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STMicroelectronics STIEC45-27AS
- Part No.:
- STIEC45-27AS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-27AS.pdf
- Description:
- TVS DIODE 27VWM 47VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:3,857
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Product details
Overview
STIEC45-27AS from STMicroelectronics is a unidirectional Transil™ TVS diode designed for IEC 61000-4-5 Level 4 surge protection on DC power lines, with 27 V stand-off voltage (VRM), 500 A peak pulse current (8/20 μs), and clamping voltage of 49 V at 500 A. It operates up to 150 °C junction temperature and delivers low leakage (0.2 μA at 25 °C), making it suitable for industrial SMPS and telecom power supply protection.
For engineers reviewing the STIEC45-27AS datasheet, STIEC45-27AS pinout, STIEC45-27AS application, or STIEC45-27AS equivalent, key selection criteria include verified clamping performance at 500 A, thermal resistance (Rth(j-l) = 15 °C/W), JEDEC DO-214AB (SMC) package compatibility, and IEC 61000-4-2/4-4/4-5 compliance documentation.
Technical Context
The STIEC45-27AS employs planar silicon technology optimized for high-reliability transient suppression in DC power rails. Its unidirectional architecture provides forward conduction (~0.6 V) and reverse breakdown (VBR min = 31.1 V) with defined clamping onset, enabling precise overvoltage threshold control in protected circuits.
It meets IEC 61000-4-5 differential mode surge (1 kV, 500 A with 2 Ω source) and common-mode surge (4 kV, 334 A with 12 Ω source), while sustaining 410 A peak pulse current at Tj = 150 °C - critical for thermally constrained industrial power designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 27 V - maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR) | 31.1 V (min), 32.6 V (typ), 34.3 V (max) at 1 mA - defines precise reverse conduction onset |
| Clamping Voltage (VCL) | 49 V at 500 A (8/20 μs) - limits transient voltage seen by downstream circuitry |
| Peak Pulse Current (Ipp) | 500 A (8/20 μs) - validated surge handling per IEC 61000-4-5 Level 2 differential mode |
| Leakage Current (IRM) | 0.2 μA at 27 V, 25 °C - ensures minimal standby power loss in always-on systems |
| Junction Temperature Range | –55 °C to +150 °C - supports operation in harsh industrial environments without derating |
| Dynamic Resistance (RD) | 0.029 Ω - determines VCL rise slope under surge (VCL = RD × IPP + VBRmax) |
Pinout & Package
The STIEC45-27AS is housed in an SMC package (JEDEC DO-214AB), with a standardized 2-terminal configuration: Cathode (pin 1) and Anode (pin 2), mounted on IPC 7351-compliant pads for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Reverse-biased terminal during normal operation | Connected to protected line; conducts during positive transients to ground |
| Anode (A) | Reference/ground return path | Typically tied to system ground; completes clamping current path during surge events |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-5 Level 4 compliance | Validated 4 kV common-mode surge immunity (12 Ω source) for robust infrastructure-grade protection |
| Low thermal resistance | Rth(j-l) = 15 °C/W enables sustained 410 A surge capability at 150 °C junction temperature |
| High-temperature leakage stability | 1 μA max at 85 °C ensures reliability in enclosed power enclosures without thermal runaway risk |
| RoHS2 & UL 94 V0 resin | Meets environmental and flammability requirements for global industrial and telecom certifications |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Lines |
|---|---|
Use Scenario: Protecting 24–32 V DC input rails in programmable logic controllers (PLCs) against lightning-induced surges on factory floor wiring. IC Role / Device Role / Timing Role: Unidirectional TVS placed between input rail and chassis ground to clamp transients before they reach DC-DC converters. Use Value: Limits clamped voltage to ≤49 V at 500 A, preserving downstream 36 V-rated MOSFETs and gate drivers. | Use Scenario: Safeguarding -48 V DC distribution in central office equipment exposed to induced surges from nearby AC mains or lightning coupling. IC Role / Device Role / Timing Role: Reverse-connected across feed line and return to suppress positive-going transients on negative-rail systems. Use Value: Maintains <0.2 μA leakage at –27 V bias, preventing battery drain in backup-powered telecom nodes. |
| Automotive Body Control Modules | Renewable Energy Charge Controllers |
Use Scenario: Shielding 12/24 V power inputs in BCMs from load-dump and ISO 7637-2 pulses in vehicle harnesses. IC Role / Device Role / Timing Role: Primary surge limiter upstream of LDO regulators and CAN transceivers. Use Value: Withstands 150 °C junction temperature, matching under-hood thermal profiles without derating. | Use Scenario: Protecting MPPT controller inputs connected to solar panel strings subject to rapid voltage transients during cloud-edge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on PV+ and PV− terminals to absorb fast-rising open-circuit spikes. Use Value: 31.1–34.3 V VBR range aligns precisely with 27 V nominal string voltage, avoiding false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28A (Bourns) | 28 V VRM, 31.1 V VBR min, 45.4 V VCL at 500 A, SMB package (larger Rth(j-a)) | Higher clamping margin (45.4 V vs. 49 V) but lower thermal robustness at elevated ambient | Select when board space allows larger SMB footprint and lower clamping voltage is prioritized over 150 °C operation |
| P6SMB27A (Littelfuse) | 27 V VRM, 30.0 V VBR min, 43.0 V VCL at 500 A, SMB package, 1000 W rating | Lower VCL improves protection margin but rated only to 175 °C Tj (not validated at 150 °C continuous) | Prefer for cost-sensitive consumer applications where full industrial thermal validation is not required |
Compared with SMBJ28A and P6SMB27A, the STIEC45-27AS offers superior thermal performance (Rth(j-l) = 15 °C/W) and verified 150 °C operation - essential for mission-critical industrial power designs where long-term reliability outweighs minor clamping voltage differences.
Availability
STIEC45-27AS is available at Aetrix Electronics and suitable for industrial power supply protection, telecom DC feeder lines, automotive body control modules, and renewable energy charge controllers requiring stable component supply and full IEC 61000-4-5 compliance.
Supply support for STIEC45-27AS 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, MEMS, and microcontroller technologies for industrial, automotive, and consumer markets.
The Transil™ TVS product line targets high-reliability surge protection in DC power systems, emphasizing low leakage, high-temperature stability, and strict compliance with IEC, MIL-STD, and UL standards.
FAQ
What is the exact clamping voltage of STIEC45-27AS at 500 A (8/20 μs)?
The clamping voltage (VCL) of STIEC45-27AS is 49 V at 500 A with an 8/20 μs waveform, as specified in Table 4 of the official datasheet (DocID16871 Rev 3). This value is measured under standard test conditions (Tamb = 25 °C) and represents the maximum voltage imposed on the protected circuit during a full-rated surge event.
Does STIEC45-27AS meet IEC 61000-4-5 Level 4 for common-mode surges?
Yes - STIEC45-27AS is certified for IEC 61000-4-5 Level 4 common-mode surge (4 kV with 12 Ω source impedance, yielding 334 A), as explicitly stated in the "Complies with the following standards" section of the datasheet. Its 49 V clamping voltage ensures downstream components remain within safe operating limits under this stress condition.
Is the SMC package of STIEC45-27AS compatible with automated PCB assembly?
Yes - the SMC package (JEDEC DO-214AB) uses standard tape-and-reel packaging (EIA-481 compliant, 2500 pcs/reel) and is qualified for reflow soldering per IPC/JEDEC J-STD-020, including peak temperatures up to 260 °C for 10 seconds. The recommended pad layout in Figure 12 ensures reliable tombstoning-free placement.
How does leakage current change with temperature for STIEC45-27AS?
Leakage current increases predictably with junction temperature: 0.2 μA at 25 °C and 1 μA at 85 °C (Table 4, Note column). This behavior is confirmed by Figure 8 (leakage vs. Tj), showing sub-microampere performance remains well within design margins even at elevated ambient temperatures typical in enclosed power systems.
STIEC45-27AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- STIEC, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 27V
- Voltage - Breakdown (Min):
- 30V
- Voltage - Clamping (Max) @ Ipp:
- 47V
- Current - Peak Pulse (10/1000µs):
- 500A (8/20µs)
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMC
STIEC45-27AS FAQ
1.How can I place an order for STIEC45-27AS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-27AS 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 STIEC45-27AS reliable?
The price and inventory of STIEC45-27AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-27AS is usually 5 days.
3.What payment methods are accepted for STIEC45-27AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-27AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-27AS?
STIEC45-27AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-27AS 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 STIEC45-27AS?
For technical support, including STIEC45-27AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-27AS requirements.
6.How does Aetrix verify that STIEC45-27AS is sourced from the original manufacturer or authorized distributors?
All STIEC45-27AS 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 STIEC45-27AS meets industry standards.
7.What is the process for return or replacement of STIEC45-27AS?
All STIEC45-27AS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-27AS, 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 STIEC45-27AS part is unused and in its original packaging.
Return procedure for STIEC45-27AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-27AS Tags
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