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STMicroelectronics STIEC45-24ACS
- Part No.:
- STIEC45-24ACS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-24ACS.pdf
- Description:
- TVS DIODE 24VWM 42VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,248
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Product details
Overview
STIEC45-24ACS from STMicroelectronics is a bidirectional Transil™ TVS diode designed for IEC 61000-4-5 surge protection on DC power lines, with 24 V stand-off voltage (VRM), 28.2 V minimum breakdown voltage (VBR), and 42 V maximum clamping voltage (VCL) at 500 A (8/20 μs). It delivers 500 A peak pulse current, operates up to 150 °C junction temperature, and features low leakage (0.2 μA at 25 °C), packaged in JEDEC-registered SMC (DO-214AB) for industrial power supply protection.
For engineers reviewing the STIEC45-24ACS datasheet, STIEC45-24ACS pinout, STIEC45-24ACS application, or STIEC45-24ACS equivalent, key selection criteria include bidirectional clamping behavior, 42 V clamping at 500 A, SMC package thermal resistance (Rth(j-l) = 15 °C/W), IEC 61000-4-2/4-4/4-5 compliance, and suitability for high-reliability DC input stage protection in telecom and industrial equipment.
Technical Context
The STIEC45-24ACS is a planar silicon avalanche diode optimized for transient overvoltage suppression in bidirectional signal or power line configurations. Its clamping initiates symmetrically at VBR in both polarities, with dynamic resistance (RD) of 0.025 Ω enabling predictable VCL scaling per VCLmax = RD × IPP + VBRmax.
It supports full IEC 61000-4-5 Level 4 (4 kV common mode, 334 A) and Level 2 (1 kV differential mode, 500 A) surge immunity, while maintaining low leakage (≤1 μA at 85 °C) and stable VBR temperature coefficient (αT = 9.6 × 10⁻⁴ /°C) across –55 °C to +150 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 24 V - Maximum continuous reverse working voltage before clamping onset |
| Breakdown Voltage (VBR min) | 26.7 V at 1 mA - Guaranteed avalanche conduction threshold in both directions |
| Clamping Voltage (VCL max) | 42 V at 500 A (8/20 μs) - Peak voltage seen by protected circuit during worst-case surge |
| Peak Pulse Current (Ipp) | 500 A (8/20 μs) - Surge handling capacity matching IEC 61000-4-5 Level 2 differential mode |
| Leakage Current (IRM) | 0.2 μA at 24 V, 25 °C - Minimal standby power loss and noise coupling in high-impedance circuits |
| Junction Temp Range (Tj) | –55 °C to +150 °C - Enables use in enclosed industrial enclosures without derating |
| Dynamic Resistance (RD) | 0.025 Ω - Enables accurate clamping voltage prediction across varying surge currents |
Pinout & Package
STIEC45-24ACS is housed in an SMC package (JEDEC DO-214AB), with two terminals: Cathode and Anode arranged in a symmetrical bidirectional configuration. The package features a 7.75–8.15 mm body width (E), 5.55–6.25 mm length (D), and 1.90–2.45 mm height (A1), optimized for high thermal dissipation via PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Surge return path (bidirectional) | Conducts transient current in either polarity; no fixed polarity reference |
| Cathode | Surge return path (bidirectional) | Identical role to Anode; device functions identically regardless of orientation |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | VBR matches within ±0.5 V between polarities, ensuring balanced protection on AC-coupled or floating rails |
| High-temperature reliability | Rated for 150 °C Tj with only 410 A derated Ipp - maintains >80% surge capability at max operating temp |
| Low dynamic resistance | RD = 0.025 Ω enables <1 V increase in VCL per 40 A surge increment - critical for tight voltage margin designs |
| IEC 61000-4-5 Level 4 compliance | Validated at 4 kV (12 Ω source) common-mode surge - meets telecom infrastructure surge immunity requirements |
Applications
| Industrial PLC Power Input | Telecom DC Feeder Protection |
|---|---|
Use Scenario: 24 V DC power feed to programmable logic controller backplane exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional TVS placed across input terminals to clamp common-mode transients before they reach upstream DC-DC converters. Use Value: 42 V clamping ensures downstream 24 V-rated regulators remain below absolute maximum ratings during 500 A surges. | Use Scenario: -48 V DC power entry point in outdoor telecom base station cabinets subject to IEC 61000-4-5 Level 4 surges. IC Role / Device Role / Timing Role: Primary surge suppressor on DC input rail, coordinated with secondary MOV and filter stages. Use Value: Low 0.2 μA leakage prevents battery drain in backup-powered systems; 150 °C rating supports operation inside sealed, solar-heated enclosures. |
| Smart Meter DC Supply Rail | Factory Automation Sensor Hub |
Use Scenario: 24 V auxiliary supply input in ANSI C12.22-compliant smart electricity meters installed on utility poles. IC Role / Device Role / Timing Role: First-line transient protector against EFT bursts (IEC 61000-4-4) and surge coupling from nearby switching events. Use Value: 26.7 V VBR ensures reliable triggering before 30 V-rated microcontroller IO pins are stressed; SMC footprint allows compact layout near connector. | Use Scenario: 24 V power distribution node feeding multiple IO-Link sensors in robotic cell control cabinets. IC Role / Device Role / Timing Role: Point-of-load TVS on each 24 V branch to prevent cascading failure from localized surge injection. Use Value: Symmetrical bidirectional clamping eliminates orientation errors during high-volume assembly; RoHS2/ECOPACK® compliance meets EU industrial directives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ24CA (Bourns) | Same VRM (24 V), higher VCL (43.5 V @ 500 A), larger SMB package (Rth(j-a) = 110 °C/W vs 90 °C/W) | Limited to lower-power applications due to higher thermal resistance and less robust IEC 61000-4-5 Level 4 validation | Select when cost sensitivity outweighs clamping voltage margin and thermal performance |
| P6SMB24CA (Littelfuse) | Identical VRM/VBR/VCL specs, but rated only to 175 °C Tj and lacks explicit IEC 61000-4-5 Level 4 test report | Not validated for telecom common-mode 4 kV testing; suitable only for industrial Level 2 or EFT-only environments | Choose where full IEC 61000-4-5 Level 4 certification is not required and higher Tj margin is unnecessary |
Compared with SMBJ24CA and P6SMB24CA, STIEC45-24ACS provides tighter 42 V clamping, lower Rth(j-l) (15 °C/W), and documented IEC 61000-4-5 Level 4 compliance - making it preferred for space-constrained, thermally demanding, and certified infrastructure applications.
Availability
STIEC45-24ACS is available at Aetrix Electronics and suitable for industrial PLC power input, telecom DC feeder protection, smart meter supply rails, and factory automation sensor hubs requiring stable component supply and full IEC 61000-4-5 compliance.
Supply support for STIEC45-24ACS 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, designing and manufacturing analog, microcontroller, power, and sensing solutions for automotive, industrial, and consumer markets.
The STIEC45 series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-reliability DC power line protection in harsh electromagnetic environments - emphasizing low leakage, high-temperature stability, and full IEC 61000-4-2/4-4/4-5 certification.
FAQ
What is the maximum clamping voltage for STIEC45-24ACS under IEC 61000-4-5 Level 2 conditions?
The maximum clamping voltage is 42 V at 500 A (8/20 μs waveform), measured per IEC 61000-4-5 Level 2 differential mode (1 kV, 2 Ω source). This value is guaranteed across the full operating temperature range and confirmed in Table 4 of the official datasheet (DocID16871 Rev 3).
Can STIEC45-24ACS be used in place of a unidirectional TVS like STIEC45-24AS?
No - STIEC45-24ACS is bidirectional and clamps in both polarities, while STIEC45-24AS is unidirectional and conducts only in reverse bias. Substitution requires verifying circuit topology: bidirectional use is mandatory for AC-coupled, floating, or dual-rail inputs; unidirectional is appropriate for grounded DC rails with defined polarity.
Does STIEC45-24ACS meet UL 94 V0 flammability requirements?
Yes - the epoxy resin housing complies with UL 94 V0, as stated in the "Complies with the following standards" section of the datasheet. This certification applies to the molded package material and is verified per UL testing protocols, supporting use in safety-critical industrial enclosures.
What is the recommended PCB pad layout for optimal thermal performance?
The datasheet specifies an IPC 7351-compliant SMC footprint with minimum 100 cm² total copper area (4.4 × 22.4 mm per lead) on FR4 board (35 µm copper). Achieving Rth(j-a) = 90 °C/W requires this layout; reducing copper area increases thermal resistance and may require Ipp derating above 100 °C ambient.
STIEC45-24ACS 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:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 24V
- Voltage - Breakdown (Min):
- 26.7V
- Voltage - Clamping (Max) @ Ipp:
- 42V
- 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
STIEC45-24ACS FAQ
1.How can I place an order for STIEC45-24ACS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-24ACS 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 STIEC45-24ACS reliable?
The price and inventory of STIEC45-24ACS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-24ACS is usually 5 days.
3.What payment methods are accepted for STIEC45-24ACS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-24ACS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-24ACS?
STIEC45-24ACS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-24ACS 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 STIEC45-24ACS?
For technical support, including STIEC45-24ACS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-24ACS requirements.
6.How does Aetrix verify that STIEC45-24ACS is sourced from the original manufacturer or authorized distributors?
All STIEC45-24ACS 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 STIEC45-24ACS meets industry standards.
7.What is the process for return or replacement of STIEC45-24ACS?
All STIEC45-24ACS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-24ACS, 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 STIEC45-24ACS part is unused and in its original packaging.
Return procedure for STIEC45-24ACS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-24ACS Tags
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Diodes Incorporated
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