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STMicroelectronics STIEC45-26ACS
- Part No.:
- STIEC45-26ACS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-26ACS.pdf
- Description:
- TVS DIODE 26VWM 45VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:9,277
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Product details
Overview
STIEC45-26ACS from STMicroelectronics is a bidirectional Transil™ TVS diode designed for IEC 61000-4-5 Level 4 surge protection on DC power lines, with 26 V stand-off voltage (VRM), 30.3 V typical breakdown voltage (VBR), and 45 V 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 @ 25 °C), housed in JEDEC-registered SMC (DO-214AB) package.
For engineers reviewing the STIEC45-26ACS datasheet, STIEC45-26ACS pinout, STIEC45-26ACS application, or STIEC45-26ACS equivalent, key selection criteria include bidirectional clamping symmetry, 45 V max clamping at 500 A, thermal resistance (Rth(j-l) = 15 °C/W), IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact), and compliance with MIL-STD-883G HBM (25 kV).
Technical Context
This bidirectional TVS uses planar silicon technology to achieve symmetrical clamping in both polarities starting at VBR, enabling robust transient suppression for AC-coupled or floating DC bus interfaces. Its low dynamic resistance (RD = 0.026 Ω) ensures minimal voltage overshoot during high-current surges, while the 90 °C/W junction-to-ambient thermal resistance (on recommended PCB layout) supports sustained operation under repeated transients.
The device meets IEC 61000-4-5 Level 4 (4 kV common mode, 334 A) and Level 2 (1 kV differential mode, 500 A), with verified performance across -55 °C to +150 °C operating junction range. Its UL 94 V0 resin housing and RoHS2 compliance support safety-critical industrial and telecom power supply designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 26 V - Maximum continuous reverse voltage before significant leakage; defines operating margin below clamping threshold. |
| Breakdown Voltage (VBR) | 28.9–31.9 V (min–max @ 1 mA) - Voltage at which avalanche conduction begins; sets precise trigger point for transient response. |
| Clamping Voltage (VCL) | 45 V @ 500 A (8/20 μs) - Maximum voltage seen by protected circuit during worst-case surge; determines downstream component stress. |
| Peak Pulse Current (Ipp) | 500 A (8/20 μs waveform) - Surge handling capacity matching IEC 61000-4-5 Level 2 differential mode requirement. |
| Leakage Current (IRM) | 0.2 μA @ 25 °C - Ultra-low standby loss critical for battery-backed or high-impedance sensing circuits. |
| Junction Temperature (Tj max) | +150 °C - Enables reliable operation in thermally constrained environments like enclosed SMPS or outdoor telecom equipment. |
| Dynamic Resistance (RD) | 0.026 Ω - Low impedance limits voltage rise during fast transients; directly impacts VCL via VCL = VBR + RD × Ipp. |
Pinout & Package
The STIEC45-26ACS is housed in an SMC package (JEDEC DO-214AB), featuring two terminals in a surface-mount, gull-wing configuration with standardized IPC-7351 footprint. The package provides mechanical robustness, high thermal dissipation via leads, and compatibility with automated reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Transient current entry (negative polarity) | Accepts surge current during negative half-cycle; forms symmetrical clamping path with Cathode. |
| Cathode (K) | Transient current entry (positive polarity) | Accepts surge current during positive half-cycle; enables bidirectional protection without external polarity constraints. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | Identical VBR and VCL characteristics in both directions, eliminating need for polarity-aware placement in AC or floating DC lines. |
| High-temperature reliability | Rated for continuous operation up to +150 °C junction temperature, supporting compact, fanless power systems. |
| Low dynamic resistance | 0.026 Ω enables tight clamping control and predictable VCL across production lot and temperature range. |
| IEC 61000-4-5 Level 4 compliance | Validated for 4 kV common-mode surge (334 A, R = 12 Ω), meeting stringent industrial and telecom infrastructure requirements. |
| UL 94 V0 flammability rating | Self-extinguishing epoxy housing prevents fire propagation in safety-critical power distribution assemblies. |
Applications
| Industrial PLC Power Inputs | Telecom DC Feeds (48 V) |
|---|---|
Use Scenario: Protection of 24 V DC input rails in programmable logic controllers exposed to lightning-induced surges on field wiring. IC Role / Device Role / Timing Role: Bidirectional TVS clamp limiting transient overvoltage to ≤45 V during 500 A 8/20 μs events. Use Value: Prevents damage to upstream DC/DC converters and downstream microcontroller power domains without adding polarity-sensitive design constraints. | Use Scenario: Surge suppression on -48 V telecom power feeds where differential and common-mode transients coexist. IC Role / Device Role / Timing Role: Symmetrical clamping element absorbing both polarities of IEC 61000-4-5 Level 2 (500 A) and Level 4 (334 A) surges. Use Value: Maintains system uptime by preventing latch-up or burnout in line-card power supervisors and hot-swap controllers. |
| Smart Meter DC Power Rails | Automotive Body Control Modules |
Use Scenario: Protecting 3.3 V or 5 V auxiliary rails derived from main meter supply against EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Low-leakage (0.2 μA) transient suppressor preserving accuracy of metrology ADC reference paths. Use Value: Ensures long-term calibration stability by avoiding leakage-induced offset drift in precision analog front-ends. | Use Scenario: Safeguarding 12 V/24 V power inputs in BCMs subjected to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Secondary surge limiter complementing primary TVS arrays, handling residual fast transients after front-end filtering. Use Value: Reduces failure rate in CAN transceiver power domains by limiting clamped voltage to safe levels for 3.3 V LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional TVS protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ26CA (Bourns) | Same VRM (26 V), higher VCL (49.9 V @ 500 A), larger SMB package (DO-214AA), Rth(j-a) = 110 °C/W. | Lower power density; less suitable for space-constrained 48 V telecom modules. | Select when cost sensitivity outweighs thermal performance and board area constraints. |
| P6SMB26CA (Littelfuse) | Same VRM (26 V), identical VCL (45 V @ 500 A), same SMC package, but lower Ipp rating (400 A) and no MIL-STD-883G HBM validation. | Lacks 25 kV HBM rating; not recommended for high-ESD-risk manufacturing or field-replaceable modules. | Choose only for non-safety-critical consumer-grade power supplies with relaxed ESD requirements. |
Compared with SMBJ26CA and P6SMB26CA, STIEC45-26ACS offers superior thermal performance (Rth(j-l) = 15 °C/W), full IEC 61000-4-5 Level 4 validation, and MIL-STD-883G HBM certification-making it optimal for industrial and telecom infrastructure where reliability under repeated surge stress is mandatory.
Availability
STIEC45-26ACS is available at Aetrix Electronics and suitable for industrial PLC power inputs, telecom DC feeds (48 V), smart meter DC power rails, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for STIEC45-26ACS 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 microcontrollers for industrial, automotive, 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 operation, and full IEC 61000-4-x compliance.
FAQ
What is the maximum clamping voltage of STIEC45-26ACS at 300 A (8/20 μs)?
Using the dynamic resistance formula VCL = VBR(max) + RD × Ipp, with VBR(max) = 31.9 V and RD = 0.026 Ω, the calculated clamping voltage at 300 A is 40.7 V. This aligns with the device's linear clamping behavior confirmed in Figure 4 of the datasheet, where VCL scales predictably below 500 A.
Can STIEC45-26ACS replace unidirectional STIEC45-26AS in a circuit?
No-STIEC45-26ACS is bidirectional and clamps symmetrically in both polarities, whereas STIEC45-26AS clamps only in reverse and conducts forward at ~0.6 V. Substitution would cause unintended forward conduction in DC-biased lines, risking short-circuit or incorrect biasing of downstream components.
Does STIEC45-26ACS meet automotive AEC-Q200 requirements?
No-the STIEC45-26ACS is not AEC-Q200 qualified. While it operates up to +150 °C and passes MIL-STD-883G HBM testing, it lacks the full stress test suite (temperature cycling, vibration, board flex) required for automotive qualification. For AEC-Q200-compliant alternatives, consider ST's SMAJ26CA-Q or similar qualified variants.
What PCB pad layout is recommended to achieve the 90 °C/W Rth(j-a) value?
The 90 °C/W junction-to-ambient thermal resistance is achieved using the recommended footprint in Figure 12: 10 mm² copper pour per lead (minimum), FR4 substrate, 35 µm copper thickness, and no thermal relief. Deviations-such as smaller pads, thinner copper, or thermal reliefs-will increase Rth(j-a) and reduce surge endurance under repeated stress.
STIEC45-26ACS 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):
- 26V
- Voltage - Breakdown (Min):
- 28.9V
- Voltage - Clamping (Max) @ Ipp:
- 45V
- 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
STIEC45-26ACS FAQ
1.How can I place an order for STIEC45-26ACS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-26ACS 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 STIEC45-26ACS reliable?
The price and inventory of STIEC45-26ACS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-26ACS is usually 5 days.
3.What payment methods are accepted for STIEC45-26ACS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-26ACS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-26ACS?
STIEC45-26ACS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-26ACS 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 STIEC45-26ACS?
For technical support, including STIEC45-26ACS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-26ACS requirements.
6.How does Aetrix verify that STIEC45-26ACS is sourced from the original manufacturer or authorized distributors?
All STIEC45-26ACS 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 STIEC45-26ACS meets industry standards.
7.What is the process for return or replacement of STIEC45-26ACS?
All STIEC45-26ACS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-26ACS, 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 STIEC45-26ACS part is unused and in its original packaging.
Return procedure for STIEC45-26ACS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-26ACS Tags
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