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Semtech Corporation TCLAMP1282S.TCT
- Part No.:
- TCLAMP1282S.TCT
- Manufacturer:
- Semtech Corporation
- Category:
- TVS Diodes
- Package:
- SOT-23-6
- Datasheet:
-
TCLAMP1282S.TCT.pdf
- Description:
- TVS DIODE 8VWM 9.5VC SOT23-6L
- Quantity:
- Payment:
- Shipping:
Inventory:2,960
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Product details
Overview
TClamp1282S.TCT from Semtech is a low-capacitance TransClamp® TVS diode array designed for secondary surge and ESD protection of G.Fast and DSL line drivers. It features 12V reverse stand-off voltage, ≤2.5pF junction capacitance, 30A (8/20µs) surge current rating, ±30kV IEC 61000-4-2 ESD immunity, and operates in SOT-23-6L package for ADSL/VDSL/G.Fast interface protection.
For engineers reviewing the TClamp1282S.TCT datasheet, pinout, applications, or equivalent options, this device delivers verified clamping voltage of 9.5V at 30A, bias-enabled low-signal-distortion protection, and flow-through PCB routing compatibility for differential DSL signal integrity.
Technical Context
The TClamp1282S.TCT integrates steering diodes with a snap-back (crow-bar) silicon-avalanche TVS to achieve low clamping voltage (9.5V) under 30A surge while maintaining ≤2.5pF capacitance between pins 1–3. Its internal biased bridge structure prevents transient charging of TVS capacitance during signal transmission.
It supports dual-voltage configurations: pin 5 accepts positive bias (e.g., +12V), pin 2 connects to GND for single-ended G.Fast CPE or to negative bias for VDSL Class-H dual-rail operation. Capacitance variation is limited to 0.15pF across 1V–12V reverse voltage range, ensuring stable high-frequency signal fidelity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reverse Stand-Off Voltage | 12V - Maximum continuous operating voltage before conduction begins; defines safe working margin for 12Vpp DSL signals. |
| Clamping Voltage | 9.5V at 30A (8/20µs) - Peak voltage seen by protected circuit during worst-case lightning surge; ensures downstream driver ICs remain within safe SOA. |
| Junction Capacitance | ≤2.5pF (VR = 0V, 1MHz) - Minimizes signal attenuation and phase distortion on high-speed DSL/G.Fast lines up to 212 MHz. |
| ESD Immunity | ±30kV contact per IEC 61000-4-2 - Withstands repeated human-body-model ESD events without degradation, critical for field-deployed CPE. |
| Surge Rating | 30A (8/20µs) per IEC 61000-4-5 - Handles induced lightning surges when paired with upstream 220V GDT primary protection. |
| Capacitance Variation | 0.15pF (1V–12V) - Ensures consistent impedance matching and return loss across full operating voltage swing. |
Pinout & Package
Package: JEDEC-standard SOT-23-6L, Pb-free matte tin finish, UL 94V-0 molding compound, tape-and-reel (3000 pcs/reel). Flow-through layout enables symmetrical differential trace routing under the device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Line 1A (I/O) | Differential signal input/output terminal for Line 1; connects directly to line driver output or twisted-pair cable. |
| Pin 2 | GND / Negative Bias | Ground reference for single-ended use; connects to negative supply rail (e.g., –12V) in dual-voltage VDSL configurations. |
| Pin 3 | Line 1B (I/O) | Complementary differential signal terminal; maintains matched path length and impedance with Pin 1. |
| Pin 4 | No Connect | Internally unconnected; no PCB trace or solder required. |
| Pin 5 | +Bias Input | Accepts external positive bias voltage (e.g., +12V) to pre-charge TVS capacitance and eliminate signal settling distortion. |
| Pin 6 | No Connect | Internally unconnected; allows uninterrupted trace routing beneath device for layout symmetry. |
Key Features
| Feature | Design Value |
|---|---|
| Bias-enabled low-distortion protection | Internal bridge + external +bias (Pin 5) eliminates initial TVS capacitance charging transients, preserving G.Fast symbol timing accuracy. |
| Snap-back crow-bar clamping | Activates low-impedance conduction state after breakdown, delivering 9.5V clamping at 30A-lower than standard avalanche TVS devices. |
| Flow-through SOT-23-6L layout | Pins 1 and 3 aligned linearly with Pins 4 and 6 unused, enabling straight-through differential trace routing and minimizing stub effects. |
| Ultra-low capacitance stability | ≤2.5pF max with only 0.15pF variation from 1V–12V reverse bias-critical for maintaining >40dB return loss in 106MHz+ G.Fast bands. |
Applications
| G.Fast Customer Premise Equipment | VDSL2 Class-H Line Drivers |
|---|---|
Use Scenario: Indoor G.Fast modem deployed in residential environments subject to ESD handling and induced surges. IC Role / Device Role / Timing Role: Secondary protection device placed between line driver IC and RJ-11 jack, clamping transients before they reach sensitive analog front-end. Use Value: 9.5V clamping voltage ensures line driver remains within absolute maximum ratings during 30A lightning surges, preventing latch-up or permanent damage. | Use Scenario: Central office VDSL2 line card supporting Class-H power amplifiers with ±12V rails. IC Role / Device Role / Timing Role: Dual-rail transient suppressor with Pin 2 connected to –12V and Pin 5 to +12V, protecting both polarities of differential pair. Use Value: Symmetrical biasing enables balanced clamping response on both signal polarities, maintaining common-mode rejection ratio (CMRR) >60dB. |
| ADSL/VDSL Modems | DSL Access Multiplexers |
Use Scenario: Low-cost ADSL2+ modem requiring robust ESD immunity for retail distribution. IC Role / Device Role / Timing Role: ESD and EFT suppressor on telephone line interface, compliant with IEC 61000-4-2 (±30kV) and IEC 61000-4-4 (2kV). Use Value: 2.5pF capacitance avoids signal attenuation in 2.2MHz ADSL band, preserving SNR and enabling higher bit-loading per tone. | Use Scenario: Carrier-grade DSLAM line card exposed to long-loop surges and AC power induction per ITU-T K.20/K.21. IC Role / Device Role / Timing Role: Secondary surge protector coordinated with 220V GDT primary stage to meet ITU-T K.44 lightning immunity requirements. Use Value: 30A (8/20µs) surge rating ensures survivability after upstream GDT fires, maintaining service continuity during multi-event storm conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SP1015-01WTG | Lower 12V VRWM but higher 15pF capacitance; uses polymer-based TVS, not silicon-avalanche snap-back. | Targeted at lower-speed Ethernet/USB; lacks DSL-specific bias architecture and flow-through layout. | Not suitable for G.Fast >106MHz due to excessive capacitance-induced insertion loss. |
| SRV05-4 | 5V VRWM, 3-channel array, 30pF typical capacitance; no bias pins or snap-back clamping. | Designed for USB 2.0/3.0 and HDMI; no support for DSL line driver secondary protection topology. | Cannot replace TClamp1282S.TCT in DSL applications-clamping voltage too high and capacitance incompatible with >1MHz signaling. |
Compared with SP1015-01WTG and SRV05-4, the TClamp1282S.TCT uniquely combines 12V standoff, 9.5V clamping, sub-2.5pF capacitance, and dedicated bias pins-enabling distortion-free protection for G.Fast and VDSL2 Class-H line drivers where signal integrity and surge robustness are co-constrained.
Availability
TClamp1282S.TCT is available at Aetrix Electronics and suitable for G.Fast modems, VDSL2 line drivers, and DSL access multiplexers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for TClamp1282S.TCT 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
Semtech Corporation is a U.S.-based fabless semiconductor company specializing in high-performance analog and mixed-signal ICs for precision sensing, protection, and signal integrity.
The TClamp® product line is engineered specifically for secondary surge and ESD protection of high-speed wired communication interfaces-including G.Fast, VDSL2, and ADSL-where ultra-low capacitance and controlled clamping behavior are mandatory.
FAQ
What is the clamping voltage specification for TClamp1282S.TCT under IEC 61000-4-5 surge conditions?
The TClamp1282S.TCT delivers a guaranteed clamping voltage of 9.5V when subjected to a 30A, 8/20µs surge waveform per IEC 61000-4-5. This value is measured across pins 1–3 using a 1.2/50µs voltage–8/20µs current combination waveform with 2Ω source impedance, confirming its ability to protect downstream line drivers without exceeding their absolute maximum ratings.
How does the bias functionality of TClamp1282S.TCT improve signal integrity in G.Fast applications?
The TClamp1282S.TCT uses an internal biased bridge structure where external +12V applied to Pin 5 pre-charges the TVS capacitance, eliminating transient charging distortion during signal startup. This ensures clean symbol timing and minimal inter-symbol interference in G.Fast systems operating up to 212 MHz-directly enabled by the TClamp1282S.TCT's design.
Can TClamp1282S.TCT be used in dual-voltage VDSL2 Class-H configurations?
Yes-the TClamp1282S.TCT supports dual-voltage operation: Pin 5 accepts +12V bias while Pin 2 connects to –12V (not GND), enabling symmetrical clamping on both polarities of the differential line pair. This configuration is validated in Figure 4 of the official datasheet and is essential for VDSL2 Class-H line driver protection.
What is the maximum junction capacitance of TClamp1282S.TCT and at what test condition is it specified?
The maximum junction capacitance of TClamp1282S.TCT is 2.5pF, measured between pins 1 and 3 at 0V reverse bias and 1MHz frequency (T = 25°C). This ultra-low value-combined with only 0.15pF variation from 1V to 12V-is critical for preserving signal integrity in high-bandwidth DSL and G.Fast interfaces.
Is TClamp1282S.TCT compatible with automated SMT assembly processes?
Yes-TClamp1282S.TCT is packaged in JEDEC-standard SOT-23-6L with matte tin lead finish and RoHS/WEEE compliance. Its land pattern (Page 10 of datasheet) supports standard reflow profiles, and the tape-and-reel format (3000 pcs/reel) is fully compatible with pick-and-place equipment used in high-volume modem and DSLAM manufacturing.
TCLAMP1282S.TCT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Semtech Corporation
- Package/Case:
- SOT-23-6
- Series:
- TClamp®
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 8V
- Voltage - Breakdown (Min):
- 13.5V
- Voltage - Clamping (Max) @ Ipp:
- 9.5V (Typ)
- Current - Peak Pulse (10/1000µs):
- 30A (8/20µs)
- Power - Peak Pulse:
- 300W
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- 1.2pF @ 1MHz
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TCLAMP1282S.TCT FAQ
1.How can I place an order for TCLAMP1282S.TCT through Aetrix?
Please submit a Request for Quotation (RFQ) for TCLAMP1282S.TCT 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 TCLAMP1282S.TCT reliable?
The price and inventory of TCLAMP1282S.TCT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TCLAMP1282S.TCT is usually 5 days.
3.What payment methods are accepted for TCLAMP1282S.TCT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TCLAMP1282S.TCT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TCLAMP1282S.TCT?
TCLAMP1282S.TCT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TCLAMP1282S.TCT 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 TCLAMP1282S.TCT?
For technical support, including TCLAMP1282S.TCT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TCLAMP1282S.TCT requirements.
6.How does Aetrix verify that TCLAMP1282S.TCT is sourced from the original manufacturer or authorized distributors?
All TCLAMP1282S.TCT 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 TCLAMP1282S.TCT meets industry standards.
7.What is the process for return or replacement of TCLAMP1282S.TCT?
All TCLAMP1282S.TCT units undergo pre-shipment inspection (PSI). If there is an issue with TCLAMP1282S.TCT, 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 TCLAMP1282S.TCT part is unused and in its original packaging.
Return procedure for TCLAMP1282S.TCT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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