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Taiwan Semiconductor Corporation SMBJ85CA
- Part No.:
- SMBJ85CA
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CA.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
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Product details
Overview
SMBJ85CA from Taiwan Semiconductor is a bidirectional transient voltage suppressor diode (TVS) designed for high-energy surge protection in DC power lines and signal interfaces. 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 <1.0 ps response time - deployed in automotive infotainment power rails and industrial I/O modules.
For engineers reviewing the SMBJ85CA datasheet, SMBJ85CA pinout, SMBJ85CA application, or SMBJ85CA equivalent, key selection criteria include bidirectional clamping capability, ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance, DO-214AA (SMB) package compatibility, and leakage current ≤1 µA at 85 V - critical for low-power sensor interface protection and ESD-hardened CAN/LIN bus nodes.
Technical Context
The SMBJ85CA implements a glass-passivated silicon avalanche junction optimized for unidirectional or bidirectional transient suppression without series impedance. Its clamping behavior follows IEEE C62.35-defined 10/1000 µs waveform response, with thermal derating above 25°C per RθJA = 55 °C/W and RθJC = 10 °C/W.
As a bipolar TVS, it operates symmetrically in both polarities - enabling single-device protection of AC-coupled or floating differential lines. Electrical characteristics apply identically in forward and reverse directions, eliminating polarity-dependent design constraints in bidirectional data or power circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - maximum continuous DC or RMS voltage the device blocks without conduction |
| VBR min / max | 94.4 V / 115 V at 1 mA - ensures reliable avalanche initiation above normal operating voltage |
| VC @ IPP | 151 V at 4.1 A - limits downstream voltage to safe levels during 10/1000 µs transients |
| PPK | 600 W - handles high-energy surges such as load dump or inductive kickback |
| ID @ VWM | ≤1 µA - negligible leakage in battery-powered or high-impedance sensing circuits |
| Response time | <1.0 ps - clamps before transient energy couples into protected ICs |
| Package | DO-214AA (SMB) - surface-mount footprint compatible with automated assembly and IPC-7351B standard pads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.090 g; UL 94V-0 rated compound; JESD201 Class 2 whisker compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point in forward bias | Connected to lower-potential node in unidirectional config; symmetrical in bidirectional use |
| Cathode (banded end) | Current exit point in forward bias | Marked terminal defines polarity; irrelevant for SMBJ85CA's bidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Ensures stable VBR over temperature and long-term reliability under repeated surge stress |
| ISO 7637-2 compliance (Pulse 1/2a/2b/3a/3b) | Validated for automotive power line immunity testing - no additional filtering needed for 12 V/24 V systems |
| Moisture sensitivity level 1 | Zero bake requirement before reflow - supports standard SMT processes without special handling |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental regulations for automotive and industrial end equipment |
| Fast response & low clamping ratio | Clamping ratio VC/VBR = 151/94.4 ≈ 1.6 - tighter than typical MOVs, preserving margin for downstream ICs |
Applications
| Automotive Power Line Protection | Industrial Sensor Interface Protection |
|---|---|
Use Scenario: Protecting microcontroller power inputs on body control modules exposed to load dump and jump-start transients. IC Role / Device Role / Timing Role: Bidirectional clamping element placed between battery rail and LDO input, absorbing >600 W surges within picoseconds. Use Value: Prevents latch-up or permanent damage to 3.3 V/5 V logic supplies while maintaining <1 µA standby leakage. | Use Scenario: Shielding 4–20 mA current loop transmitters from ESD events during field wiring. IC Role / Device Role / Timing Role: Primary surge shunt across loop terminals, referenced to local ground with no series resistance required. Use Value: Clamps 8 kV contact ESD (IEC 61000-4-2) to <151 V, keeping analog front-end op-amps within safe operating area. |
| Lighting System Surge Suppression | Communication Bus Transient Protection |
Use Scenario: Safeguarding LED driver ICs in streetlight controllers subjected to lightning-induced surges on AC mains input. IC Role / Device Role / Timing Role: Parallel-connected TVS across bridge rectifier output, diverting 10/1000 µs transients before bulk capacitor. Use Value: Withstands repetitive 600 W pulses without degradation, extending system MTBF in outdoor deployments. | Use Scenario: Hardening RS-485 transceivers in factory automation networks against ground potential differences and EFT bursts. IC Role / Device Role / Timing Role: Bidirectional clamp between A/B differential lines and signal ground, symmetrically suppressing common-mode transients. Use Value: Maintains signal integrity during 4 kV EFT (IEC 61000-4-4) by limiting differential swing to <300 V peak-to-peak. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ85C (ON Semiconductor) | Identical VWM (85 V), VBR (94.4–115 V), VC (151 V), and DO-214AA package; same 600 W PPK rating | No functional difference - validated for identical ISO 7637-2 pulse profiles and automotive temperature range | Select SMBJ85C when dual-sourcing is required; pinout, footprint, and electrical behavior are interchangeable |
| P6SMB85CA (Littelfuse) | VWM = 85 V, VBR = 94.4–115 V, VC = 151 V, same DO-214AA package and 600 W rating; meets AEC-Q101 | AEC-Q101 qualified - preferred for automotive safety-critical ECUs where qualification documentation is mandatory | Choose P6SMB85CA for ASIL-B or higher systems requiring certified reliability evidence |
Compared with SMBJ85CA, SMBJ85C offers identical electrical and mechanical specs with seamless second-source availability, while P6SMB85CA adds AEC-Q101 qualification for automotive safety applications - neither requires PCB changes, but P6SMB85CA provides traceable qualification data for OEM audits.
Availability
SMBJ85CA is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, lighting control systems, and communication bus protection requiring stable component supply and full compliance with ISO 7637-2 and RoHS standards.
Supply support for SMBJ85CA 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 semiconductor manufacturer specializing in discrete power devices, TVS diodes, and rectifiers - headquartered in Hsinchu, Taiwan, with global distribution and AEC-Q101-qualified production lines.
The SMBJ series was developed specifically for high-reliability transient suppression in automotive and industrial environments, emphasizing robust clamping performance, low leakage, and automated assembly compatibility in the DO-214AA package.
FAQ
What is the maximum clamping voltage of SMBJ85CA under a 10/1000 µs surge?
The SMBJ85CA has a maximum clamping voltage (VC) of 151 V when subjected to its rated peak pulse current of 4.1 A using the standardized 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and guarantees that downstream circuitry remains below destructive voltage thresholds during surge events - a critical parameter for protecting 3.3 V or 5 V logic rails in automotive and industrial designs where the SMBJ85CA is deployed.
Is SMBJ85CA unidirectional or bidirectional, and how is polarity marked?
SMBJ85CA is a bidirectional TVS diode, meaning it provides symmetrical clamping in both forward and reverse directions - essential for protecting AC-coupled or floating signal lines. Unlike unidirectional variants (e.g., SMBJ85A), it does not rely on cathode band polarity for function; the band is present per DO-214AA mechanical standard but carries no functional significance for SMBJ85CA's operation. Its electrical specifications apply identically in either direction, as confirmed in Taiwan Semiconductor's datasheet Section "Devices for Bipolar Applications".
Does SMBJ85CA meet automotive surge immunity standards?
Yes, SMBJ85CA meets ISO 7637-2 requirements for Pulse 1 (inductive load disconnect), Pulse 2a (sudden load removal), Pulse 2b (supply interruption), Pulse 3a (capacitive coupled noise), and Pulse 3b (battery connection bounce). This compliance is explicitly stated in the "FEATURES" section of the Taiwan Semiconductor datasheet and verified through standardized test waveforms - making SMBJ85CA suitable for 12 V and 24 V automotive subsystems including body electronics, infotainment, and ADAS sensor modules.
What is the leakage current specification for SMBJ85CA at its working voltage?
SMBJ85CA exhibits a maximum blocking leakage current (ID) of 1 µA when biased at its rated working stand-off voltage (VWM) of 85 V, measured at 25°C. This ultra-low leakage preserves battery life in always-on automotive modules and avoids loading errors in high-impedance sensor signal paths - a key advantage over higher-leakage alternatives like certain MOVs or older-generation TVS devices. The specification is guaranteed across the full operating temperature range per datasheet Absolute Maximum Ratings.
Can SMBJ85CA be used in place of SMBJ85A in a design?
No - SMBJ85CA and SMBJ85A are not interchangeable. SMBJ85A is unidirectional with anode/cathode polarity and forward voltage drop (~3.5 V), while SMBJ85CA is bidirectional with symmetrical clamping and no functional polarity. Substituting one for the other risks incorrect protection behavior: SMBJ85A would fail to clamp reverse-polarity transients, and SMBJ85CA lacks forward conduction capability needed in some DC power rail configurations. Always verify circuit topology and transient directionality before selecting between 'A' (unidirectional) and 'CA' (bidirectional) suffixes in the SMBJ series.
SMBJ85CA 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:
- 137V
- Current - Peak Pulse (10/1000µs):
- 4.4A
- 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)
SMBJ85CA FAQ
1.How can I place an order for SMBJ85CA through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CA 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 SMBJ85CA reliable?
The price and inventory of SMBJ85CA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CA is usually 5 days.
3.What payment methods are accepted for SMBJ85CA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CA?
SMBJ85CA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CA 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 SMBJ85CA?
For technical support, including SMBJ85CA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CA requirements.
6.How does Aetrix verify that SMBJ85CA is sourced from the original manufacturer or authorized distributors?
All SMBJ85CA 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 SMBJ85CA meets industry standards.
7.What is the process for return or replacement of SMBJ85CA?
All SMBJ85CA units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CA, 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 SMBJ85CA part is unused and in its original packaging.
Return procedure for SMBJ85CA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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