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Texas Instruments SN74AHCT126DGVR
- Part No.:
- SN74AHCT126DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT126DGVR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,671
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Product details
Overview
SN74AHCT126DGVR from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional data bus isolation and level translation between 3.3 V and 5 V logic domains. It features TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, 7 ns typical propagation delay at 5 V/15 pF, and operates across –40°C to 125°C.
For engineers reviewing the SN74AHCT126DGVR datasheet, SN74AHCT126DGVR pinout, SN74AHCT126DGVR application, or SN74AHCT126DGVR equivalent, key selection criteria include 3-state bus control timing, input voltage compatibility with legacy TTL, thermal performance in TVSOP-14 packaging, and ESD robustness for industrial board-level integration.
Technical Context
The SN74AHCT126DGVR implements four independent noninverting buffers, each with dedicated output-enable (OE) control. Each channel transitions to high-impedance when its OE is low, enabling clean bus sharing without contention. Its CMOS output stage delivers balanced rise/fall times and reduced ringing-critical for noise-sensitive interfaces in dense PCB layouts.
Input thresholds are optimized for TTL-voltage compatibility, allowing direct connection to 3.3 V microcontrollers while driving 5 V bus loads. The device uses standard AHCT logic family characteristics: 5 V nominal supply, rail-to-rail output swing, and guaranteed operation down to 4.5 V under industrial temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures stable operation with standard 5 V rails and tolerates ±5% regulation drift |
| Propagation Delay | 1 ns to 7 ns (CL = 15 pF) - enables sub-100 MHz bus switching with predictable timing margins |
| Output Drive | ±8 mA - sufficient for driving multiple CMOS/TTL loads without external buffering |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - guarantees reliable recognition of 3.3 V logic levels on 5 V-supplied device |
| ESD Rating | 2000 V HBM - meets IEC 61000-4-2 Level 2 for board-level handling robustness |
| Operating Temperature | –40°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
| Quiescent Current | 20 µA max - supports low-power standby states in always-on systems |
Pinout & Package
SN74AHCT126DGVR is housed in a 14-pin Thin Very Small Outline Package (TVSOP), measuring 3.6 mm × 3.0 mm × 1.05 mm (DGV package code), with gull-wing leads and 0.5 mm pitch. This RoHS-compliant, surface-mount package supports automated assembly and offers improved thermal resistance (RθJA = 129.0°C/W) versus standard SOIC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (1OE, 2OE, 3OE, 4OE) | Active-high control per channel; drives associated Y output to high-Z when low |
| 2, 5, 9, 12 | Input (1A, 2A, 3A, 4A) | TTL-compatible digital input; accepts 0–5.5 V, referenced to VCC |
| 3, 6, 8, 11 | Output (1Y, 2Y, 3Y, 4Y) | Noninverting buffered output; sinks or sources up to 8 mA, rail-to-rail swing |
| 7 | GND | Ground reference for all logic and power domains; must be low-impedance |
| 14 | VCC | 5 V supply pin; requires local 0.1 µF bypass capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | Enables direct interface with legacy 3.3 V microcontrollers and FPGAs without level shifters |
| Independent 3-state control | Four separate OE pins allow granular bus arbitration and prevent contention in multi-master systems |
| Slow-edge optimization | Controlled slew rate minimizes overshoot/undershoot on PCB traces, reducing EMI in high-density layouts |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC, supporting mixed-voltage system debugging and hot-swap scenarios |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against transient current faults in industrial environments |
Applications
| Server Backplane Interface | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Isolating control signals between 3.3 V FPGA configuration logic and 5 V backplane transceivers in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-lane 3-state enable, synchronizing signal integrity across voltage domains. Use Value: Eliminates need for discrete level translators; 7 ns tPLH/tPHL ensures setup/hold compliance with PCIe Gen1 clocking. |
Use Scenario: Driving LED status indicators and opto-isolated relay drivers from a 3.3 V ARM Cortex-M4 controller in modular PLC chassis. IC Role / Device Role / Timing Role: Low-drive buffer with TTL-compatible inputs, providing fault-isolated output staging before power-stage drivers. Use Value: ±8 mA drive sustains LED brightness across temperature; 125°C rating matches industrial ambient requirements. |
| Network Switch ASIC Interface | Wearable Health Sensor Hub |
|
Use Scenario: Buffering address/data lines between 5 V Ethernet PHY registers and 3.3 V switch fabric ASIC in managed gigabit switches. IC Role / Device Role / Timing Role: Quad-channel bus isolator with independent OE control, enabling dynamic bus partitioning during link renegotiation. Use Value: 15 pF load timing specs align with IEEE 802.3 MII timing budgets; TVSOP footprint saves board space in 1U designs. |
Use Scenario: Interfacing low-power biosensor ADCs (3.3 V) with legacy 5 V display controllers in compact wearable fitness bands. IC Role / Device Role / Timing Role: Voltage-translating buffer with ultra-low ICC (20 µA), minimizing quiescent current in battery-operated mode. Use Value: 0.5 mm pitch TVSOP enables routing in <10 mm² PCB area; 2000 V HBM protects against ESD during user handling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125DGVR | Quad buffer with active-low OE (1E, 2E, 3E, 4E) instead of active-high OE | Requires inverted enable logic; unsuitable where upstream control signals are active-high | Select only if system enable signals match active-low polarity and timing budget allows identical propagation delay |
| SN74LVC126APWR | 3.3 V-only supply (1.65–3.6 V); LVCMOS input thresholds; 24 mA drive | Cannot translate 3.3 V → 5 V; incompatible with 5 V bus loads or legacy TTL inputs | Prefer for pure 3.3 V systems requiring higher drive; avoid when interfacing to 5 V peripherals or TTL logic |
Compared with SN74AHCT126DGVR, SN74AHCT125DGVR demands enable signal inversion and lacks drop-in compatibility, while SN74LVC126APWR sacrifices 5 V tolerance and TTL compatibility for lower voltage operation and higher drive-making SN74AHCT126DGVR the sole choice for mixed 3.3 V/5 V bus translation with industrial temperature support.
Availability
SN74AHCT126DGVR is available at Aetrix Electronics and suitable for server backplanes, industrial PLC I/O modules, and network switch ASIC interfaces requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant TVSOP packaging.
Supply support for SN74AHCT126DGVR 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 logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
SN74AHCT126DGVR belongs to TI's AHCT logic family-engineered for robust 5 V TTL-compatible interfacing in harsh environments, emphasizing noise immunity, wide temperature range, and bus-contention-safe 3-state operation.
FAQ
What is the maximum operating temperature for SN74AHCT126DGVR?
The SN74AHCT126DGVR is rated for continuous operation from –40°C to +125°C, making it suitable for under-hood automotive modules, industrial motor drives, and telecom infrastructure equipment where ambient temperatures exceed standard commercial limits. This rating is verified per JEDEC JESD22-A108 and applies to the DGV package variant specifically.
Does SN74AHCT126DGVR support 3.3 V input signals when powered by 5 V?
Yes, SN74AHCT126DGVR accepts 3.3 V logic levels directly: its VIH threshold is 2.0 V and VIL is 0.8 V at VCC = 5 V, ensuring reliable detection of 3.3 V high/low states. Inputs tolerate up to 5.5 V regardless of supply, enabling safe interfacing with 3.3 V microcontrollers without external level-shifting circuitry.
What is the recommended bypass capacitor for SN74AHCT126DGVR?
A 0.1 µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) and GND (Pin 7) is required for stable operation. For systems with multiple SN74AHCT126DGVR devices or high-frequency noise, paralleling a 1 µF capacitor improves low-frequency decoupling-TI's layout guidelines specify ≤2 mm trace length between capacitor pads and IC pins.
Can SN74AHCT126DGVR drive a 50 pF load within timing specifications?
Yes, SN74AHCT126DGVR maintains guaranteed timing with CL = 50 pF: tPLH/tPHL is 1 ns to 9.5 ns, and tPZH/tPHZ is 1 ns to 11 ns at VCC = 5 V. These values are specified across –40°C to +125°C and ensure reliable operation in FR4 PCBs with moderate trace capacitance and stub loading.
Is SN74AHCT126DGVR pin-compatible with other AHCT126 variants in TVSOP?
Yes, SN74AHCT126DGVR shares identical pinout and footprint with all TVSOP-packaged AHCT126 devices (e.g., SN74AHCT126DBR, SN74AHCT126PWR), including matching 14-pin arrangement, pad dimensions, and thermal pad absence. Mechanical compatibility is confirmed in TI's DGV package drawing SLMS125C.
SN74AHCT126DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TFSOP (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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TVSOP
SN74AHCT126DGVR FAQ
1.How can I place an order for SN74AHCT126DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT126DGVR 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 SN74AHCT126DGVR reliable?
The price and inventory of SN74AHCT126DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT126DGVR is usually 5 days.
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SN74AHCT126DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT126DGVR 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 SN74AHCT126DGVR?
For technical support, including SN74AHCT126DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT126DGVR requirements.
6.How does Aetrix verify that SN74AHCT126DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT126DGVR 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 SN74AHCT126DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHCT126DGVR?
All SN74AHCT126DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT126DGVR, 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 SN74AHCT126DGVR part is unused and in its original packaging.
Return procedure for SN74AHCT126DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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