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Taiwan Semiconductor Corporation SMBJ85AH
- Part No.:
- SMBJ85AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ85AH.pdf
- Description:
- TVS DIODE 85VWM 137VC DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:3,606
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Product details
Overview
SMBJ85AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, rated for 600W peak pulse power, 85V working stand-off voltage (VWM), and 137V maximum clamping voltage (VC) at 4.6A peak impulse current (IPP); used for automotive ECU and industrial I/O port surge protection per ISO 7637-2 Pulse 1/2a/2b/3a/3b.
For engineers reviewing the SMBJ85AH datasheet, SMBJ85AH pinout, SMBJ85AH application, or SMBJ85AH equivalent, key selection criteria include clamping performance under 10/1000µs transients, AEC-Q101 qualification status, unidirectional polarity marking, and thermal derating behavior above 25°C ambient.
Technical Context
The SMBJ85AH employs a glass-passivated silicon junction optimized for fast response (<1.0ps) to high-voltage transients while maintaining low leakage (<1µA at 85V). Its unidirectional configuration enables asymmetric clamping-forward conduction only during reverse overvoltage events-making it suitable for DC-biased signal and power lines.
Thermal design relies on RθJC = 10°C/W and RθJA = 55°C/W, with junction temperature rated from –55°C to +150°C. It meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow without preconditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 85 V - Maximum continuous reverse operating voltage before clamping initiates; defines safe DC bias margin. |
| VBR min/max | 94.4 V / 104 V - Breakdown occurs within this range at 1 mA test current; ensures consistent turn-on threshold. |
| VC @ IPP | 137 V at 4.6 A - Clamped voltage during 10/1000µs surge; determines protected circuit's maximum transient exposure. |
| PPK | 600 W - Peak pulse power handling capability; validates robustness against ISO 7637-2 Pulse 5a surges. |
| ID @ VWM | <1 µA - Reverse leakage at rated stand-off voltage; critical for low-power sensor interface integrity. |
| TJ max | +150 °C - Maximum junction temperature; supports under-hood automotive placement with thermal margin. |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; matte tin-plated leads compliant with J-STD-002 solderability; weight ≈ 0.090 g; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., GND or return path) in unidirectional TVS configuration. |
| Cathode | Clamping terminal | Marked with band; connected to protected line (e.g., CAN_H, LIN, 12V rail); conducts during reverse overvoltage. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test requirements including HTOL, TCT, and ESD HBM/MM. |
| Glass passivated junction | Enables stable VBR tolerance and long-term reliability under humidity and thermal cycling. |
| Fast response time <1.0 ps | Clamps transients before sensitive downstream ICs experience damaging voltage overshoot. |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling). |
| Moisture sensitivity level 1 | Zero floor life limitation; no baking required prior to SMT reflow assembly. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Module |
|---|---|
Use Scenario: Protects microcontroller GPIO and LIN bus transceivers from load-dump and inductive kickback in vehicle door modules. IC Role / Device Role: Unidirectional TVS placed between LIN line and ground, with cathode tied to LIN. Use Value: Limits transient voltage to ≤137 V during ISO 7637-2 Pulse 5a (12V system), preserving transceiver functionality. |
Use Scenario: Shields 24V digital input optocoupler front-end from field-wiring EFT bursts and relay contact bounce. IC Role / Device Role: Standoff-clamp device across input terminals, referenced to common ground. Use Value: Maintains <1 µA leakage at 24V nominal, ensuring accurate logic-level detection under steady-state conditions. |
| Automotive Lighting Control Unit | Smart Sensor Node Power Rail |
Use Scenario: Safeguards LED driver ICs and CAN transceivers in headlamp control units exposed to battery reverse connection and jump-start surges. IC Role / Device Role: Primary clamping element on 12V supply rail, cathode to rail, anode to chassis ground. Use Value: Withstands 600W 10/1000µs pulses without degradation, meeting OEM EMC validation requirements. |
Use Scenario: Guards ultra-low-power MCU supply pins (e.g., 3.3V LDO output) against ESD and board-level coupling noise. IC Role / Device Role: Secondary protection stage after primary bulk TVS; placed close to IC VDD pin. Use Value: Delivers 137V clamping at 4.6A while adding only 0.09g mass and minimal PCB area in SMB footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ85A | VBR min/max = 94.4–104.4 V; VC = 137 V @ 4.6 A; same DO-214AC (SMA) package; 400W PPK rating. | Lower peak power handling limits use in high-energy automotive load-dump scenarios. | Select when space-constrained layouts require smaller SMA footprint and energy demands are ≤400W. |
| ON Semiconductor 1.5SMC85A | VBR min/max = 94.4–104.4 V; VC = 137 V @ 4.6 A; DO-214AB (SMC) package; 1500W PPK rating. | Larger SMC package occupies more PCB area but supports higher surge repetition rates. | Choose for industrial motor drives requiring repeated 10/1000µs surges where thermal recovery is critical. |
Compared with SMAJ85A and 1.5SMC85A, the SMBJ85AH delivers identical clamping performance at 600W in the intermediate SMB footprint-balancing surge robustness, PCB area, and AEC-Q101 compliance for automotive body electronics.
Availability
SMBJ85AH is available at Aetrix Electronics and suitable for automotive electronic control units, industrial programmable logic controllers, lighting control systems, and smart sensor nodes requiring stable component supply across extended temperature and surge environments.
Supply support for SMBJ85AH 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 automotive and industrial markets.
The SMBJH series was designed specifically for AEC-Q101-compliant transient suppression in harsh automotive environments-including engine bays, lighting systems, and body electronics-with emphasis on ISO 7637-2 immunity and moisture-resistant packaging.
FAQ
What is the breakdown voltage range of the SMBJ85AH?
The SMBJ85AH has a minimum breakdown voltage (VBR) of 94.4 V and a maximum of 104 V at 1 mA test current, measured per ANSI/IEEE C62.35. This tight VBR window ensures predictable clamping onset across production lots and temperature ranges, critical for protecting 85V-rated circuits without premature conduction.
Is the SMBJ85AH suitable for bidirectional transient protection?
No-the SMBJ85AH is a unidirectional TVS diode, indicated by the "H" suffix and cathode band marking. For bidirectional protection, Taiwan Semiconductor offers the SMBJ85CH variant. Using SMBJ85AH in AC-coupled or bipolar signal paths risks forward conduction during normal operation and inadequate clamping in one polarity.
Does the SMBJ85AH meet AEC-Q101 requirements?
Yes, the SMBJ85AH is explicitly AEC-Q101 qualified per the manufacturer's datasheet (Version A2102). It has passed stress tests including high-temperature operating life (HTOL), temperature cycling (TCT), and human-body-model ESD (HBM ≥8 kV), making it suitable for automotive powertrain, chassis, and body electronics applications.
What is the maximum clamping voltage of the SMBJ85AH under surge conditions?
The SMBJ85AH clamps to a maximum of 137 V when subjected to a 10/1000 µs surge waveform at 4.6 A peak impulse current (IPP). This value is guaranteed across temperature and lot variations, enabling reliable margin calculation for downstream ICs rated to withstand ≤150 V transients.
How does the SMBJ85AH compare to standard SMBJ85A in terms of surge rating?
The SMBJ85AH differs from the base SMBJ85A by its enhanced construction: glass passivation, AEC-Q101 qualification, and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b. While both share identical VWM (85 V) and VC (137 V), only SMBJ85AH is certified for automotive-grade reliability and moisture resistance (MSL Level 1).
SMBJ85AH 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):
- 85V
- Voltage - Breakdown (Min):
- 94.4V
- Voltage - Clamping (Max) @ Ipp:
- 137V
- Current - Peak Pulse (10/1000µs):
- 4.6A
- 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)
SMBJ85AH FAQ
1.How can I place an order for SMBJ85AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ85AH 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 SMBJ85AH reliable?
The price and inventory of SMBJ85AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ85AH is usually 5 days.
3.What payment methods are accepted for SMBJ85AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ85AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ85AH?
SMBJ85AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ85AH 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 SMBJ85AH?
For technical support, including SMBJ85AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ85AH requirements.
6.How does Aetrix verify that SMBJ85AH is sourced from the original manufacturer or authorized distributors?
All SMBJ85AH 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 SMBJ85AH meets industry standards.
7.What is the process for return or replacement of SMBJ85AH?
All SMBJ85AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ85AH, 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 SMBJ85AH part is unused and in its original packaging.
Return procedure for SMBJ85AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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