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Diodes Incorporated SMBJ85CA-13-F
- Part No.:
- SMBJ85CA-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA-13-F.pdf
- Description:
- TVS DIODE 85VWM 137VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:5,668
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Product details
Overview
SMBJ85CA-13-F from Diodes Incorporated is a bi-directional transient voltage suppressor (TVS) diode in SMB package, rated for 600W peak pulse power, 85V reverse standoff voltage (VRWM), 137V maximum clamping voltage (VC) at 4.4A peak pulse current, and designed for overvoltage protection of DC power rails and data lines in industrial control and automotive electronics.
For engineers reviewing the SMBJ85CA-13-F datasheet, SMBJ85CA-13-F pinout, SMBJ85CA-13-F application, or SMBJ85CA-13-F equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, unidirectional vs. bi-directional polarity requirements, thermal derating above +25°C, and compatibility with 8.3ms surge waveforms per IEC 61000-4-5.
Technical Context
This bi-directional TVS operates symmetrically across both polarities, enabling robust protection against ESD, lightning-induced surges, and inductive switching transients without requiring polarity-aware PCB layout. Its glass-passivated junction ensures stable breakdown characteristics and low leakage under 5μA at VRWM.
The device features a 1.0mA test current for breakdown voltage verification, 137V clamping at 4.4A IPP, and thermal derating of 4.8W/°C above +25°C ambient - critical for sustained surge handling in enclosed enclosures or high-temperature environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - withstands single 8.3ms half-sine surges up to 4.4A without failure |
| Reverse Standoff Voltage | 85V - maximum continuous DC or RMS voltage before clamping initiates |
| Breakdown Voltage | 94.4–108.2V @ 1.0mA - defines onset of avalanche conduction with tight tolerance |
| Clamping Voltage | 137V @ 4.4A - limits voltage seen by downstream circuitry during surge event |
| Leakage Current | <5.0μA @ 85V - negligible standby power loss and signal integrity impact |
| Operating Temperature | −55°C to +150°C - supports deployment in under-hood automotive or industrial motor drive environments |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, molded plastic case with UL 94V-0 flammability rating, 0.1g mass, and matte tin lead finish compliant with RoHS and halogen-free requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode / Cathode (Bi-directional) | Surge current path (symmetrical) | No polarity marking; terminals interchangeable - simplifies layout and eliminates orientation errors |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power | Enables protection against IEC 61000-4-5 Level 4 (4kV/2Ω) surges on 24V/48V industrial buses |
| Glass-passivated die construction | Ensures long-term stability of breakdown voltage and low parametric drift over temperature and life |
| Bi-directional configuration | Protects AC-coupled signals or bidirectional data lines (e.g., RS-485, CAN FD) without external polarity logic |
| Lead-free, halogen-free "Green" design | Meets IPC-J-STD-020 moisture sensitivity Level 1 and global environmental compliance mandates |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24V DC input channels on programmable logic controller modules exposed to load dump and relay coil flyback. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of input conditioning circuitry and isolation amplifiers. Use Value: Limits transient voltage to ≤137V, preserving integrity of 30V-rated front-end op-amps and ADC drivers. |
Use Scenario: LIN bus and sensor supply lines in body control units subject to ISO 7637-2 Pulse 1/2a/5a transients. IC Role / Device Role / Timing Role: Secondary protection stage after primary LC filter, absorbing residual energy not attenuated by passive components. Use Value: Clamps 100V load dump spikes to safe levels within 1ns response time, preventing latch-up in microcontroller I/O cells. |
| RS-485 Transceiver Interface | Smart Meter Power Input |
Use Scenario: Differential data lines in utility-grade RS-485 networks deployed in outdoor substations. IC Role / Device Role / Timing Role: Bi-directional TVS placed across A/B lines and referenced to ground, suppressing common-mode surges. Use Value: Symmetric clamping maintains differential signal integrity while limiting common-mode excursion to <140V. |
Use Scenario: 230VAC-derived 12V DC power rail in residential smart meters exposed to grid switching transients. IC Role / Device Role / Timing Role: Final-stage surge clamp after bridge rectifier and bulk capacitor, protecting DC-DC converter inputs. Use Value: Absorbs 600W surges without degradation, ensuring >10-year field reliability under repeated 1kV/500A surge stress. |
Availability
SMBJ85CA-13-F is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive body control modules, and RS-485 transceiver interface applications requiring stable component supply and full traceability.
Supply support for SMBJ85CA-13-F 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability protection, power management, and signal integrity solutions for industrial, automotive, and computing markets.
The SMBJ series is engineered specifically for board-level transient suppression in harsh electromagnetic environments, balancing high surge capability with compact SMB footprint and consistent clamping performance across temperature.
FAQ
What does the 'C' suffix in SMBJ85CA-13-F indicate?
The 'C' denotes bi-directional functionality: the device clamps transient voltages symmetrically across both polarities, making it suitable for AC signals, differential buses like RS-485, or any application where polarity reversal may occur. Unlike unidirectional variants, it has no cathode band marking and requires no orientation during placement.
How does SMBJ85CA-13-F compare to SMAJ85CA in surge handling?
SMBJ85CA-13-F delivers 600W peak pulse power in the larger SMB package, whereas SMAJ85CA (SMA package) is rated for 400W. The SMB variant sustains higher surge currents (4.4A vs. 2.9A) and offers superior thermal dissipation due to greater copper pad area and lower thermal resistance - critical for repeated surge events in industrial settings.
Is SMBJ85CA-13-F compatible with lead-free reflow profiles?
Yes - it is qualified for standard lead-free reflow per JEDEC J-STD-020, with moisture sensitivity level 1 (MSL-1), meaning unlimited floor life at ≤30°C/60% RH. Its matte tin finish ensures reliable solder wetting at peak temperatures up to 260°C, and its UL 94V-0 mold compound resists delamination during thermal cycling.
Can SMBJ85CA-13-F be used for ESD protection per IEC 61000-4-2?
Yes - it meets IEC 61000-4-2 Level 4 (±15kV contact, ±20kV air) for system-level ESD immunity when placed at board edges or connector interfaces. Its sub-nanosecond response time and low dynamic impedance ensure rapid clamping, though for IC-level protection, dedicated low-capacitance ESD arrays are recommended upstream of sensitive pins.
SMBJ85CA-13-F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SMBJ85CA-13-F FAQ
1.How can I place an order for SMBJ85CA-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA-13-F 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 SMBJ85CA-13-F reliable?
The price and inventory of SMBJ85CA-13-F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CA-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ85CA-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA-13-F?
SMBJ85CA-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA-13-F 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 SMBJ85CA-13-F?
For technical support, including SMBJ85CA-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA-13-F requirements.
6.How does Aetrix verify that SMBJ85CA-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA-13-F 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 SMBJ85CA-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ85CA-13-F?
All SMBJ85CA-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA-13-F, 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 SMBJ85CA-13-F part is unused and in its original packaging.
Return procedure for SMBJ85CA-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85CA-13-F Tags
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