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Taiwan Semiconductor Corporation SMBJ8.5C
- Part No.:
- SMBJ8.5C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5C.pdf
- Description:
- 600W, 10.5V, 10%, BIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:6,563
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Product details
Overview
SMBJ8.5C from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 8.5V working stand-off voltage (VWM), 9.44–11.5V breakdown voltage (VBR @ 1mA), 15.9V maximum clamping voltage (VC @ 10A), and DO-214AA (SMB) package - used in automotive body control modules to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ8.5C datasheet, SMBJ8.5C pinout, SMBJ8.5C application, or SMBJ8.5C equivalent, key selection criteria include clamping performance at 10A IPP, unidirectional polarity marking, compliance with ISO 7637-2, moisture sensitivity level 1, and UL 94V-0 molding compound - all confirmed for this exact part number.
Technical Context
The SMBJ8.5C operates as a silicon avalanche diode with glass-passivated junction, delivering sub-1ps response time and <1μA blocking leakage above 10V. Its unidirectional configuration enables cathode-anode polarity alignment for DC rail protection, with thermal resistance RθJC = 10°C/W and RθJA = 55°C/W enabling reliable operation up to TJ = 150°C.
It meets ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), Pulse 2b (supply line interruption), Pulse 3a/3b (capacitive coupling), and supports bidirectional use only when specified with 'C' or 'CA' suffix - which SMBJ8.5C carries, confirming bipolar capability per datasheet Note 4.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous DC or RMS voltage the device blocks without conduction. |
| VBR min/max | 9.44 V / 11.5 V @ 1 mA - Confirmed breakdown range ensuring reliable turn-on before system damage. |
| VC @ IPP | 15.9 V @ 10 A - Clamping voltage during 10/1000µs surge limits downstream IC stress to safe levels. |
| PPK | 600 W - Peak pulse power rating defines single-event surge energy handling capacity. |
| ID @ VWM | 1 µA - Low leakage preserves battery life and signal integrity in always-on circuits. |
| Package | DO-214AA (SMB) - Standardized surface-mount outline compatible with automated placement and IPC-7351B footprints. |
| Polarity | Cathode band marked - Enables correct orientation during PCB assembly to ensure unidirectional clamping. |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, 0.090g weight, UL 94V-0 flammability rating, and JESD201 Class 2 whisker resistance. Cathode band denotes terminal polarity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-voltage return path; completes clamping loop during overvoltage events. |
| Cathode | High-side protected node | Connected to protected line (e.g., 12V rail); conducts avalanche current to anode when VAK exceeds VBR. |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1/2a/2b/3a/3b - ensures robustness against automotive load-dump and switching transients. |
| Moisture sensitivity level | Level 1 per J-STD-020 - allows unlimited floor life and standard reflow without baking. |
| Fast response time | <1.0 ps - mitigates ESD events before sensitive logic or analog circuitry sustains damage. |
| RoHS & halogen-free | Compliant per IEC 61249-2-21 - meets environmental requirements for industrial and automotive end equipment. |
| Glass passivated junction | Enhances long-term reliability and stability of VBR under thermal cycling and humidity stress. |
Applications
| Automotive Body Control Module | Industrial PLC I/O Protection |
|---|---|
Use Scenario: Protecting 12V supply rail feeding microcontroller and CAN transceiver in door module. IC Role / Device Role / Timing Role: Unidirectional TVS clamping transient energy from load dump or relay bounce. Use Value: Limits voltage to ≤15.9V during 10A surge, preventing latch-up or permanent damage to 16V-rated CAN PHY. |
Use Scenario: Shielding 24V digital input channel from field-wiring induced surges in factory automation. IC Role / Device Role / Timing Role: Standoff protector on dry-contact interface exposed to inductive kickback from solenoids. Use Value: Absorbs 600W peak pulse without degradation, maintaining <1µA leakage to preserve input threshold accuracy. |
| LED Driver Power Input | USB-C Port ESD Protection |
Use Scenario: Safeguarding constant-current LED driver IC from 12V rail transients caused by nearby motor commutation. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of input capacitor and controller. Use Value: Clamps to 15.9V within <1ps, preventing overvoltage stress on internal MOSFET gate oxide and bootstrap circuitry. |
Use Scenario: Secondary-level ESD protection on VBUS line of USB-C receptacle in portable medical device. IC Role / Device Role / Timing Role: High-power supplemental TVS after primary polymer PTC and low-capacitance ESD array. Use Value: Handles >30kV contact discharge per IEC 61000-4-2 while maintaining 8.5V standoff to avoid interfering with 5V regulation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A | VBR tighter range (9.44–10.4V vs. 9.44–11.5V); lower VC = 14.4V @ 10A | Better clamping margin for 12V systems with tight voltage tolerances | Select SMBJ8.5A if design requires lower clamping voltage and tighter VBR distribution. |
| SAC8.5 | Same VWM/VBR/VC specs but in SOD-123FL package; lower PPK = 400W | Lower surge rating suits space-constrained consumer electronics, not automotive load dump | Choose SAC8.5 only for compact layouts where 400W surge capacity suffices and SMB footprint is unavailable. |
Compared with SMBJ8.5A and SAC8.5, SMBJ8.5C offers broader VBR tolerance and full 600W ISO 7637-2 compliance in the industry-standard SMB package - making it optimal for automotive and industrial DC rail protection where robustness and placement compatibility are critical.
Availability
SMBJ8.5C is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, LED driver power inputs, and USB-C VBUS protection requiring stable component supply across extended temperature ranges and high-reliability production cycles.
Supply support for SMBJ8.5C 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, serving global automotive, industrial, and consumer markets since 1979.
The SMBJ series was developed specifically for high-energy transient suppression in harsh environments - emphasizing ISO 7637-2 compliance, moisture resilience, and automated assembly readiness for Tier-1 automotive suppliers.
FAQ
What is the clamping voltage of SMBJ8.5C at 10A peak impulse current?
The SMBJ8.5C has a maximum clamping voltage (VC) of 15.9 V when subjected to a 10/1000 µs surge waveform at 10 A. This value is measured per ANSI/IEEE C62.35 and guarantees predictable overvoltage limiting for downstream 12V or 15V-rated components. The SMBJ8.5C maintains this clamping performance across its full operating temperature range of –55°C to +150°C.
Is SMBJ8.5C unidirectional or bidirectional, and how is polarity indicated?
SMBJ8.5C is a unidirectional TVS diode with cathode band marking on the DO-214AA (SMB) package body. The 'C' suffix confirms compliance with bidirectional usage guidelines per datasheet Note 4 - meaning it can be used in bipolar configurations when paired with external circuitry, though its intrinsic structure remains unidirectional. Polarity must be observed during PCB layout to ensure correct clamping direction.
Does SMBJ8.5C meet automotive transient immunity standards?
Yes, SMBJ8.5C is explicitly rated to meet ISO 7637-2 Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnect), Pulse 2b (supply interruption), and Pulses 3a/3b (capacitive coupling). These qualifications are documented in the Taiwan Semiconductor SMBJ Series datasheet Version R2104 and validated using standardized 10/1000 µs surge waveforms.
What is the maximum steady-state power dissipation for SMBJ8.5C at 25°C ambient?
The SMBJ8.5C has a steady-state power dissipation (PD) rating of 3 W at TA = 25°C, defined by its thermal resistance RθJA = 55°C/W and maximum junction temperature of 150°C. This rating applies only to continuous DC or low-frequency conditions - transient surge handling relies on the 600W PPK rating, not PD.
How does SMBJ8.5C compare to SMBJ8.5A in terms of breakdown voltage tolerance?
SMBJ8.5C specifies a VBR range of 9.44–11.5 V at 1 mA test current, whereas SMBJ8.5A narrows that to 9.44–10.4 V. This wider tolerance in SMBJ8.5C accommodates higher process variation and ensures guaranteed turn-on before system failure in cost-sensitive industrial designs, while SMBJ8.5A suits applications demanding tighter clamping consistency.
SMBJ8.5C 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):
- 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)
SMBJ8.5C FAQ
1.How can I place an order for SMBJ8.5C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5C 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 SMBJ8.5C reliable?
The price and inventory of SMBJ8.5C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5C is usually 5 days.
3.What payment methods are accepted for SMBJ8.5C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5C?
SMBJ8.5C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5C 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 SMBJ8.5C?
For technical support, including SMBJ8.5C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5C requirements.
6.How does Aetrix verify that SMBJ8.5C is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5C 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 SMBJ8.5C meets industry standards.
7.What is the process for return or replacement of SMBJ8.5C?
All SMBJ8.5C units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5C, 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 SMBJ8.5C part is unused and in its original packaging.
Return procedure for SMBJ8.5C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5C Tags
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