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Taiwan Semiconductor Corporation 1.5SMC75AH
- Part No.:
- 1.5SMC75AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC75AH.pdf
- Description:
- TVS DIODE 64.1VWM 103VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,829
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Product details
Overview
1.5SMC75AH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for high-energy surge protection in DC power lines and signal interfaces. It features a 71.3–78.8 V breakdown voltage (VBR), 64.1 V working stand-off voltage (VWM), 15 A peak pulse current (IPPM), 103 V clamping voltage (VC), and 1500 W peak pulse power (PPK) - optimized for automotive load-dump and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance in engine control units.
For engineers reviewing the 1.5SMC75AH datasheet, 1.5SMC75AH pinout, 1.5SMC75AH application, or 1.5SMC75AH equivalent, key selection criteria include clamping performance under 10/1000 µs surge, unidirectional polarity marking, DO-214AB package thermal resistance (RθJC = 15 °C/W), and AEC-Q101 qualification for automotive-grade reliability.
Technical Context
The 1.5SMC75AH operates as a unidirectional avalanche diode with glass-passivated junction, enabling fast response (<1.0 ps) to transients while maintaining low leakage (<1 µA at 64.1 V). Its thermal design supports junction temperatures from –55 °C to +150 °C, with RθJA = 50 °C/W and RθJC = 15 °C/W for PCB-level thermal management.
It meets ISO 7637-2 test pulses for automotive electronics and complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1. The device uses matte tin-plated leads per J-STD-002 and UL 94V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 71.3 V / 78.8 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current; ensures consistent clamping threshold across production lots |
| VWM | 64.1 V - maximum continuous reverse operating voltage; must exceed system nominal voltage (e.g., 48 V or 60 V DC bus) to prevent leakage during normal operation |
| VC@IPPM | 103 V - clamped voltage at 15 A peak pulse (10/1000 µs); determines maximum stress imposed on downstream ICs during surge events |
| PPK | 1500 W - peak pulse power handling capability; enables protection against high-energy transients like ISO 7637-2 Pulse 5a (load dump) |
| IPPM | 15 A - peak impulse current rating (10/1000 µs waveform); sets physical layout requirements for trace width and grounding |
| RθJC | 15 °C/W - junction-to-case thermal resistance; critical for heatsinking via PCB copper pour or metal-core substrate in high-reliability automotive modules |
| TJMAX | +150 °C - maximum junction temperature; allows operation in under-hood environments without derating at ambient ≤125 °C |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0 flammability rating; terminals are matte tin-plated and solderable per J-STD-002.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input side of protected line (e.g., battery feed) | Connected to source of transient energy; must be routed with low-inductance path to minimize overshoot during clamping |
| Cathode | Clamp node tied to ground or reference rail | Provides low-impedance return path during surge; requires direct connection to solid ground plane with minimal loop area |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive applications including powertrain and body electronics; eliminates need for additional qualification testing |
| Glass passivated junction | Enhances long-term stability and moisture resistance vs. epoxy-passivated alternatives; improves reliability in humid under-hood environments |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Guarantees robustness against real-world automotive transients including alternator load dump, inductive switching, and ESD coupling |
| Fast response time <1.0 ps | Enables sub-nanosecond clamping onset; protects sensitive CAN/LIN transceivers and microcontrollers before damage thresholds are exceeded |
| Moisture Sensitivity Level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Protecting 5 V and 12 V sensor supply rails from load dump and relay coil flyback in gasoline/diesel ECUs. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and LDO regulator input. Use Value: Limits transient voltage to ≤103 V during ISO 7637-2 Pulse 5a (12 V system), preventing LDO overvoltage failure and ensuring MCU reset integrity. |
Use Scenario: Safeguarding 24 V digital input channels in programmable logic controllers exposed to field wiring surges. IC Role / Device Role / Timing Role: Primary surge suppression on dry-contact inputs before optocoupler or Schmitt trigger interface. Use Value: Clamps 1 kV/500 A transients (10/1000 µs) to <103 V, preserving input logic state and avoiding false triggering or latch-up. |
| Telecom Power Supply Input | Medical Diagnostic Equipment Interface |
|
Use Scenario: Secondary protection on 48 V DC telecom rectifier outputs feeding base station radios. IC Role / Device Role / Timing Role: Back-to-back placement with upstream MOV for coordinated staged clamping. Use Value: Provides precise 103 V clamping with <1 µA leakage at 64.1 V, minimizing standby power loss while meeting GR-1089-CORE immunity requirements. |
Use Scenario: Surge hardening of USB and RS-232 ports on ultrasound and MRI console front panels. IC Role / Device Role / Timing Role: Point-of-entry protection on shielded cable connectors before ESD-rated transceivers. Use Value: Delivers <1.0 ps response and 1500 W peak power handling to absorb IEC 61000-4-5 Level 4 surges without degrading signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A (Bourns) | Same DO-214AA package; lower PPK = 600 W; VC = 121 V @ 10.3 A | Not rated for ISO 7637-2 Pulse 5a; suitable only for lower-energy transients (e.g., ESD, data-line surges) | Select SMBJ75A only when peak surge energy is ≤600 W and clamping voltage margin permits higher VC. |
| SMCJ75A (Littelfuse) | Identical DO-214AB package; PPK = 1500 W; VC = 119 V @ 12.6 A; no AEC-Q101 certification | Lacks automotive qualification; requires customer-level reliability validation for automotive use | Choose SMCJ75A for industrial or telecom applications where AEC-Q101 is not mandated and 119 V clamping is acceptable. |
Compared with SMBJ75A and SMCJ75A, the 1.5SMC75AH delivers tighter clamping (103 V vs. ≥119 V), AEC-Q101 qualification, and verified ISO 7637-2 compliance - making it the preferred choice for automotive power rail protection where system-level immunity and qualification traceability are mandatory.
Availability
1.5SMC75AH is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and telecom power supply inputs requiring stable component supply, AEC-Q101 assurance, and 1500 W transient immunity.
Supply support for 1.5SMC75AH 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 power management devices.
The 1.5SMC75AH belongs to TSC's AEC-Q101-qualified SMC-series TVS portfolio, engineered specifically for automotive-grade DC power line protection with emphasis on clamping precision, thermal robustness, and ISO 7637-2 compliance.
FAQ
What is the polarity configuration of the 1.5SMC75AH?
The 1.5SMC75AH is a unidirectional TVS diode with cathode band marking indicating the cathode terminal. It conducts only during reverse-biased overvoltage events and blocks forward current up to 3.5 V at 50 A, as specified for the 1.5SMC6.8H–1.5SMC91H family. This polarity enables precise DC rail protection without interfering with normal forward operation.
Does the 1.5SMC75AH meet automotive qualification standards?
Yes, the 1.5SMC75AH is AEC-Q101 qualified and explicitly tested to meet ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b transient immunity requirements. Its qualification covers temperature cycling, humidity testing, and mechanical shock - confirming suitability for under-hood and chassis-mounted automotive electronics.
What is the maximum clamping voltage of the 1.5SMC75AH under surge conditions?
The 1.5SMC75AH has a maximum clamping voltage (VC) of 103 V at 15 A peak pulse current (IPPM) with a 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
How does the 1.5SMC75AH compare to bidirectional variants like 1.5SMC75CAH?
The 1.5SMC75AH is unidirectional and intended for DC line protection, whereas 1.5SMC75CAH is bidirectional for AC or dual-polarity signal lines. The 1.5SMC75AH offers lower leakage (<1 µA at 64.1 V) and tighter VBR tolerance (71.3–78.8 V) than its bidirectional counterpart, making it optimal for asymmetric voltage rails where reverse conduction must be strictly controlled.
What package type and mounting method does the 1.5SMC75AH use?
The 1.5SMC75AH uses the DO-214AB (SMC) surface-mount package with matte tin-plated leads compliant with J-STD-002 solderability standards. It is designed for automated pick-and-place assembly and reflow soldering, with polarity indicated by a cathode band and moisture sensitivity level 1 per J-STD-020 - enabling unlimited floor life before assembly.
1.5SMC75AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- 1.5SMC
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 64.1V
- Voltage - Breakdown (Min):
- 71.3V
- Voltage - Clamping (Max) @ Ipp:
- 103V
- Current - Peak Pulse (10/1000µs):
- 15A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC75AH FAQ
1.How can I place an order for 1.5SMC75AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC75AH 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 1.5SMC75AH reliable?
The price and inventory of 1.5SMC75AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC75AH is usually 5 days.
3.What payment methods are accepted for 1.5SMC75AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC75AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC75AH?
1.5SMC75AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC75AH 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 1.5SMC75AH?
For technical support, including 1.5SMC75AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC75AH requirements.
6.How does Aetrix verify that 1.5SMC75AH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC75AH 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 1.5SMC75AH meets industry standards.
7.What is the process for return or replacement of 1.5SMC75AH?
All 1.5SMC75AH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC75AH, 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 1.5SMC75AH part is unused and in its original packaging.
Return procedure for 1.5SMC75AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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