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Taiwan Semiconductor Corporation SMBJ8.5H
- Part No.:
- SMBJ8.5H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5H.pdf
- Description:
- 600W, 10.5V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:9,915
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Product details
Overview
SMBJ8.5H from Taiwan Semiconductor is a unidirectional 600W surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, with 8.5V working stand-off voltage (VWM), 9.44–11.5V breakdown voltage (VBR), and 15.9V maximum clamping voltage (VC) at 39A peak pulse current - designed for automotive ECU power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMBJ8.5H datasheet, SMBJ8.5H pinout, SMBJ8.5H application, or SMBJ8.5H equivalent, key selection criteria include clamping performance under 10/1000µs surge, leakage current ≤10µA at VWM, AEC-Q101 qualification, and compatibility with automated SMT assembly on 1.6mm PCB thickness.
Technical Context
The SMBJ8.5H employs a glass-passivated silicon junction optimized for fast response (<1.0ps) and low clamping ratio (VC/VBR ≈ 1.4–1.7). It operates as a unidirectional shunt protector, conducting only during reverse overvoltage events while maintaining <10µA blocking leakage at 8.5V DC.
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, enabling 3W steady-state dissipation at 25°C ambient. Its 150°C max junction temperature and J-STD-020 Level 1 moisture sensitivity support reflow-compatible manufacturing without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR @ IT=1mA | 9.44–11.5 V - Breakdown threshold range ensuring reliable turn-on above system nominal voltage |
| VC @ IPP=39A | 15.9 V - Clamped voltage during 10/1000µs surge, limiting downstream IC stress to safe margin |
| ID @ VWM | ≤10 µA - Low leakage preserves battery-powered circuit standby current budget |
| PPK | 600 W - Peak pulse power rating per 10/1000µs waveform, validated per ANSI/IEEE C62.35 |
| TJ max | +150 °C - Enables operation in under-hood automotive environments without derating |
| AEC-Q101 | Qualified - Certified for automotive electronics per stress test requirements including HTOL, TCT, and HAST |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; 2-terminal unidirectional configuration; matte tin-plated leads compliant with J-STD-002 solderability and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input reference node (cathode-banded side is cathode) | Connected to protected line (e.g., 12V rail); reverse-biased during normal operation |
| Cathode | Clamp return path | Connected to ground or low-impedance return; conducts surge current to GND when VLINE > VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability across temperature cycling, humidity, and high-temperature operating life |
| Glass passivated junction | Ensures stable VBR over time and immunity to surface contamination in harsh environments |
| Clamping ratio VC/VBR ≤ 1.7 | Minimizes overvoltage overshoot during fast transients, protecting 5V/3.3V logic interfaces downstream |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (ESD-like noise) immunity requirements |
| Moisture sensitivity Level 1 | Enables standard SMT reflow without pre-baking, reducing production cost and handling risk |
Applications
| Automotive Body Control Module (BCM) | LED Headlamp Driver Protection |
|---|---|
Use Scenario: Protects microcontroller I/O and CAN transceiver power rails from load-dump transients during alternator regulation failure. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12V supply and local LDO input to clamp surges before regulator stage. Use Value: Limits clamped voltage to 15.9V, keeping downstream 20V-rated LDOs within safe SOA and avoiding brownout resets. |
Use Scenario: Shields constant-current LED driver ICs from inductive kickback when headlamp relays switch off. IC Role / Device Role / Timing Role: Shunt protector across relay coil flyback path and driver VCC pin. Use Value: Absorbs 600W peak energy within 1ms, preventing driver latch-up or gate oxide damage during 100V+ spikes. |
| Industrial PLC Digital Input Module | Automotive Infotainment Power Supply |
Use Scenario: Guards optocoupler input circuits connected to 24V field wiring exposed to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: First-line protection before series resistor and opto-LED anode. Use Value: Sub-10µA leakage avoids false triggering of high-impedance inputs; 15.9V clamping ensures opto-LED stays below absolute max rating. |
Use Scenario: Secures USB-C PD controller and display power management ICs against battery line transients during jump-start events. IC Role / Device Role / Timing Role: Bidirectional protection not applicable - SMBJ8.5H used unidirectionally on 5V/12V rails feeding PMIC inputs. Use Value: 8.5V VWM matches nominal 12V rail with 20% tolerance, allowing clean operation during cold-crank (6.5V) while clamping at 15.9V during 24V jump-start spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.5A | Same DO-214AC (SMA) package; 8.5V VWM, 16.7V [email protected]; higher RθJA = 65°C/W | Lower power density due to smaller SMA footprint; less suitable for high-ambient under-hood use | Prefer SMBJ8.5H where thermal margin or AEC-Q101 validation is required |
| ON Semiconductor 1.5SMC8.5A | DO-214AB (SMC) package; 8.5V VWM, 16.5V [email protected]; 1500W PPK rating | Larger footprint increases PCB area; higher PPK unnecessary for ISO 7637-2 Pulse 1 (600W typical) | Choose SMBJ8.5H for space-constrained automotive modules requiring AEC-Q101 and SMB form factor |
Compared with SMAJ8.5A and 1.5SMC8.5A, the SMBJ8.5H delivers optimal balance of AEC-Q101 compliance, DO-214AA thermal performance (RθJA = 55°C/W), and precise 600W surge handling - making it the preferred choice for compact, thermally demanding automotive ECUs.
Availability
SMBJ8.5H is available at Aetrix Electronics and suitable for automotive body control modules, LED lighting drivers, industrial PLC input protection, and infotainment power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SMBJ8.5H 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, MOSFETs, and automotive-qualified components since 1979.
The SMBJH series was developed specifically for AEC-Q101-compliant automotive transient suppression, emphasizing robust clamping, low leakage, and process-controlled VBR tightness across temperature for engine control, lighting, and ADAS subsystems.
FAQ
What is the polarity configuration of SMBJ8.5H?
The SMBJ8.5H is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts only during reverse-biased overvoltage events - i.e., when the anode is more negative than the cathode - and blocks up to 8.5V in forward direction. This configuration is confirmed by its "H" suffix (per ordering code table) and electrical specs listing VBR only for uni-directional test conditions.
Does SMBJ8.5H meet ISO 7637-2 Pulse 1 requirements?
Yes, SMBJ8.5H meets ISO 7637-2 Pulse 1 (inductive load dump) requirements as explicitly stated in its FEATURES section. With 600W peak pulse power and 15.9V clamping at 39A, it limits voltage overshoot to well below the 40V immunity threshold specified for Pulse 1 testing on 12V systems, provided layout minimizes inductance in the clamping path.
What is the maximum junction temperature rating for SMBJ8.5H?
The SMBJ8.5H has a maximum junction temperature (TJ max) of +150°C, as specified in the ABSOLUTE MAXIMUM RATINGS table. This enables reliable operation in under-hood automotive environments where ambient temperatures reach +105°C, especially when combined with its RθJC = 10°C/W thermal resistance and proper copper pour on the PCB.
Is SMBJ8.5H RoHS and halogen-free compliant?
Yes, SMBJ8.5H is RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES list. The molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated - satisfying environmental and safety requirements for automotive and industrial end equipment.
How does SMBJ8.5H differ from SMBJ8.5AH?
The SMBJ8.5AH variant offers tighter VBR tolerance (9.44–10.4V vs. 9.44–11.5V for SMBJ8.5H) and slightly lower clamping voltage (14.4V vs. 15.9V at 43A), achieved via enhanced process control. Both share identical VWM (8.5V), package (DO-214AA), and AEC-Q101 qualification - but SMBJ8.5H provides broader VBR distribution for cost-sensitive applications where tighter binning isn't required.
SMBJ8.5H 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:
- 1
- Bidirectional Channels:
- -
- 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)
SMBJ8.5H FAQ
1.How can I place an order for SMBJ8.5H through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5H 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 SMBJ8.5H reliable?
The price and inventory of SMBJ8.5H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5H is usually 5 days.
3.What payment methods are accepted for SMBJ8.5H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5H?
SMBJ8.5H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5H 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 SMBJ8.5H?
For technical support, including SMBJ8.5H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5H requirements.
6.How does Aetrix verify that SMBJ8.5H is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5H 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 SMBJ8.5H meets industry standards.
7.What is the process for return or replacement of SMBJ8.5H?
All SMBJ8.5H units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5H, 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 SMBJ8.5H part is unused and in its original packaging.
Return procedure for SMBJ8.5H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMBJ8.5H Tags
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