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Taiwan Semiconductor Corporation SMBJ85CH
- Part No.:
- SMBJ85CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85CH.pdf
- Description:
- 600W, 104.7V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,100
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Product details
Overview
SMBJ85CH from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) 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 impulse current (IPP), and 600 W peak pulse power rating with sub-1 ps response time.
For engineers reviewing the SMBJ85CH datasheet, SMBJ85CH pinout, SMBJ85CH application, or SMBJ85CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification for automotive use, moisture sensitivity level 1 compliance, and unidirectional polarity marking for correct PCB orientation.
Technical Context
The SMBJ85CH operates as a silicon avalanche diode optimized for fast transient suppression on DC power lines. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1 µA at 85 V), while its thermal resistance (RθJA = 55 °C/W) supports sustained operation up to TJ = 150 °C.
It delivers 600 W non-repetitive peak pulse power with 10/1000 µs waveform, clamping transients to ≤151 V at 4.1 A. The device meets ISO 7637-2 immunity requirements for automotive electronics and complies with JESD201 Class 2 whisker resistance and RoHS/halogen-free standards.
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 @ 1 mA - Confirmed avalanche onset range ensuring reliable turn-on before system damage |
| VC @ IPP | 151 V @ 4.1 A - Clamped voltage during 10/1000 µs surge, defining worst-case stress on downstream ICs |
| PPK | 600 W - Peak pulse power handling capability per single 10/1000 µs transient event |
| IR @ VWM | <1 µA - Ultra-low leakage preserves battery life and avoids false triggering in high-impedance circuits |
| TJ max | +150 °C - Junction temperature limit enabling use in under-hood automotive environments |
| Package | DO-214AA (SMB) - Surface-mount outline with 0.090 g mass, UL 94V-0 molding, and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal unidirectional configuration. Cathode terminal is marked by a band and must be oriented toward the protected circuit's ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line | Connected to power rail or signal line requiring surge protection; reverse-biased during normal operation |
| Cathode | Ground reference side | Connected to system ground; conducts avalanche current to shunt transients when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per JEDEC standards |
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives |
| Sub-1 ps response time | Enables protection against nanosecond-scale EFT bursts without allowing voltage overshoot to reach sensitive ICs |
| ISO 7637-2 compliance | Rated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (EFT) waveforms |
| Moisture sensitivity level 1 | Eliminates need for dry-pack or baking prior to reflow, supporting standard SMT assembly processes |
Applications
| Automotive Power Rail Protection | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12 V/24 V battery-fed ECUs exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power input and ground to clamp surges before they reach PMICs or microcontrollers. Use Value: Limits transient voltage to ≤151 V, preventing latch-up or gate oxide damage in downstream 3.3 V/5 V logic. |
Use Scenario: Digital input modules receiving 24 V DC signals from field sensors in factory automation. IC Role / Device Role / Timing Role: Front-end protection element on each channel, absorbing EFT and inductive kickback from solenoids or relays. Use Value: Withstands ≥1000 pulses per ISO 7637-2 Pulse 3b, maintaining signal integrity without degradation over 10+ year service life. |
| LED Driver Overvoltage Clamp | Automotive Lighting ESD Protection |
Use Scenario: Constant-current LED drivers in headlamps subjected to 12 V supply spikes during ignition. IC Role / Device Role / Timing Role: Parallel-connected TVS across driver input capacitor to absorb short-duration overvoltage events. Use Value: Clamps 600 W surges within 1 ps, avoiding thermal runaway in GaN-based drivers operating near 150 °C junction temperature. |
Use Scenario: CAN/LIN bus nodes in exterior lighting modules exposed to human-body-model (HBM) ESD events. IC Role / Device Role / Timing Role: Secondary-level protection after common-mode chokes, shunting ESD energy directly to chassis ground. Use Value: Sub-1 µA leakage at 85 V prevents false wake-up in always-on lighting control ICs during sleep mode. |
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 SMAJ85A | Same DO-214AC (SMA) package; slightly higher VC (152 V) and lower IPP (4.0 A); not AEC-Q101 qualified | Approved for commercial/industrial use only; unsuitable for automotive OEM designs requiring AEC validation | Select SMBJ85CH when AEC-Q101 compliance and DO-214AA mechanical robustness are mandatory |
| Vishay SMA6J85A | DO-214AC (SMA) package; identical VWM/VBR/VC specs; RθJA = 60 °C/W vs. 55 °C/W for SMBJ85CH | Higher thermal resistance limits power derating above 75 °C ambient; no ISO 7637-2 documentation provided | Prefer SMBJ85CH for under-hood applications where thermal margin and automotive standard compliance are critical |
Compared with SMAJ85A and SMA6J85A, the SMBJ85CH offers AEC-Q101 qualification, lower thermal resistance, and documented ISO 7637-2 immunity-making it the only option validated for automotive power rail protection in production ECUs.
Availability
SMBJ85CH is available at Aetrix Electronics and suitable for automotive ECU design, industrial PLC I/O modules, LED driver overvoltage clamping, and exterior lighting ESD protection requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMBJ85CH 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 SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments, emphasizing robust clamping, low leakage, and process-controlled VBR consistency across voltage grades.
FAQ
What is the polarity configuration of SMBJ85CH?
The SMBJ85CH is a unidirectional TVS diode with cathode band marking. It conducts only when anode-to-cathode voltage exceeds the breakdown threshold (94.4–115 V), making it suitable for DC power line protection where polarity is fixed. Bidirectional variants use "CAH" suffix (e.g., SMBJ85CAH), but SMBJ85CH is strictly unidirectional.
Does SMBJ85CH meet automotive qualification standards?
Yes, SMBJ85CH is AEC-Q101 qualified and tested per ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b waveforms. It also satisfies JESD201 Class 2 whisker resistance, MSL Level 1 moisture sensitivity, and RoHS/halogen-free requirements-fully aligned with Tier 1 automotive supply chain specifications.
What is the maximum clamping voltage for SMBJ85CH under surge conditions?
The SMBJ85CH clamps to a maximum of 151 V when subjected to a 10/1000 µs surge current of 4.1 A (IPP). This value is guaranteed across temperature and lot variations per Taiwan Semiconductor's datasheet revision A2102 and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMBJ85CH be used in bidirectional signal line protection?
No-SMBJ85CH is unidirectional and must not be used on AC or bidirectional signal lines. For such applications, select the bipolar variant SMBJ85CAH, which provides symmetrical clamping in both directions and uses different test conditions (e.g., VBR measured in both polarities). Using SMBJ85CH on bidirectional lines risks permanent failure due to reverse conduction.
What is the thermal resistance profile of SMBJ85CH?
SMBJ85CH has a junction-to-ambient thermal resistance (RθJA) of 55 °C/W and junction-to-case resistance (RθJC) of 10 °C/W. These values enable reliable operation up to +150 °C junction temperature when mounted on standard 1 oz copper PCB pads per the recommended DO-214AA pad layout, with derating applied above 25 °C ambient.
SMBJ85CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AA, SMB
- Series:
- SMBJH
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ85CH FAQ
1.How can I place an order for SMBJ85CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85CH 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 SMBJ85CH reliable?
The price and inventory of SMBJ85CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85CH is usually 5 days.
3.What payment methods are accepted for SMBJ85CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85CH?
SMBJ85CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85CH 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 SMBJ85CH?
For technical support, including SMBJ85CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85CH requirements.
6.How does Aetrix verify that SMBJ85CH is sourced from the original manufacturer or authorized distributors?
All SMBJ85CH 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 SMBJ85CH meets industry standards.
7.What is the process for return or replacement of SMBJ85CH?
All SMBJ85CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85CH, 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 SMBJ85CH part is unused and in its original packaging.
Return procedure for SMBJ85CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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