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Taiwan Semiconductor Corporation SMBJ8.5CH
- Part No.:
- SMBJ8.5CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5CH.pdf
- Description:
- 600W, 10.5V, BIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:4,431
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Product details
Overview
SMBJ8.5CH from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for automotive-grade ESD and surge protection. It features a 8.5V working stand-off voltage (VWM), 9.44–11.5V breakdown voltage (VBR @ 1mA), 15.9V maximum clamping voltage (VC) at 39A peak pulse current, and AEC-Q101 qualification for under-hood electronics.
For engineers reviewing the SMBJ8.5CH datasheet, SMBJ8.5CH pinout, SMBJ8.5CH application, or SMBJ8.5CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, leakage current ≤10µA at VWM, unidirectional polarity with cathode band marking, and compatibility with automated SMT placement on automotive PCBs.
Technical Context
The SMBJ8.5CH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified VBR range (9.44–11.5V at 1mA). Its glass-passivated junction ensures stable breakdown behavior and low leakage (<10µA at 8.5V), while fast response time (<1.0ps) enables effective suppression of EFT and lightning-induced transients.
Thermal performance is defined by RθJC = 10°C/W and RθJA = 55°C/W, supporting continuous operation up to TJ = 150°C. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements, confirming suitability for high-reliability automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum DC or continuous reverse operating voltage before conduction begins |
| VBR min / max | 9.44 V / 11.5 V @ 1 mA - Confirmed avalanche onset range ensuring reliable turn-on margin above VWM |
| VC @ IPP | 15.9 V @ 39 A - Clamped voltage during 10/1000µs surge, limiting downstream IC stress to safe levels |
| PPK | 600 W - Peak pulse power handling per single 10/1000µs transient, derated above 25°C ambient |
| ID @ VWM | ≤10 µA - Low leakage preserves signal integrity and minimizes standby power loss in protected circuits |
| Package | DO-214AA (SMB) - Standardized surface-mount outline enabling automated assembly and board-level reliability |
| AEC-Q101 | Qualified - Validated for automotive temperature cycling, humidity, and mechanical stress per AEC standard |
Pinout & Package
DO-214AA (SMB) package with molded plastic body, matte tin-plated leads, and cathode band marking for unidirectional polarity. Weight ≈ 0.090 g. Moisture sensitivity level (MSL) = 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to ground or low-side reference in unidirectional TVS configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., CAN_H, LIN, sensor supply); marked with band |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive under-hood use including temperature cycling, vibration, and humidity exposure |
| Glass passivated junction | Ensures stable VBR tolerance and long-term reliability under repeated surge stress |
| Clamping voltage ≤15.9 V | Protects 12V automotive systems (e.g., MCU I/O, CAN transceivers) from ISO 7637-2 transients without overvoltage damage |
| Leakage <10 µA at 8.5 V | Minimizes quiescent current draw in always-on vehicle modules such as body control units |
| Fast response <1.0 ps | Responds ahead of most semiconductor switching times, preventing ESD-induced latch-up or gate oxide rupture |
Applications
| Automotive CAN Bus Protection | LED Lighting Driver Input Protection |
|---|---|
Use Scenario: Protecting CAN_H/CAN_L lines in vehicle ECUs against load dump and inductive switching transients per ISO 7637-2 Pulse 2b/3b. IC Role / Device Role / Timing Role: Unidirectional TVS placed between CAN_H and ground to clamp negative-going spikes while preserving signal integrity. Use Value: Limits voltage excursion to ≤15.9 V during 39 A surges, preventing damage to CAN transceivers rated for ≤40 V absolute maximum. |
Use Scenario: Safeguarding constant-current LED drivers in automotive exterior lighting from battery line transients during ignition or alternator load dump. IC Role / Device Role / Timing Role: Placed across input terminals to absorb 600 W pulses without thermal runaway or parameter shift. Use Value: Maintains VWM = 8.5 V to avoid false triggering during normal 12 V system operation while clamping surges to safe levels. |
| Industrial Sensor Interface Protection | Power Supply Rail Clamp |
Use Scenario: Shielding analog sensor inputs (e.g., pressure, temperature) in engine control modules from EFT bursts and cable discharge events. IC Role / Device Role / Timing Role: Connected between sensor signal line and ground to shunt fast transients before reaching precision ADC front-end. Use Value: Sub-10 µA leakage avoids loading sensitive high-impedance sensor outputs; 15.9 V clamping protects 3.3 V/5 V ADC references. |
Use Scenario: Clamping 12 V supply rails feeding microcontrollers or communication ICs in telematics units subjected to ISO 16750-2 load dump. IC Role / Device Role / Timing Role: Parallel-connected TVS absorbing energy from 10/1000 µs surges exceeding regulator capability. Use Value: 600 W PPK rating handles 12 V system surges up to 39 A peak, extending upstream regulator lifetime and avoiding brownout resets. |
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 SMAJ8.5A | Same DO-214AC (SMA) package; slightly higher VC = 16.5 V @ 38.2 A; VBR = 9.4–10.4 V | Lower power rating (400 W vs. 600 W); less suitable for sustained ISO 7637-2 Pulse 1 | Select SMBJ8.5CH when higher surge energy absorption and AEC-Q101 validation are required. |
| Vishay SMA6J8.5A | DO-214AC (SMA) package; VC = 16.7 V @ 37.7 A; VBR = 9.4–10.4 V; no AEC-Q101 documentation confirmed | Designed for general industrial use; lacks automotive qualification evidence in public datasheets | Choose SMBJ8.5CH for automotive programs requiring documented AEC-Q101 compliance and tighter VBR tolerance. |
Compared with SMAJ8.5A and SMA6J8.5A, the SMBJ8.5CH delivers higher 600 W surge capacity in the same footprint class, verified AEC-Q101 qualification, and lower clamping voltage (15.9 V), making it preferable for automotive 12 V rail and CAN bus protection where reliability and margin are critical.
Availability
SMBJ8.5CH is available at Aetrix Electronics and suitable for automotive electronics, industrial sensor interfaces, and LED lighting systems requiring stable component supply with full traceability and lifecycle management.
Supply support for SMBJ8.5CH 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 manufacturer specializing in discrete semiconductors, including TVS diodes, rectifiers, and MOSFETs, with global distribution and automotive qualification capabilities.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in 12 V and 24 V automotive subsystems, emphasizing robust clamping, low leakage, and automated assembly compatibility.
FAQ
What does the 'CH' suffix indicate in SMBJ8.5CH?
The 'CH' suffix in SMBJ8.5CH denotes a unidirectional TVS diode with cathode-band polarity marking and AEC-Q101 qualification. It distinguishes this variant from bidirectional ('CAH') or non-automotive ('H') versions. The SMBJ8.5CH is explicitly rated for automotive environments and tested per AEC-Q101 stress conditions.
Is SMBJ8.5CH compatible with reflow soldering per J-STD-020?
Yes, SMBJ8.5CH has moisture sensitivity level (MSL) 1 per J-STD-020, meaning it can be stored indefinitely at ≤30°C/85% RH and requires no baking prior to standard lead-free reflow profiles. Its matte tin-plated leads meet J-STD-002 solderability requirements for automated SMT assembly.
How does SMBJ8.5CH perform under ISO 7637-2 Pulse 1 (inductive load dump)?
SMBJ8.5CH meets ISO 7637-2 Pulse 1/2a/2b/3a/3b requirements due to its 600 W peak pulse power rating and 15.9 V clamping voltage at 39 A. When used with appropriate series impedance, it limits induced voltage on protected lines to safe levels for 12 V automotive ICs, as validated in TSC's application testing.
What is the maximum junction temperature for continuous operation of SMBJ8.5CH?
The SMBJ8.5CH has a maximum junction temperature (TJ) of +150°C, with thermal resistance RθJC = 10°C/W and RθJA = 55°C/W. Under typical PCB layout with 1 in² copper pour, it sustains repetitive surges without exceeding TJ limit, provided ambient temperature remains ≤125°C.
Does SMBJ8.5CH have halogen-free and RoHS-compliant construction?
Yes, SMBJ8.5CH is RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and all materials are documented in TSC's declaration of conformity, supporting environmental compliance for automotive and industrial end products.
SMBJ8.5CH 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):
- 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:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
SMBJ8.5CH FAQ
1.How can I place an order for SMBJ8.5CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5CH 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 SMBJ8.5CH reliable?
The price and inventory of SMBJ8.5CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5CH is usually 5 days.
3.What payment methods are accepted for SMBJ8.5CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5CH?
SMBJ8.5CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5CH 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 SMBJ8.5CH?
For technical support, including SMBJ8.5CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5CH requirements.
6.How does Aetrix verify that SMBJ8.5CH is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5CH 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 SMBJ8.5CH meets industry standards.
7.What is the process for return or replacement of SMBJ8.5CH?
All SMBJ8.5CH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5CH, 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 SMBJ8.5CH part is unused and in its original packaging.
Return procedure for SMBJ8.5CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5CH Tags
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