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Diodes Incorporated SMBJ85A-13-F
- Part No.:
- SMBJ85A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85A-13-F.pdf
- Description:
- TVS DIODE 85VWM 137VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,263
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Product details
Overview
SMBJ85A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode with 85V reverse standoff voltage, 94.4V minimum breakdown voltage at 1mA, 137V maximum clamping voltage at 4.4A peak pulse current, and SMB package. It protects DC power rails in industrial motor drives against IEC 61000-4-5 surge events.
For engineers reviewing the SMBJ85A-13-F datasheet, SMBJ85A-13-F pinout, SMBJ85A-13-F application, or SMBJ85A-13-F equivalent, key selection criteria include clamping voltage margin relative to system operating voltage, peak pulse current capability under 8.3ms half-sine waveform, thermal derating above +25°C, and RoHS-compliant lead-free plating for reflow compatibility.
Technical Context
This TVS operates as a unidirectional avalanche clamp, triggered when reverse voltage exceeds VRWM = 85V and fully clamps at VC = 137V under IPP = 4.4A (8.3ms half-sine). Its glass-passivated die ensures stable breakdown characteristics and low leakage (IR ≤ 5.0μA at VRWM).
Thermal performance is defined by PM(AV) = 5.0W at TL = +75°C, with linear derating of 4.8W/°C above +25°C ambient, and operational junction temperature range from –55°C to +150°C - enabling use in high-temperature industrial enclosures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 8.3ms surges per IEC 61000-4-5 Level 4 without failure |
| Reverse Standoff Voltage (VRWM) | 85V - maximum continuous DC voltage before significant leakage; sets upper limit for protected rail |
| Breakdown Voltage (VBR) | 94.4–108.2V @ 1mA - defines onset of avalanche conduction; must exceed VRWM by ≥11% |
| Clamping Voltage (VC) | 137V @ IPP = 4.4A - peak voltage seen by downstream circuit during surge; determines required IC overvoltage margin |
| Peak Pulse Current (IPP) | 4.4A - maximum surge current handled at rated clamping voltage; derived from PPK / VC |
| Operating Temperature | –55°C to +150°C - supports deployment in automotive engine bays and industrial PLC backplanes |
| Package | SMB - standardized surface-mount outline (5.00–5.59mm length, 3.30–3.94mm width) with matte tin terminals |
Pinout & Package
Package: SMB (Surface-Mount Small Outline), molded plastic case rated UL 94V-0, 0.1g weight, moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (banded end) | Surge current sink node | Connected to protected line; conducts avalanche current to ground during overvoltage |
| Anode | Reference/return path | Typically tied to system ground; completes clamping path during transient events |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse power | Enables compliance with IEC 61000-4-5 surge immunity up to 4kV (line-to-earth) in compact SMB footprint |
| Glass-passivated die construction | Ensures stable VBR tolerance (±5% typical), low parameter drift over temperature and lifetime |
| Lead-free, RoHS-compliant plating | Matte tin finish meets JEDEC J-STD-020 reflow profiles and eliminates Pb-related reliability concerns |
| Uni-directional configuration | Provides asymmetric protection ideal for DC power inputs where reverse polarity is not expected |
Applications
| Industrial Motor Drives | Programmable Logic Controllers |
|---|---|
Use Scenario: Protection of 24V/48V DC input terminals against load dump and inductive kickback in servo drive power supplies. IC Role / Device Role / Timing Role: Transient voltage suppressor placed directly at connector entry point, clamping surges before reaching DC-DC converters. Use Value: Limits voltage excursion to ≤137V, preserving 150V-rated input capacitors and MOSFETs downstream. |
Use Scenario: Surge suppression on 24V auxiliary power rail feeding digital I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Fast-response unidirectional TVS absorbing 8.3ms surges induced by relay coil switching and ESD events. Use Value: Maintains <5μA leakage at 24V nominal, preventing false triggering of optocouplers or logic inputs. |
| Telecom Power Feeds | Renewable Energy Inverters |
Use Scenario: Input protection for remote radio head (RRH) power interfaces exposed to lightning-induced surges on outdoor cabling. IC Role / Device Role / Timing Role: Primary clamping device on –48V DC feed line, coordinated with upstream gas discharge tube (GDT). Use Value: Clamps within 1ns response time to protect sensitive RF front-end bias circuits from >1kV transients. |
Use Scenario: DC bus protection in solar string inverters where PV array wiring introduces long-line surge coupling. IC Role / Device Role / Timing Role: Secondary TVS on 600–1000V DC link, limiting overvoltage spikes during rapid MPPT transitions or grid faults. Use Value: Withstands 150°C junction temperature during sustained high-ambient operation in rooftop enclosures. |
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-13-F | Bi-directional version; symmetric clamping for AC-coupled or bidirectional signal lines | Required where reverse polarity surges or AC signals (e.g., RS-485) need protection | Select only if bidirectional clamping is needed; otherwise unidirectional SMBJ85A-13-F offers tighter leakage control |
| SAC85-13-F | Same VRWM and VC but in SMC package; 1.5× higher IPP (6.6A) due to larger thermal mass | Better suited for repeated surge exposure or higher ambient temperatures (>85°C) | Choose SAC85-13-F when system-level testing reveals marginal clamping margin or thermal derating limits |
Compared with SMBJ85CA-13-F and SAC85-13-F, SMBJ85A-13-F provides optimal cost and board space efficiency for unidirectional DC rail protection where peak surge energy is bounded and thermal environment is controlled.
Availability
SMBJ85A-13-F is available at Aetrix Electronics and suitable for industrial motor drives, programmable logic controllers, and telecom power feeds requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ85A-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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
SMBJxxA series belongs to Diodes' transient voltage suppressor portfolio, engineered specifically for robust, surface-mount surge protection in industrial, telecom, and automotive power systems.
FAQ
What is the maximum clamping voltage of SMBJ85A-13-F under standard test conditions?
The maximum clamping voltage (VC) is 137V, measured at a peak pulse current (IPP) of 4.4A using an 8.3ms half-sine waveform per IEC 61000-4-5. This value is guaranteed across the full operating temperature range and represents the highest voltage imposed on protected circuitry during a surge event.
Is SMBJ85A-13-F suitable for protecting a 72V DC battery system?
No - SMBJ85A-13-F has a reverse standoff voltage (VRWM) of 85V, leaving only 13V margin above 72V nominal. For reliable operation, VRWM should be ≥1.2× system max operating voltage. A part like SMBJ90A-13-F (VRWM = 90V) is recommended to ensure adequate margin and avoid premature leakage or thermal runaway.
Does SMBJ85A-13-F require a heatsink in typical PCB layouts?
No external heatsink is required. Its steady-state power dissipation is limited to 5.0W at TL = +75°C, and it relies on PCB copper area for thermal conduction. Standard 1oz copper with ≥100mm² thermal pad per terminal meets JEDEC JESD51-3 requirements for natural convection cooling in most industrial applications.
How does the SMBJ85A-13-F differ from the older SMBJ85A-13?
The "-F" suffix denotes Diodes Incorporated's standard RoHS-compliant, halogen- and antimony-free "Green" packaging with matte tin plating. The non-"-F" variant uses legacy plating that may contain lead or restricted substances, and is no longer manufactured or supported for new designs per Diodes' product change notice PCN-2015-001.
SMBJ85A-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:
- 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:
- SMB
SMBJ85A-13-F FAQ
1.How can I place an order for SMBJ85A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85A-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 SMBJ85A-13-F reliable?
The price and inventory of SMBJ85A-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 SMBJ85A-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ85A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85A-13-F?
SMBJ85A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85A-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 SMBJ85A-13-F?
For technical support, including SMBJ85A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85A-13-F requirements.
6.How does Aetrix verify that SMBJ85A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ85A-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 SMBJ85A-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ85A-13-F?
All SMBJ85A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85A-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 SMBJ85A-13-F part is unused and in its original packaging.
Return procedure for SMBJ85A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85A-13-F Tags
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