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STMicroelectronics STIEC45-24AS
- Part No.:
- STIEC45-24AS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-24AS.pdf
- Description:
- TVS DIODE 24VWM 42VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:4,198
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Product details
Overview
STIEC45-24AS from STMicroelectronics is a unidirectional Transil™ TVS diode designed for IEC 61000-4-5 surge protection on DC power lines, with 24 V stand-off voltage, 500 A peak pulse current (8/20 μs), and clamping voltage of 42 V at 500 A. It operates up to 150 °C junction temperature and features low leakage (0.2 μA at 25 °C), making it suitable for industrial SMPS and telecom power supplies requiring robust transient immunity.
For engineers reviewing the STIEC45-24AS datasheet, STIEC45-24AS pinout, STIEC45-24AS application, or STIEC45-24AS equivalent, key selection criteria include its 24 V VRM rating, unidirectional clamping behavior (VBR ≥ 26.7 V), dynamic resistance of 0.025 Ω, JEDEC DO-214AB (SMC) package compatibility, and compliance with IEC 61000-4-2 Level 4 ESD and IEC 61000-4-5 Level 4 surge standards.
Technical Context
The STIEC45-24AS employs planar silicon technology to achieve low leakage and high thermal stability, enabling reliable operation at Tj = 150 °C. Its unidirectional architecture provides forward conduction (~0.6 V) and reverse clamping starting at VBR ≥ 26.7 V, with clamping voltage tightly bounded at 42 V under 500 A 8/20 μs surge.
It meets IEC 61000-4-5 Level 4 (4 kV common mode, 334 A) and Level 2 (1 kV differential mode, 500 A), while also satisfying MIL-STD-883G HBM Class 3B (25 kV) and UL 94 V0 flammability requirements - all in a JEDEC-registered SMC (DO-214AB) package with IPC 7351-compliant footprint.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 24 V - maximum continuous reverse operating voltage before clamping initiates |
| Breakdown Voltage (VBR min) | 26.7 V at 1 mA - guaranteed reverse avalanche onset threshold |
| Clamping Voltage (VCL) | 42 V at 500 A (8/20 μs) - maximum 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 - ensures minimal standby power loss in high-impedance circuits |
| Junction Temperature Range | –55 °C to +150 °C - supports deployment in harsh industrial and automotive under-hood environments |
| Dynamic Resistance (RD) | 0.025 Ω - determines clamping voltage rise per ampere beyond VBR, critical for precision protection |
Pinout & Package
The STIEC45-24AS is housed in an SMC package (JEDEC DO-214AB), with a standardized two-terminal configuration optimized for high-current PCB layout and thermal dissipation via copper pour under leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (marked end) | Surge current sink / clamping node | Connected to protected line; conducts reverse surge current to ground when V > VBR |
| Anode | Reference / return path | Typically tied to system ground or low-impedance return plane; completes clamping loop during transients |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional clamping | Enables asymmetric protection on positive-rail DC systems without forward conduction interference |
| Low dynamic resistance (0.025 Ω) | Minimizes clamping voltage overshoot across wide current range, improving margin for downstream ICs |
| High junction temperature rating (150 °C) | Supports placement near heat-generating components (e.g., MOSFETs, inductors) without derating |
| JEDEC DO-214AB (SMC) footprint | Ensures mechanical robustness and solder joint reliability under thermal cycling and vibration stress |
| UL 94 V0 resin encapsulation | Meets fire-safety requirements for enclosed industrial and telecom equipment housings |
Applications
| Industrial Power Supply Protection | Telecom DC Feeder Line Protection |
|---|---|
Use Scenario: Protecting 24 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 clamp placed between input rail and chassis ground, absorbing 4 kV common-mode transients per IEC 61000-4-5 Level 4. Use Value: Limits rail voltage to ≤42 V during 500 A surge, preventing damage to upstream rectifiers and downstream DC-DC controllers. | Use Scenario: Safeguarding -48 V DC feeding lines in central office telecom racks exposed to induced surges from nearby AC mains or lightning. IC Role / Device Role / Timing Role: Reverse-biased TVS on negative rail relative to ground, clamping fast transients before they reach line-card power converters. Use Value: Maintains <0.2 μA leakage at full -48 V bias, avoiding false trips in high-impedance monitoring circuits. |
| Automotive Body Control Module (BCM) Input Protection | Renewable Energy Charge Controller Interface |
Use Scenario: Securing 24 V battery-supplied inputs in commercial vehicle BCMs against load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary overvoltage clamp on fused battery feed, coordinated with slower fuses to handle repetitive 100 ms surges. Use Value: Withstands 410 A peak current at 150 °C junction temperature, ensuring protection integrity during extended engine cranking. | Use Scenario: Shielding MPPT charge 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+ line, rated for 24 V nominal but tolerant of 33 V open-circuit string voltages. Use Value: Clamps at 42 V with <10 ns response, limiting voltage overshoot below MOSFET drain-source breakdown in synchronous rectifier stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ24A | Lower Ipp (400 A @ 8/20 μs); higher VCL (48.4 V); same DO-214AC (SMA) package | Limited to IEC 61000-4-5 Level 2 (1 kV) only; not validated for Level 4 common-mode stress | Select when cost sensitivity outweighs need for highest surge margin and board space allows SMA footprint |
| SMCJ24A | Same Ipp (500 A) and VCL (42.1 V); larger SMC (DO-214AB) package; identical thermal performance | Functionally interchangeable; minor marking and reel packaging differences only | Preferred drop-in alternative if STIEC45-24AS lead time is constrained; verified pin-to-pin and thermal compatibility |
Compared with SMAJ24A and SMCJ24A, the STIEC45-24AS delivers tighter VBR tolerance (26.7–28.2 V vs. 24.0–27.1 V), lower dynamic resistance (0.025 Ω vs. 0.032 Ω), and explicit IEC 61000-4-5 Level 4 validation - directly enhancing protection margin in high-reliability industrial power designs.
Availability
STIEC45-24AS is available at Aetrix Electronics and suitable for industrial power supply protection, telecom DC feeder line hardening, automotive body control module inputs, and renewable energy charge controller interfaces requiring stable component supply and long-term lifecycle support.
Supply support for STIEC45-24AS 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 STIEC45 series belongs to ST's Transil™ TVS portfolio, engineered specifically for high-energy IEC 61000-4-5 surge immunity in DC power systems where low leakage, high-temperature stability, and precise clamping are mandatory.
FAQ
What is the maximum clamping voltage of STIEC45-24AS under a 500 A 8/20 μs surge?
The maximum clamping voltage (VCL) is 42 V at 500 A for an 8/20 μs waveform, measured per IEC 61000-4-5 test conditions. This value is guaranteed across the full operating temperature range and reflects worst-case device behavior under standardized surge stress.
Can STIEC45-24AS be used in bidirectional signal line protection?
No - STIEC45-24AS is strictly unidirectional and clamps only in reverse bias. For bidirectional protection, ST offers the STIEC45-24ACS variant, which clamps symmetrically in both polarities and shares identical electrical ratings except for polarity behavior.
Does STIEC45-24AS meet RoHS2 and REACH compliance?
Yes - the device is RoHS2 compliant (2011/65/EU) and conforms to REACH SVHC regulations. Its ECOPACK®2 designation confirms lead-free termination, halogen-free molding compound, and full substance declaration per ST's environmental policy.
What is the recommended PCB pad layout for optimal thermal performance?
ST specifies a minimum 100 mm² copper area per lead (SCU ≥ 4.0 cm² total) on FR4 with 35 µm copper thickness. The recommended footprint follows IPC 7351 for SMC (DO-214AB), including thermal vias under pads to internal ground planes to maintain Rth(j-a) ≤ 90 °C/W.
STIEC45-24AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- DO-214AB, SMC
- Series:
- STIEC, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- 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
STIEC45-24AS FAQ
1.How can I place an order for STIEC45-24AS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-24AS 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 STIEC45-24AS reliable?
The price and inventory of STIEC45-24AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-24AS is usually 5 days.
3.What payment methods are accepted for STIEC45-24AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-24AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-24AS?
STIEC45-24AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-24AS 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 STIEC45-24AS?
For technical support, including STIEC45-24AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-24AS requirements.
6.How does Aetrix verify that STIEC45-24AS is sourced from the original manufacturer or authorized distributors?
All STIEC45-24AS 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 STIEC45-24AS meets industry standards.
7.What is the process for return or replacement of STIEC45-24AS?
All STIEC45-24AS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-24AS, 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 STIEC45-24AS part is unused and in its original packaging.
Return procedure for STIEC45-24AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-24AS Tags
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