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Taiwan Semiconductor Corporation SMBJ8.5CA
- Part No.:
- SMBJ8.5CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CA.pdf
- Description:
- TVS DIODE 8.5VWM 14.4VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,765
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Product details
Overview
SMBJ8.5CA from Taiwan Semiconductor is a bidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in DC power rails and signal lines. It features a 8.5 V working stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR), 14.4 V maximum clamping voltage (VC) at 43 A peak pulse current, and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ8.5CA datasheet, SMBJ8.5CA pinout, SMBJ8.5CA application, or SMBJ8.5CA equivalent, key selection criteria include bidirectional clamping capability, low leakage (<1 µA at 8.5 V), ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, and suitability for automotive body electronics, industrial I/O protection, and USB/RS-485 interface hardening.
Technical Context
The SMBJ8.5CA implements a silicon avalanche diode structure with glass-passivated junction, enabling fast transient suppression without degradation under repeated surges. Its bidirectional configuration allows symmetrical clamping across both polarities, eliminating need for polarity-aware layout.
Thermal design is supported by 10 °C/W junction-to-case and 55 °C/W junction-to-ambient thermal resistance, with maximum junction temperature rated at +150 °C. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements for reflow compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins; sets minimum system rail margin. |
| VBR (min/max) | 9.44 V / 10.4 V @ 1 mA - Confirmed avalanche onset range; ensures reliable triggering above normal operating transients. |
| VC @ IPP | 14.4 V @ 43 A - Clamped voltage during 10/1000 µs surge; defines worst-case overvoltage seen by protected IC. |
| PPK | 600 W - Peak pulse power handling per 10/1000 µs waveform; supports automotive load-dump and ISO 7637-2 Pulse 5a. |
| ID @ VWM | <1 µA - Ultra-low leakage at stand-off voltage; avoids unnecessary power drain in battery-powered systems. |
| TJ max | +150 °C - Enables operation in under-hood automotive or industrial enclosures without derating. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; bidirectional symmetry means no anode/cathode orientation requirement - terminals are functionally identical and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode/Cathode (symmetrical) | Bidirectional avalanche junction terminal | Either end serves as clamping node; no polarity dependency simplifies PCB routing and eliminates assembly errors. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR and low leakage over 10+ year field life; prevents humidity-induced parameter drift. |
| Sub-1 ps response time | Clamps ESD events (IEC 61000-4-2 ±8 kV contact) before sensitive logic can be damaged. |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive subsystems including body control modules, lighting drivers, and sensor interfaces. |
| Halogen-free & RoHS-compliant | Meets IEC 61249-2-21 and EU Directive 2011/65/EU; supports green manufacturing and end-of-life recycling. |
Applications
| Automotive Body Electronics | Industrial Digital I/O Protection |
|---|---|
Use Scenario: Protecting LIN bus transceivers and door module microcontrollers from battery line transients and load dump. IC Role / Device Role: Bidirectional clamping element placed between VBAT and GND near connector entry point. Use Value: Limits induced surges to ≤14.4 V, preventing latch-up or gate oxide damage in 5 V/3.3 V logic. |
Use Scenario: Shielding PLC digital input channels from inductive kickback when switching solenoids or relays. IC Role / Device Role: Primary surge shunt on 24 V DC input line upstream of optocoupler or level translator. Use Value: Absorbs 600 W pulses without failure, maintaining signal integrity and reducing false-trigger rate. |
| USB 2.0 Data Line Protection | RS-485 Transceiver Interface |
Use Scenario: Safeguarding USB D+/D− pins against ESD events during hot-plug insertion in embedded host devices. IC Role / Device Role: Low-capacitance TVS pair (one per line) placed directly at USB connector. Use Value: Sub-1 ps response clamps ±15 kV HBM ESD before transceiver input stages saturate or fail. |
Use Scenario: Hardening RS-485 transceivers in factory automation networks exposed to ground loop surges and lightning-induced coupling. IC Role / Device Role: Common-mode clamp between A/B differential pair and local chassis ground. Use Value: Symmetrical 14.4 V clamping preserves differential swing margin while limiting common-mode overvoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.5CA | Same DO-214AC (SMA) package; 15.0 V VC @ 43 A; 500 W PPK; slightly higher clamping voltage. | Lower power rating reduces margin for sustained surges; suitable only where peak energy is strictly limited. | Prefer SMBJ8.5CA when 600 W rating or tighter clamping (14.4 V vs. 15.0 V) is required. |
| ON Semiconductor SMCJ8.5CA | DO-214AB (SMC) package; 14.4 V VC @ 43 A; 1500 W PPK; larger footprint and higher thermal mass. | Over-specified power handling increases cost and board area; justified only in high-reliability industrial systems. | Choose SMBJ8.5CA for space-constrained designs needing exact 600 W rating and SMB footprint compatibility. |
Compared with SMAJ8.5CA and SMCJ8.5CA, the SMBJ8.5CA delivers optimal balance of clamping performance (14.4 V), compact DO-214AA packaging, and 600 W surge capacity-making it ideal for automotive and industrial PCBs where layout density and precise energy absorption are critical.
Availability
SMBJ8.5CA is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC I/O protection, and USB/RS-485 interface hardening requiring stable component supply and full traceability.
Supply support for SMBJ8.5CA 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 MOSFETs for industrial and automotive markets.
The SMBJ series was developed specifically for high-reliability transient suppression in harsh environments, emphasizing robustness against ISO 7637-2 pulses, extended temperature operation, and lead-free reflow compatibility.
FAQ
What is the clamping voltage of SMBJ8.5CA and how is it measured?
The SMBJ8.5CA has a maximum clamping voltage (VC) of 14.4 V at 43 A peak pulse current, tested with a standardized 10/1000 µs waveform per ANSI/IEEE C62.35. This value represents the upper limit of voltage imposed on protected circuitry during a surge event and is confirmed in TSC's R2104 datasheet Table "ELECTRICAL SPECIFICATIONS" for part SMBJ8.5A (bidirectional variant). The SMBJ8.5CA achieves this performance consistently across its operating temperature range.
Is SMBJ8.5CA unidirectional or bidirectional, and how does that affect PCB layout?
The SMBJ8.5CA is a bidirectional TVS diode, indicated by the "CA" suffix per TSC's ordering convention. Its symmetrical avalanche structure means both terminals function identically-no anode/cathode orientation is required. This eliminates polarity-sensitive placement, reduces assembly errors, and simplifies routing in differential or AC-coupled signal paths where polarity reversal may occur.
Does SMBJ8.5CA meet automotive transient immunity standards?
Yes, the SMBJ8.5CA meets ISO 7637-2 Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (ground bounce) requirements as explicitly stated in the "FEATURES" section of the TSC SMBJ Series datasheet (Version R2104). Its 600 W rating and low clamping voltage make it suitable for body electronics and infotainment subsystems.
What is the maximum leakage current of SMBJ8.5CA at its working voltage?
The SMBJ8.5CA exhibits a maximum blocking leakage current (ID) of 1 µA at its 8.5 V working stand-off voltage (VWM), as specified in the "ELECTRICAL SPECIFICATIONS" table for SMBJ8.5A under "Maximum blocking leakage current ID@VWM". This ultra-low leakage ensures minimal standby power loss in battery-backed or energy-sensitive applications such as automotive sensors and portable industrial tools.
Can SMBJ8.5CA be used in place of SMBJ8.5A in a new design?
No-SMBJ8.5CA and SMBJ8.5A are functionally distinct: SMBJ8.5A is unidirectional (anode/cathode marked), while SMBJ8.5CA is bidirectional (no polarity marking). Substituting one for the other without verifying circuit topology may result in failed clamping during negative transients. Always match the suffix: "A" for unidirectional, "CA" for bidirectional, as defined in TSC's "Devices for Bipolar Applications" section.
SMBJ8.5CA 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:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SMBJ8.5CA FAQ
1.How can I place an order for SMBJ8.5CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CA 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 SMBJ8.5CA reliable?
The price and inventory of SMBJ8.5CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CA is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CA?
SMBJ8.5CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CA 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 SMBJ8.5CA?
For technical support, including SMBJ8.5CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CA requirements.
6.How does Aetrix verify that SMBJ8.5CA is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CA 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 SMBJ8.5CA meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CA?
All SMBJ8.5CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CA, 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 SMBJ8.5CA part is unused and in its original packaging.
Return procedure for SMBJ8.5CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CA Tags
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