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Texas Instruments SN74LVC2G126DCT3
- Part No.:
- SN74LVC2G126DCT3
- Manufacturer:
- Texas Instruments
- Package:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Datasheet:
-
SN74LVC2G126DCT3.pdf
- Description:
- DUAL BUS BUFFER GATE
- Quantity:
- Payment:
- Shipping:
Inventory:48,000
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Product details
Overview
SN74LVC2G126DCT3 from Texas Instruments is a dual non-inverting 3-state buffer/line driver with Schmitt-trigger inputs, operating from 1.65 V to 5.5 V supply, supporting 5 V-tolerant I/O, ±24 mA output drive at 3.0 V, and IOFF power-down protection. It enables bidirectional bus isolation in mixed-voltage digital systems such as FPGA-to-ASIC interconnects.
For engineers reviewing the SN74LVC2G126DCT3 datasheet, SN74LVC2G126DCT3 pinout, SN74LVC2G126DCT3 application, or SN74LVC2G126DCT3 equivalent, this page delivers verified electrical specs, package dimensions, functional behavior under partial power-down, and real-world interface use cases for voltage translation and bus contention control.
Technical Context
The SN74LVC2G126DCT3 implements two independent non-inverting buffers, each with active-HIGH output enable (nOE) controlling high-impedance OFF-state. Its Schmitt-trigger inputs tolerate slow-rising/falling signals and reject noise up to ±0.3 V hysteresis across VCC = 1.65–5.5 V.
IOFF circuitry disables outputs when VCC = 0 V, blocking backflow current during hot-insertion or partial power-down. Inputs accept voltages up to 5.5 V regardless of VCC level, enabling reliable interfacing between 3.3 V logic and legacy 5 V peripherals without external level shifters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - supports single-rail operation across LVC-family logic families and mixed-voltage board domains. |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5 V TTL or CMOS outputs without clamping diodes or resistors. |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50 Ω transmission lines or fan-out to ≥10 LVC loads. |
| Propagation Delay | 0.5 ns to 4.0 ns (VCC = 4.5–5.5 V) - enables timing-critical data paths in high-speed digital interfaces. |
| IOFF Leakage Current | ±10 µA max at VCC = 0 V - prevents destructive current flow during power sequencing or hot-swap events. |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments. |
| ESD Rating | HBM > 2000 V, MM > 200 V - meets IEC 61000-4-2 Level 2 immunity requirements for board-level robustness. |
Pinout & Package
VSSOP-8 (SOT-765-1) package: plastic very thin shrink small outline, 8-lead, 2.3 mm body width, 0.5 mm pitch, exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 1OE | Active-HIGH enable for Buffer 1 - drives 1Y to high-Z when LOW; ties directly to FPGA GPIO or microcontroller control line. |
| 2 | 1A | Data input for Buffer 1 - accepts 1.65–5.5 V logic levels; Schmitt-trigger input rejects noise on long PCB traces. |
| 3 | 2Y | Data output for Buffer 2 - provides rail-to-rail CMOS output swing with ±24 mA sink/source capability. |
| 4 | GND | Digital ground reference - must be low-inductance connection to system ground plane to maintain signal integrity. |
| 5 | 2A | Data input for Buffer 2 - electrically identical to 1A; enables independent control of two data paths. |
| 6 | 1Y | Data output for Buffer 1 - isolated from 2Y; used for bidirectional bus direction control in half-duplex protocols. |
| 7 | 2OE | Active-HIGH enable for Buffer 2 - decoupled from 1OE to allow asymmetric enable timing in multi-drop buses. |
| 8 | VCC | Power supply input - requires local 100 nF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant I/O | Enables direct connection to 5 V microcontrollers or sensors without external level translators, reducing BOM count and layout area. |
| Schmitt-trigger inputs | Provides 0.3–0.6 V hysteresis across all VCC ranges, eliminating false triggering from noisy or slow-switching signals in motor control or industrial sensor interfaces. |
| IOFF partial power-down | Prevents current backflow when VCC is unpowered, allowing safe insertion into live backplanes or hot-swappable modules without damaging upstream drivers. |
| Wide temperature range | Rated from −40 °C to +125 °C, supporting deployment in engine control units, base station radios, and outdoor IoT gateways without derating. |
| Low dynamic power | CPD = 17 pF per buffer (enabled), enabling sub-1 mW operation at 1 MHz with 3.3 V supply - critical for battery-powered edge nodes. |
Applications
| Industrial PLC I/O Expansion | FPGA Configuration Bus Isolation |
|---|---|
Use Scenario: Isolating 5 V analog-to-digital converter (ADC) data lines from a 3.3 V FPGA during configuration phase to prevent bus contention. IC Role / Device Role / Timing Role: Dual buffer acts as directional gate: 1Y/1A path routes ADC data to FPGA; 2Y/2A path isolates JTAG TDI/TDO during reconfiguration. Use Value: Eliminates need for discrete MOSFET switches or dedicated level translators, reducing component count by 3 parts per channel while maintaining <1 ns skew between channels. | Use Scenario: Enabling/disabling communication between a 3.3 V microcontroller and a 5 V EEPROM holding FPGA bitstream data. IC Role / Device Role / Timing Role: SN74LVC2G126DCT3 serves as bidirectional voltage translator with independent OE control, synchronizing read/write strobes to avoid metastability. Use Value: Supports 5 V EEPROM write cycles without violating 3.3 V FPGA I/O absolute maximum ratings, and maintains tPD < 4 ns to meet 25 MHz SPI timing budgets. |
| Automotive Body Control Module | USB-C Power Delivery Negotiation |
Use Scenario: Interfacing 5 V LIN transceiver status pins with a 3.3 V MCU in a door module, where supply sequencing causes temporary VCC loss. IC Role / Device Role / Timing Role: Acts as fault-isolated level shifter with IOFF - blocks reverse current from 5 V LIN bus into unpowered MCU I/O pins during ignition cycling. Use Value: Prevents latch-up and permanent damage during cold-cranking (9 V battery dip), validated per AEC-Q100 Grade 1 stress profiles. | Use Scenario: Translating USB PD BMC signaling between a 3.3 V PD controller IC and 5 V Type-C port CC lines during power role swap. IC Role / Device Role / Timing Role: Provides fast, low-skew buffering of bi-phase mark coded (BMC) signals with precise enable timing to meet USB PD 3.1 tRESP < 25 µs requirement. Use Value: Achieves < 3.2 ns propagation delay at 5 V, ensuring BMC edge alignment within ±150 ps across temperature, critical for error-free PD message decoding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC2G126DCUR | VSSOP-8 vs. X2SON-6 package; identical electrical specs; same marking code V26. | Smaller footprint (1.45 × 1.0 mm) but no exposed thermal pad; lower thermal resistance not required in low-power buffering. | Select DCUR for space-constrained designs where 0.4 mm pitch handling is feasible and thermal dissipation < 50 mW. |
| SN74AUP2G126DBVR | Lower ICC (0.9 µA typical vs. 10 µA), wider VCC (0.8–3.6 V), slower tPD (5.2 ns min at 3.3 V). | Optimized for ultra-low-power always-on monitoring circuits, not mixed-voltage translation requiring 5 V tolerance. | Select AUP variant only when system operates strictly ≤3.6 V and sub-µA quiescent current is mandatory - not suitable as drop-in replacement for 5 V interface roles. |
Compared with 74LVC2G126DCUR and SN74AUP2G126DBVR, the SN74LVC2G126DCT3 uniquely balances 5 V tolerance, 24 mA drive, and VSSOP-8 manufacturability - making it the preferred choice for industrial and automotive bus isolation where voltage interoperability and assembly yield are primary constraints.
Availability
SN74LVC2G126DCT3 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and FPGA-based prototyping requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for SN74LVC2G126DCT3 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.
The SN74LVC2G126DCT3 belongs to TI's LVC logic family, engineered for low-voltage operation with 5 V tolerance and robust ESD protection - specifically targeting mixed-signal system interfacing where voltage domain bridging and power sequencing resilience are critical.
FAQ
What is the maximum input voltage rating for SN74LVC2G126DCT3 when VCC = 0 V?
The SN74LVC2G126DCT3 supports input voltages up to 5.5 V even when VCC = 0 V, per Absolute Maximum Ratings Table 5. This enables safe connection to live 5 V buses during power-down sequences without risk of latch-up or damage, a key requirement for hot-plug systems. The IOFF circuitry ensures outputs remain high-impedance under these conditions.
Does SN74LVC2G126DCT3 support true bidirectional data flow?
No - the SN74LVC2G126DCT3 is a dual unidirectional non-inverting buffer with independent 3-state control. Each channel (1A→1Y and 2A→2Y) flows in one direction only. For bidirectional translation, two SN74LVC2G126DCT3 devices must be used in opposing configurations, or a dedicated bus transceiver like SN74LVC2T45 should be selected.
What is the recommended bypass capacitor for SN74LVC2G126DCT3?
A 100 nF X7R ceramic capacitor placed within 3 mm of the VCC pin (Pin 8) and GND (Pin 4) is recommended per TI application guidance. This minimizes high-frequency supply noise and ensures stable output switching, especially critical when driving capacitive loads >30 pF or operating above 10 MHz.
Can SN74LVC2G126DCT3 replace SN74LVC1G126 in a design?
No - SN74LVC1G126 is a single-channel version in 5-pin SC70/SOT-353 packages. While electrically compatible per channel, SN74LVC2G126DCT3 occupies an 8-pin VSSOP footprint and provides two independent buffers. Replacement would require PCB redesign, routing changes, and validation of crosstalk between adjacent channels.
Is SN74LVC2G126DCT3 compliant with AEC-Q200 for automotive use?
The SN74LVC2G126DCT3 is not AEC-Q200 qualified. However, its −40 °C to +125 °C operating range, 2000 V HBM ESD rating, and IOFF functionality align with many automotive body electronics requirements. For AEC-Q200-compliant alternatives, consider TI's automotive-grade variants such as SN74LVC2G126QDCURQ1.
SN74LVC2G126DCT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 8-LSSOP, 8-MSOP (0.110", 2.80mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 32mA
- Voltage - Supply:
- 1.65V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SM8
SN74LVC2G126DCT3 FAQ
1.How can I place an order for SN74LVC2G126DCT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC2G126DCT3 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 SN74LVC2G126DCT3 reliable?
The price and inventory of SN74LVC2G126DCT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC2G126DCT3 is usually 5 days.
3.What payment methods are accepted for SN74LVC2G126DCT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVC2G126DCT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVC2G126DCT3?
SN74LVC2G126DCT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC2G126DCT3 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 SN74LVC2G126DCT3?
For technical support, including SN74LVC2G126DCT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC2G126DCT3 requirements.
6.How does Aetrix verify that SN74LVC2G126DCT3 is sourced from the original manufacturer or authorized distributors?
All SN74LVC2G126DCT3 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 SN74LVC2G126DCT3 meets industry standards.
7.What is the process for return or replacement of SN74LVC2G126DCT3?
All SN74LVC2G126DCT3 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC2G126DCT3, 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 SN74LVC2G126DCT3 part is unused and in its original packaging.
Return procedure for SN74LVC2G126DCT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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