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Taiwan Semiconductor Corporation 1.5SMC33A
- Part No.:
- 1.5SMC33A
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33A.pdf
- Description:
- TVS DIODE 28.2VWM 45.7VC DO214AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
1.5SMC33A from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AB (SMC) package, rated for 1500W peak pulse power, 31.4–34.7V breakdown voltage at 1mA test current, and 45.7V maximum clamping voltage at 34A peak impulse current. It protects DC power rails and signal lines in telecom and industrial equipment against ESD and lightning-induced transients.
For engineers reviewing the 1.5SMC33A datasheet, 1.5SMC33A pinout, 1.5SMC33A application, or 1.5SMC33A equivalent, key selection criteria include working stand-off voltage (28.2V), leakage current (<1µA at VWM), clamping ratio (VC/VBR ≈ 1.34), thermal resistance (RθJA = 50°C/W), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance.
Technical Context
The 1.5SMC33A operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1ps response time and clamping transients within defined limits per ANSI/IEEE C62.35. Its 1500W peak pulse rating applies to 10/1000µs waveform per Fig.5, derated linearly above 25°C ambient using RθJA = 50°C/W.
Designed for automated SMT placement, it features matte tin-plated leads compliant with J-STD-002, JESD201 Class 2 whisker resistance, and UL 94V-0 molding compound. Polarity is marked by cathode band; bidirectional variants require "C" or "CA" suffix (e.g., 1.5SMC33CA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 31.4V / 34.7V @ IT = 1mA - defines minimum guaranteed breakdown onset and maximum variation across production lot |
| VWM | 28.2V - maximum continuous reverse operating voltage before significant leakage begins |
| VC @ IPPM | 45.7V @ 34A - clamped voltage seen by protected circuit during worst-case 10/1000µs surge |
| PPK | 1500W - peak transient power dissipation capability under standardized 10/1000µs pulse |
| IR @ VWM | <1µA - ensures negligible standby power loss and signal integrity in high-impedance circuits |
| TJ max | +150°C - maximum junction temperature enabling operation in hot industrial environments |
| RθJA | 50°C/W - thermal resistance from junction to ambient, critical for PCB copper area and airflow planning |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, single-die unidirectional configuration with cathode band marking. Weight: 0.210g. Moisture sensitivity level: J-STD-020 Level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient current sink path | Connected to protected line; conducts surge current to ground when VAK exceeds VBR |
| Cathode | Reference node / ground connection | Typically tied to system ground; polarity mark (band) identifies this terminal on device body |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures stable VBR over lifetime and immunity to humidity-induced parameter drift |
| Clamping voltage ≤45.7V at 34A | Provides predictable overvoltage protection margin for 24V/32V systems with ±10% tolerance |
| ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance | Validates robustness against automotive load-dump and inductive switching transients |
| Fast response time <1ps | Enables suppression of ESD events before sensitive ICs experience damage |
| RoHS & halogen-free (IEC 61249-2-21) | Meets global environmental compliance requirements for industrial and telecom end-equipment |
Applications
| Industrial PLC I/O Protection | Telecom Power Input Stage |
|---|---|
Use Scenario: 24V DC input to programmable logic controller module exposed to relay coil flyback and nearby motor switching noise. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +24V rail and chassis ground to clamp transients before they reach upstream DC-DC converter. Use Value: Limits voltage excursion to ≤45.7V, preserving 50V-rated input capacitors and preventing latch-up in supervisor ICs. | Use Scenario: -48V telecom power feed entering base station equipment, subject to lightning-induced surges on long outdoor cable runs. IC Role / Device Role / Timing Role: Primary front-end protection device mounted at board edge, shunting surge energy to ground plane before distribution to downstream regulators. Use Value: Absorbs 1500W peak pulse without failure, maintaining <1µA leakage to avoid loading nominal -48V supply during normal operation. |
| Automotive Body Control Module | Consumer Audio Equipment DC Rail |
Use Scenario: 12V battery-supplied BCM subjected to ISO 7637-2 Pulse 1 (inductive load disconnect) and Pulse 2b (alternator load dump). IC Role / Device Role / Timing Role: Unidirectional TVS on main VBAT input, sized to handle 34A peak current with 45.7V clamping. Use Value: Prevents overvoltage stress on 36V-rated microcontroller and CAN transceivers, meeting OEM EMC validation requirements. | Use Scenario: 32V DC adapter input to powered speaker system, vulnerable to ESD from user interface connectors and AC line coupling. IC Role / Device Role / Timing Role: Secondary-level protection after fuse and common-mode choke, placed directly at DC jack entry point. Use Value: Sub-1ps response captures human-body-model ESD events before audio amplifier ICs suffer gate oxide damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33A (Bourns) | Same DO-214AA (SMB) package, 33V VBR, 1200W PPK, higher RθJA (60°C/W) | Lower power handling requires tighter thermal layout; not drop-in due to smaller SMB footprint | Select when board space is constrained and 1200W rating suffices; verify thermal relief pad design. |
| SMCJ33A (Littelfuse) | Identical DO-214AB (SMC) package, same 1500W rating, VBR = 31.4–34.7V, VC = 45.7V, but higher typical IR (2.0µA @ VWM) | No PCB change required; identical mounting and solder profile | Preferred for direct replacement where leakage budget allows up to 2µA; validated for same ISO 7637-2 pulses. |
Compared with 1.5SMC33A, SMBJ33A offers smaller footprint but reduced surge capacity and thermal performance, while SMCJ33A matches mechanical and electrical specs closely-making it a true form-fit-function alternative for volume production continuity.
Availability
1.5SMC33A is available at Aetrix Electronics and suitable for industrial PLC I/O protection, telecom power input stages, and automotive body control modules requiring stable component supply, RoHS/halogen-free compliance, and ISO 7637-2 validated transient immunity.
Supply support for 1.5SMC33A 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, with global distribution and AEC-Q200 qualified product lines.
The 1.5SMCxxA series was designed specifically for high-reliability surface-mount transient suppression in harsh environments-targeting industrial automation, telecom infrastructure, and automotive subsystems where 1500W surge capability and tight VBR tolerance are mandatory.
FAQ
What is the maximum clamping voltage of the 1.5SMC33A under standard 10/1000µs surge conditions?
The 1.5SMC33A has a maximum clamping voltage (VC) of 45.7V when subjected to its rated peak impulse current of 34A, defined per the 10/1000µs waveform in IEC 61000-4-5 and ANSI/IEEE C62.35. This value is measured at TA = 25°C and guarantees protection margin for 24V–32V systems. The 1.5SMC33A datasheet specifies this as an absolute maximum limit across all production units.
Is the 1.5SMC33A suitable for bidirectional transient protection?
No-the 1.5SMC33A is a unidirectional TVS diode intended for DC line protection with defined anode-cathode polarity. For bidirectional applications such as AC lines or data bus protection, use the 1.5SMC33CA variant, which features symmetrical breakdown in both directions. The 1.5SMC33A's cathode band marking and electrical specs apply only to reverse-biased operation.
What is the working stand-off voltage (VWM) of the 1.5SMC33A, and why does it matter?
The 1.5SMC33A has a working stand-off voltage (VWM) of 28.2V, meaning it remains in high-impedance state below this voltage with leakage <1µA. This value ensures reliable blocking of normal operating voltage (e.g., 24V nominal rails) while allowing fast transition into conduction when transients exceed VBR. Selecting VWM ≥110% of system VDC prevents false triggering-critical for stable 1.5SMC33A deployment.
Does the 1.5SMC33A meet automotive transient immunity standards?
Yes-the 1.5SMC33A meets ISO 7637-2 Pulse 1 (inductive switch-off), Pulse 2a/2b (battery interruption and alternator load dump), and Pulse 3a/3b (capacitive coupling), making it suitable for automotive body control modules and infotainment power inputs. Its 1500W rating and 45.7V clamping align with OEM requirements for 12V/24V systems. Always validate final layout per vehicle-specific EMC test plans alongside the 1.5SMC33A.
What is the thermal resistance (RθJA) of the 1.5SMC33A, and how does it affect PCB layout?
The 1.5SMC33A has a junction-to-ambient thermal resistance (RθJA) of 50°C/W under standard JEDEC test conditions. This means each watt of sustained power raises junction temperature by 50°C above ambient-so at 1W dissipation in still air, TJ rises ~50°C. To maintain TJ ≤150°C, PCB layout must include adequate copper pour (≥100mm² per side) and minimize trace length; the 1.5SMC33A's DO-214AB package relies heavily on board-level thermal management.
1.5SMC33A 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):
- 28.2V
- Voltage - Breakdown (Min):
- 31.4V
- Voltage - Clamping (Max) @ Ipp:
- 45.7V
- Current - Peak Pulse (10/1000µs):
- 34A
- 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)
1.5SMC33A FAQ
1.How can I place an order for 1.5SMC33A through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33A 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 1.5SMC33A reliable?
The price and inventory of 1.5SMC33A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33A is usually 5 days.
3.What payment methods are accepted for 1.5SMC33A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33A?
1.5SMC33A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33A 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 1.5SMC33A?
For technical support, including 1.5SMC33A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33A requirements.
6.How does Aetrix verify that 1.5SMC33A is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33A 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 1.5SMC33A meets industry standards.
7.What is the process for return or replacement of 1.5SMC33A?
All 1.5SMC33A units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33A, 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 1.5SMC33A part is unused and in its original packaging.
Return procedure for 1.5SMC33A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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