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Taiwan Semiconductor Corporation 1.5SMC120A
- Part No.:
- 1.5SMC120A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC120A.pdf
- Description:
- TVS DIODE 102VWM 165VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:8,148
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Product details
Overview
1.5SMC120A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for robust overvoltage protection in power rails and signal lines. It features a 120 V breakdown voltage (114–126 V), 102 V working stand-off voltage, 165 V maximum clamping voltage at 9.5 A peak pulse current, and 1500 W peak pulse power dissipation - enabling reliable surge immunity in industrial power supplies and telecom interfaces.
For engineers reviewing the 1.5SMC120A datasheet, 1.5SMC120A pinout, 1.5SMC120A application, or 1.5SMC120A equivalent, key selection criteria include clamping performance under IEC 61000-4-5 surge conditions, thermal derating above 25°C ambient, junction-to-case thermal resistance (15 °C/W), and compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics.
Technical Context
The 1.5SMC120A employs a glass-passivated silicon junction optimized for fast transient response (<1.0 ps) and low leakage (<1 µA at 102 V). Its unidirectional configuration provides asymmetric conduction - blocking up to 102 V in reverse bias and conducting only during positive overvoltage events on the anode-cathode path.
Thermally, it supports continuous operation from –55 °C to +150 °C junction temperature, with junction-to-ambient thermal resistance of 50 °C/W and junction-to-case of 15 °C/W. The DO-214AB (SMC) package enables automated placement while meeting UL 94V-0 flammability and JESD 201 Class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Peak Pulse Power (PPK) | 1500 W - sustains 10/1000 µs surge waveforms per IEC 61000-4-5 without failure |
| Working Stand-off Voltage (VWM) | 102 V - maximum DC or RMS voltage the device blocks continuously without leakage exceeding 1 µA |
| Breakdown Voltage (VBR) | 114–126 V @ 1 mA - voltage range at which device enters avalanche conduction with <30 ms square-wave test current |
| Clamping Voltage (VC) | 165 V @ 9.5 A - maximum voltage seen across protected circuit during 10/1000 µs surge event |
| Junction Temperature Range (TJ) | –55 °C to +150 °C - defines operating envelope for reliability in harsh environments like engine control units |
| Thermal Resistance (RθJC) | 15 °C/W - enables effective heat transfer to PCB copper pour or heatsink for sustained surge duty cycles |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads, RoHS-compliant and halogen-free per IEC 61249-2-21.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side terminal | Connected to protected line (e.g., 48 V telecom rail); conducts during positive overvoltage transients |
| Cathode | Output/Load side terminal | Connected to ground or return path; marked by molded band; defines polarity-sensitive clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| Clamping Performance | 165 V max VC at 9.5 A IPPM ensures downstream ICs (e.g., RS-485 transceivers) remain below absolute maximum ratings during 1 kV/0.5 Ω surge |
| Response Time | <1.0 ps enables suppression before ESD or lightning-induced transients propagate into sensitive analog front-ends |
| Leakage Control | <1 µA IR at 102 V minimizes standby power loss in battery-backed systems and avoids false triggering in high-impedance sensing nodes |
| Automated Assembly Support | DO-214AB footprint and matte tin plating ensure reliable reflow soldering per J-STD-002 and compatibility with standard SMT pick-and-place equipment |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: 48 V DC input rail in programmable logic controllers exposed to load dump and inductive switching noise. IC Role / Device Role: Unidirectional TVS placed between input rail and chassis ground to clamp positive surges. Use Value: 165 V clamping voltage prevents damage to upstream DC-DC controllers rated for 200 V absolute max, extending system uptime in factory automation. |
Use Scenario: RS-485 data line in outdoor base station equipment subjected to lightning-induced common-mode transients. IC Role / Device Role: Line-to-ground TVS on each differential pair, leveraging fast response to suppress sub-nanosecond ESD events. Use Value: Sub-1 ps response and 1500 W rating meet ITU-T K.21 heavy-duty protection requirements for public network infrastructure. |
| Automotive Body Control Module | Consumer AC-DC Adapter Input Stage |
Use Scenario: 12 V battery feed to microcontroller power domain in door module, subject to ISO 7637-2 Pulse 1 (inductive load dump) and Pulse 2b (alternator load dump). IC Role / Device Role: Unidirectional TVS on VBAT input, oriented to clamp positive spikes only. Use Value: Compliance with ISO 7637-2 Pulse 1/2a/2b/3a/3b ensures qualification for OEM Tier-1 body electronics without additional filtering stages. |
Use Scenario: Primary-side input of universal-input (90–264 VAC) offline SMPS in smart home hubs. IC Role / Device Role: MOV replacement for improved clamping precision and lower leakage on bridge rectifier output. Use Value: 102 V VWM allows direct placement after rectification while maintaining >1000 V surge margin, reducing BOM count vs. multi-stage protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ120A | 600 W PPK rating, same VWM (102 V), higher VC (193 V @ 3.1 A), DO-214AA (SMB) package | Limited to lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 (4 kV) without parallel staging | Select when board space is constrained and surge threat level is limited to ESD or low-energy switching noise. |
| 1.5KE120A | Through-hole TO-204AE (DO-41), 1500 W PPK, identical VBR/VC specs, but no automated placement support | Requires manual or wave soldering; incompatible with high-volume SMT production | Select only for legacy through-hole designs or prototyping where rework flexibility outweighs assembly efficiency. |
Compared with SMBJ120A and 1.5KE120A, the 1.5SMC120A delivers full 1500 W surge handling in an SMT-optimized DO-214AB package with superior thermal resistance (15 °C/W RθJC), making it the preferred choice for automated manufacturing of industrial and automotive power interfaces requiring repeatable, high-reliability clamping.
Availability
1.5SMC120A is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface hardening, and automotive body control module designs requiring stable component supply and long-term lifecycle assurance.
Supply support for 1.5SMC120A 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, including TVS diodes, rectifiers, and MOSFETs, with global distribution and AEC-Q101 qualified product lines.
The 1.5SMC120A belongs to TSC's SMC-series TVS platform, engineered specifically for high-power, surface-mount surge protection in automotive, industrial, and telecom infrastructure where reliability under repetitive transient stress is critical.
FAQ
What is the clamping voltage of the 1.5SMC120A under a standard 10/1000 µs surge waveform?
The 1.5SMC120A has a maximum clamping voltage (VC) of 165 V when subjected to a 10/1000 µs surge current pulse of 9.5 A. This value is measured per IEC 61000-4-5 and ensures protected circuits remain within safe operating limits during standardized surge events. The 1.5SMC120A achieves this clamping performance while maintaining low leakage and fast response time.
Is the 1.5SMC120A suitable for bidirectional transient suppression?
No - the 1.5SMC120A is a unidirectional TVS diode, intended only for suppressing positive-going transients on a line referenced to ground. For bidirectional protection, the 1.5SMC120CA variant must be used. The 1.5SMC120A's cathode band marking and asymmetric IV characteristics confirm its single-polarity operation, and using it in reverse-biased configurations risks premature breakdown or failure.
Does the 1.5SMC120A meet automotive surge immunity standards?
Yes - the 1.5SMC120A meets ISO 7637-2 requirements for Pulse 1 (inductive load dump), Pulse 2a (sudden load disconnection), Pulse 2b (alternator load dump), and Pulses 3a/3b (switching noise), making it suitable for 12 V and 24 V automotive subsystems. Its 1500 W rating and 165 V clamping voltage align with OEM-level surge test profiles for body electronics and infotainment power inputs.
What is the thermal resistance from junction to case for the 1.5SMC120A?
The junction-to-case thermal resistance (RθJC) of the 1.5SMC120A is 15 °C/W, measured under standard mounting conditions on a 1-inch² copper pad. This low thermal resistance enables efficient heat extraction during repetitive surge events and supports reliable operation at elevated ambient temperatures up to +125 °C when properly laid out on PCBs with adequate copper area.
How does the 1.5SMC120A compare to the 1.5SMC120 (non-A) variant?
The 1.5SMC120A offers tighter breakdown voltage tolerance (114–126 V) versus the 1.5SMC120 (108–132 V), resulting in more predictable clamping onset and reduced risk of premature conduction in margin-critical applications. Both share identical package (DO-214AB), power rating (1500 W), and thermal specs, but the "A" suffix denotes enhanced VBR uniformity required for high-reliability industrial and automotive deployments.
1.5SMC120A 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):
- 102V
- Voltage - Breakdown (Min):
- 114V
- Voltage - Clamping (Max) @ Ipp:
- 165V
- Current - Peak Pulse (10/1000µs):
- 9.5A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- Telecom
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC120A FAQ
1.How can I place an order for 1.5SMC120A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC120A 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 1.5SMC120A reliable?
The price and inventory of 1.5SMC120A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC120A is usually 5 days.
3.What payment methods are accepted for 1.5SMC120A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC120A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC120A?
1.5SMC120A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC120A 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 1.5SMC120A?
For technical support, including 1.5SMC120A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC120A requirements.
6.How does Aetrix verify that 1.5SMC120A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC120A 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 1.5SMC120A meets industry standards.
7.What is the process for return or replacement of 1.5SMC120A?
All 1.5SMC120A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC120A, 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 1.5SMC120A part is unused and in its original packaging.
Return procedure for 1.5SMC120A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC120A Tags
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