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Taiwan Semiconductor Corporation SMBJ8.5AH
- Part No.:
- SMBJ8.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBJ8.5AH.pdf
- Description:
- 600W, 9.9V, UNIDIRECTIONAL, TVS
- Quantity:
- Payment:
- Shipping:
Inventory:3,987
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Product details
Overview
SMBJ8.5AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AA (SMB) package, designed for high-energy ESD and surge protection in automotive and industrial power rails. It features 8.5 V working stand-off voltage (VWM), 9.44–10.4 V breakdown voltage (VBR) at 1 mA, 14.4 V maximum clamping voltage (VC) at 43 A peak pulse current, and 600 W peak pulse power rating with <1.0 ps response time.
For engineers reviewing the SMBJ8.5AH datasheet, SMBJ8.5AH pinout, SMBJ8.5AH application, or SMBJ8.5AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, unidirectional polarity marking, and thermal derating behavior above 25°C ambient.
Technical Context
The SMBJ8.5AH operates as a unidirectional avalanche diode, triggering when reverse voltage exceeds its specified breakdown range (9.44–10.4 V @ 1 mA). Its glass-passivated junction ensures stable leakage (<1 µA at 8.5 V) and robust reliability under repetitive transients.
Thermal performance is defined by RθJC = 10 °C/W and RθJA = 55 °C/W, supporting operation from –55 °C to +150 °C junction temperature. It meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for PCB-mounted surge protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before clamping begins |
| VBR min/max | 9.44 V / 10.4 V @ 1 mA - Confirmed breakdown threshold range for reliable turn-on margin |
| VC @ IPP | 14.4 V @ 43 A - Clamped voltage during 10/1000 µs surge, limiting downstream IC stress |
| PPK | 600 W - Peak pulse power handling per single 10/1000 µs waveform, per Fig. 3 |
| ID @ VWM | <1 µA - Low leakage ensures minimal standby power loss in always-on systems |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures |
| Package | DO-214AA (SMB) - Standardized surface-mount footprint compatible with automated assembly and IPC-7351B land patterns |
Pinout & Package
DO-214AA (SMB) package with cathode band marking on one end; two-terminal unidirectional configuration. Matte tin-plated leads meet J-STD-002 solderability requirements. Polarity is marked via cathode band - critical for correct orientation in DC rail protection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to system ground or low-voltage return path; defines conduction direction |
| Cathode | High-side transient clamp node | Connected to protected line (e.g., 12 V battery rail); absorbs positive surges to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per AEC standard |
| Glass passivated junction | Enhances long-term stability of VBR and leakage under humidity and thermal stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity level 1 | No floor life limitation or baking requirement prior to reflow - simplifies SMT manufacturing |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green electronics manufacturing |
Applications
| Automotive Power Rail Protection | Industrial Sensor Interface Protection |
|---|---|
|
Use Scenario: 12 V battery line in engine control unit (ECU) exposed to load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery input and upstream DC-DC converter input. Use Value: Limits transient voltage to ≤14.4 V during 43 A ISO 7637-2 Pulse 1 events, preventing overvoltage damage to LDOs and microcontrollers. |
Use Scenario: 24 V analog sensor supply line in factory automation PLC I/O module. IC Role / Device Role / Timing Role: Standoff protector on sensor VCC rail, positioned before precision ADC reference buffer. Use Value: Clamps fast EFT bursts (IEC 61000-4-4) to safe levels without affecting 24 V nominal operation due to low 1 µA leakage at 8.5 V. |
| LED Driver Input Protection | Motor Control Board Gate Drive Supply |
|
Use Scenario: Constant-current LED driver input subjected to hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Primary surge limiter on input capacitor node, upstream of buck controller. Use Value: Responds in <1.0 ps to suppress >1 kV ESD strikes, preserving MOSFET gate oxide integrity and maintaining luminance stability. |
Use Scenario: 15 V isolated gate drive supply for IGBT half-bridge in HVAC inverter. IC Role / Device Role / Timing Role: Secondary-level clamp on auxiliary supply rail feeding gate driver IC. Use Value: Prevents latch-up in driver ICs during inductive switching noise coupling, leveraging 150 °C TJ max for sustained thermal margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar unidirectional TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ8.5A | Same DO-214AC (SMA) package; 14.4 V VC @ 43 A; slightly higher RθJA (65 °C/W) | Lower power density due to smaller package; less suitable for high-ambient automotive under-hood use | Prefer SMBJ8.5AH where thermal derating above 25°C is critical and board space allows DO-214AA footprint |
| ON Semiconductor 1.5SMC8.5A | DO-214AB (SMC) package; 14.4 V VC @ 43.3 A; higher PPK (1500 W); larger footprint | Over-spec'd for 600 W requirements; may require PCB layout revision and increased cost | Choose SMBJ8.5AH when 600 W rating and DO-214AA size are optimal for cost, space, and thermal balance |
Compared with SMAJ8.5A and 1.5SMC8.5A, the SMBJ8.5AH delivers identical clamping performance in a thermally superior DO-214AA package, enabling tighter thermal design margins in space-constrained automotive modules without over-engineering.
Availability
SMBJ8.5AH is available at Aetrix Electronics and suitable for automotive ECU designs, industrial PLC I/O protection, LED driver input stages, and motor control gate drive supplies requiring stable component supply and AEC-Q101 assurance.
Supply support for SMBJ8.5AH 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, rectifiers, and MOSFETs for automotive, industrial, and consumer markets.
The SMBJH series was developed specifically for AEC-Q101-compliant transient suppression in harsh-environment 12 V/24 V systems, emphasizing low clamping voltage, fast response, and robust thermal performance in surface-mount packages.
FAQ
What is the polarity configuration of SMBJ8.5AH?
The SMBJ8.5AH is a unidirectional TVS diode with clearly marked cathode band indicating the high-side terminal. When installed with cathode toward the protected line (e.g., 12 V rail) and anode to ground, it clamps positive transients only. This configuration prevents forward conduction during normal operation while ensuring precise reverse breakdown at 9.44–10.4 V. The SMBJ8.5AH does not conduct in forward bias except under surge conditions exceeding its 3.5 V VF rating.
Does SMBJ8.5AH meet automotive qualification standards?
Yes, the SMBJ8.5AH is AEC-Q101 qualified and tested per the full stress test schedule including HTGB, HTRB, TCT, and ESD. It also meets ISO 7637-2 Pulse 1/2a/2b/3a/3b immunity requirements for 12 V vehicle electrical systems. These qualifications are documented in Taiwan Semiconductor's official A2102 datasheet revision and apply specifically to the SMBJ8.5AH variant, not just the broader SMBJH family.
What is the maximum clamping voltage of SMBJ8.5AH under surge conditions?
The SMBJ8.5AH has a maximum clamping voltage (VC) of 14.4 V when subjected to a 10/1000 µs surge waveform with peak current (IPP) of 43 A. This value is measured per ANSI/IEEE C62.35 and confirmed in the Electrical Specifications table on page 2 of the A2102 datasheet. The low VC ensures downstream components such as 16 V-rated DC-DC converters remain within safe operating limits during transient events.
How does SMBJ8.5AH compare to SMBJ8.5H in terms of breakdown voltage?
The SMBJ8.5AH has a tighter breakdown voltage range of 9.44–10.4 V (min/max) at 1 mA test current, whereas the SMBJ8.5H specifies 9.44–11.5 V. This narrower VBR tolerance improves design predictability for systems requiring precise clamping onset, especially in safety-critical automotive applications where margin control is essential. Both share identical VWM (8.5 V), VC (14.4 V), and PPK (600 W) ratings.
Is SMBJ8.5AH suitable for bidirectional transient protection?
No, SMBJ8.5AH is strictly unidirectional and must not be used for bidirectional protection. For bipolar applications, Taiwan Semiconductor specifies parts with "CH" or "CAH" suffixes (e.g., SMBJ8.5CH). Using SMBJ8.5AH in reverse-biased configurations risks failure due to lack of symmetrical breakdown characteristics. Always verify polarity marking and circuit topology before placement - the SMBJ8.5AH cathode band must face the protected line.
SMBJ8.5AH 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:
- 14.4V
- Current - Peak Pulse (10/1000µs):
- 43A
- 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)
SMBJ8.5AH FAQ
1.How can I place an order for SMBJ8.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBJ8.5AH 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 SMBJ8.5AH reliable?
The price and inventory of SMBJ8.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBJ8.5AH is usually 5 days.
3.What payment methods are accepted for SMBJ8.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBJ8.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBJ8.5AH?
SMBJ8.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBJ8.5AH 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 SMBJ8.5AH?
For technical support, including SMBJ8.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBJ8.5AH requirements.
6.How does Aetrix verify that SMBJ8.5AH is sourced from the original manufacturer or authorized distributors?
All SMBJ8.5AH 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 SMBJ8.5AH meets industry standards.
7.What is the process for return or replacement of SMBJ8.5AH?
All SMBJ8.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMBJ8.5AH, 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 SMBJ8.5AH part is unused and in its original packaging.
Return procedure for SMBJ8.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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