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Taiwan Semiconductor Corporation SMF8.5AH
- Part No.:
- SMF8.5AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF8.5AH.pdf
- Description:
- 200W, 10V, 5%, UNIDIRECTIONAL, T
- Quantity:
- Payment:
- Shipping:
Inventory:9,277
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Product details
Overview
SMF8.5AH from Taiwan Semiconductor is a unidirectional transient voltage suppressor diode (TVS) designed for automotive-grade circuit protection. It features a 8.5 V working stand-off voltage, 9.44–10.5 V breakdown voltage at 1 mA test current, 13.9 V clamping voltage at 10 A peak pulse current, and 200 W peak pulse power (10/1000 µs waveform), protecting sensitive electronics in automotive lighting and ECU power rails.
For engineers reviewing the SMF8.5AH datasheet, SMF8.5AH pinout, SMF8.5AH application, or SMF8.5AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, AEC-Q101 qualification, SOD-123W package thermal resistance (RθJL = 33 °C/W), and low reverse leakage (<1 µA at 8.5 V).
Technical Context
The SMF8.5AH operates as a unidirectional avalanche diode with glass-passivated junction for stable breakdown behavior and high reliability in harsh environments. Its clamping action begins above 9.44 V (VBR min) and limits transient energy to ≤13.9 V at 10 A, enabling robust protection of 12 V automotive systems against load dump and inductive switching spikes.
Designed per AEC-Q101, it meets ISO 7637-2 immunity requirements for Pulse 1 (inductive flyback), Pulse 2a (battery disconnect), Pulse 2b (alternator load dump), and Pulse 3a/3b (capacitive coupling). Its SOD-123W package supports automated placement and delivers RθJA = 100 °C/W on a 5 mm × 5 mm Cu pad PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 8.5 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR @ IT = 1 mA | 9.44–10.5 V - Ensures reliable turn-on during transients while avoiding false triggering |
| VC @ IPPM = 10 A | 13.9 V - Limits downstream IC voltage stress during 10/1000 µs surge events |
| PPPM | 200 W - Peak pulse power handling capability compliant with ISO 7637-2 Pulse 2b |
| IR @ VWM | <1 µA - Negligible standby power loss in always-on automotive modules |
| Junction Temp Range | −55 °C to +175 °C - Supports operation in engine bay and under-hood environments |
Pinout & Package
Package: SOD-123W - Surface-mount plastic package with matte tin-plated leads, UL 94V-0 molding compound, polarity indicated by cathode band, weight ≈ 0.016 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction | Connected to ground or low-side return path in unidirectional TVS configuration |
| Cathode | Current exit point during forward conduction; high-impedance terminal during reverse bias | Connected to protected line (e.g., 12 V rail); clamps transients to anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive use including temperature cycling, humidity, and mechanical shock per JESD22 standards |
| Glass-passivated junction | Ensures stable VBR tolerance and long-term reliability under thermal stress |
| ISO 7637-2 compliance | Guarantees immunity to standardized automotive transients (Pulse 1/2a/2b/3a/3b) |
| SOD-123W package | Enables high-density PCB layout and compatibility with standard reflow profiles (MSL Level 1) |
Applications
| Automotive Lighting Systems | Engine Control Unit (ECU) Power Rails |
|---|---|
Use Scenario: Protecting LED driver ICs and microcontrollers from load-dump transients during headlamp switching. IC Role / Device Role / Timing Role: Unidirectional TVS placed between 12 V supply and ground to clamp voltage excursions above 13.9 V. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic supplies downstream of DC-DC converters. | Use Scenario: Safeguarding CAN transceiver power inputs against battery disconnection spikes (ISO 7637-2 Pulse 2a). IC Role / Device Role / Timing Role: Standby protection device with <1 µA leakage, ensuring no impact on low-power sleep modes. Use Value: Maintains system-level EMC compliance without increasing quiescent current budget. |
| Body Control Modules (BCM) | Infotainment Power Inputs |
Use Scenario: Shielding LIN bus interface ICs from inductive switching noise generated by door lock actuators. IC Role / Device Role / Timing Role: Fast-response clamping element with 10/1000 µs waveform capability (200 W PPPM). Use Value: Limits transient duration to sub-millisecond levels, preventing communication errors or reset events. | Use Scenario: Suppressing ESD and fast transients on USB or HDMI power lines in center-stack displays. IC Role / Device Role / Timing Role: Secondary overvoltage protection stage after primary input filter capacitors. Use Value: Adds margin beyond bulk capacitance alone, reducing risk of overvoltage failure during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ8.5A (Bourns) | Same VWM (8.5 V), higher VC (13.4 V @ 10.3 A), SMB package (larger footprint, RθJA = 50 °C/W) | Higher thermal mass suits higher ambient temp but requires more board area | Prefer SMBJ8.5A only if PCB layout allows larger SMC/SMB footprint and higher steady-state power dissipation is needed |
| P6SMB8.5A (ON Semiconductor) | Identical VWM/VBR/VC, same SOD-123W package, but not AEC-Q101 qualified | Lacks automotive qualification; suitable for industrial/commercial designs only | Select P6SMB8.5A only for non-automotive applications where AEC-Q101 is not required |
Compared with SMBJ8.5A and P6SMB8.5A, the SMF8.5AH provides AEC-Q101 validation and optimized thermal performance in the compact SOD-123W package-critical for space-constrained automotive modules requiring guaranteed reliability across −40 °C to +125 °C ambient.
Availability
SMF8.5AH is available at Aetrix Electronics and suitable for automotive lighting systems, engine control units, body control modules, and infotainment power inputs requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF8.5AH 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, and rectifiers with global distribution and automotive qualification capabilities.
The SMF series is engineered specifically for AEC-Q101-compliant transient protection in 12 V and 24 V automotive electrical systems, emphasizing low clamping voltage, high surge robustness, and SMT manufacturability.
FAQ
What is the clamping voltage of the SMF8.5AH at its rated peak pulse current?
The SMF8.5AH has a maximum clamping voltage (VC) of 13.9 V when subjected to a 10 A peak pulse current with a 10/1000 µs waveform. This value is measured per JEDEC standards and ensures downstream components see limited overvoltage during ISO 7637-2 Pulse 2b events. The SMF8.5AH maintains this clamping performance across its specified junction temperature range.
Is the SMF8.5AH qualified for automotive applications?
Yes, the SMF8.5AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its construction-including glass-passivated junction, SOD-123W package, and −55 °C to +175 °C junction temperature rating-supports deployment in under-hood and cabin automotive modules. The SMF8.5AH data sheet confirms full qualification status.
What package does the SMF8.5AH use, and what are its mounting characteristics?
The SMF8.5AH uses the SOD-123W surface-mount package with matte tin-plated leads, UL 94V-0 molding compound, and cathode band polarity marking. It is compatible with standard reflow soldering profiles and rated MSL Level 1 per J-STD-020. The SMF8.5AH achieves RθJL = 33 °C/W and RθJA = 100 °C/W when mounted on a 5 mm × 5 mm copper pad PCB.
How does the SMF8.5AH compare to the SMF8.0AH in terms of voltage ratings?
The SMF8.5AH has a higher working stand-off voltage (8.5 V vs. 8.0 V) and breakdown voltage range (9.44–10.5 V vs. 8.89–9.83 V) than the SMF8.0AH. Its clamping voltage is also higher (13.9 V vs. 13.6 V at 10 A), making the SMF8.5AH better suited for systems where tighter margin above nominal 12 V rail is required. Both share identical package, power rating, and qualification.
Does the SMF8.5AH have a bidirectional variant?
No, the SMF8.5AH is a unidirectional TVS diode only. Taiwan Semiconductor offers bidirectional variants in the same SMF family under different part numbers (e.g., SMF8.5A for bidirectional), which feature symmetrical breakdown in both polarities and distinct marking codes. The SMF8.5AH's marking code "2W8P5" and electrical specifications confirm its unidirectional configuration.
SMF8.5AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- SOD-123W
- Series:
- SMF
- 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):
- 13.9A
- Power - Peak Pulse:
- 200W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-123W
SMF8.5AH FAQ
1.How can I place an order for SMF8.5AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF8.5AH 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 SMF8.5AH reliable?
The price and inventory of SMF8.5AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF8.5AH is usually 5 days.
3.What payment methods are accepted for SMF8.5AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF8.5AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF8.5AH?
SMF8.5AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF8.5AH 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 SMF8.5AH?
For technical support, including SMF8.5AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF8.5AH requirements.
6.How does Aetrix verify that SMF8.5AH is sourced from the original manufacturer or authorized distributors?
All SMF8.5AH 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 SMF8.5AH meets industry standards.
7.What is the process for return or replacement of SMF8.5AH?
All SMF8.5AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF8.5AH, 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 SMF8.5AH part is unused and in its original packaging.
Return procedure for SMF8.5AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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