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STMicroelectronics STIEC45-28ACS
- Part No.:
- STIEC45-28ACS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-28ACS.pdf
- Description:
- TVS DIODE 28VWM 49VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:5,943
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Product details
Overview
STIEC45-28ACS from STMicroelectronics is a bidirectional Transil™ TVS diode designed for IEC 61000-4-5 Level 4 surge protection on DC power lines, with 28 V stand-off voltage, 49 V max clamping voltage at 500 A (8/20 μs), 0.2 μA leakage at 25 °C, and SMC (DO-214AB) package. It protects industrial power supplies and telecom interfaces against lightning-induced surges and EFT.
For engineers reviewing the STIEC45-28ACS datasheet, STIEC45-28ACS pinout, STIEC45-28ACS application, or STIEC45-28ACS equivalent, key selection criteria include bidirectional clamping symmetry, 150 °C junction temperature rating, low dynamic resistance (0.029 Ω), and compliance with IEC 61000-4-2 Level 4 (15 kV air discharge) and MIL-STD-883H Class 3B (25 kV HBM).
Technical Context
The STIEC45-28ACS operates as a voltage-clamping transient suppressor using planar silicon avalanche technology. Its bidirectional structure ensures symmetrical breakdown at ±31.1–34.3 V (VBR min–max), enabling protection of balanced signal lines or AC-coupled rails without polarity constraints.
It delivers 500 A peak pulse current under 8/20 μs waveform at Tj = 25 °C, retaining 410 A capability at Tj = 150 °C. Thermal resistance is 15 °C/W (junction-to-leads) and 90 °C/W (junction-to-ambient on recommended pad layout), supporting high-reliability operation in compact SMPS and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 28 V - Maximum continuous reverse working voltage before clamping initiates |
| Breakdown Voltage (VBR) | 31.1–34.3 V at 1 mA - Ensures reliable triggering margin above nominal rail |
| Clamping Voltage (VCL) | 49 V at 500 A (8/20 μs) - Limits transient overvoltage to safe levels for downstream ICs |
| Peak Pulse Current (IPP) | 500 A (8/20 μs) - Withstands IEC 61000-4-5 Level 4 common-mode surge (4 kV, R = 12 Ω) |
| Leakage Current (IR) | 0.2 μA at 25 °C - Minimizes standby power loss in battery-backed systems |
| Junction Temperature Range | −55 to +150 °C - Enables deployment in automotive engine compartments and industrial enclosures |
| Dynamic Resistance (RD) | 0.029 Ω - Low impedance during clamping reduces voltage overshoot under fast-rising transients |
Pinout & Package
The STIEC45-28ACS is housed in an SMC package (JEDEC DO-214AB), with two terminals: Cathode and Anode arranged in a symmetrical bidirectional configuration. The device has no polarity marking distinction-both terminals behave identically under reverse bias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Transient return path (bidirectional) | Acts as cathode during negative transients; forms symmetrical clamping node with cathode |
| Cathode | Transient return path (bidirectional) | Acts as anode during positive transients; completes low-impedance surge shunt path |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL in both polarities enables protection of AC-coupled or floating interfaces without external polarity management |
| High-temperature surge retention | Maintains 410 A (8/20 μs) clamping capability at Tj = 150 °C - critical for enclosed power converters with limited airflow |
| Low dynamic resistance | 0.029 Ω minimizes VCL rise under high di/dt surges, improving protection margin for sensitive 3.3 V or 5 V logic |
| JEDEC-registered SMC footprint | DO-214AB outline ensures mechanical compatibility with automated placement and IPC-7351-compliant PCB land patterns |
Applications
| Industrial Power Supply Protection | Telecom Line Interface |
|---|---|
Use Scenario: 24 V DC input stage of programmable logic controller (PLC) power module exposed to lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Primary surge suppression device placed upstream of DC-DC converter input, clamping transients before they reach switching controller and gate drivers. Use Value: Limits 4 kV IEC 61000-4-5 common-mode surge to ≤49 V, preventing latch-up or overvoltage damage to 40 V-rated MOSFETs and PWM ICs. | Use Scenario: Protection of RS-485 transceiver bus lines in outdoor base station equipment subject to induced surges from nearby lightning strikes. IC Role / Device Role / Timing Role: Bidirectional transient voltage suppressor across differential pair (A/B), referenced to ground via low-inductance layout. Use Value: Symmetrical clamping preserves signal integrity during ±500 A differential-mode surges while maintaining <1 nF junction capacitance at 0 V bias. |
| Automotive Body Control Module | Smart Meter Power Input |
Use Scenario: 12 V battery-supplied body control unit (BCU) requiring ISO 7637-2 and IEC 61000-4-5 compliance in harsh vehicle environments. IC Role / Device Role / Timing Role: Secondary-level TVS on main power rail after fuse and primary filter, handling load-dump and alternator ripple transients. Use Value: 150 °C operating junction temperature supports under-hood mounting; 0.2 μA leakage avoids battery drain in sleep mode. | Use Scenario: M-Bus or PLC-based smart electricity meter with direct connection to utility distribution lines prone to grid switching transients. IC Role / Device Role / Timing Role: Standoff-rated TVS on 24 V auxiliary supply input, coordinated with MOV and gas discharge tube in multi-stage protection network. Use Value: 28 V VRM provides optimal margin above nominal 24 V rail while enabling fast response (<1 ns) to sub-microsecond EFT bursts per IEC 61000-4-4. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ28CA | Same 28 V VRM, but lower IPP = 100 A (8/20 μs); higher VCL = 45.4 V at 100 A | Rated only for IEC 61000-4-5 Level 2 (1 kV); insufficient for Level 4 common-mode requirements | Select when cost sensitivity outweighs surge robustness, and system-level testing confirms 100 A suffices |
| SMCJ28CA | Same SMC package and 28 V rating, but IPP = 200 A (8/20 μs); VCL = 48.4 V at 200 A | Lacks guaranteed 500 A performance at Tj = 150 °C; not validated for sustained high-temp surge duty | Acceptable for ambient-temperature applications where full 500 A headroom is not required |
Compared with SMBJ28CA and SMCJ28CA, STIEC45-28ACS uniquely delivers certified 500 A surge handling at 150 °C junction temperature and meets IEC 61000-4-5 Level 4 - making it the only option for high-reliability industrial power inputs where thermal derating and regulatory compliance are non-negotiable.
Availability
STIEC45-28ACS is available at Aetrix Electronics and suitable for industrial power supply protection, telecom line interface, automotive body control modules, and smart meter power inputs requiring stable component supply and long-term lifecycle support.
Supply support for STIEC45-28ACS 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
The Transil™ TVS series targets high-reliability transient suppression in mission-critical power and interface circuits, emphasizing low leakage, high-temperature stability, and strict compliance with IEC, MIL-STD, and UL safety standards.
FAQ
What is the maximum clamping voltage of STIEC45-28ACS at 500 A?
The maximum clamping voltage is 49 V under 8/20 μs surge conditions at Tamb = 25 °C, as specified in Table 4 of the official datasheet (DocID16871 Rev 3). This value is measured across the device terminals during peak current and defines the upper voltage limit imposed on protected circuitry.
Is STIEC45-28ACS unidirectional or bidirectional?
STIEC45-28ACS is a bidirectional TVS diode, meaning it clamps transients symmetrically in both polarities starting at VBR ≈ 31.1–34.3 V. The "ACS" suffix explicitly denotes bidirectional construction, unlike "AS" variants which are unidirectional with forward conduction near 0.6 V.
Does STIEC45-28ACS meet RoHS and REACH requirements?
Yes - the device is RoHS2 compliant per the datasheet (Section "Features"), and its ECOPACK® packaging meets EU Directive 2011/65/EU. STMicroelectronics confirms full REACH SVHC compliance through its material declarations, with no substances above threshold concentrations in the finished device.
What is the recommended PCB footprint for STIEC45-28ACS?
The recommended footprint follows IPC-7351 for SMC (DO-214AB), with pad dimensions matching Figure 12 in the datasheet: 2.9 mm × 2.4 mm pads spaced 5.0 mm center-to-center, 1.5 mm solder mask opening, and ≥100 mm² copper pour per terminal to achieve the specified 90 °C/W junction-to-ambient thermal resistance.
STIEC45-28ACS 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):
- 28V
- Voltage - Breakdown (Min):
- 31.1V
- Voltage - Clamping (Max) @ Ipp:
- 49V
- 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
STIEC45-28ACS FAQ
1.How can I place an order for STIEC45-28ACS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-28ACS 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 STIEC45-28ACS reliable?
The price and inventory of STIEC45-28ACS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-28ACS is usually 5 days.
3.What payment methods are accepted for STIEC45-28ACS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-28ACS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-28ACS?
STIEC45-28ACS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-28ACS 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 STIEC45-28ACS?
For technical support, including STIEC45-28ACS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-28ACS requirements.
6.How does Aetrix verify that STIEC45-28ACS is sourced from the original manufacturer or authorized distributors?
All STIEC45-28ACS 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 STIEC45-28ACS meets industry standards.
7.What is the process for return or replacement of STIEC45-28ACS?
All STIEC45-28ACS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-28ACS, 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 STIEC45-28ACS part is unused and in its original packaging.
Return procedure for STIEC45-28ACS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-28ACS Tags
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