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Taiwan Semiconductor Corporation 1.5SMC33
- Part No.:
- 1.5SMC33
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
1.5SMC33.pdf
- Description:
- 1500W, 33V, 10%, UNIDIRECTIONAL,
- Quantity:
- Payment:
- Shipping:
Inventory:7,234
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Product details
Overview
1.5SMC33 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 33 V breakdown voltage range (29.7–36.3 V), 1500 W peak pulse power rating, 47.7 V maximum clamping voltage at 33 A peak impulse current, and DO-214AB (SMC) package suitable for telecom power input stages.
For engineers reviewing the 1.5SMC33 datasheet, 1.5SMC33 pinout, 1.5SMC33 application, or 1.5SMC33 equivalent, this device is selected for robust ESD and lightning surge immunity in industrial power supplies, automotive body electronics, and PoE-powered equipment where fast clamping (<1 ps response), low leakage (<1 µA at 26.8 V), and ISO 7637-2 Pulse 1/2a/2b/3a/3b compliance are required.
Technical Context
The 1.5SMC33 operates as a unidirectional avalanche diode with glass-passivated junction, optimized for clamping transients on positive-polarity DC lines. Its 26.8 V working stand-off voltage ensures reliable blocking during normal operation while maintaining margin against ripple and tolerance drift.
Thermal performance is defined by 15 °C/W junction-to-case and 50 °C/W junction-to-ambient resistance, enabling sustained dissipation up to 6.5 W at 25 °C ambient. The device meets JESD201 Class 2 whisker resistance and J-STD-020 Moisture Sensitivity Level 1, supporting lead-free reflow without popcorn risk.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VBR min/max | 29.7 V / 36.3 V - defines guaranteed avalanche onset window under 1 mA test current; sets minimum system overvoltage trip threshold |
| VWM | 26.8 V - maximum continuous reverse operating voltage; must exceed nominal rail voltage (e.g., 24 V ±10%) with margin |
| VC@IPPM | 47.7 V at 33 A - clamped voltage during 10/1000 µs surge; determines protected circuit's maximum transient exposure |
| PPK | 1500 W - peak pulse power handling per single 10/1000 µs waveform; supports IEC 61000-4-5 Level 4 (4 kV) surges |
| IR@VWM | <1 µA - ultra-low reverse leakage at stand-off voltage; avoids loading sensitive high-impedance monitoring circuits |
| TJ max | +150 °C - maximum junction temperature; enables operation in sealed enclosures or near heat sources without derating |
| Package | DO-214AB (SMC) - industry-standard surface-mount outline with 7.11 mm × 6.22 mm footprint and 2.3 mm height; compatible with automated pick-and-place |
Pinout & Package
DO-214AB (SMC) package: molded plastic case with matte tin-plated leads, cathode band marking polarity. Leads conform to J-STD-002 solderability and JESD201 Class 2 whisker resistance. Weight: 0.210 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | DC return path / ground reference | Connected to system ground or low-side return; completes clamping path during positive transients |
| Cathode | Protected line input | Connected to line being protected (e.g., +24 V rail); conducts avalanche current when VAK exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enables stable, repeatable avalanche characteristics over 1000+ surge events without parameter drift |
| <1.0 ps response time | Clamps ESD events before downstream ICs experience damaging voltage overshoot; critical for USB, RS-485, and CAN interfaces |
| ISO 7637-2 compliance | Validated for automotive load-dump (Pulse 5a) and supply transients (Pulse 1/2a/2b/3a/3b); supports AEC-Q101 prequalification |
| RoHS & halogen-free | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU; compatible with lead-free assembly and green manufacturing programs |
| UL 94V-0 molding compound | Self-extinguishing encapsulation prevents flame propagation in fault conditions; required for industrial safety certifications |
Applications
| Industrial Power Input Protection | Automotive Body Control Module |
|---|---|
Use Scenario: 24 V DC input stage of PLC I/O module exposed to inductive switching noise and nearby lightning-induced surges. IC Role / Device Role / Timing Role: Primary overvoltage clamp placed upstream of DC-DC converter and microcontroller power domain. Use Value: Limits transient excursions to ≤47.7 V, preventing latch-up or gate oxide damage in 3.3 V/5 V logic and buck controller ICs. |
Use Scenario: LIN bus power rail in door module subjected to battery disconnect/load dump pulses per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Unidirectional TVS connected between LIN VCC and chassis ground to absorb energy from 12 V system transients. Use Value: Withstands 1500 W peak power for 10/1000 µs, ensuring no failure during repeated 100 V/50 ms load dump events. |
| Telecom AC/DC Adapter Output | POE-Powered Device Ethernet Port |
Use Scenario: Secondary-side 24 V output of wall-mount telecom adapter, subject to capacitor discharge and hot-plug transients. IC Role / Device Role / Timing Role: Standoff-rated TVS across output terminals to protect downstream PoE PSE controllers and isolation transformers. Use Value: 26.8 V VWM provides 12% margin above nominal 24 V output, while 47.7 V VC stays below 50 V SELV limit. |
Use Scenario: Data pair protection on IEEE 802.3af/at powered device (PD) Ethernet interface, where DC bias coexists with fast transients. IC Role / Device Role / Timing Role: Unidirectional TVS on each data pair (MDI-X) referenced to common-mode ground to suppress asymmetrical surges. Use Value: Sub-1 ps response captures ESD events before Ethernet PHY transceivers enter destructive breakdown; <1 µA leakage avoids link training errors. |
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; 33 V VBR, 600 W PPK, 53.3 V VC @ 11.3 A | Lower power rating limits use to sub-IEC 61000-4-5 Level 3 environments; unsuitable for ISO 7637-2 Pulse 5a | Select SMBJ33A only for space-constrained designs where 600 W peak power suffices and thermal budget allows higher VC |
| 1.5KE33A (ON Semiconductor) | Through-hole DO-201AE package; identical 33 V VBR, 1500 W PPK, but 53.3 V VC @ 28.3 A | Requires PCB through-hole layout; not compatible with SMT-only production; higher clamping degrades protection margin | Choose 1.5KE33A only for legacy through-hole systems or prototyping where reflow compatibility is not required |
Compared with SMBJ33A and 1.5KE33A, the 1.5SMC33 delivers superior surge immunity in surface-mount form factor-its 47.7 V clamping voltage is 5.6 V lower than SMBJ33A and 5.6 V lower than 1.5KE33A, directly improving system robustness against fast-rising transients without increasing board area.
Availability
1.5SMC33 is available at Aetrix Electronics and suitable for industrial power input protection, automotive body control modules, and PoE-powered device Ethernet ports requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for 1.5SMC33 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 ISO 9001 and IATF 16949 certified facilities.
The 1.5SMC series was developed for high-reliability surface-mount surge protection in automotive, industrial, and telecom infrastructure-emphasizing low clamping, fast response, and AEC-Q101-aligned stress testing.
FAQ
What is the polarity configuration of the 1.5SMC33?
The 1.5SMC33 is a unidirectional TVS diode, with cathode marked by a band on the DO-214AB (SMC) package. It conducts only when anode-to-cathode voltage exceeds the breakdown range (29.7–36.3 V), making it suitable for protecting positive DC rails. Bidirectional variants require "C" or "CA" suffixes (e.g., 1.5SMC33C), which are distinct part numbers-not interchangeable with the 1.5SMC33.
Does the 1.5SMC33 meet automotive transient standards?
Yes, the 1.5SMC33 meets ISO 7637-2 requirements for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery feed interruption), and Pulse 3a/3b (capacitive coupling), verified per manufacturer test reports. While not AEC-Q101 certified out-of-box, its construction-including glass-passivated junction, MSL1 rating, and 150 °C TJ max-supports qualification-ready design-in for automotive body electronics.
What is the maximum clamping voltage of the 1.5SMC33 under standard test conditions?
The 1.5SMC33 has a maximum clamping voltage (VC) of 47.7 V at 33 A peak impulse current (IPPM) under the 10/1000 µs double-exponential waveform per Fig.5 in the datasheet. This value is measured at TA = 25 °C after thermal stabilization and defines the upper voltage limit imposed on protected circuitry during worst-case surge events.
Can the 1.5SMC33 be used in bidirectional signal line protection?
No-the 1.5SMC33 is unidirectional and unsuitable for AC or bidirectional signal lines (e.g., RS-485, CAN, USB D+/D−) without external circuitry. For such applications, use the bidirectional variant 1.5SMC33C or 1.5SMC33CA, which exhibit symmetrical clamping in both polarities and share the same VBR, VC, and PPK ratings-but differ in internal die configuration and marking code (ETJ vs. ETJ-C).
What is the thermal resistance profile of the 1.5SMC33 and how does it affect layout?
The 1.5SMC33 has RθJC = 15 °C/W and RθJA = 50 °C/W. To maintain TJ ≤ 150 °C at full 1500 W surge, PCB copper area must provide ≥200 mm² of 2-oz thermal pad connected to both leads. Layouts omitting thermal relief or using narrow traces will exceed junction limits during repetitive surges-verified via thermal imaging per JEDEC JESD51-1.
1.5SMC33 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):
- 26.8V
- Voltage - Breakdown (Min):
- 29.7V
- Voltage - Clamping (Max) @ Ipp:
- 47.7V
- Current - Peak Pulse (10/1000µs):
- 33A
- 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)
1.5SMC33 FAQ
1.How can I place an order for 1.5SMC33 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1.5SMC33 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 1.5SMC33 reliable?
The price and inventory of 1.5SMC33 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1.5SMC33 is usually 5 days.
3.What payment methods are accepted for 1.5SMC33?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1.5SMC33 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1.5SMC33?
1.5SMC33 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1.5SMC33 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 1.5SMC33?
For technical support, including 1.5SMC33 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1.5SMC33 requirements.
6.How does Aetrix verify that 1.5SMC33 is sourced from the original manufacturer or authorized distributors?
All 1.5SMC33 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 1.5SMC33 meets industry standards.
7.What is the process for return or replacement of 1.5SMC33?
All 1.5SMC33 units undergo pre-shipment inspection (PSI). If there is an issue with 1.5SMC33, 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 1.5SMC33 part is unused and in its original packaging.
Return procedure for 1.5SMC33:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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