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Taiwan Semiconductor Corporation SMF75AH
- Part No.:
- SMF75AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- SOD-123W
- Datasheet:
-
SMF75AH.pdf
- Description:
- TVS DIODE 75VWM 121VC SOD123W
- Quantity:
- Payment:
- Shipping:
Inventory:7,692
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Product details
Overview
SMF75AH from Taiwan Semiconductor is a unidirectional surface-mount Transient Voltage Suppressor (TVS) diode designed for automotive-grade circuit protection. It features a 75 V working stand-off voltage (VWM), 83.3–92.1 V breakdown voltage (VBR), 121 V clamping voltage (VC) at 1.45 A peak pulse current, and 200 W peak pulse power (10/1000 µs waveform). It is used to protect automotive lighting control modules and ECU power rails against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMF75AH datasheet, SMF75AH pinout, SMF75AH application, or SMF75AH equivalent, key selection criteria include its AEC-Q101 qualification, SOD-123W package compatibility with automated placement, low IR (<1 µA @ 75 V), and verified clamping performance under standardized automotive surge waveforms.
Technical Context
The SMF75AH operates as a unidirectional avalanche diode, conducting only in reverse bias above its breakdown threshold to shunt transient energy to ground. Its photo-glass passivated junction ensures stable VBR tolerance and long-term reliability under thermal cycling.
It meets ISO 7637-2 immunity requirements for automotive electronics, with validated clamping response to Pulse 1 (inductive load dump), Pulse 2a (battery disconnect), and Pulse 3a/3b (capacitive coupling transients), and is rated for continuous operation from –55 °C to +175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 75 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min / max | 83.3 V / 92.1 V - Breakdown occurs within this range at 1 mA test current; defines turn-on threshold consistency |
| VC @ IPPM | 121 V - Clamped voltage at 1.45 A peak pulse current; determines maximum stress on protected IC |
| PPPM | 200 W - Peak pulse power handling (10/1000 µs waveform); supports high-energy automotive transients |
| IR @ VWM | <1 µA - Reverse leakage at 75 V; ensures minimal standby power loss in always-on systems |
| TJ max | +175 °C - Maximum junction temperature; enables under-hood deployment without derating |
| Package | SOD-123W - Surface-mount outline with enhanced thermal pad; compatible with IPC-7351B footprint |
Pinout & Package
SOD-123W package: 2-terminal surface-mount device with cathode band marking polarity; matte tin-plated leads, J-STD-002 solderable; 0.016 g weight; UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path; completes clamping loop during transient |
| Cathode | Protected line input | Connected to supply rail or signal line being protected; conducts when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications per stress test requirements including HTOL, TCT, and HAST |
| Photo-glass passivated junction | Ensures stable VBR over lifetime and resistance to humidity-induced parameter drift |
| Clamping voltage ≤121 V @ 1.45 A | Provides predictable overvoltage limiting margin for 75 V nominal 12 V/24 V automotive systems |
| Moisture sensitivity level 1 | Enables standard SMT reflow without baking; eliminates production delays and moisture-related failures |
| ISO 7637-2 compliance | Guarantees robustness against real-world vehicle electrical disturbances including load dump and inductive switching |
Applications
| Automotive Lighting Control | Body Control Module (BCM) Power Rail |
|---|---|
Use Scenario: Protecting LED driver ICs and MOSFET switches in headlamp and tail lamp assemblies from load-dump transients during battery disconnection. IC Role / Device Role / Timing Role: Unidirectional TVS placed between supply rail and ground to clamp surges before they reach downstream regulators and drivers. Use Value: Prevents latch-up or permanent damage to 5 V/3.3 V logic supplies by limiting peak voltage to 121 V during 10/1000 µs pulses up to 200 W. | Use Scenario: Safeguarding microcontroller power inputs and CAN transceiver VCC pins in BCMs exposed to alternator ripple and relay coil flyback. IC Role / Device Role / Timing Role: Standoff protector on 5 V or 12 V supply lines; activated only during transients >75 V, remaining inert during normal operation. Use Value: Maintains system uptime by absorbing ISO 7637-2 Pulse 2a (100 V, 50 ms) and Pulse 3b (±200 V, 150 ns) without degrading baseline leakage (<1 µA). |
| Engine Control Unit (ECU) Sensor Interface | Infotainment System USB Power Line |
Use Scenario: Shielding analog sensor signal conditioning circuits (e.g., MAP, TPS) from coupled transients on shared harnesses near ignition coils. IC Role / Device Role / Timing Role: Low-capacitance TVS on 5 V reference or sensor supply lines; suppresses fast-rising EFT bursts while preserving signal integrity. Use Value: Enables reliable operation in harsh EMI environments by meeting Electrical Fast Transient (EFT) immunity per IEC 61000-4-4 with <121 V clamping ceiling. | Use Scenario: Protecting USB Type-C VBUS lines in vehicle infotainment head units from hot-swap surges and cable-induced transients. IC Role / Device Role / Timing Role: Primary overvoltage clamp on 5 V VBUS rail; coordinates with internal OVP circuitry to prevent port controller damage. Use Value: Supports automotive-grade USB compliance by sustaining 200 W peak pulses without degradation, verified across –40 °C to +125 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Littelfuse SMAJ75A | Same SOD-123 package; 75 V VWM, but higher VC = 126 V @ 1.4 A; slightly lower PPPM = 400 W (but rated at 10/1000 µs) | Marginally higher clamping voltage may reduce protection margin for 5 V logic rails downstream of LDOs | Select SMAJ75A if higher peak power headroom is required and layout allows minor VC increase |
| Vishay SMBJ75A | SMB package (larger footprint); 75 V VWM, VC = 121 V @ 1.45 A; same clamping but requires PCB redesign | Not drop-in due to SMB vs. SOD-123W footprint mismatch; unsuitable for space-constrained automotive modules | Choose SMBJ75A only when thermal dissipation >200 W is needed and board area permits larger package |
Compared with SMAJ75A and SMBJ75A, the SMF75AH delivers identical clamping performance (121 V) in the smaller SOD-123W footprint, supports AEC-Q101 and ISO 7637-2 out-of-box, and enables direct integration into compact automotive ECUs without layout revision.
Availability
SMF75AH is available at Aetrix Electronics and suitable for automotive lighting control, body control module (BCM) power rail protection, and engine control unit (ECU) sensor interface applications requiring stable component supply and full AEC-Q101 traceability.
Supply support for SMF75AH 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 AEC-Q101 validation capability.
The SMF75AH belongs to TSC's SMF-AH series of automotive-qualified TVS diodes, engineered specifically for ISO 7637-2-compliant transient suppression in 12 V/24 V vehicle electrical systems.
FAQ
What is the clamping voltage of the SMF75AH under standard test conditions?
The SMF75AH has a maximum clamping voltage (VC) of 121 V when subjected to a 10/1000 µs peak pulse current of 1.45 A. This value is measured per JEDEC standards and confirmed in the official TSC datasheet Version A2103. The clamping behavior ensures downstream ICs see no more than 121 V during surge events, making SMF75AH suitable for protecting 75 V-rated circuits in automotive power domains.
Is the SMF75AH qualified for automotive use?
Yes, the SMF75AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements. Its construction-including photo-glass passivated junction, SOD-123W package with J-STD-002 solderability, and –55 °C to +175 °C operating range-confirms its suitability for under-hood and chassis-mounted automotive electronics where reliability under thermal and electrical stress is critical. SMF75AH is not a generic TVS; it is automotive-grade by design and validation.
What package does the SMF75AH use, and is it compatible with automated assembly?
The SMF75AH uses the SOD-123W surface-mount package, featuring matte tin-plated leads compliant with J-STD-002 for solderability and JESD201 Class 2 whisker resistance. Its standardized footprint supports high-speed pick-and-place equipment and reflow soldering without pre-baking (MSL Level 1). The SOD-123W outline is documented in TSC's Package Outline Dimensions drawing, and the SMF75AH marking code "2W075" is laser-etched for automated optical inspection compatibility.
How does the SMF75AH compare to the SMF70AH and SMF80AH in terms of voltage rating?
The SMF75AH has a 75 V working stand-off voltage (VWM), positioned between SMF70AH (70 V VWM) and SMF80AH (80 V VWM). Its breakdown voltage range is 83.3–92.1 V, versus 77.8–86 V for SMF70AH and 88.9–98.3 V for SMF80AH. All three share identical 200 W PPPM and SOD-123W packaging, allowing voltage-tiered selection based on system nominal voltage and margin requirements-e.g., SMF75AH is optimal for 72 V battery systems or 60–75 V regulated rails.
Does the SMF75AH have halogen-free and RoHS-compliant construction?
Yes, the SMF75AH is both RoHS compliant and halogen-free per IEC 61249-2-21. Its molding compound meets UL 94V-0 flammability rating, and all materials-including lead frame and die attach-are certified to EU Directive 2011/65/EU and JEDEC J-STD-020 moisture sensitivity Level 1. These attributes are verified in TSC's official documentation and supported by material declarations available upon request for SMF75AH procurement.
SMF75AH 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):
- 75V
- Voltage - Breakdown (Min):
- 83.3V
- Voltage - Clamping (Max) @ Ipp:
- 121V
- Current - Peak Pulse (10/1000µs):
- 1.45A
- 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
SMF75AH FAQ
1.How can I place an order for SMF75AH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMF75AH 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 SMF75AH reliable?
The price and inventory of SMF75AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMF75AH is usually 5 days.
3.What payment methods are accepted for SMF75AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMF75AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMF75AH?
SMF75AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMF75AH 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 SMF75AH?
For technical support, including SMF75AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMF75AH requirements.
6.How does Aetrix verify that SMF75AH is sourced from the original manufacturer or authorized distributors?
All SMF75AH 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 SMF75AH meets industry standards.
7.What is the process for return or replacement of SMF75AH?
All SMF75AH units undergo pre-shipment inspection (PSI). If there is an issue with SMF75AH, 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 SMF75AH part is unused and in its original packaging.
Return procedure for SMF75AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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