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Vishay General Semiconductor - Diodes Division SMBJ85CAHE3/52
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- Part No.:
- SMBJ85CAHE3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CAHE3/52.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:8,123
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Product details
Overview
SMBJ85CAHE3/52 from Vishay General Semiconductor is a bidirectional surface-mount Transient Voltage Suppressor (TVS) diode in the SMB (DO-214AA) package, designed for clamping voltage transients on power and signal lines. It features a 85 V stand-off voltage (VWM), 137 V maximum clamping voltage (VC) at 4.4 A peak pulse current (IPPM), and 600 W peak pulse power dissipation with a 10/1000 µs waveform - used to protect MOSFETs, ICs, and sensor interfaces in industrial motor drives.
For engineers reviewing the SMBJ85CAHE3/52 datasheet, SMBJ85CAHE3/52 pinout, SMBJ85CAHE3/52 application, or SMBJ85CAHE3/52 equivalent, key selection criteria include bidirectional surge clamping capability, AEC-Q101 qualification status, thermal resistance (RθJA = 100 °C/W), and compatibility with automated SMT placement on 0.2" × 0.2" copper pads.
Technical Context
This device operates as a voltage-clamping protector with symmetrical breakdown behavior in both polarities due to its bidirectional construction. Its glass-passivated junction enables fast response time (<1 ns) and low incremental surge resistance, critical for suppressing ESD and lightning-induced transients per IEC 61000-4-2/4-5.
The SMBJ85CAHE3/52 is rated for repetitive 0.01% duty cycle surges and derates linearly above 25 °C ambient, with maximum junction temperature of +150 °C and storage range from –55 °C to +150 °C. It meets MSL Level 1 per J-STD-020 and is qualified to AEC-Q101 for automotive under-hood applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; defines safe operating margin below breakdown. |
| VBR min / max | 94.4 V / 104 V at IT = 1 mA - Confirmed bidirectional breakdown threshold range; ensures predictable turn-on during overvoltage events. |
| VC @ IPPM | 137 V at 4.4 A - Clamped voltage under 10/1000 µs surge; determines maximum stress imposed on protected downstream circuitry. |
| PPPM | 600 W - Peak pulse power handling capacity; supports robust protection against IEC 61000-4-5 Level 4 surges (4 kV line-to-line). |
| IPPM | 4.4 A - Peak surge current capability with 10/1000 µs waveform; defines minimum trace width and PCB pad sizing requirements. |
| RθJA | 100 °C/W - Junction-to-ambient thermal resistance; requires ≥0.2" × 0.2" copper pad per terminal for rated power dissipation. |
| TJ max | +150 °C - Maximum junction temperature; enables operation in under-hood automotive environments without derating. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, bidirectional configuration with no polarity marking. Dimensions: 4.57 mm × 3.94 mm × 2.20 mm (L × W × H); matte tin-plated leads, solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; common node for bidirectional conduction path | Connected to line being protected; forms symmetrical clamping path with cathode during either polarity transient. |
| Cathode | Current exit point in forward bias; common node for bidirectional conduction path | Connected to reference plane (e.g., ground or rail); completes low-impedance surge shunt path during overvoltage events. |
Key Features
| Feature | Design Value |
|---|---|
| 600 W peak pulse power (10/1000 µs) | Enables compliance with IEC 61000-4-5 surge immunity up to 4 kV in industrial and automotive systems. |
| AEC-Q101 qualified (HE3 suffix) | Validated for automotive under-hood use including engine control units and body electronics with extended temperature cycling. |
| Low profile SMB (DO-214AA) package | Supports high-density PCB layouts and automated pick-and-place assembly with standard SMT reflow profiles. |
| Glass passivated junction | Ensures stable leakage performance (<1 µA at VWM) and long-term reliability under humidity and thermal stress. |
| MSL Level 1 rating | Allows unlimited floor life and direct reflow without baking; simplifies manufacturing logistics and inventory management. |
Applications
| Industrial Motor Drives | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Protection of gate drivers and microcontroller I/O lines against inductive kickback from relay coils and solenoid loads. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across power rails or signal inputs to limit transient excursions below IC absolute maximum ratings. Use Value: Prevents latch-up and permanent damage to 3.3 V/5 V logic interfaces while maintaining signal integrity during 100 V–200 V switching transients. |
Use Scenario: Surge suppression on LIN bus lines and sensor supply rails exposed to load dump and jump-start conditions. IC Role / Device Role / Timing Role: Fast-response TVS connected between LIN line and ground to clamp ESD and ISO 7637-2 pulse 1/2a/5a transients. Use Value: Maintains communication continuity during 100 V/50 ms load dump events by limiting voltage to <137 V at the transceiver input. |
| Telecom Power Supplies | Consumer Appliance Control Boards |
|
Use Scenario: Input-stage protection of AC-DC adapters and PoE injectors against lightning-induced surges on primary-side DC bus. IC Role / Device Role / Timing Role: Primary-side clamping device placed across bulk capacitor terminals to absorb energy from differential-mode surges. Use Value: Absorbs 600 W peak pulses without degradation, extending capacitor lifetime and avoiding secondary-side regulator failure. |
Use Scenario: ESD protection for touch panel interfaces and microcontroller reset lines in washing machines and HVAC controllers. IC Role / Device Role / Timing Role: Low-capacitance bidirectional clamp on 3.3 V I²C or GPIO lines to suppress human-body-model (HBM) discharges. Use Value: Limits transient voltage to <137 V within <1 ns, preventing false resets and firmware corruption during field service. |
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-M3/52 | Halogen-free, RoHS-compliant, commercial-grade version without AEC-Q101 qualification | Not suitable for automotive under-hood deployment; limited to industrial and consumer applications | Select when AEC-Q101 is not required and halogen-free compliance is mandated by end-product environmental policy. |
| SMCJ85CAHE3/52 | Larger SMC (DO-214AB) package with higher 1500 W PPPM, same VWM/VC ratings | Requires larger PCB footprint and higher thermal mass; suited for higher-energy surge environments | Choose when system-level surge testing exceeds IEC 61000-4-5 Level 4 and 600 W is insufficient for margin. |
Compared with SMBJ85CA-M3/52, the SMBJ85CAHE3/52 adds AEC-Q101 qualification and tighter process controls for automotive use; compared with SMCJ85CAHE3/52, it trades 2.5× lower surge power for 40% smaller board area and faster assembly throughput.
Availability
SMBJ85CAHE3/52 is available at Aetrix Electronics and suitable for industrial motor drives, automotive body control modules, and telecom power supplies requiring stable component supply with AEC-Q101 validation and full traceability.
Supply support for SMBJ85CAHE3/52 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, and protection devices with emphasis on reliability, precision, and application-specific qualification.
The SMBJ series is engineered for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where consistent clamping performance and long-term stability are critical.
FAQ
What is the clamping voltage of SMBJ85CAHE3/52 at its rated peak pulse current?
The SMBJ85CAHE3/52 has a maximum clamping voltage (VC) of 137 V at 4.4 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is measured under standardized test conditions and defines the upper voltage limit imposed on protected circuitry during surge events. The SMBJ85CAHE3/52 maintains this clamping performance across its full operating temperature range from –55 °C to +150 °C.
Is SMBJ85CAHE3/52 suitable for automotive applications?
Yes, SMBJ85CAHE3/52 is AEC-Q101 qualified and specifically intended for automotive applications including body control modules, lighting systems, and infotainment power rails. The HE3 suffix denotes RoHS-compliant and AEC-Q101-qualified construction, validated for temperature cycling, mechanical shock, and humidity exposure per automotive standards. The SMBJ85CAHE3/52 meets MSL Level 1 and supports reflow without preconditioning.
How does SMBJ85CAHE3/52 differ from unidirectional SMBJ85AHE3/52?
The SMBJ85CAHE3/52 is bidirectional with symmetrical breakdown in both polarities, while the unidirectional SMBJ85AHE3/52 conducts only in reverse bias and requires correct polarity orientation. The "CA" suffix indicates bidirectional operation with no cathode band marking, enabling use on AC-coupled or floating signal lines. Both share identical VWM (85 V), VC (137 V), and PPPM (600 W), but only SMBJ85CAHE3/52 protects against transients of either polarity without external circuit redesign.
What is the thermal resistance of SMBJ85CAHE3/52, and how does it affect layout?
The SMBJ85CAHE3/52 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. This value directly impacts PCB layout: smaller pads increase thermal impedance and reduce allowable surge repetition rate. To maintain rated 600 W pulse power, designers must allocate minimum copper area per pad and avoid excessive trace length between the SMBJ85CAHE3/52 and ground/power planes.
Does SMBJ85CAHE3/52 require special handling or moisture sensitivity precautions?
No - SMBJ85CAHE3/52 is rated MSL Level 1 per J-STD-020, meaning it has unlimited floor life and may be placed directly into reflow ovens without baking or dry-packaging. Its matte tin-plated leads comply with J-STD-002 and JESD 22-B102 for solderability, and the molding compound meets UL 94 V-0 flammability rating. These characteristics simplify manufacturing integration and reduce process risk for the SMBJ85CAHE3/52.
SMBJ85CAHE3/52 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:
- -
- Bidirectional Channels:
- 1
- 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)
SMBJ85CAHE3/52 FAQ
1.How can I place an order for SMBJ85CAHE3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CAHE3/52 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 SMBJ85CAHE3/52 reliable?
The price and inventory of SMBJ85CAHE3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CAHE3/52 is usually 5 days.
3.What payment methods are accepted for SMBJ85CAHE3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CAHE3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CAHE3/52?
SMBJ85CAHE3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CAHE3/52 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 SMBJ85CAHE3/52?
For technical support, including SMBJ85CAHE3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CAHE3/52 requirements.
6.How does Aetrix verify that SMBJ85CAHE3/52 is sourced from the original manufacturer or authorized distributors?
All SMBJ85CAHE3/52 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 SMBJ85CAHE3/52 meets industry standards.
7.What is the process for return or replacement of SMBJ85CAHE3/52?
All SMBJ85CAHE3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CAHE3/52, 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 SMBJ85CAHE3/52 part is unused and in its original packaging.
Return procedure for SMBJ85CAHE3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CAHE3/52 Tags
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