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Texas Instruments SN74LVC126APWT
- Part No.:
- SN74LVC126APWT
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74LVC126APWT.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,575
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Product details
Overview
SN74LVC126APWT from Texas Instruments is a quadruple 3-state bus buffer gate operating from 1.65V to 3.6V VCC, featuring independent OE-controlled outputs, 5.5V-tolerant inputs, and 4.7ns maximum propagation delay at 3.3V. It serves as a level-translating buffer in mixed-voltage digital interfaces such as MCU-to-peripheral data buses in consumer audio and display systems.
For engineers reviewing the SN74LVC126APWT datasheet, SN74LVC126APWT pinout, SN74LVC126APWT application, or SN74LVC126APWT equivalent, key selection criteria include 3-state timing (ten/tdis), input overvoltage tolerance, thermal performance in TSSOP-14, and compatibility with 1.8V/2.5V/3.3V logic families in space-constrained designs.
Technical Context
The SN74LVC126APWT implements four identical non-inverting buffers, each with dedicated output-enable (OE) control enabling independent tri-state operation. Its CMOS design supports rail-to-rail output swing (VOL ≤ 0.8V, VOH ≥ VCC–0.3V) across –40°C to +125°C while maintaining 24mA drive capability per output at 3V.
Input voltage tolerance up to 5.5V allows direct interfacing with legacy 5V logic without external level shifters, and its low dynamic power dissipation (Cpd = 4pF at 3.3V, outputs disabled) supports high-density PCB layouts in portable electronics where supply noise and thermal management are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65V to 3.6V - Enables interoperability across 1.8V, 2.5V, and 3.3V logic domains without voltage translation circuitry. |
| Input Voltage Tolerance | Up to 5.5V - Permits direct connection to 5V sources in mixed-supply systems, eliminating external clamping or translators. |
| tpd (max) | 4.7ns at 3.3V - Supports signal integrity in high-speed digital paths up to ~100MHz clock-equivalent rates. |
| IOL / IOH (max) | 24mA at VCC = 3V - Drives multiple CMOS inputs or moderate capacitive loads without external buffering. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature consumer applications including AV receivers and SSDs. |
| Cpd (disabled) | 4pF at 3.3V - Minimizes switching current and supply noise when outputs are tri-stated, improving system-level EMI performance. |
Pinout & Package
TSSOP-14 (PW) package: 5.00mm × 4.40mm body size, 14-pin surface-mount with exposed thermal pad connected to GND for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low enable inputs - Each controls one buffer's output state independently; must be pulled low via resistor during power-up to ensure Hi-Z default. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - Accept 5.5V-tolerant signals; compatible with 1.65V–3.6V VCC and upstream 5V logic. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Non-inverting buffered outputs - Tri-state capable; drive strength and VOL/VOH specified per load and VCC. |
| 7 | GND | Ground reference - Connects to PCB ground plane; thermal pad must be soldered to internal GND for thermal compliance. |
| 14 | VCC | Supply pin - Requires local 0.1µF bypass capacitor placed adjacent to pin; supports 1.65V–3.6V operation. |
Key Features
| Feature | Design Value |
|---|---|
| 5.5V-tolerant inputs | Enables seamless integration into mixed-voltage systems without external level-shifting components. |
| Independent 3-state control | Four separate OE pins allow selective bus isolation-critical for multi-master or shared-bus architectures. |
| High-speed propagation | 4.7ns max tpd at 3.3V ensures minimal latency in time-critical data path buffering. |
| Industrial temperature range | –40°C to +125°C operation supports deployment in automotive infotainment, industrial SSDs, and networked AV equipment. |
| Low dynamic power | 4pF Cpd (outputs disabled) reduces switching current and improves power integrity in battery-powered devices. |
Applications
| AV Receivers | Blu-ray Players and Home Theaters |
|---|---|
Use Scenario: Buffering HDMI CEC or SPDIF control signals between microcontroller and audio/video subsystems. IC Role / Device Role / Timing Role: Level-translating bus buffer isolating 3.3V MCU I/O from 5V legacy peripheral interfaces. Use Value: Eliminates need for discrete level shifters while maintaining signal integrity and timing margins under varying load conditions. | Use Scenario: Driving parallel control buses for disc drive motor controllers and video decoder ICs. IC Role / Device Role / Timing Role: High-drive (24mA) non-inverting buffer enabling fan-out to multiple downstream logic inputs. Use Value: Ensures reliable signal transmission across PCB traces with up to 20pF capacitance without waveform degradation. |
| Solid State Drives (SSDs) | TVs: LCD, Digital, and HDTV |
Use Scenario: Isolating host interface signals (e.g., SATA LED indicators or thermal sensor alerts) from main controller bus. IC Role / Device Role / Timing Role: Tri-state buffer enabling dynamic bus sharing between host and embedded flash controller. Use Value: Prevents contention during hot-plug events and supports fail-safe status reporting under full thermal stress (125°C). | Use Scenario: Routing EDID or DDC communication lines between HDMI source and display panel controller. IC Role / Device Role / Timing Role: Low-capacitance (7pF Co), fast-response buffer preserving I²C timing compliance. Use Value: Maintains sub-μs rise/fall times required for 400kHz I²C Fast Mode+ while rejecting crosstalk in dense video board layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125APWT | Quad buffer with active-high OE (vs. active-low OE in SN74LVC126APWT); otherwise identical electrical specs. | Requires inverted OE logic in control firmware or external inverter; unsuitable where OE polarity is fixed by system architecture. | Select SN74LVC125APWT only if active-high enable simplifies system-level timing or eliminates need for OE inversion logic. |
| 74LVC126PW,118 (Nexperia) | Pin-compatible TSSOP-14 variant; same VCC range and 5.5V-tolerant inputs, but tpd = 5.2ns (max) at 3.3V and lower drive (24mA not guaranteed over full temp range). | Marginally slower timing and reduced thermal robustness limit use in high-reliability industrial SSDs or automotive-grade AV receivers. | Accept 74LVC126PW,118 for cost-sensitive consumer audio docks where 125°C operation and <4.7ns tpd are not required. |
Compared with SN74LVC125APWT and 74LVC126PW,118, the SN74LVC126APWT offers guaranteed active-low OE polarity, tighter 4.7ns tpd spec across temperature, and full 24mA drive validated to +125°C-making it optimal for thermally demanding, timing-critical bus isolation in premium AV and storage systems.
Availability
SN74LVC126APWT is available at Aetrix Electronics and suitable for AV receivers, solid-state drives (SSDs), and high-definition TVs requiring stable component supply, long-term manufacturability, and RoHS-compliant TSSOP packaging.
Supply support for SN74LVC126APWT 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 leader specializing in analog and embedded processing technologies, with decades of expertise in logic, power management, and signal chain solutions.
The SN74LVC126APWT belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, high-speed, mixed-voltage interfacing in portable, industrial, and consumer electronics.
FAQ
What is the maximum recommended operating voltage for SN74LVC126APWT?
The SN74LVC126APWT has an absolute maximum VCC rating of 6.5V, but its recommended operating range is strictly 1.65V to 3.6V. Operating outside this window may cause functional failure or accelerated wear. Inputs tolerate up to 5.5V regardless of VCC, making SN74LVC126APWT suitable for down-translation from 5V logic into 3.3V or 2.5V domains.
How does the SN74LVC126APWT handle power-up sequencing?
To ensure outputs remain in high-impedance during power-up, each OE pin of the SN74LVC126APWT must be tied to GND through a pulldown resistor. TI specifies no minimum resistance value, but typical values range from 1kΩ to 10kΩ depending on driver strength. This prevents bus contention before firmware initializes OE states, a critical requirement in systems with shared data buses.
Can SN74LVC126APWT drive a 50pF load at 100MHz?
The SN74LVC126APWT is characterized for 50pF loads in timing tests (e.g., tpd, ten, tdis), and its 24mA drive strength supports clean edges into such loads at frequencies up to ~100MHz. However, signal integrity depends on PCB layout: controlled impedance routing, minimized stub length, and proper termination are essential. The SN74LVC126APWT itself meets timing specs under these conditions per TI's parameter measurement guidelines.
Is thermal pad connection mandatory for SN74LVC126APWT in TSSOP-14?
Yes-the exposed thermal pad on the SN74LVC126APWT (PW package) must be soldered to a PCB ground plane using multiple vias. TI documentation explicitly states that correct operation requires this connection for both thermal performance and electrical stability. Omitting it risks exceeding junction temperature limits, especially under sustained 24mA output loading at +125°C ambient.
What is the latch-up immunity rating of SN74LVC126APWT?
The SN74LVC126APWT exceeds 250mA latch-up immunity per JESD17, verified under worst-case conditions. This robustness enables reliable operation in electrically noisy environments such as AV receivers and home theater systems, where transient coupling or ESD events could otherwise trigger destructive parasitic SCR conduction. No external protection circuitry is required solely for latch-up prevention.
SN74LVC126APWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVC
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 4
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74LVC126APWT FAQ
1.How can I place an order for SN74LVC126APWT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVC126APWT 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 SN74LVC126APWT reliable?
The price and inventory of SN74LVC126APWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVC126APWT is usually 5 days.
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4.How is shipping managed for SN74LVC126APWT?
SN74LVC126APWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVC126APWT 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 SN74LVC126APWT?
For technical support, including SN74LVC126APWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVC126APWT requirements.
6.How does Aetrix verify that SN74LVC126APWT is sourced from the original manufacturer or authorized distributors?
All SN74LVC126APWT 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 SN74LVC126APWT meets industry standards.
7.What is the process for return or replacement of SN74LVC126APWT?
All SN74LVC126APWT units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVC126APWT, 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 SN74LVC126APWT part is unused and in its original packaging.
Return procedure for SN74LVC126APWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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