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Texas Instruments SN74LVTH126D
- Part No.:
- SN74LVTH126D
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVTH126D.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:710
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Product details
Overview
SN74LVTH126D from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-mode 3.3-V VCC operation with 5-V tolerant inputs and outputs, supporting hot insertion, bus-hold on all data inputs, and operation down to 2.7 V. It delivers 64 mA sink current per output at 3 V, features <0.8 V typical output ground bounce (VOLP), and is used in voltage-level translation between 3.3-V logic and legacy 5-V backplanes or I/O subsystems.
For engineers reviewing the SN74LVTH126D datasheet, SN74LVTH126D pinout, SN74LVTH126D application, or SN74LVTH126D equivalent, key selection criteria include its Ioff-enabled hot-swap capability, bus-hold elimination of external pull resistors, guaranteed 2.7–3.6 V supply range, and SOIC-14 package compatibility with industrial control and telecom interface boards requiring robust signal integrity and power sequencing resilience.
Technical Context
This device implements four independent noninverting buffers, each with an active-high output-enable (OE) control input that places the corresponding Y output in high-impedance state when low. The bus-hold circuitry actively maintains valid logic levels on undriven A inputs without external components, drawing ±500 µA max dynamic hold current at 3.6 V.
It integrates dual protection mechanisms for hot insertion: Ioff disables outputs during power-down to prevent backflow current, while power-up 3-state ensures outputs remain high-Z until VCC exceeds 1.5 V. Absolute maximum ratings permit 7-V input/output tolerance under clamp-current limits, and latch-up performance exceeds 100 mA per JESD 78 Class II.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Ensures stable operation across unregulated battery supplies and noisy 3.3-V rails. |
| IOL (max) | 64 mA at VCC = 3 V - Supports driving heavy capacitive loads or multiple TTL inputs without external buffering. |
| tPLH/tPHL | 2.3 ns typical at VCC = 3.3 V - Enables use in high-speed address/data bus applications up to ~200 MHz toggle rate. |
| VIH/VIL | 2.0 V / 0.8 V - Compatible with both 3.3-V LVTTL and 5-V TTL logic thresholds for seamless level translation. |
| Bus-Hold Current | ±500 µA max at VCC = 3.6 V - Provides sufficient overdrive margin to reliably switch held inputs in noisy environments. |
| θJA | 86°C/W (SOIC-D) - Allows thermal design margin up to ~70 mW dissipation at 85°C ambient without heatsinking. |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - Meets industrial-grade ESD robustness requirements without external protection. |
Pinout & Package
SN74LVTH126D uses a 14-pin SOIC (D) package with 1.27-mm lead pitch, 8.75-mm body width, and 1.75-mm max height per JEDEC MS-012AB. Pin 1 is marked by a beveled corner or index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output-Enable (OE) | Active-high control for corresponding buffer; drives Y high-Z when low - enables independent bus segment gating. |
| 2, 5, 9, 12 | Data Input (A) | Noninverting input with integrated bus-hold - eliminates need for external pullup/pulldown on unused lines. |
| 3, 6, 8, 11 | Buffer Output (Y) | 3-state CMOS output capable of sinking 64 mA or sourcing 32 mA - interfaces directly to 5-V TTL loads. |
| 7 | GND | Ground reference for all I/O and internal circuitry - must be low-inductance connection to minimize VOLP. |
| 14 | VCC | 3.3-V supply input - supports down to 2.7 V for brownout tolerance; decoupling capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V-tolerant inputs/outputs with 3.3-V VCC - enables direct interfacing between 3.3-V microcontrollers and 5-V peripherals without level shifters. |
| Ioff and power-up 3-state | Prevents backflow current during hot insertion and forces high-Z on power ramp - eliminates bus contention during board replacement. |
| Bus-hold on all data inputs | Actively holds floating A inputs at valid logic levels - removes requirement for 10-kΩ external bias resistors and saves PCB space. |
| Low output ground bounce | <0.8 V typical VOLP at 3.3 V - reduces noise coupling into adjacent signals and improves timing margin in dense routing. |
| Latch-up immunity | Exceeds 100 mA per JESD 78 Class II - ensures reliability in systems exposed to transient overvoltage or ESD events. |
Applications
| Industrial Backplane Interface | Hot-Swappable Module Control |
|---|---|
Use Scenario: Interfacing a 3.3-V FPGA I/O bank to a legacy 5-V VMEbus or CompactPCI backplane with shared address/data lines. IC Role / Device Role / Timing Role: Quad noninverting buffer providing bidirectional level translation and bus isolation via OE-controlled 3-state outputs. Use Value: Eliminates discrete level-shifter ICs and external pull resistors while maintaining signal integrity across 100+ mm trace lengths. |
Use Scenario: Enabling safe insertion/removal of mezzanine cards in telecom line cards powered by a common 3.3-V rail. IC Role / Device Role / Timing Role: Hot-insertion–qualified buffer isolating card-local logic from backplane signals during power sequencing. Use Value: Ioff prevents current backflow into powered-down modules; power-up 3-state avoids bus conflicts during staggered power application. |
| Embedded Controller I/O Expansion | Test Equipment Signal Conditioning |
Use Scenario: Extending GPIO count of an ARM Cortex-M4 MCU to drive multiple 5-V sensors and actuators in factory automation PLCs. IC Role / Device Role / Timing Role: Level-translating buffer with bus-hold ensuring defined states on unconnected sensor inputs during firmware updates. Use Value: Reduces firmware complexity by eliminating input state polling; ±500 µA bus-hold current sustains logic levels despite EMI-induced glitches. |
Use Scenario: Conditioning digital trigger and clock signals in automated test equipment where DUT I/O voltages vary between 3.3 V and 5 V. IC Role / Device Role / Timing Role: Low-skew, low-ground-bounce buffer isolating sensitive measurement circuitry from noisy DUT switching transients. Use Value: 2.3 ns typical propagation delay and <0.8 V VOLP preserve edge fidelity and reduce jitter in time-critical trigger paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126A | No bus-hold; lower drive strength (24 mA sink); 1.65–3.6 V VCC range. | Requires external pull resistors on unused inputs; unsuitable for true hot-swap due to missing Ioff. | Select when cost sensitivity outweighs bus-hold and hot-swap needs, and system operates strictly within 1.65–3.6 V. |
| SN74AHCT125 | 5-V-only supply; TTL-compatible inputs; no bus-hold or Ioff; higher propagation delay (8 ns). | Cannot interface 3.3-V controllers directly; requires separate 5-V rail and external biasing for floating inputs. | Choose only in pure 5-V systems where legacy AHCT speed/power trade-offs are acceptable and hot-swap is not required. |
Compared with SN74LVC126A and SN74AHCT125, SN74LVTH126D uniquely combines 5-V-tolerant I/O, integrated bus-hold, Ioff-enabled hot insertion, and 2.7–3.6 V operation - making it the sole option among these three for robust mixed-voltage backplane interfacing without external support components.
Availability
SN74LVTH126D is available at Aetrix Electronics and suitable for industrial backplane interfaces, hot-swappable module control, and embedded controller I/O expansion requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for SN74LVTH126D 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, embedded processing, and connectivity technologies with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH126D belongs to TI's LVT (Low-Voltage TTL) logic family, engineered specifically for mixed-voltage system interfacing where 3.3-V logic must reliably communicate with 5-V infrastructure without external level-shifting components.
FAQ
What is the minimum VCC required for functional operation of the SN74LVTH126D?
The SN74LVTH126D is fully specified from 2.7 V to 3.6 V. Below 2.7 V, parameters such as tPLH, VOH, and IOL are not guaranteed. At VCC < 1.5 V, outputs enter high-impedance regardless of OE state - but reliable logic operation requires VCC ≥ 2.7 V per recommended operating conditions in the SN74LVTH126D datasheet.
Does the SN74LVTH126D require external pullup or pulldown resistors on its A inputs?
No. The SN74LVTH126D integrates active bus-hold circuitry on all four A inputs, which maintains a valid logic state on undriven or floating inputs. TI explicitly states that using external pullup or pulldown resistors with the bus-hold circuitry is not recommended, as they may interfere with the internal hold function and increase power consumption.
Can the SN74LVTH126D safely interface a 3.3-V microcontroller GPIO to a 5-V display module?
Yes. The SN74LVTH126D supports 5-V-tolerant inputs and outputs while operating from a 3.3-V supply. Its VI rating extends to 7 V, and it delivers 64 mA sink current per output - sufficient to drive standard 5-V LCD or LED display control lines directly, provided OE is asserted and layout minimizes ground bounce.
How does the SN74LVTH126D support hot insertion in modular systems?
The SN74LVTH126D supports hot insertion through two complementary features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging backflow current, and power-up 3-state holds outputs in high-impedance until VCC exceeds 1.5 V. Together, these ensure no bus contention or latch-up occurs during live module insertion into a powered backplane - a core requirement validated in the SN74LVTH126D characterization.
What is the thermal resistance (θJA) of the SN74LVTH126D in its SOIC-14 package?
The SN74LVTH126D in the SOIC (D) package has a junction-to-ambient thermal resistance (θJA) of 86°C/W, measured per JESD 51-7 on a standard 2-layer JEDEC test board. This value assumes no copper pour or thermal vias; actual board-level θJA will improve with proper thermal land design and airflow, enabling continuous operation at up to ~70 mW dissipation at 85°C ambient.
SN74LVTH126D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVTH126D FAQ
1.How can I place an order for SN74LVTH126D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH126D 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 SN74LVTH126D reliable?
The price and inventory of SN74LVTH126D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH126D is usually 5 days.
3.What payment methods are accepted for SN74LVTH126D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH126D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH126D?
SN74LVTH126D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH126D 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 SN74LVTH126D?
For technical support, including SN74LVTH126D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH126D requirements.
6.How does Aetrix verify that SN74LVTH126D is sourced from the original manufacturer or authorized distributors?
All SN74LVTH126D 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 SN74LVTH126D meets industry standards.
7.What is the process for return or replacement of SN74LVTH126D?
All SN74LVTH126D units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH126D, 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 SN74LVTH126D part is unused and in its original packaging.
Return procedure for SN74LVTH126D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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