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Taiwan Semiconductor Corporation 1.5SMC20AH
- Part No.:
- 1.5SMC20AH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC20AH.pdf
- Description:
- TVS DIODE 17.1VWM 27.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,403
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Product details
Overview
1.5SMC20AH 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 20V working stand-off voltage (VWM), 19.0–21.0V breakdown voltage (VBR) at 1mA test current, 27.7V maximum clamping voltage (VC) at 56A peak pulse current, and 1500W peak pulse power rating per 10/1000μs waveform. It is AEC-Q101 qualified and used in automotive body electronics to protect CAN transceivers from ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the 1.5SMC20AH datasheet, 1.5SMC20AH pinout, 1.5SMC20AH application, or 1.5SMC20AH equivalent, key selection criteria include clamping voltage margin relative to protected IC VCC, leakage current below 1μA at 17.1V, thermal resistance (RθJA = 50°C/W), and DO-214AB package compatibility with automated SMT placement and IPC Class 2 whisker reliability.
Technical Context
The 1.5SMC20AH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its specified breakdown range (19.0–21.0V). Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1μA at 17.1V), while fast response time (<1.0ps) enables effective suppression of ESD and lightning-induced transients.
It complies with ISO 7637-2 for automotive load-dump and switching surge immunity, supports 200A non-repetitive forward surge (IFSM), and maintains operation across –55°C to +150°C junction temperature. Its DO-214AB (SMC) package delivers 15°C/W junction-to-case thermal resistance for reliable power dissipation under repetitive surge conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 17.1 V - Maximum continuous reverse operating voltage before clamping begins; sets safe margin below protected circuit's max rail voltage. |
| VBR @ IT=1mA | 19.0–21.0 V - Measured breakdown range defining turn-on threshold; tight 5% tolerance ensures predictable clamping onset. |
| VC @ IPPM=56A | 27.7 V - Clamped voltage during 10/1000μs surge; determines maximum stress on downstream components. |
| PPK | 1500 W - Peak pulse power handling per standard waveform; defines single-event energy absorption capability. |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage; ensures minimal standby power loss and signal integrity. |
| RθJA | 50 °C/W - Junction-to-ambient thermal resistance; informs PCB copper area requirements for sustained surge duty cycles. |
| TJ max | +150 °C - Maximum allowable junction temperature; enables use in under-hood automotive environments. |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Matte tin-plated leads meet J-STD-002 solderability; moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., CAN_H or 12V rail); conducts surge current toward ground when clamped. |
| Cathode | Ground reference | Connected to system ground or low-impedance return path; polarity-marked band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive applications including engine control, body modules, and infotainment systems. |
| Glass passivated junction | Ensures stable VBR over lifetime and improved humidity resistance vs. epoxy-passivated alternatives. |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line capacitance discharge). |
| Fast response time | <1.0 ps - Limits voltage overshoot during nanosecond-scale ESD events (IEC 61000-4-2). |
| Halogen-free & RoHS | Complies with IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for green manufacturing. |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Digital Input Protection |
|---|---|
Use Scenario: Protects 12V supply rails and LIN/CAN signal lines in door modules and lighting controllers against battery load dump and alternator ripple. IC Role / Device Role / Timing Role: Unidirectional TVS placed between power rail and chassis ground to clamp transients before they reach MCU I/O or transceiver inputs. Use Value: Clamps 1500W surges to ≤27.7V, preserving 3.3V/5V logic-level interface ICs rated for 30V absolute max. |
Use Scenario: Shields 24V digital input channels in programmable logic controllers from field-wiring induced surges and relay coil flyback. IC Role / Device Role / Timing Role: Front-end protection device on optocoupler input side, absorbing energy before isolation barrier. Use Value: Withstands 200A IFSM and maintains <1μA leakage at 17.1V, ensuring clean signal detection without false triggering. |
| Telecom Power Supply Input | Consumer Appliance Motor Drive Board |
Use Scenario: Guards AC/DC adapter output stages and PoE-powered Ethernet PHYs against lightning-induced common-mode surges. IC Role / Device Role / Timing Role: Secondary-side TVS on regulated 5V/12V outputs, coordinated with primary-side MOVs and Y-capacitors. Use Value: 27.7V VC limits stress on LDOs and USB PHYs; DO-214AB footprint allows high-density layout near connectors. |
Use Scenario: Protects microcontroller GPIOs and gate drivers on washing machine motor control boards exposed to brush-commutator noise. IC Role / Device Role / Timing Role: Localized clamping on H-bridge enable lines and current-sense amplifier inputs. Use Value: 50°C/W RθJA enables thermal management via small copper pours; AEC-Q101 grade supports extended product lifecycle. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ20A | Same DO-214AA package; lower PPK (600W), higher VC (32.4V at 32.5A), looser VBR tolerance (19.0–23.3V). | Not suitable for 1500W ISO 7637-2 Pulse 1; limited to lower-energy ESD and data-line protection. | Select only if board space restricts DO-214AB and surge energy is ≤600W. |
| 1.5KE20A | Through-hole DO-15 package; identical electrical specs but incompatible mounting; 1000W PPK rating (not 1500W). | Requires PCB redesign; unsuitable for automated SMT production or high-vibration environments. | Choose only for legacy through-hole designs where rework is acceptable and surge energy is confirmed ≤1000W. |
Compared with SMBJ20A and 1.5KE20A, the 1.5SMC20AH delivers 2.5× higher peak power handling in a surface-mount package with tighter VBR tolerance and lower clamping voltage-critical for protecting modern low-voltage automotive and industrial ICs without increasing board area.
Availability
1.5SMC20AH is available at Aetrix Electronics and suitable for automotive electronics, industrial PLCs, and telecom power supplies requiring stable component supply, AEC-Q101 compliance, and high-reliability surge immunity.
Supply support for 1.5SMC20AH 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 automotive-grade components.
The 1.5SMC20AH belongs to TSC's AEC-Q101-qualified SMC-series TVS family, engineered specifically for robust, high-power transient suppression in harsh automotive and industrial environments where reliability under repeated surge stress is mandatory.
FAQ
What is the polarity configuration of the 1.5SMC20AH?
The 1.5SMC20AH is a unidirectional TVS diode with anode and cathode terminals clearly marked by a cathode band on the DO-214AB package body. It conducts only during reverse-biased overvoltage events-forward conduction is not intended for protection. This configuration matches standard DC power rail protection layouts where the cathode connects to ground and the anode to the protected line.
Does the 1.5SMC20AH meet ISO 7637-2 for automotive applications?
Yes, the 1.5SMC20AH is explicitly tested and compliant with ISO 7637-2 for Pulses 1, 2a, 2b, 3a, and 3b, as stated in Taiwan Semiconductor's official datasheet (Version B2207). Its 1500W peak pulse power rating and 27.7V clamping voltage at 56A ensure it can suppress load-dump and switching transients typical in 12V vehicle electrical systems without failure.
What is the maximum leakage current of the 1.5SMC20AH at its working voltage?
The 1.5SMC20AH exhibits a maximum blocking leakage current (IR) of less than 1 μA when biased at its 17.1V working stand-off voltage (VWM), measured at TA = 25°C. This ultra-low leakage preserves signal integrity in high-impedance circuits and minimizes standby power loss in always-on automotive modules.
Can the 1.5SMC20AH be used in bidirectional configurations?
No-the 1.5SMC20AH is strictly unidirectional. For bidirectional surge protection, Taiwan Semiconductor specifies part numbers with "CH" or "CAH" suffixes (e.g., 1.5SMC20CH). Using the 1.5SMC20AH in reverse-biased AC or differential signal paths will result in unintended forward conduction and potential failure.
What is the thermal resistance profile of the 1.5SMC20AH?
The 1.5SMC20AH has a junction-to-ambient thermal resistance (RθJA) of 50°C/W and a junction-to-case resistance (RθJC) of 15°C/W, both measured under standard JEDEC conditions. These values guide PCB layout decisions-such as minimum copper area and thermal vias-to maintain junction temperature below +150°C during repetitive surge events.
1.5SMC20AH 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):
- 17.1V
- Voltage - Breakdown (Min):
- 19V
- Voltage - Clamping (Max) @ Ipp:
- 27.7V
- Current - Peak Pulse (10/1000µs):
- 56A
- 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)
1.5SMC20AH FAQ
1.How can I place an order for 1.5SMC20AH through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC20AH 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 1.5SMC20AH reliable?
The price and inventory of 1.5SMC20AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC20AH is usually 5 days.
3.What payment methods are accepted for 1.5SMC20AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC20AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC20AH?
1.5SMC20AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC20AH 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 1.5SMC20AH?
For technical support, including 1.5SMC20AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC20AH requirements.
6.How does Aetrix verify that 1.5SMC20AH is sourced from the original manufacturer or authorized distributors?
All 1.5SMC20AH 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 1.5SMC20AH meets industry standards.
7.What is the process for return or replacement of 1.5SMC20AH?
All 1.5SMC20AH units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC20AH, 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 1.5SMC20AH part is unused and in its original packaging.
Return procedure for 1.5SMC20AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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