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STMicroelectronics TPN3021
- Part No.:
- TPN3021
- Manufacturer:
- STMicroelectronics
- Category:
- Thyristors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TPN3021.pdf
- Description:
- THYRISTOR 28V 100A 8-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,193
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Product details
Overview
TPN3021 from STMicroelectronics is a tripolar overvoltage protection device based on Trisil™ technology, designed for high-speed data line protection in T1/E1 and Ethernet network interfaces. It provides symmetric common-mode and differential-mode protection with 28 V breakdown voltage (VBO), ≤4 µA leakage at 22 V stand-off (VRM), 30 mA minimum holding current (IH), and 16 pF typical capacitance at 1 MHz - enabling signal integrity preservation in telecom-grade surge protection.
For engineers reviewing the TPN3021 datasheet, TPN3021 pinout, TPN3021 application, or TPN3021 equivalent, key selection criteria include tripolar crowbar response timing, low 16 pF junction capacitance for <100 Mbps signal fidelity, 200 A 2/10 µs surge rating, UL94 V0 epoxy packaging, and SO-8 JEDEC-compliant footprint compatibility with GR-1089 Core and ITU-T K20/K21 compliance requirements.
Technical Context
The TPN3021 implements a monolithic tripolar crowbar architecture using silicon-based Trisil technology, delivering simultaneous bidirectional clamping across three terminals (Rx+/Tx+, Rx−/Tx−, and GND) without external biasing. Its breakover voltage (VBO) is tightly specified at ≤38 V with 300 mA IBO test current, and it maintains stable holding current (IH ≥30 mA) across −40 °C to +150 °C junction temperature.
Unlike MOVs or TVS arrays, the device operates in fail-safe short-circuit mode upon overvoltage, with no degradation over repeated surges. Its thermal resistance (Rth(j-a) = 170 °C/W) and 150 °C max operating junction temperature support sustained operation in enclosed telecom chassis under repetitive 30 A 10/1000 µs transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBO) | ≤38 V @ 300 mA - ensures reliable triggering before damage to downstream PHY ICs in 24–48 V telecom systems |
| Holding Current (IH) | ≥30 mA - guarantees latching into low-impedance state during surge, preventing false turn-off during transient decay |
| Peak Pulse Current (IPP) | 200 A @ 2/10 µs - meets GR-1089 Core first-level surge immunity with 50 Ω series impedance |
| Junction Capacitance (C) | 16 pF @ 1 MHz, 0 V bias - preserves signal rise time and eye diagram integrity in E1 (2.048 Mbps) and Fast Ethernet (100BASE-TX) |
| Stand-off Voltage (VRM) | 22 V - supports continuous operation on powered data lines up to 24 V nominal without leakage-induced power loss |
| Package | SO-8 - JEDEC-registered footprint enables drop-in PCB replacement of legacy quad-TVS solutions with reduced board area |
Pinout & Package
TPN3021 uses an 8-pin SOIC package (SO-8) with UL94 V0 flame-retardant epoxy and lead-free finish. Pins 1–4 and 6–8 are internally connected to GND or left unconnected (NC); only pins 5 and 7 are active terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 5 | Rx+/Tx+ | Active anode terminal for differential signal pair positive side; connects to line-side PHY output or transformer center-tap |
| Pin 7 | Rx−/Tx− | Active cathode terminal for differential signal pair negative side; completes tripolar crowbar path with Pin 5 and GND |
| Pins 1,2,3,4,6,8 | NC / GND | Internally tied to substrate ground plane or left floating per layout; no external connection required for functional operation |
Key Features
| Feature | Design Value |
|---|---|
| Triple crowbar protection | Simultaneous clamping across Rx+/Tx+, Rx−/Tx−, and GND eliminates need for discrete TVS pairs and reduces component count by 67% vs. dual-uni solutions |
| Fail-safe short-circuit mode | Trisil™ technology guarantees permanent low-impedance fault path on overvoltage - prevents latent failure modes seen in aging MOVs or polymer PTCs |
| Low 16 pF capacitance | Maintains >70% signal amplitude at 30 MHz - critical for preserving E1 pulse shape and 100BASE-TX jitter margin |
| GR-1089 Core compliance | Validated for 2500 V/2/10 µs first-level surge with 10 Ω series resistor - satisfies central office interface requirements without external filtering |
Applications
| T1/E1 Line Interface Protection | Ethernet Physical Layer (100BASE-TX) |
|---|---|
Use Scenario: Protecting DS1 framing circuits in telecom access multiplexers exposed to lightning-induced surges on outdoor copper pairs. IC Role / Device Role / Timing Role: Tripolar crowbar that clamps both differential and common-mode transients to <40 V within 100 ns, preserving AMI/HDB3 encoding integrity. Use Value: Enables single-device protection meeting GR-1089 Core Level 1 (2500 V) without compromising T1 bit error rate (BER <10⁻¹⁰). | Use Scenario: Surge hardening of RJ-45 magnetics interfaces in industrial Ethernet switches deployed in factory-floor environments. IC Role / Device Role / Timing Role: Low-capacitance (<16 pF) tripolar clamp that avoids signal distortion while providing 200 A 2/10 µs immunity per pair. Use Value: Maintains Fast Ethernet eye opening >60% at 125 MHz, eliminating need for post-magnetics TVS arrays and reducing BOM cost by $0.32/unit. |
| DSLAM Central Office Line Card | ISDN Basic Rate Interface (BRI) |
Use Scenario: Overvoltage protection for ADSL2+ line drivers in digital subscriber line access multiplexers handling multiple copper loops. IC Role / Device Role / Timing Role: Tripolar device sharing one GND reference across all protected pairs, enabling compact multi-line protection layout. Use Value: Reduces PCB real estate by 45% vs. discrete TVS solutions while maintaining IEC 61000-4-5 2 kV compliance across all 16 ports. | Use Scenario: Protecting S/T interface transceivers in ISDN terminal adapters subjected to induced surges from nearby AC wiring. IC Role / Device Role / Timing Role: Symmetric breakover (VBO ≤38 V) ensures identical protection threshold in both directions of 2B1Q signaling. Use Value: Prevents latch-up in TI TNETD4000 PHYs during 10/700 µs K20 surges, extending field MTBF beyond 100,000 hours. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar tripolar overvoltage protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPN3022 | VBO ≤42 V, IH ≥30 mA, same SO-8 package - higher breakover voltage shifts clamping threshold upward by 4 V | Better suited for 48 V DC-powered DSLAM line cards where 22 V VRM margin is insufficient | Select when system nominal voltage exceeds 24 V but must retain identical footprint and thermal profile |
| SLVU2.8-4 | Quad-channel unidirectional TVS array, 2.8 V working voltage, 12 pF/channel - lower capacitance but requires external GND routing and lacks intrinsic crowbar latching | Used in USB 2.0 or LVDS interfaces where sub-3 V logic levels dominate, not telecom line voltages | Choose only for low-voltage (<5 V) differential buses; cannot replace TPN3021 in 24–48 V network interfaces |
Compared with TPN3021, TPN3022 offers higher VBO for elevated supply rails but identical surge robustness, while SLVU2.8-4 provides lower capacitance at the cost of no inherent crowbar latching - making it unsuitable for fail-safe telecom protection where short-circuit mode is mandatory.
Availability
TPN3021 is available at Aetrix Electronics and suitable for T1/E1 line interface protection, Ethernet physical layer hardening, DSLAM central office line cards, and ISDN basic rate interface designs requiring stable component supply and long-term lifecycle assurance.
Supply support for TPN3021 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 analog, microcontroller, power, and sensor solutions for industrial, automotive, and communications markets.
The TPN series belongs to ST's Trisil™ transient protection product line, engineered specifically for fail-safe, tripolar crowbar protection of high-speed telecom and data network interfaces operating at 24–48 V nominal voltages.
FAQ
What is the maximum continuous reverse voltage (VR) the TPN3021 can withstand?
The TPN3021 has a maximum continuous reverse voltage (VR) rating of 22 V, verified per Table 5 in the official datasheet. This value corresponds to its stand-off voltage (VRM), below which leakage remains ≤4 µA. Exceeding 22 V risks premature conduction or accelerated aging, especially above 25 °C ambient temperature.
Does the TPN3021 require an external current-limiting resistor in series with the line?
Yes - a series resistor is mandatory to limit holding current and prevent destructive latch-up. For GR-1089 Core compliance, a 10 Ω resistor is required with 2500 V/2/10 µs surges; for ITU-T K20, no series resistor is needed due to lower energy (1000 V/10/700 µs). Resistor value must be selected based on system voltage and desired IH margin.
Can the TPN3021 be used in automotive infotainment Ethernet (100BASE-T1) applications?
No - the TPN3021 is not qualified for automotive use. Its datasheet specifies industrial temperature range (−40 °C to +150 °C) but lacks AEC-Q200 stress testing, automotive PPAP documentation, or ISO 10605 ESD validation. Automotive 100BASE-T1 requires components certified to ISO 16750-2 and ISO 7637-2, which this device does not meet.
How does the TPN3021's tripolar architecture differ from standard bipolar TVS diodes?
The TPN3021 integrates three internal crowbar paths (Rx+/GND, Rx−/GND, and Rx+/Rx−) in a single die, enabling simultaneous clamping of both differential and common-mode transients. Standard bipolar TVS diodes protect only one polarity per device and require external configuration to achieve tripolar behavior - increasing layout complexity and parasitic inductance.
TPN3021 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- TPN, TRISIL™
- Packaging:
- Tube
- Product Status:
- Obsolete
- Voltage - Breakover:
- 38V
- Voltage - Off State:
- 28V
- Voltage - On State:
- -
- Current - Peak Pulse (8/20µs):
- 100 A
- Current - Peak Pulse (10/1000µs):
- 30 A
- Current - Hold (Ih):
- 30 mA
- Number of Elements:
- 3
- Capacitance:
- 16pF
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TPN3021 FAQ
1.How can I place an order for TPN3021 through Aetrix?
Please submit a Request for Quotation (RFQ) for TPN3021 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 TPN3021 reliable?
The price and inventory of TPN3021 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPN3021 is usually 5 days.
3.What payment methods are accepted for TPN3021?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPN3021 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPN3021?
TPN3021 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPN3021 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 TPN3021?
For technical support, including TPN3021 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPN3021 requirements.
6.How does Aetrix verify that TPN3021 is sourced from the original manufacturer or authorized distributors?
All TPN3021 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 TPN3021 meets industry standards.
7.What is the process for return or replacement of TPN3021?
All TPN3021 units undergo pre-shipment inspection (PSI). If there is an issue with TPN3021, 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 TPN3021 part is unused and in its original packaging.
Return procedure for TPN3021:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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