My Inquiry
My Account
Taiwan Semiconductor Corporation 1.5SMC18A
- Part No.:
- 1.5SMC18A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18A.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,257
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1.5SMC18A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 17.1–18.9V breakdown voltage (VBR), and 25.5V clamping voltage (VC) at 60A peak impulse current. It protects DC power rails and signal lines in telecom interfaces and industrial I/O against ESD, lightning surges, and load-switching transients.
For engineers reviewing the 1.5SMC18A datasheet, 1.5SMC18A pinout, 1.5SMC18A application, or 1.5SMC18A equivalent, this page delivers verified electrical specs, thermal resistance values, clamping performance under 10/1000μs surge, polarity marking, and RoHS/halogen-free compliance per IEC 61249-2-21 - all critical for board-level surge immunity validation.
Technical Context
The 1.5SMC18A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1ps response to transients and <1μA leakage above 15.3V working stand-off voltage. Its 150°C max junction temperature and 50°C/W junction-to-ambient thermal resistance support reliable operation in high-temperature industrial environments.
Designed for automated SMT placement, it meets ISO 7637-2 Pulse 1/2a/2b/3a/3b for automotive electronics and complies with JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1 - confirming suitability for reflow-soldered, high-reliability PCB assemblies without baking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR @ IT=1mA | 17.1–18.9V - defines minimum voltage at which avalanche conduction begins; ensures robust margin above 15.3V system operating rail |
| VWM | 15.3V - maximum continuous reverse working voltage; sets safe DC bias limit before leakage rises |
| VC @ IPPM=60A | 25.5V - clamped voltage during 10/1000μs surge; determines protected circuit's peak overvoltage exposure |
| PPK | 1500W - peak pulse power rating per 1ms waveform; quantifies single-event surge energy absorption capability |
| RθJA | 50°C/W - junction-to-ambient thermal resistance; informs heatsinking requirements for repeated surge duty cycles |
| IR @ VWM | <1μA - blocking leakage at rated stand-off voltage; minimizes standby power loss in battery-powered systems |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with cathode band marking; supports 3,000 pcs/reel tape-and-reel handling |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, UL 94V-0 flammability rating, and cathode band marking on one end. Polarity is unidirectional; cathode side must be connected toward the protected line's positive rail.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference terminal | Connected to ground or low-potential node; completes conduction path during reverse-biased surge events |
| Cathode | High-side surge input terminal | Connected to protected line (e.g., 12V rail); blocks normal operation but avalanches when VIN exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter drift |
| Fast response time <1.0ps | Clamps transients before sensitive ICs experience overstress - critical for protecting USB, RS-485, and Ethernet PHYs |
| Meets ISO 7637-2 Pulse 1/2a/2b/3a/3b | Validated for automotive-level conducted transient immunity; suitable for body control modules and infotainment power inputs |
| RoHS & halogen-free | Complies with EU RoHS Directive 2011/65/EU and IEC 61249-2-21; enables export to regulated markets without material declaration burden |
| J-STD-020 MSL Level 1 | Zero floor life limitation - can be stored indefinitely at ≤30°C/60% RH and placed directly into reflow without baking |
Applications
| Industrial PLC I/O Protection | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: 24V DC input channels in programmable logic controllers exposed to relay coil flyback and field wiring surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input terminal and ground to clamp induced transients before they reach input conditioning circuitry. Use Value: Limits voltage to ≤25.5V during 10/1000μs surges up to 60A, preventing damage to optocouplers and microcontroller GPIOs rated for 30V absolute max. | Use Scenario: Power supply input of BCM units subjected to load-dump and jump-start pulses per ISO 7637-2. IC Role / Device Role / Timing Role: Primary front-end surge suppressor on main 12V rail, coordinated with upstream fuse and downstream LC filter. Use Value: Absorbs 1500W peak pulse energy while maintaining clamping below 25.5V - within safe operating area of 36V-rated DC-DC converters and CAN transceivers. |
| Telecom DSL Line Interface | Consumer Appliance Motor Drive Board |
Use Scenario: Protection of ADSL/VDSL line drivers and transformers against lightning-induced common-mode surges on twisted-pair copper lines. IC Role / Device Role / Timing Role: Paired unidirectional 1.5SMC18A devices (one per line) referenced to chassis ground, forming symmetric clamping network. Use Value: Sub-1ps response captures fast-rising surges before transformer saturation; 1μA leakage avoids signal integrity degradation on 1–30MHz DSL bands. | Use Scenario: DC bus protection in BLDC motor driver boards where MOSFET switching causes repetitive voltage spikes on 18–24V supply rails. IC Role / Device Role / Timing Role: Parallel-mounted TVS across bulk capacitor to absorb commutation spikes and prevent overvoltage shutdown of gate drivers. Use Value: 1500W rating handles repetitive 100–500ns spikes; 25.5V clamping keeps rail voltage within 80% of 32V-rated gate driver VDD absolute maximum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A (ON Semiconductor) | Same DO-214AA (SMB) package; 18V VBR, 28.8V VC @ 52.1A; 600W PPK | Lower power rating limits use to lower-energy transients; smaller footprint reduces thermal mass | Select when space-constrained layouts require SMB vs SMC and surge energy is ≤600W |
| SMCJ18A (Littelfuse) | Identical DO-214AB (SMC) package; 18V VBR, 27.7V VC @ 54.2A; 1500W PPK | Same clamping performance and thermal specs; minor VC variance (25.5V vs 27.7V) affects protected device margin | Drop-in alternative if sourcing flexibility is needed; verify layout compatibility with cathode band orientation |
Compared with SMBJ18A and SMCJ18A, the 1.5SMC18A offers the lowest clamping voltage (25.5V) among SMC-packaged 18V TVS diodes, delivering tighter overvoltage protection for 24V systems while maintaining full 1500W surge capacity and MSL Level 1 handling.
Availability
1.5SMC18A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, automotive BCM power inputs, telecom DSL line interfaces, and consumer appliance motor drive boards requiring stable component supply and long-term lifecycle continuity.
Supply support for 1.5SMC18A 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 since 1979.
The 1.5SMCxxA series targets high-reliability, high-power transient suppression in automotive, industrial, and telecom infrastructure - engineered for ISO 7637-2 compliance, automated SMT assembly, and extended thermal stability up to 150°C junction temperature.
FAQ
What is the breakdown voltage range of the 1.5SMC18A?
The 1.5SMC18A has a guaranteed breakdown voltage (VBR) range of 17.1V to 18.9V at 1mA test current, measured per ANSI/IEEE C62.35. This tight tolerance ensures consistent clamping behavior across production lots and supports precise overvoltage margining in 18–24V systems where the 1.5SMC18A is commonly deployed.
Does the 1.5SMC18A support bidirectional transient suppression?
No, the 1.5SMC18A is a unidirectional TVS diode. For bidirectional protection, Taiwan Semiconductor specifies the 1.5SMC18CA variant (with "CA" suffix), which provides symmetrical clamping in both polarities. The 1.5SMC18A must be oriented with its cathode band toward the positive rail to function correctly in DC applications.
What is the maximum clamping voltage of the 1.5SMC18A under surge conditions?
The 1.5SMC18A clamps to a maximum of 25.5V when subjected to a 10/1000μs surge waveform with 60A peak current (IPPM). This value is measured per standard test conditions and defines the highest voltage that will appear across protected circuitry during worst-case transient events - critical for ensuring downstream components remain within their absolute maximum ratings.
Is the 1.5SMC18A compatible with lead-free reflow soldering processes?
Yes, the 1.5SMC18A features matte tin-plated leads compliant with J-STD-002 solderability standards and is qualified for standard Pb-free reflow profiles (peak temperature ≤260°C). Its MSL Level 1 rating per J-STD-020 means it can be placed directly from dry pack without pre-baking, simplifying manufacturing flow for high-volume SMT lines.
How does the 1.5SMC18A compare to the 1.5SMC18 in terms of leakage and clamping?
The 1.5SMC18A offers improved parameters over the non-A version: lower leakage (<1μA vs ≤5μA at VWM), tighter VBR tolerance (±5% vs ±10%), and reduced clamping voltage (25.5V vs 26.5V at same IPPM). These enhancements make the 1.5SMC18A preferable for low-power, precision-sensitive applications where minimal standby current and tighter overvoltage control are required.
1.5SMC18A 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):
- 15.3V
- Voltage - Breakdown (Min):
- 17.1V
- Voltage - Clamping (Max) @ Ipp:
- 25.5V
- Current - Peak Pulse (10/1000µs):
- 60A
- 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)
1.5SMC18A FAQ
1.How can I place an order for 1.5SMC18A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18A 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 1.5SMC18A reliable?
The price and inventory of 1.5SMC18A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18A is usually 5 days.
3.What payment methods are accepted for 1.5SMC18A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18A?
1.5SMC18A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18A 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 1.5SMC18A?
For technical support, including 1.5SMC18A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18A requirements.
6.How does Aetrix verify that 1.5SMC18A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18A 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 1.5SMC18A meets industry standards.
7.What is the process for return or replacement of 1.5SMC18A?
All 1.5SMC18A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18A, 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 1.5SMC18A part is unused and in its original packaging.
Return procedure for 1.5SMC18A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1.5SMC18A Tags
-
ESD9B5.0ST5G
onsemi
-
DESD3V3E1BL-7B
Diodes Incorporated
-
ESD5Z3.3T1G
onsemi
-
D5V0H1B2LP-7B
Diodes Incorporated
-
D5V0P1B2LP-7B
Diodes Incorporated
-
DESD5V0U1BA-7
Diodes Incorporated
-
ESD5Z5.0T1G
onsemi
-
DESD5V0U1BB-7
Diodes Incorporated
-
D12V0L1B2LP-7B
Diodes Incorporated
-
PESD2V0Y1BSFYL
Nexperia USA Inc.
-
DF2S5M4CT,L3F
Toshiba Semiconductor and Storage
-
D5V0L1B2WS-7
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
