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Taiwan Semiconductor Corporation SMBJ8.5
- Part No.:
- SMBJ8.5
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5.pdf
- Description:
- 600W, 10.5V, 10%, UNIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,304
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Product details
Overview
SMBJ8.5 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 DC power lines and signal paths. It features a 8.5 V working stand-off voltage (VWM), 9.44–11.5 V breakdown voltage (VBR) at 1 mA, 15.9 V maximum clamping voltage (VC) at 39 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ8.5 datasheet, SMBJ8.5 pinout, SMBJ8.5 application, or SMBJ8.5 equivalent, key selection criteria include clamping performance under IEC 61000-4-5 surge conditions, leakage current (<10 µA at 8.5 V), compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b, and compatibility with automated SMT assembly on industrial and automotive PCBs.
Technical Context
The SMBJ8.5 operates as a unidirectional avalanche diode, leveraging glass-passivated junction technology to achieve fast transient response and stable breakdown characteristics. Its clamping behavior is defined by a 10/1000 µs waveform, with thermal derating above 25°C per Fig.2 and junction-to-ambient thermal resistance of 55 °C/W.
It supports single-die configuration in DO-214AA package with cathode band polarity marking, matte tin-plated leads compliant with J-STD-002, and meets JESD201 Class 2 whisker resistance. Moisture sensitivity level is J-STD-020 Level 1, enabling unlimited floor life before reflow.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 11.5 V at 1 mA - Ensures reliable turn-on within specified tolerance band |
| VC @ IPP | 15.9 V at 39 A - Limits downstream voltage stress during 10/1000 µs surge events |
| PPK | 600 W - Peak pulse power handling capability per single non-repetitive surge |
| ID @ VWM | ≤10 µA - Low leakage preserves system efficiency in standby and low-power modes |
| TJ max | +150 °C - Enables operation in under-hood automotive and industrial ambient environments |
| RθJA | 55 °C/W - Determines required PCB copper area and thermal relief for sustained power dissipation |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; dual-leaded, gull-wing leadform; 0.090 g typical weight; UL 94V-0 molding compound; RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path | Connected to protected circuit ground or low-side return in unidirectional configuration |
| Cathode | Clamping node | Connected to line being protected (e.g., +12 V rail); conducts avalanche current during overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and long-term reliability under repeated surge stress |
| Fast response time <1.0 ps | Protects sensitive ICs before ESD or lightning-induced transients propagate through traces |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive load-dump and inductive-switching immunity requirements |
| J-STD-020 Level 1 moisture sensitivity | Eliminates bake-out requirement prior to reflow, reducing manufacturing cost and cycle time |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: 12 V battery-fed ECUs exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and ground to clamp surges before reaching PMIC or MCU. Use Value: Limits voltage to ≤15.9 V during 10/1000 µs transients, preventing latch-up or gate oxide damage in downstream silicon. | Use Scenario: 4–20 mA current-loop sensors in factory automation systems subject to cable ESD and inductive kickback. IC Role / Device Role / Timing Role: TVS mounted at connector entry point to shunt transients before analog front-end amplifier or ADC input. Use Value: Sub-10 µA leakage at 8.5 V avoids offset error in precision current measurement circuits. |
| LED Driver Overvoltage Clamping | USB Port ESD Suppression |
Use Scenario: Constant-current LED drivers in outdoor lighting subjected to lightning-induced surges on AC input or DC bus. IC Role / Device Role / Timing Role: TVS across output terminals to protect driver MOSFETs and current-sense resistors from reverse-polarity or surge events. Use Value: 600 W peak power rating sustains multiple 10/1000 µs pulses without degradation, supporting IP66-rated fixture longevity. | Use Scenario: USB 2.0 data lines in embedded host controllers where ESD events exceed IEC 61000-4-2 ±8 kV contact discharge. IC Role / Device Role / Timing Role: Unidirectional TVS on VBUS line only (not D+/D−), providing primary overvoltage barrier upstream of USB switch or LDO. Use Value: 15.9 V clamping ensures VBUS stays below 16 V during surge, preserving USB enumeration and avoiding brownout resets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | Narrower VBR range (9.44–10.4 V vs. 9.44–11.5 V); lower VC = 14.4 V at 43 A | Better clamping margin for ultra-low-voltage rails (e.g., 9 V logic supplies) | Select SMBJ8.5A when tighter VBR tolerance and lower clamping voltage are prioritized over peak current capacity |
| SMBJ8V5A (ON Semiconductor) | Identical VWM (8.5 V), VBR (9.4–10.4 V), VC (14.4 V), but higher ID limit (25 µA vs. 10 µA) | Acceptable for less sensitive analog circuits where slightly higher leakage is tolerable | Choose ON Semi SMBJ8V5A if supply chain diversification is required and 25 µA leakage aligns with system budget |
Compared with SMBJ8.5, the SMBJ8.5A offers improved clamping consistency at the expense of reduced surge current headroom, while the ON Semiconductor SMBJ8V5A provides second-source availability with relaxed leakage specs-both require validation of thermal layout due to identical RθJA = 55 °C/W.
Availability
SMBJ8.5 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and LED driver overvoltage clamping requiring stable component supply across multi-year production cycles.
Supply support for SMBJ8.5 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 Taiwanese semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for industrial and automotive markets.
The SMBJ series was developed specifically for high-reliability, surface-mount surge protection in harsh environments-emphasizing robust clamping, low leakage, and AEC-Q200 readiness for automotive subsystems.
FAQ
What is the maximum clamping voltage of SMBJ8.5 under standard 10/1000 µs surge conditions?
The SMBJ8.5 has a maximum clamping voltage (VC) of 15.9 V at 39 A peak impulse current under 10/1000 µs waveform conditions. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during transient events. The SMBJ8.5 maintains this clamping performance across its full operating temperature range of −55 °C to +150 °C.
Is SMBJ8.5 suitable for bidirectional transient protection?
No, SMBJ8.5 is a unidirectional TVS diode and is not rated for bidirectional operation. For bipolar applications, Taiwan Semiconductor specifies the SMBJ8.5C or SMBJ8.5CA variants, which include symmetrical breakdown in both directions. Using SMBJ8.5 in reverse-biased configurations may result in premature failure or undefined clamping behavior outside datasheet limits.
What is the marking code printed on the SMBJ8.5 device body?
The SMBJ8.5 is marked with the code "KS" on its package surface, as confirmed in Taiwan Semiconductor's official SMBJ series datasheet (Version R2104, Page 2). This marking appears adjacent to the cathode band and is used for visual identification and traceability during assembly and inspection. No additional suffixes (e.g., "A", "C") are present on standard SMBJ8.5 units.
Does SMBJ8.5 meet automotive qualification standards such as AEC-Q200?
Taiwan Semiconductor does not explicitly list AEC-Q200 qualification for SMBJ8.5 in the provided documentation. However, the device meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electrical disturbances and is constructed with JESD201 Class 2 whisker-resistant leads and J-STD-020 Level 1 moisture sensitivity-key prerequisites for automotive use. Final AEC-Q200 compliance requires manufacturer-specific test reports not included in public datasheet R2104.
What is the recommended PCB pad layout for SMBJ8.5 in DO-214AA package?
Taiwan Semiconductor recommends using the DO-214AA (SMB) suggested pad layout shown in datasheet Page 7, featuring 2.5 mm × 1.5 mm solder pads with 1.8 mm center-to-center spacing and thermal relief traces. Adequate copper area (≥25 mm² per terminal) is advised to support thermal dissipation, especially when operating near TJ max = +150 °C. The cathode band must be aligned with the designated silkscreen polarity indicator.
SMBJ8.5 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:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8.5V
- Voltage - Breakdown (Min):
- 9.44V
- Voltage - Clamping (Max) @ Ipp:
- 15.9V
- Current - Peak Pulse (10/1000µs):
- 39A
- 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)
SMBJ8.5 FAQ
1.How can I place an order for SMBJ8.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5 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 SMBJ8.5 reliable?
The price and inventory of SMBJ8.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5 is usually 5 days.
3.What payment methods are accepted for SMBJ8.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5?
SMBJ8.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5 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 SMBJ8.5?
For technical support, including SMBJ8.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5 requirements.
6.How does Aetrix verify that SMBJ8.5 is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5 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 SMBJ8.5 meets industry standards.
7.What is the process for return or replacement of SMBJ8.5?
All SMBJ8.5 units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5, 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 SMBJ8.5 part is unused and in its original packaging.
Return procedure for SMBJ8.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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