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Vishay General Semiconductor - Diodes Division SMBJ85A-E3/52
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- Part No.:
- SMBJ85A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85A-E3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,190
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Product details
Overview
SMBJ85A-E3/52 from Vishay General Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in 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 capability with 10/1000 µs waveform.
For engineers reviewing the SMBJ85A-E3/52 datasheet, SMBJ85A-E3/52 pinout, SMBJ85A-E3/52 application, or SMBJ85A-E3/52 equivalent, key selection considerations include its unidirectional polarity, 1.0 µA max reverse leakage at VWM, -55 °C to +150 °C operating junction temperature range, and RoHS-compliant commercial-grade construction with matte tin-plated leads.
Technical Context
This TVS diode operates as a clamping device in parallel with protected circuitry, conducting only when transient voltage exceeds its breakdown threshold. Its glass-passivated junction ensures stable avalanche characteristics, low incremental surge resistance, and fast response time (<1 ns), enabling effective suppression of ESD, EFT, and surge events per IEC 61000-4-2/4-4/4-5.
The SMBJ85A-E3/52 is rated for 600 W peak pulse power (10/1000 µs), derates linearly above 25 °C ambient with RθJA = 100 °C/W, and supports repetitive surge duty cycle ≤ 0.01 %. Its cathode-band marking identifies polarity, 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 begins; defines safe signal line operating margin. |
| VBR min/max | 94.4 V / 104 V at 1 mA - Confirmed avalanche onset range; ensures predictable turn-on under transient stress. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage during 10/1000 µs surge; determines maximum stress imposed on downstream ICs. |
| PPPM | 600 W - Peak transient energy absorption capacity; enables protection against IEC 61000-4-5 Level 4 surges (4 kV line-earth). |
| ID @ VWM | 1.0 µA max - Ultra-low reverse leakage; minimizes standby power loss and avoids false triggering in high-impedance circuits. |
| TJ max | +150 °C - Maximum junction temperature rating; supports operation in automotive under-hood and industrial control environments. |
| Package | SMB (DO-214AA) - Standardized surface-mount outline with 5.59 mm × 4.06 mm footprint; compatible with automated pick-and-place and reflow soldering. |
Pinout & Package
SMBJ85A-E3/52 uses the SMB (DO-214AA) package: molded plastic case with matte tin-plated leads, 0.220" × 0.160" (5.59 mm × 4.06 mm) body, cathode band marking on one end. Mounting requires 0.2" × 0.2" (5.0 mm × 5.0 mm) copper pads per terminal per Vishay recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side connection point | Connected to ground or low-voltage reference; completes conduction path during transient clamping. |
| Cathode | High-side connection point | Connected to protected line (e.g., power rail or signal); polarity band denotes this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables robust protection against high-energy surges without thermal runaway under defined test conditions. |
| Glass passivated chip junction | Ensures stable, repeatable avalanche behavior over lifetime and across temperature extremes (-55 °C to +150 °C). |
| MSL Level 1, 260 °C peak reflow | Supports standard lead-free SMT assembly without moisture-induced damage or popcorn effect. |
| RoHS-compliant, commercial grade (E3 suffix) | Meets global environmental regulations; suitable for consumer, industrial, and telecom equipment with no halogen restrictions. |
| Low incremental surge resistance | Minimizes voltage overshoot during fast-rising transients, improving clamping precision and system-level immunity. |
Applications
| Industrial Motor Drives | Automotive Power Distribution |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontrollers in 24 V DC motor control modules exposed to inductive kickback from relay coils and solenoids. IC Role / Device Role / Timing Role: Unidirectional TVS placed across MOSFET gate-source or supply rail to clamp voltage spikes below IC absolute maximum ratings. Use Value: Limits transient voltage to ≤137 V during 4.4 A surge, preventing latch-up or oxide breakdown in 3.3 V/5 V logic interfaces. |
Use Scenario: Surge suppression on 12 V battery-fed infotainment and body control module inputs subjected to load dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary front-end clamping device on power input lines upstream of DC-DC converters and LDOs. Use Value: Withstands 600 W peak pulse energy while maintaining <1.0 µA leakage at 85 V, preserving quiescent current budget in always-on systems. |
| Telecom Power Interfaces | Industrial Sensor Signal Lines |
|
Use Scenario: Input protection for PoE-powered Ethernet switches and base station power supplies facing AC line transients and lightning-induced surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on primary DC input rails (e.g., 48 V or 57 V systems) to absorb differential-mode surges. Use Value: 85 V VWM provides 12 V margin above nominal 48 V telecom rail, ensuring no conduction during normal operation while clamping at 137 V. |
Use Scenario: ESD and surge protection for analog sensor outputs (e.g., 4–20 mA loops, RTD bridges) in factory automation PLC I/O modules. IC Role / Device Role / Timing Role: Low-capacitance unidirectional clamp on signal lines referenced to local ground, minimizing signal distortion. Use Value: Sub-µA leakage preserves accuracy of high-impedance sensor measurements; fast response prevents transient coupling into ADC front-ends. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85CA-E3/52 | Bidirectional variant with same VWM (85 V), symmetric clamping in both polarities; higher ID (2.0 µA) due to dual-junction structure. | Required where AC-coupled or floating signal lines need protection against both positive and negative transients (e.g., RS-485, CAN bus). | Select SMBJ85CA-E3/52 only if bidirectional clamping is mandated; SMBJ85A-E3/52 is optimal for DC rails with defined polarity. |
| SMAJ85A-E3/52 | Same electrical specs but in smaller SMA (DO-214AC) package; lower PPPM (400 W), reduced thermal mass, RθJA = 140 °C/W. | Suitable for space-constrained designs with lower surge threat levels; not recommended for repeated 600 W surges or high-ambient environments. | Choose SMAJ85A-E3/52 only when PCB area is critical and surge exposure is limited to IEC 61000-4-2 Level 3; SMBJ85A-E3/52 offers superior thermal and power handling. |
Compared with SMBJ85CA-E3/52 and SMAJ85A-E3/52, SMBJ85A-E3/52 delivers higher surge robustness (600 W vs. 400 W), better thermal performance (RθJA = 100 °C/W), and lower leakage-making it the preferred choice for demanding DC power rail protection where unidirectional clamping suffices.
Availability
SMBJ85A-E3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive power distribution, and telecom power interfaces requiring stable component supply, long-term lifecycle support, and traceable RoHS-compliant sourcing.
Supply support for SMBJ85A-E3/52 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, efficiency, and application-specific optimization.
The SMBJ series was developed for high-power, surface-mount transient suppression in harsh environments-targeting automotive, industrial, and telecom systems where compact size, high surge rating, and consistent clamping performance are critical.
FAQ
What is the clamping voltage of SMBJ85A-E3/52 at its rated peak pulse current?
The SMBJ85A-E3/52 has a maximum clamping voltage (VC) of 137 V when subjected to its specified peak pulse current (IPPM) of 4.4 A under the 10/1000 µs waveform condition. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ85A-E3/52 maintains this clamping performance across its full operating temperature range.
Is SMBJ85A-E3/52 suitable for automotive applications?
SMBJ85A-E3/52 is RoHS-compliant and qualified to AEC-Q101 when ordered with HE3 or HM3 suffixes (e.g., SMBJ85AHE3). The base SMBJ85A-E3/52 is commercial-grade and not AEC-Q101 certified; for automotive use, specify the HE3 variant. The SMBJ85A-E3/52 itself supports the required -55 °C to +150 °C junction temperature range but lacks the extended qualification testing required for automotive deployment.
How does the SMBJ85A-E3/52 differ from the SMBJ85CA-E3/52?
The SMBJ85A-E3/52 is unidirectional, with cathode-band marking and clamping only for positive transients relative to its anode. The SMBJ85CA-E3/52 is bidirectional, offering symmetrical clamping for both polarities without polarity marking. Their VWM and VC values are identical, but SMBJ85CA-E3/52 exhibits higher reverse leakage (2.0 µA vs. 1.0 µA) and is intended for AC or floating signal lines. SMBJ85A-E3/52 remains the correct choice for DC power rail protection.
What is the thermal resistance of SMBJ85A-E3/52, and how does it affect power dissipation?
The SMBJ85A-E3/52 has a typical junction-to-ambient thermal resistance (RθJA) of 100 °C/W when mounted on 0.2" × 0.2" copper pads. This means each watt of sustained power dissipation raises the junction temperature by ~100 °C above ambient. Since its steady-state power dissipation (PD) is rated at 5.0 W at TA = 50 °C, proper PCB copper area and airflow are essential to avoid exceeding the +150 °C maximum junction temperature-especially during repetitive surge events.
Can SMBJ85A-E3/52 be used in place of SMAJ85A-E3/52?
SMBJ85A-E3/52 and SMAJ85A-E3/52 share identical electrical parameters (VWM, VBR, VC, IPPM), but differ in package: SMBJ uses DO-214AA (larger, higher thermal mass), SMAJ uses DO-214AC (smaller, lower surge rating). SMBJ85A-E3/52 supports 600 W peak pulse power; SMAJ85A-E3/52 is rated for 400 W. Substituting SMBJ85A-E3/52 for SMAJ85A-E3/52 is physically and electrically acceptable-and improves surge robustness-but requires verifying PCB pad layout compatibility with the larger SMB footprint.
SMBJ85A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Package/Case:
- DO-214AA, SMB
- Series:
- TransZorb®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBJ85A-E3/52 FAQ
1.How can I place an order for SMBJ85A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85A-E3/52 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 SMBJ85A-E3/52 reliable?
The price and inventory of SMBJ85A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85A-E3/52?
SMBJ85A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85A-E3/52 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 SMBJ85A-E3/52?
For technical support, including SMBJ85A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85A-E3/52 requirements.
6.How does Aetrix verify that SMBJ85A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85A-E3/52 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 SMBJ85A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85A-E3/52?
All SMBJ85A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85A-E3/52, 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 SMBJ85A-E3/52 part is unused and in its original packaging.
Return procedure for SMBJ85A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85A-E3/52 Tags
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