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Taiwan Semiconductor Corporation SMBJ85C
- Part No.:
- SMBJ85C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85C.pdf
- Description:
- 600W, 104.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,456
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Product details
Overview
SMBJ85C from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy surge protection in automotive and industrial power rails. It features a 85 V working stand-off voltage (VWM), 94.4–115 V breakdown voltage (VBR), 151 V maximum clamping voltage (VC) at 4.1 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ85C datasheet, SMBJ85C pinout, SMBJ85C application, or SMBJ85C equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, junction-to-ambient thermal resistance (55 °C/W), leakage current ≤1 µA at 85 V, and compatibility with automated SMT placement on 12 V–48 V DC systems.
Technical Context
The SMBJ85C operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (94.4–115 V @ 1 mA). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<1 µA at VWM), while the DO-214AA package supports high surge current handling (4.1 A @ 10/1000 µs waveform) without thermal runaway.
Thermal design is enabled by RθJA = 55 °C/W and RθJC = 10 °C/W, allowing reliable operation up to TJ = 150 °C. The device meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, making it suitable for under-hood automotive modules and industrial PLC I/O protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping begins; sets system DC rail compatibility (e.g., 48 V nominal with 20 % tolerance) |
| VBR min/max | 94.4 / 115 V @ 1 mA - Confirmed avalanche threshold range; ensures predictable turn-on margin above VWM |
| VC @ IPP | 151 V @ 4.1 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected ICs |
| PPK | 600 W - Peak pulse power handling per single transient; validated per IEC 61000-4-5 and ISO 7637-2 |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off; minimizes quiescent power loss in battery-backed systems |
| TJ max | +150 °C - Maximum junction temperature; enables use in engine control units and industrial enclosures without forced cooling |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.090 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-voltage return path; forms clamping loop with cathode |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., CAN_H, 24 V supply); conducts surge current to ground when VAK > VBR |
Key Features
| Feature | Design Value |
|---|---|
| Clamping speed | Typically <1.0 ps - Enables protection of high-speed interfaces (e.g., CAN FD, LIN) against EFT bursts without signal distortion |
| ISO 7637-2 compliance | Validated for Pulse 1, 2a, 2b, 3a, 3b - Meets automotive OEM requirements for load dump and inductive switching immunity |
| Moisture sensitivity | Level 1 per J-STD-020 - No dry-pack or bake-out required prior to reflow; supports standard SMT assembly |
| RoHS & halogen-free | Compliant with RoHS Directive 2011/65/EU and IEC 61249-2-21 - Supports green manufacturing and end-of-life recycling |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting 12 V/24 V power inputs in body control modules (BCM) and lighting ECUs from load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges exceeding 85 V. Use Value: Limits downstream voltage to ≤151 V during 600 W transients, preventing damage to LDOs, microcontrollers, and CAN transceivers. |
Use Scenario: Safeguarding analog sensor inputs (e.g., pressure, temperature) in factory automation I/O modules exposed to EFT and inductive kickback. IC Role / Device Role / Timing Role: Low-leakage (≤1 µA) TVS mounted at connector entry point to shunt fast transients before signal conditioning circuitry. Use Value: Maintains signal integrity by clamping <100 ns EFT events to <151 V while adding negligible offset or noise to mV-level sensor outputs. |
| DC Motor Drive Protection | LED Driver Supply Protection |
Use Scenario: Suppressing inductive switching spikes generated by brushed DC motor H-bridges in HVAC actuators and seat controls. IC Role / Device Role / Timing Role: TVS connected across motor terminals or power rail to absorb flyback energy during MOSFET turn-off. Use Value: Handles 4.1 A peak impulse current (10/1000 µs) without degradation, enabling robust operation over 100,000+ motor cycles. |
Use Scenario: Shielding constant-current LED drivers in commercial lighting from surges induced by nearby relay switching or lightning-induced coupling. IC Role / Device Role / Timing Role: Standoff-rated TVS placed upstream of driver IC to prevent latch-up or gate oxide failure during 600 W transients. Use Value: Clamps 10/1000 µs surges to 151 V while maintaining <1 µA leakage at 85 V, avoiding false dimming or shutdown in 24 V LED strings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ85A | Same VWM (85 V), slightly higher VC (152 V @ 4.1 A), identical DO-214AC (SMA) footprint but smaller thermal mass (RθJA = 65 °C/W vs. 55 °C/W) | Lower power derating above 75 °C ambient; less suitable for under-hood locations exceeding 105 °C | Select SMAJ85A only if board space is constrained and thermal margin ≥20 °C exists at max operating temperature |
| ON Semiconductor SMCJ85A | Same VWM (85 V), identical DO-214AB (SMC) package (larger than SMB), higher PPK (1500 W), lower VC (147 V @ 10.3 A) | Requires PCB pad redesign (SMC vs. SMB); better for high-reliability 48 V telecom systems needing >1 kW surge margin | Choose SMCJ85A only when upgrading to higher-power protection and layout revision is feasible |
Compared with SMBJ85C, SMAJ85A offers tighter board fit but reduced thermal headroom, while SMCJ85A delivers superior surge capacity at the cost of larger footprint and layout change-making SMBJ85C the optimal balance of 600 W rating, SMB size, and automotive-grade thermal performance.
Availability
SMBJ85C is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface hardening, and DC motor drive surge suppression requiring stable component supply across production lifecycles.
Supply support for SMBJ85C 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power MOSFETs since 1979.
The SMBJ series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing low clamping voltage, high reliability under thermal cycling, and compatibility with lead-free reflow profiles.
FAQ
What is the polarity configuration of SMBJ85C?
The SMBJ85C is a unidirectional TVS diode, with cathode marked by a band on the DO-214AA (SMB) package. It conducts only when reverse-biased beyond its breakdown voltage (94.4–115 V), making it suitable for DC power line protection where polarity is fixed. Unlike bipolar variants (e.g., SMBJ85CA), SMBJ85C does not protect against positive-going transients on grounded lines.
Does SMBJ85C meet automotive EMC standards?
Yes, SMBJ85C is explicitly validated to meet ISO 7637-2 test pulses 1, 2a, 2b, 3a, and 3b for electrical disturbances from conduction and coupling in road vehicles. Its 600 W peak pulse rating, 151 V clamping voltage, and sub-1 ps response ensure compliance in BCM, lighting, and body electronics modules without additional filtering.
What is the maximum allowable ambient temperature for SMBJ85C in continuous operation?
SMBJ85C supports continuous operation up to +125 °C ambient temperature when mounted on a standard FR-4 PCB with 1 in² copper pour, based on its RθJA = 55 °C/W and TJMAX = +150 °C. Derating curves in the datasheet confirm ≥80 % of 600 W pulse capability remains usable at 100 °C ambient.
How does SMBJ85C differ from SMBJ85A?
SMBJ85C has a minimum breakdown voltage of 94.4 V, while SMBJ85A starts at 94.4 V but caps at 104 V-giving SMBJ85C a wider VBR range (94.4–115 V) and higher clamping voltage (151 V vs. 137 V). This makes SMBJ85C more tolerant of voltage variation in noisy 24 V systems, whereas SMBJ85A offers tighter clamping for precision-sensitive circuits.
Is SMBJ85C compatible with lead-free reflow soldering processes?
Yes, SMBJ85C is qualified for lead-free reflow per JEDEC J-STD-020, with a moisture sensitivity level (MSL) of 1-meaning it can be stored indefinitely at ≤30 °C/60 % RH and processed using standard Pb-free profiles (peak temperature ≤260 °C, 60 s dwell). Matte tin plating ensures solderability per J-STD-002.
SMBJ85C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- 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:
- 151V
- Current - Peak Pulse (10/1000µs):
- 4.1A
- 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 (SMB)
SMBJ85C FAQ
1.How can I place an order for SMBJ85C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85C 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 SMBJ85C reliable?
The price and inventory of SMBJ85C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85C is usually 5 days.
3.What payment methods are accepted for SMBJ85C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85C?
SMBJ85C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85C 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 SMBJ85C?
For technical support, including SMBJ85C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85C requirements.
6.How does Aetrix verify that SMBJ85C is sourced from the original manufacturer or authorized distributors?
All SMBJ85C 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 SMBJ85C meets industry standards.
7.What is the process for return or replacement of SMBJ85C?
All SMBJ85C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85C, 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 SMBJ85C part is unused and in its original packaging.
Return procedure for SMBJ85C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ85C Tags
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