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Taiwan Semiconductor Corporation 1.5SMC18AH
- Part No.:
- 1.5SMC18AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC18AH.pdf
- Description:
- TVS DIODE 15.3VWM 25.5VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,816
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Product details
Overview
1.5SMC18AH 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 maximum clamping voltage (VC) at 60A peak impulse current. It protects automotive and industrial power rails against ESD, load dump, and lightning-induced transients.
For engineers reviewing the 1.5SMC18AH datasheet, 1.5SMC18AH pinout, 1.5SMC18AH application, or 1.5SMC18AH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, AEC-Q101 qualification status, moisture sensitivity level (MSL 1), and unidirectional polarity marking for correct PCB orientation.
Technical Context
This TVS diode uses a glass-passivated silicon junction to achieve fast response time (<1.0 ps) and low leakage (<1 µA at 15.3 V). Its thermal design supports continuous operation up to +150°C junction temperature with RθJA = 50°C/W and RθJC = 15°C/W.
The device complies with ANSI/IEEE C62.35 for surge protection and meets ISO 7637-2 test requirements for automotive electronics. It is rated for 200A non-repetitive forward surge current (IFSM) and features a working stand-off voltage of 15.3 V with bidirectional variants available via CH/CAH suffixes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR (min/max) | 17.1 V / 18.9 V - Ensures reliable conduction onset above normal operating voltage while avoiding false triggering |
| VWM | 15.3 V - Maximum continuous reverse voltage the device blocks without significant leakage |
| VC @ IPPM | 25.5 V at 60 A - Clamped voltage during 10/1000 µs surge, defining protected circuit's maximum overvoltage stress |
| PPK | 1500 W - Peak pulse power handling capability per single 10/1000 µs waveform per Fig.5 |
| IR @ VWM | <1 µA - Ultra-low leakage preserves signal integrity and minimizes standby power loss |
| TJ max | +150 °C - Enables use in under-hood automotive environments and high-temperature industrial enclosures |
| Package | DO-214AB (SMC) - Standardized surface-mount outline compatible with automated placement and reflow soldering |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band on unidirectional devices. Weight ≈ 0.210 g. Meets UL 94V-0 flammability rating and JESD 201 Class 2 whisker resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side for unidirectional clamping | Connected to protected line (e.g., 12 V rail); conducts when cathode-to-anode voltage exceeds VBR |
| Cathode | Clamp reference / ground return | Connected to system ground or low-impedance return path; defines polarity and clamping direction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress test plan |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal and humidity stress |
| ISO 7637-2 compliance | Withstands Pulse 1 (inductive load disconnect), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) waveforms |
| MSL Level 1 | No floor life limitation; safe for standard SMT reflow without baking prior to assembly |
| RoHS & halogen-free | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained applications |
Applications
| Automotive Power Distribution | Industrial PLC I/O Protection |
|---|---|
Use Scenario: 12 V battery rail in engine control units exposed to load dump and alternator transients. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between battery input and downstream DC-DC converter input. Use Value: Limits transient voltage to ≤25.5 V, preventing damage to 36 V-rated input stages while maintaining >15.3 V functional margin during normal operation. |
Use Scenario: Digital input module in programmable logic controller subjected to field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Primary protection element on each 24 V digital input channel before optocoupler or MCU GPIO. Use Value: Sub-1 ps response ensures clamping occurs before sensitive interface ICs experience overstress; <1 µA leakage avoids false triggering in high-impedance sensing circuits. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive |
Use Scenario: AC-DC adapter output stage feeding base station radio modules requiring clean 48 V supply. IC Role / Device Role / Timing Role: Secondary-side TVS across output terminals to suppress surges induced by nearby lightning strikes or grid switching. Use Value: 1500 W peak power rating handles multi-kV transients without degradation; DO-214AB footprint enables compact layout near connector entry points. |
Use Scenario: Brushless DC motor driver board in smart home appliance experiencing back-EMF spikes during commutation. IC Role / Device Role / Timing Role: Clamp across H-bridge high-side FET source and low-side FET drain to absorb inductive energy. Use Value: 25.5 V clamping voltage ensures MOSFETs remain within safe operating area (SOA); unidirectional configuration prevents interference with PWM control signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ18A | Lower peak power (600 W), same VBR range (17.1–18.9 V), SMB package (smaller footprint, higher RθJA) | Not suitable for ISO 7637-2 Pulse 1 or sustained surge events requiring >1 kW dissipation | Select only for space-constrained consumer designs with lower-energy transients |
| 1.5KE18A | Through-hole TO-204AA (DO-41) package, identical electrical specs but no AEC-Q101 qualification or MSL 1 rating | Lacks automotive process validation and requires manual insertion or wave soldering; unsuitable for high-reliability automotive production | Use only in legacy industrial equipment where rework tolerance and leaded assembly are acceptable |
Compared with SMBJ18A and 1.5KE18A, the 1.5SMC18AH delivers higher surge robustness in a surface-mount package with automotive-grade reliability certification and zero moisture sensitivity-making it optimal for new automotive and industrial designs requiring both performance and manufacturability.
Availability
1.5SMC18AH is available at Aetrix Electronics and suitable for automotive power distribution, industrial PLC I/O protection, and telecom power supply input applications requiring stable component supply, AEC-Q101 compliance, and high-energy transient immunity.
Supply support for 1.5SMC18AH 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 power management, protection, and signal conditioning devices.
The 1.5SMC series was developed specifically for high-reliability automotive and industrial surge protection, emphasizing AEC-Q101 qualification, ISO 7637-2 compliance, and robust surface-mount packaging for automated manufacturing.
FAQ
What is the clamping voltage of the 1.5SMC18AH under a 10/1000 µs surge?
The 1.5SMC18AH has a maximum clamping voltage (VC) of 25.5 V when subjected to a 60 A peak impulse current with a 10/1000 µs waveform. This value is measured per Fig.5 in the official datasheet and defines the upper voltage limit imposed on protected circuitry during standardized surge events.
Is the 1.5SMC18AH suitable for bidirectional transient suppression?
No-the 1.5SMC18AH is a unidirectional TVS diode, intended for DC line protection with defined anode/cathode polarity. For bidirectional applications, Taiwan Semiconductor offers the 1.5SMC18CAH variant, which provides symmetrical clamping in both directions and uses the CAH suffix per ordering documentation.
Does the 1.5SMC18AH meet AEC-Q101 requirements for automotive use?
Yes-the 1.5SMC18AH is explicitly qualified to AEC-Q101 Rev D, covering stress tests including high-temperature reverse bias (HTRB), temperature cycling, and ESD (HBM ≥8 kV, CDM ≥1 kV). This qualification is documented in Version B2207 of the official datasheet.
What is the maximum steady-state power dissipation for the 1.5SMC18AH?
The 1.5SMC18AH has a steady-state power dissipation (PD) rating of 6.5 W at TA = 25°C. This value applies only to continuous DC or low-frequency conditions-not transient events-and must be derated linearly above 25°C ambient using the specified thermal resistance values (RθJA = 50°C/W).
How does the 1.5SMC18AH compare to the 1.5SMC18H variant?
The 1.5SMC18AH has tighter breakdown voltage tolerance (17.1–18.9 V) versus the 1.5SMC18H (16.2–19.8 V), resulting in more consistent clamping behavior across production lots. Both share identical package, power rating, and thermal specs-but the "A" suffix denotes enhanced VBR uniformity required for precision protection schemes.
1.5SMC18AH 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
1.5SMC18AH FAQ
1.How can I place an order for 1.5SMC18AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC18AH 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 1.5SMC18AH reliable?
The price and inventory of 1.5SMC18AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC18AH is usually 5 days.
3.What payment methods are accepted for 1.5SMC18AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC18AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC18AH?
1.5SMC18AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC18AH 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 1.5SMC18AH?
For technical support, including 1.5SMC18AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC18AH requirements.
6.How does Aetrix verify that 1.5SMC18AH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC18AH 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 1.5SMC18AH meets industry standards.
7.What is the process for return or replacement of 1.5SMC18AH?
All 1.5SMC18AH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC18AH, 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 1.5SMC18AH part is unused and in its original packaging.
Return procedure for 1.5SMC18AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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