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STMicroelectronics STIEC45-30AS
- Part No.:
- STIEC45-30AS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-30AS.pdf
- Description:
- TVS DIODE 30VWM 55VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,531
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Product details
Overview
STIEC45-30AS from STMicroelectronics is a unidirectional Transil™ TVS diode designed for IEC 61000-4-5 surge protection on DC power lines, with 30 V stand-off voltage (VRM), 33.3–36.8 V clamping voltage (VCL) at 500 A (8/20 μs), and 0.2 μA leakage at 25 °C. It operates up to 150 °C junction temperature and is packaged in JEDEC-registered SMC (DO-214AB) for industrial SMPS and telecom power supply protection.
For engineers reviewing the STIEC45-30AS datasheet, STIEC45-30AS pinout, STIEC45-30AS application, or STIEC45-30AS equivalent, key selection criteria include clamping performance under 4 kV IEC 61000-4-5 common-mode surges, thermal resistance (Rth(j-l) = 15 °C/W), low-leakage operation at elevated temperatures, and SMC footprint compatibility with IPC 7351-recommended pad layout.
Technical Context
The STIEC45-30AS employs planar silicon technology to achieve stable breakdown behavior and low leakage across its -55 °C to +150 °C operating junction range. Its unidirectional configuration provides forward conduction near 0.6 V and reverse clamping initiated at VBR ≥33.3 V, enabling precise overvoltage limiting on positive-rail DC systems.
It meets IEC 61000-4-2 Level 4 ESD immunity (15 kV air / 8 kV contact), IEC 61000-4-4 EFT protection, and MIL-STD-883G HBM Class 3B (25 kV), with dynamic resistance RD = 0.036 Ω enabling predictable VCL scaling per VCLmax = RD × IPP + VBRmax.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 30 V - Maximum continuous reverse working voltage before clamping begins |
| Breakdown Voltage (VBR) | 33.3–36.8 V at 1 mA - Defines onset of avalanche conduction under transient stress |
| Clamping Voltage (VCL) | 55 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 current handling capacity at 25 °C ambient |
| Leakage Current (IRM) | 0.2 μA at 25 °C, 1 μA at 85 °C - Ensures minimal standby power loss in high-reliability systems |
| Junction Temp Range (Tj) | -55 to +150 °C - Supports operation in harsh environments including industrial power converters |
| Thermal Resistance (Rth(j-l)) | 15 °C/W - Enables efficient heat transfer from die to PCB leads under sustained surge duty |
Pinout & Package
The STIEC45-30AS is housed in an SMC package (JEDEC DO-214AB), featuring a two-terminal surface-mount outline with cathode band marking. Recommended pad layout follows IPC 7351 standards for optimal thermal dissipation and mechanical reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Forward conduction path | Connects to ground or low-side return in unidirectional clamp configuration |
| Cathode (K) | Reverse-biased clamping node | Connects to protected line (e.g., +30 V rail); clamps transients toward anode when voltage exceeds VBR |
Key Features
| Feature | Design Value |
|---|---|
| IEC 61000-4-5 Level 4 compliance | Withstands 4 kV common-mode surge (12 Ω source) - meets telecom and industrial AC/DC input stage requirements |
| Low dynamic resistance (RD) | 0.036 Ω - minimizes VCL rise under increasing surge current, improving system-level robustness |
| High Tj max rating | 150 °C - enables placement near hot components (e.g., MOSFETs, transformers) without derating |
| Planar silicon construction | Stable VBR temperature coefficient (αT = 9.9 × 10⁻⁴ /°C) - ensures predictable clamping across operating range |
Applications
| Industrial SMPS Input Protection | Telecom DC Power Distribution |
|---|---|
Use Scenario: Protecting primary-side DC bus in 48 V telecom rectifiers against lightning-induced surges. IC Role / Device Role / Timing Role: Unidirectional TVS placed between +48 V rail and chassis ground to clamp differential-mode transients per IEC 61000-4-5 Level 2 (1 kV, 2 Ω). Use Value: Limits peak voltage to ≤55 V during 500 A surges, preventing damage to downstream DC-DC controllers and MOSFET gate drivers. | Use Scenario: Safeguarding backplane power rails in modular base station equipment exposed to conducted surges. IC Role / Device Role / Timing Role: Standoff-rated TVS on +30 V distribution net, activated only during >33.3 V transients to avoid false triggering during normal ripple. Use Value: Delivers <0.2 μA leakage at 25 °C, preserving efficiency in always-on 24/7 infrastructure systems. |
| Automotive Body Control Module (BCM) Power Input | Industrial PLC Analog Input Protection |
Use Scenario: Securing 12–36 V supply inputs in BCMs subjected to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary surge limiter on main power feed, coordinated with upstream fuses and secondary RC filters. Use Value: Maintains Rth(j-l) = 15 °C/W to survive repeated 100–500 A pulses without thermal runaway at 150 °C junction. | Use Scenario: Shielding 4–20 mA loop power inputs in programmable logic controllers from field-wiring induced transients. IC Role / Device Role / Timing Role: Low-capacitance (<100 pF at VRM) unidirectional clamp placed before signal conditioning op-amps. Use Value: Prevents latch-up in precision amplifiers while adding <0.036 Ω series impedance - negligible impact on loop accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ30A | Lower Ipp (100 A vs. 500 A), higher VCL (69 V @ 100 A), SMB package (larger footprint) | Rated for lower-energy surges; unsuitable for IEC 61000-4-5 Level 4 compliance | Select only if system-level surge testing confirms <100 A requirement and board space allows SMB |
| SMCJ30A | Same SMC package, identical VRM/VBR, but VCL = 48.4 V @ 500 A (lower than STIEC45-30AS's 55 V) | Better clamping performance at full rated current; slightly higher leakage (1 μA @ 25 °C) | Prefer when minimizing protected-circuit voltage excursion is critical, accepting marginally higher IR |
Compared with SMBJ30A and SMCJ30A, STIEC45-30AS offers superior surge energy handling (500 A) in the same SMC footprint while maintaining ultra-low leakage-making it optimal for high-reliability, thermally constrained DC power protection where both clamping voltage and long-term stability matter.
Availability
STIEC45-30AS is available at Aetrix Electronics and suitable for industrial SMPS, telecom power distribution, automotive body control modules, and PLC analog input protection requiring stable component supply and full IEC 61000-4-5 Level 4 compliance.
Supply support for STIEC45-30AS 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, delivering innovative solutions across automotive, industrial, power, and digital markets with strong IP and manufacturing capabilities.
The Transil™ TVS product line targets high-reliability transient suppression in mission-critical power and interface circuits, emphasizing low leakage, high-temperature stability, and standardized surge compliance for industrial and telecom infrastructure.
FAQ
What is the maximum clamping voltage of STIEC45-30AS at 300 A (8/20 μs)?
Using the formula VCLmax = RD × IPP + VBRmax, with RD = 0.036 Ω and VBRmax = 36.8 V, the calculated clamping voltage is 47.6 V. This matches measured data showing ~47–48 V at 300 A, confirming predictable voltage limiting below the 55 V spec at full 500 A rating.
Can STIEC45-30AS be used in bidirectional signal line protection?
No - STIEC45-30AS is unidirectional and conducts forward current (~0.6 V drop) when polarity reverses. For bidirectional protection, ST recommends STIEC45-30ACS, which clamps symmetrically above ±33.3 V and has no forward conduction path on either terminal.
How does STIEC45-30AS perform at elevated junction temperatures?
At Tj = 150 °C, its peak pulse current capability remains 410 A (8/20 μs), and VBR increases to ~38.5 V (using αT = 9.9 × 10⁻⁴ /°C). Leakage rises to 1 μA, still well within low-power design limits for industrial applications.
Is the SMC package of STIEC45-30AS compatible with standard reflow profiles?
Yes - it complies with IPC/JEDEC J-STD-020, supporting peak reflow temperatures up to 260 °C for 10 seconds. ST's recommended profile (Figure 19) specifies controlled ramp rates and dwell times to prevent solder joint voiding or package cracking during assembly.
STIEC45-30AS 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):
- 30V
- Voltage - Breakdown (Min):
- 33.3V
- Voltage - Clamping (Max) @ Ipp:
- 55V
- 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
STIEC45-30AS FAQ
1.How can I place an order for STIEC45-30AS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-30AS 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 STIEC45-30AS reliable?
The price and inventory of STIEC45-30AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-30AS is usually 5 days.
3.What payment methods are accepted for STIEC45-30AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-30AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-30AS?
STIEC45-30AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-30AS 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 STIEC45-30AS?
For technical support, including STIEC45-30AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-30AS requirements.
6.How does Aetrix verify that STIEC45-30AS is sourced from the original manufacturer or authorized distributors?
All STIEC45-30AS 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 STIEC45-30AS meets industry standards.
7.What is the process for return or replacement of STIEC45-30AS?
All STIEC45-30AS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-30AS, 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 STIEC45-30AS part is unused and in its original packaging.
Return procedure for STIEC45-30AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-30AS Tags
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