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Diodes Incorporated SMBJ8.5A-13-F
- Part No.:
- SMBJ8.5A-13-F
- Manufacturer:
- Diodes Incorporated
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5A-13-F.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC SMB
- Quantity:
- Payment:
- Shipping:
Inventory:7,211
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Product details
Overview
SMBJ8.5A-13-F from Diodes Incorporated is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for primary overvoltage protection in DC power rails and signal lines. It features a 8.5V reverse standoff voltage (VRWM), 9.44–10.82V breakdown voltage (VBR) at 1mA, 14.4V maximum clamping voltage (VC) at 41.7A peak pulse current, and operates across –55°C to +150°C junction temperature range - deployed in industrial power supplies and automotive body control modules.
For engineers reviewing the SMBJ8.5A-13-F datasheet, SMBJ8.5A-13-F pinout, SMBJ8.5A-13-F application, or SMBJ8.5A-13-F equivalent, key selection criteria include clamping performance under 8.3ms surge, unidirectional polarity handling, SMB package thermal dissipation limits, and RoHS-compliant lead-free plating compatibility with automated reflow processes.
Technical Context
This TVS diode uses glass-passivated silicon die construction to achieve stable breakdown characteristics and low leakage (<10µA at VRWM). Its unidirectional configuration provides asymmetric conduction: low forward voltage (~3.5V at 35A) during positive surges and high reverse impedance below VRWM.
The device responds to transients per the 10/1000µs waveform standard (per REA), delivering 600W peak pulse power with derating above +25°C (4.8W/°C). Clamping occurs within nanoseconds, limiting voltage overshoot to ≤14.4V at 41.7A IPP - critical for safeguarding 12V-rated ICs such as CAN transceivers and microcontroller I/O pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power | 600W - sustains single 8.3ms half-sine surge without failure; defines maximum energy absorption capability. |
| Reverse Standoff Voltage (VRWM) | 8.5V - maximum continuous DC or RMS voltage before significant leakage; sets operating margin for 12V systems. |
| Breakdown Voltage (VBR) | 9.44–10.82V @ 1mA - guaranteed conduction onset range; ensures reliable triggering before downstream component damage. |
| Clamping Voltage (VC) | 14.4V @ 41.7A - maximum voltage seen by protected circuit during rated surge; must be below IC absolute max ratings. |
| Peak Pulse Current (IPP) | 41.7A - peak current handled at VC; determines survivability against ISO 7637-2 Pulse 1/2a/5a transients. |
| Junction Temperature Range | –55°C to +150°C - supports operation in under-hood automotive and industrial environments with minimal derating. |
| Package | SMB (DO-214AA) - standardized 3.94 × 4.57 × 2.21 mm outline with 0.15–0.31 mm lead thickness; compatible with IPC-7351B footprint. |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, unidirectional configuration with cathode band marking on one end. Molded plastic case (UL 94V-0), matte tin-plated terminals, 0.1g weight.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path | Connected to ground or low-impedance reference; completes clamping loop during positive transients. |
| Cathode | Protected line connection | Connected to input rail (e.g., 12V supply); blocks reverse current until VBR exceeded. |
Key Features
| Feature | Design Value |
|---|---|
| 600W peak pulse rating | Enables robust protection against severe load dump and inductive switching events in 12V systems. |
| Glass-passivated die | Ensures stable VBR tolerance and long-term reliability under thermal cycling and humidity stress. |
| Lead-free, RoHS-compliant finish | Meets JEDEC J-STD-020 moisture sensitivity Level 1; supports Pb-free reflow without delamination. |
| Low clamping ratio (VC/VRWM ≈ 1.69) | Minimizes protected circuit overvoltage margin while maintaining fast response time (<1ns). |
Applications
| Automotive Body Control Module | Industrial PLC Digital Input |
|---|---|
Use Scenario: Protects microcontroller GPIO and LIN transceiver inputs from battery line transients during load dump or jump-start events. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V rail and ground, clamping surges before they reach sensitive analog front-end circuitry. Use Value: Limits voltage to ≤14.4V during 41.7A surge, preventing latch-up or oxide breakdown in 16V-tolerant MCU I/O cells. |
Use Scenario: Shields 24V digital input optocoupler circuits from ESD and field-wiring induced surges in factory automation cabinets. IC Role / Device Role / Timing Role: Primary overvoltage clamp on dry-contact input stage, coordinated with series current-limiting resistor. Use Value: Absorbs 600W transient energy without degradation, maintaining <10µA leakage at 24V nominal to prevent false triggering. |
| DC Power Supply Input Stage | USB-C Port VBUS Protection |
Use Scenario: Guards AC/DC adapter output against back-EMF from connected motor loads and lightning-induced surges on long cables. IC Role / Device Role / Timing Role: First-line TVS on secondary-side 12V output, upstream of DC-DC converters and LDOs. Use Value: Clamps to 14.4V within nanoseconds, preserving downstream converter enable thresholds and feedback stability. |
Use Scenario: Provides secondary-level surge suppression on USB-C VBUS line after primary protection, targeting ±8kV contact ESD per IEC 61000-4-2. IC Role / Device Role / Timing Role: Fast-response unidirectional clamp referenced to system ground, sized for 41.7A peak current. Use Value: Delivers sub-1ns response and 14.4V clamping to protect USB PD controller and port power switches rated to 20V abs max. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5CA-13-F | Bi-directional version; symmetric clamping for AC-coupled or dual-polarity signal lines. | Required where both positive and negative transients occur (e.g., RS-485 bus, audio lines). | Select only if bidirectional protection is needed; otherwise, unidirectional SMBJ8.5A offers lower leakage and tighter VBR tolerance. |
| SMCJ8.5A-13-F | Same electrical specs but in larger SMC (DO-214AB) package; 1500W peak power rating. | Better thermal mass for higher-repetition surge duty cycles or elevated ambient temperatures (>75°C). | Choose when PCB layout allows larger footprint and system requires >600W single-pulse handling or improved thermal derating. |
Compared with SMBJ8.5CA-13-F and SMCJ8.5A-13-F, SMBJ8.5A-13-F delivers optimal balance of compact SMB footprint, precise unidirectional clamping, and sufficient 600W surge capacity for cost-sensitive 12V DC applications - making it preferred for space-constrained automotive and industrial control boards.
Availability
SMBJ8.5A-13-F is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and USB-C VBUS protection requiring stable component supply and full traceability through production ramp.
Supply support for SMBJ8.5A-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, manufacturing, and sales operations across Asia, Europe, and the Americas.
The SMBJ series belongs to Diodes' transient voltage suppression portfolio, engineered specifically for high-reliability overvoltage protection in automotive, industrial, and computing power systems - emphasizing low clamping ratio, repeatable surge endurance, and AEC-Q200 readiness.
FAQ
What is the polarity configuration of SMBJ8.5A-13-F?
SMBJ8.5A-13-F is a unidirectional TVS diode, indicated by the absence of "C" in its part number. It conducts only when the cathode is biased positively relative to the anode, making it suitable for DC rail protection where polarity is fixed. The cathode band marks the cathode terminal on the SMB package body.
Does SMBJ8.5A-13-F meet AEC-Q200 requirements?
While not explicitly qualified to AEC-Q200 in the DS19002 datasheet, SMBJ8.5A-13-F shares construction, materials, and test conditions with Diodes' AEC-Q200-qualified SMBJ variants (e.g., SMBJ8.5AQ-13-F). Its –55°C to +150°C operating range, glass-passivated die, and J-STD-020 Level 1 moisture rating align with automotive stress requirements.
How does SMBJ8.5A-13-F compare to SMAJ8.5A in terms of surge capability?
SMBJ8.5A-13-F delivers 600W peak pulse power, whereas SMAJ8.5A is rated for 400W. The SMB package's larger thermal mass and lower thermal resistance allow higher energy absorption. Both use identical VBR and VC specs, but SMBJ supports 41.7A IPP vs. SMAJ's 27.8A - making SMBJ preferred for demanding load-dump scenarios.
Can SMBJ8.5A-13-F be used in parallel for higher current handling?
No - TVS diodes like SMBJ8.5A-13-F should not be paralleled due to VBR mismatch causing current imbalance and premature failure. For higher IPP, select a single higher-rated device (e.g., SMCJ8.5A-13-F) or implement staged protection with series impedance and secondary clamping.
SMBJ8.5A-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):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 41.7A
- 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
SMBJ8.5A-13-F FAQ
1.How can I place an order for SMBJ8.5A-13-F through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5A-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 SMBJ8.5A-13-F reliable?
The price and inventory of SMBJ8.5A-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 SMBJ8.5A-13-F is usually 5 days.
3.What payment methods are accepted for SMBJ8.5A-13-F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5A-13-F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5A-13-F?
SMBJ8.5A-13-F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5A-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 SMBJ8.5A-13-F?
For technical support, including SMBJ8.5A-13-F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5A-13-F requirements.
6.How does Aetrix verify that SMBJ8.5A-13-F is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5A-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 SMBJ8.5A-13-F meets industry standards.
7.What is the process for return or replacement of SMBJ8.5A-13-F?
All SMBJ8.5A-13-F units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5A-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 SMBJ8.5A-13-F part is unused and in its original packaging.
Return procedure for SMBJ8.5A-13-F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5A-13-F Tags
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