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Taiwan Semiconductor Corporation 1.5SMC22A
- Part No.:
- 1.5SMC22A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC22A.pdf
- Description:
- TVS DIODE 18.8VWM 30.6VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:4,338
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Product details
Overview
1.5SMC22A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode designed for primary-level overvoltage protection in DC power rails and signal lines. It features a 20.9–23.1 V breakdown voltage (VBR), 18.8 V working stand-off voltage (VWM), 30.6 V maximum clamping voltage (VC) at 51 A peak pulse current, and 1500 W peak pulse power rating per 10/1000 µs waveform - deployed in telecom front-ends, industrial I/O modules, and automotive body control units.
For engineers reviewing the 1.5SMC22A datasheet, 1.5SMC22A pinout, 1.5SMC22A application, or 1.5SMC22A equivalent, this page delivers verified electrical parameters, DO-214AB package layout guidance, clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b, thermal resistance values (RθJA = 50 °C/W), and real-world ESD/transient immunity trade-offs for board-level surge design.
Technical Context
The 1.5SMC22A operates as a unidirectional avalanche diode with glass-passivated junction, enabling sub-1 ps response to fast transients while maintaining <1 µA leakage at 18.8 V. Its DO-214AB (SMC) package supports automated placement and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards.
Thermal performance is defined by RθJC = 15 °C/W and RθJA = 50 °C/W, allowing sustained operation up to +150 °C junction temperature. It complies with ISO 7637-2 for automotive load-dump and inductive-switching immunity but is not rated for bidirectional use without CA suffix.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 20.9 V / 23.1 V - defines minimum and maximum voltage at which avalanche conduction begins under 1 mA test current; sets lower bound for reliable clamping onset. |
| VWM | 18.8 V - maximum continuous DC or RMS voltage the device blocks without significant leakage; must exceed system operating voltage by ≥10%. |
| VC @ IPPM | 30.6 V at 51 A - clamped voltage during 10/1000 µs surge; determines worst-case stress on downstream ICs during transient events. |
| PPK | 1500 W - peak pulse power handling capability per single non-repetitive 10/1000 µs waveform; derates linearly above 25 °C ambient. |
| IR @ VWM | <1 µA - reverse leakage at rated stand-off voltage; ensures minimal quiescent power loss and no false triggering in low-power circuits. |
| TJ max | +150 °C - maximum allowable junction temperature; constrains PCB copper area and airflow requirements for thermal management. |
| RθJA | 50 °C/W - junction-to-ambient thermal resistance; used to calculate temperature rise under steady-state power dissipation (PD = 6.5 W). |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, unidirectional configuration with cathode band marking. Case meets UL 94V-0; matte tin-plated leads compliant with J-STD-002 solderability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Input/Line side | Connected to protected line (e.g., 24 V rail or RS-485 A/B); conducts during reverse-biased surge event. |
| Cathode | Ground reference side | Connected to system ground or low-impedance return path; establishes clamping reference and polarity-sensitive conduction direction. |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics and long-term reliability under repeated surge stress without parameter drift. |
| Sub-1 ps response time | Clamps transients before sensitive downstream logic or analog circuitry can be damaged - critical for protecting high-speed interfaces. |
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (capacitive coupling) - required for automotive ECUs. |
| Moisture sensitivity level 1 | Allows unlimited floor life before reflow; eliminates baking requirement and simplifies SMT manufacturing flow. |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU - supports environmental compliance for global OEM shipments. |
Applications
| Industrial PLC Analog Input Module | Automotive Body Control Unit (BCU) |
|---|---|
Use Scenario: Protects 4–20 mA current-loop inputs from induced surges due to nearby motor switching or relay contact bounce. IC Role / Device Role: Primary overvoltage clamp placed between input terminal and ADC front-end, shunting energy to chassis ground. Use Value: Limits voltage seen by precision op-amp and 24-bit sigma-delta ADC to ≤30.6 V during 1 kV/500 A surge, preserving measurement integrity. |
Use Scenario: Shields LIN bus transceiver and microcontroller I/O pins from battery line transients during jump-start or alternator load dump. IC Role / Device Role: Unidirectional TVS on VBAT-fed 5 V LDO input, absorbing ISO 7637-2 Pulse 2b (50 V/100 ms) and Pulse 5a (75 V/400 ms). Use Value: Prevents latch-up or permanent damage to 5 V regulator and MCU by clamping to 30.6 V before internal overvoltage protection triggers. |
| Telecom Remote Radio Head (RRH) Power Interface | Smart Energy Meter DC Power Rail |
Use Scenario: Guards 48 V DC input stage of outdoor RRH against lightning-induced surges coupled via long feeder cables. IC Role / Device Role: First-stage TVS in cascade with GDT and π-filter; handles bulk energy before secondary suppression stages. Use Value: Withstands 1500 W peak pulse (10/1000 µs), enabling coordination with upstream 5 kA GDT for full IEC 61000-4-5 Level 4 compliance. |
Use Scenario: Secures 3.3 V microcontroller supply derived from isolated DC-DC converter against ESD and capacitor discharge events. IC Role / Device Role: Secondary-side TVS on regulated output rail, placed adjacent to MCU VDD pin with minimal trace inductance. Use Value: Delivers <1 µA leakage at 18.8 V stand-off, avoiding unnecessary loading of low-quiescent-current DC-DC converter in battery-backed meter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ22A (Bourns) | Same DO-214AA package; 20.9–23.1 V VBR, but lower PPK = 600 W and higher VC = 35.5 V at 17 A. | Not suitable for 1500 W surge environments; limited to lower-energy IEC 61000-4-2/4-4 events. | Select only when system-level testing confirms 600 W clamping margin is sufficient and PCB space allows smaller SMB footprint. |
| 1.5KE22A (ON Semiconductor) | Through-hole DO-15 package; identical VBR/VC specs but slower response (>1 ns) and no ISO 7637-2 validation. | Requires manual assembly or wave soldering; unsuitable for automated SMT lines or automotive vibration-prone mounting. | Use only for legacy through-hole designs where rework to SMC is impractical and ISO compliance is not mandated. |
Compared with SMBJ22A and 1.5KE22A, the 1.5SMC22A provides 2.5× higher peak power rating in an SMT-optimized DO-214AB package with documented ISO 7637-2 compliance - making it the preferred choice for new automotive, industrial, and telecom designs requiring robust, automated, and standards-aligned transient protection.
Availability
1.5SMC22A is available at Aetrix Electronics and suitable for industrial PLC analog input modules, automotive body control units, telecom remote radio heads, and smart energy meter power rails requiring stable component supply across multi-year production cycles.
Supply support for 1.5SMC22A 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, TVS diodes, rectifiers, and MOSFETs - headquartered in Hsinchu Science Park, Taiwan.
The 1.5SMCxx(A) series was engineered specifically for high-reliability, surface-mount transient suppression in automotive, industrial, and telecom infrastructure - emphasizing ISO 7637-2 compliance, moisture-insensitive packaging, and tight parametric tolerances.
FAQ
What is the maximum clamping voltage of the 1.5SMC22A under a 10/1000 µs surge?
The 1.5SMC22A has a maximum clamping voltage (VC) of 30.6 V when subjected to its rated peak pulse current of 51 A under the standard 10/1000 µs waveform. This value is measured per ANSI/IEEE C62.35 and defines the upper voltage limit imposed on protected circuitry during worst-case transient events - critical for ensuring downstream ICs remain within absolute maximum ratings.
Is the 1.5SMC22A suitable for bidirectional signal line protection?
No, the 1.5SMC22A is a unidirectional TVS diode intended for DC power rail protection only. For bidirectional applications such as AC lines or differential buses (e.g., RS-485), the 1.5SMC22CA variant must be used - it features symmetrical breakdown in both polarities and is explicitly validated for bipolar operation per the datasheet's "Devices for Bipolar Applications" section.
Does the 1.5SMC22A meet automotive qualification standards beyond ISO 7637-2?
The 1.5SMC22A is validated for ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b, but it is not AEC-Q200 qualified. While its construction (glass-passivated junction, MSL-1 rating, -55 °C to +150 °C operating range) supports automotive under-hood use, formal AEC-Q200 stress testing and lot traceability are not claimed in the official documentation - design-in requires additional system-level validation per OEM requirements.
What is the thermal resistance from junction to ambient for the 1.5SMC22A in standard JEDEC PCB layout?
The 1.5SMC22A has a junction-to-ambient thermal resistance (RθJA) of 50 °C/W when mounted on a standard 1-inch² FR-4 PCB with 2 oz copper and no thermal vias. This value assumes natural convection cooling and is used to calculate junction temperature rise under steady-state power dissipation (e.g., 6.5 W → ΔT = 325 °C, confirming that continuous DC operation is not feasible - it is rated for transient-only duty).
How does the 1.5SMC22A compare to the 1.5SMC22 in terms of leakage and clamping performance?
The 1.5SMC22A offers tighter VBR tolerance (20.9–23.1 V vs. 19.8–24.2 V for 1.5SMC22) and lower maximum clamping voltage (30.6 V vs. 31.9 V at same IPPM). Its VWM is also higher (18.8 V vs. 17.8 V), reducing leakage risk near system operating voltage - making the 'A' suffix version preferable for precision 24 V systems where margin to trip point is critical.
1.5SMC22A 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):
- 18.8V
- Voltage - Breakdown (Min):
- 20.9V
- Voltage - Clamping (Max) @ Ipp:
- 30.6V
- Current - Peak Pulse (10/1000µs):
- 51A
- 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)
1.5SMC22A FAQ
1.How can I place an order for 1.5SMC22A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC22A 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 1.5SMC22A reliable?
The price and inventory of 1.5SMC22A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC22A is usually 5 days.
3.What payment methods are accepted for 1.5SMC22A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC22A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC22A?
1.5SMC22A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC22A 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 1.5SMC22A?
For technical support, including 1.5SMC22A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC22A requirements.
6.How does Aetrix verify that 1.5SMC22A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC22A 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 1.5SMC22A meets industry standards.
7.What is the process for return or replacement of 1.5SMC22A?
All 1.5SMC22A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC22A, 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 1.5SMC22A part is unused and in its original packaging.
Return procedure for 1.5SMC22A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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