-year production cycles.
Supply support for SMBJ85-E3/5B 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, efficiency, and application-specific optimization.
The SMBJ series is engineered for high-energy transient suppression in space-constrained surface-mount applications, targeting industrial, automotive, and telecom systems where consistent clamping performance and AEC-Q101 readiness (in HE3 variants) are critical.
FAQ
What is the maximum clamping voltage of SMBJ85-E3/5B under standard test conditions?
The SMBJ85-E3/5B has a maximum clamping voltage (VC) of 137 V when subjected to its rated peak pulse current of 4.4 A using the 10/1000 μs waveform. This value is measured per IEC 61000-4-5 and ensures predictable overvoltage limiting for downstream components such as MOSFETs or controllers rated up to 150 V. The SMBJ85-E3/5B maintains this clamping performance across its specified operating temperature range.
Is SMBJ85-E3/5B suitable for automotive applications?
SMBJ85-E3/5B is RoHS-compliant and commercial-grade; it is not AEC-Q101 qualified. For automotive use, Vishay offers the SMBJ85HE3_B variant (with HE3 suffix), which is AEC-Q101 qualified and shares identical electrical characteristics. The SMBJ85-E3/5B itself is appropriate for non-safety-critical industrial or telecom applications where automotive qualification is not mandated.
How does the SMBJ85-E3/5B differ from bidirectional TVS diodes like SMBJ85CA?
The SMBJ85-E3/5B is unidirectional and functions only during reverse-bias transients, with polarity marked by a cathode band. In contrast, SMBJ85CA is bidirectional and clamps in both directions, making it suitable for AC lines or differential signal pairs. The SMBJ85-E3/5B offers lower leakage (<1.0 μA) and is preferred for DC power rails where polarity is fixed and leakage-sensitive circuits exist.
What PCB pad layout is recommended for optimal thermal performance of SMBJ85-E3/5B?
Vishay specifies mounting SMBJ85-E3/5B on 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal to achieve rated 600 W pulse power. Smaller pads cause thermal derating-e.g., at 75 °C ambient, power capability drops to ~3.5 W continuous. The SMBJ85-E3/5B's RθJA of 100 °C/W assumes this minimum copper area; reducing pad size increases junction temperature and reduces surge survivability.
Can SMBJ85-E3/5B be used in parallel for higher surge current handling?
Parallel connection of SMBJ85-E3/5B devices is not recommended due to parameter variation (VBR tolerance ±5 %) causing current imbalance and potential single-device failure. For higher surge ratings, select a single higher-power device such as SMCJ85A-E3/5B (1500 W) or SMAJ85A-E3/5B (400 W), both in compatible surface-mount packages. The SMBJ85-E3/5B is optimized for standalone use in compact layouts.
SMBJ85-E3/5B 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:
- 151V
- Current - Peak Pulse (10/1000µs):
- 4A
- Power - Peak Pulse:
- 600W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85-E3/5B FAQ
1.How can I place an order for SMBJ85-E3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85-E3/5B 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 SMBJ85-E3/5B reliable?
The price and inventory of SMBJ85-E3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85-E3/5B is usually 5 days.
3.What payment methods are accepted for SMBJ85-E3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85-E3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85-E3/5B?
SMBJ85-E3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85-E3/5B 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 SMBJ85-E3/5B?
For technical support, including SMBJ85-E3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85-E3/5B requirements.
6.How does Aetrix verify that SMBJ85-E3/5B is sourced from the original manufacturer or authorized distributors?
All SMBJ85-E3/5B 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 SMBJ85-E3/5B meets industry standards.
7.What is the process for return or replacement of SMBJ85-E3/5B?
All SMBJ85-E3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85-E3/5B, 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 SMBJ85-E3/5B part is unused and in its original packaging.
Return procedure for SMBJ85-E3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85-E3/5B Tags
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