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STMicroelectronics STIEC45-33ACS
- Part No.:
- STIEC45-33ACS
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
STIEC45-33ACS.pdf
- Description:
- TVS DIODE 33VWM 59VC SMC
- Quantity:
- Payment:
- Shipping:
Inventory:2,541
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Product details
Overview
STIEC45-33ACS from STMicroelectronics is a bidirectional Transil™ TVS diode designed for IEC 61000-4-5 Level 4 (4 kV common mode) surge protection on DC power lines, with 33 V stand-off voltage, 59 V max clamping voltage at 500 A (8/20 μs), 0.2 μA leakage at 25 °C, and SMC (DO-214AB) package rated to 150 °C junction temperature.
For engineers reviewing the STIEC45-33ACS datasheet, STIEC45-33ACS pinout, STIEC45-33ACS application, or STIEC45-33ACS equivalent, key selection criteria include bidirectional clamping symmetry, low dynamic resistance (0.036 Ω), high peak current capability at elevated temperature (410 A at Tj = 150 °C), and compliance with IEC 61000-4-2 (15 kV air), IEC 61000-4-4, and MIL-STD-883HBM (25 kV).
Technical Context
The STIEC45-33ACS operates as a voltage-clamping transient suppressor using planar silicon avalanche technology, with symmetrical breakdown (VBR min = 36.7 V, typ = 38.6 V, max = 40.6 V) in both polarities. Its low leakage (≤1 μA up to 85 °C) and high thermal robustness (Rth(j-l) = 15 °C/W) support stable operation in high-reliability SMPS and industrial power rails.
It delivers defined clamping performance per IEC 61000-4-5 test waveforms: 500 A (8/20 μs) at 25 °C ambient, derated to 410 A at Tj = 150 °C, with clamping voltage calculated via VCL = RD × IPP + VBRmax (RD = 0.036 Ω). The device meets JEDEC DO-214AB mechanical outline and IPC 7351 footprint standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Stand-off Voltage (VRM) | 33 V - Maximum continuous reverse operating voltage before clamping begins |
| Breakdown Voltage (VBR) | 36.7–40.6 V at 1 mA - Symmetrical avalanche threshold in both directions |
| Clamping Voltage (VCL) | 59 V max at 500 A (8/20 μs) - Peak voltage seen by protected circuit during surge |
| Peak Pulse Current (Ipp) | 500 A (8/20 μs) at 25 °C; 410 A at Tj = 150 °C - Surge handling capacity under thermal stress |
| Leakage Current (IRM) | 0.2 μA at 25 °C; 1 μA at 85 °C - Minimal power loss and noise contribution in standby |
| Dynamic Resistance (RD) | 0.036 Ω - Low impedance during clamping ensures tight voltage control under high di/dt |
| Junction Temperature Range | −55 °C to +150 °C - Enables deployment in automotive under-hood and industrial power supply environments |
Pinout & Package
The STIEC45-33ACS is housed in an SMC package (JEDEC DO-214AB), with two terminals: Cathode (K) and Anode (A), arranged in a symmetrical bidirectional configuration. The package features a gull-wing leadform, 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-power PCB mounting with recommended copper pad area ≥4 cm².
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Positive terminal for reverse-bias conduction | Acts as cathode during negative transients; enables symmetrical clamping in either polarity |
| Cathode (K) | Negative terminal for reverse-bias conduction | Acts as anode during positive transients; forms bidirectional avalanche path with Anode |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional clamping symmetry | VBR matches within ±1.5 V across both polarities, ensuring equal protection for AC-coupled or floating DC rails |
| High-temperature surge capability | 410 A (8/20 μs) at Tj = 150 °C - maintains >80% of room-temp rating under thermal stress |
| Low dynamic resistance | 0.036 Ω - minimizes VCL rise under fast-rising surges (di/dt > 10⁹ A/s) |
| Ultra-low leakage | 0.2 μA @ 25 °C - preserves battery life and signal integrity in always-on systems |
| JEDEC DO-214AB compliance | Standardized SMC footprint - enables drop-in replacement and automated assembly compatibility |
Applications
| Industrial Power Supply Input Protection | Telecom Line Card Surge Suppression |
|---|---|
Use Scenario: 48 V DC input stage of DIN-rail mounted PLC power modules exposed to lightning-induced surges on long cable runs. IC Role / Device Role / Timing Role: Bidirectional voltage clamp placed across input terminals to limit transient overvoltage to <60 V during IEC 61000-4-5 Level 4 (4 kV) events. Use Value: Prevents damage to upstream rectifiers and downstream DC-DC controllers by clamping within 5 ns while sustaining 500 A peak current without degradation. | Use Scenario: Protection of Ethernet PHY interface power pins (3.3 V/5 V) on carrier-grade line cards subjected to EFT bursts per IEC 61000-4-4. IC Role / Device Role / Timing Role: Fast-response TVS connected between VDD and GND to absorb repetitive 5 kHz burst transients up to ±4 kV. Use Value: Maintains <1 μA leakage at 85 °C ambient, avoiding false resets or brownouts in thermally dense chassis environments. |
| Automotive Body Control Module (BCM) Power Rail | Renewable Energy Inverter DC Link Protection |
Use Scenario: 12 V battery-supplied BCM microcontroller power rail subject to load-dump and ISO 7637-2 pulses. IC Role / Device Role / Timing Role: Primary clamping device across main 12 V input, coordinated with upstream fuse and secondary LC filter. Use Value: Withstands 150 °C junction temperature and delivers 410 A surge current at full thermal rating-critical for under-hood placement near engine compartments. | Use Scenario: DC link protection in solar string inverters where PV array inputs experience rapid polarity reversals and lightning surges. IC Role / Device Role / Timing Role: Bidirectional TVS placed across DC+ and DC− bus to clamp differential-mode transients per IEC 61000-4-5 Level 2 (1 kV, 500 A). Use Value: Symmetrical VBR (±36.7 V) ensures identical clamping behavior regardless of bus polarity inversion, eliminating need for dual unidirectional devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar TVS diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ33CA | Higher clamping voltage (71.4 V at 500 A), larger SMB package (DO-214AA), lower thermal rating (Tj max = 150 °C but Rth(j-a) = 110 °C/W) | Less effective for space-constrained designs requiring low VCL and high power density | Choose when cost sensitivity outweighs clamping performance and board area constraints |
| SMCJ33CA | Same SMC package, but higher VBR (36.7–40.6 V same), identical VCL (59 V), slightly higher IRM (1 μA @ 25 °C vs. 0.2 μA) | Acceptable for less sensitive analog or digital rails where ultra-low leakage is non-critical | Prefer when legacy design uses SMCJ series and minor leakage increase is acceptable |
Compared with SMBJ33CA and SMCJ33CA, the STIEC45-33ACS offers superior clamping precision (lower RD), tighter leakage control, and better thermal dissipation in the same SMC footprint-making it optimal for high-reliability, thermally demanding DC power protection.
Availability
STIEC45-33ACS is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and renewable energy inverters requiring stable component supply, long-term lifecycle support, and RoHS2-compliant surge protection.
Supply support for STIEC45-33ACS 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 protection ICs 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-emphasizing low clamping voltage, thermal resilience, and bidirectional symmetry.
FAQ
What is the maximum clamping voltage of STIEC45-33ACS at 500 A (8/20 μs)?
The maximum clamping voltage is 59 V at 500 A (8/20 μs) pulse, measured at 25 °C ambient. This value is guaranteed per Table 4 in the datasheet and reflects worst-case VCL under standardized surge conditions, enabling accurate overvoltage margining for protected downstream components.
Does STIEC45-33ACS support bidirectional surge suppression?
Yes-it is a fully bidirectional TVS diode with symmetrical breakdown characteristics: VBR min = 36.7 V, typ = 38.6 V, max = 40.6 V in both polarities. Clamping initiates at VBR in either direction, making it suitable for floating DC rails, AC-coupled interfaces, and polarity-agnostic protection schemes.
What is the thermal resistance from junction to leads (Rth(j-l)) for STIEC45-33ACS?
Rth(j-l) is 15 °C/W, as specified in Table 3 of the datasheet. This low value enables efficient heat transfer from the silicon die to PCB copper through the leads, supporting sustained high-current surge handling and extended reliability in thermally constrained layouts.
Is STIEC45-33ACS compliant with IEC 61000-4-2 ESD testing?
Yes-it complies with IEC 61000-4-2 Level 4: 15 kV air discharge and 8 kV contact discharge. This certification is explicitly stated in the "Complies with the following standards" section of the datasheet and validated per MIL-STD-883 Method 3015-7 (25 kV HBM), confirming robust electrostatic immunity.
STIEC45-33ACS 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):
- 33V
- Voltage - Breakdown (Min):
- 36.7V
- Voltage - Clamping (Max) @ Ipp:
- 59V
- 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
STIEC45-33ACS FAQ
1.How can I place an order for STIEC45-33ACS through Aetrix?
Please submit a Request for Quotation (RFQ) for STIEC45-33ACS 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 STIEC45-33ACS reliable?
The price and inventory of STIEC45-33ACS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STIEC45-33ACS is usually 5 days.
3.What payment methods are accepted for STIEC45-33ACS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STIEC45-33ACS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STIEC45-33ACS?
STIEC45-33ACS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STIEC45-33ACS 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 STIEC45-33ACS?
For technical support, including STIEC45-33ACS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STIEC45-33ACS requirements.
6.How does Aetrix verify that STIEC45-33ACS is sourced from the original manufacturer or authorized distributors?
All STIEC45-33ACS 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 STIEC45-33ACS meets industry standards.
7.What is the process for return or replacement of STIEC45-33ACS?
All STIEC45-33ACS units undergo pre-shipment inspection (PSI). If there is an issue with STIEC45-33ACS, 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 STIEC45-33ACS part is unused and in its original packaging.
Return procedure for STIEC45-33ACS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STIEC45-33ACS Tags
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