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Texas Instruments SN74AHC126NSR
- Part No.:
- SN74AHC126NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC126NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,913
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Product details
Overview
SN74AHC126NSR from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for digital signal routing and bus isolation in 2V–5.5V systems. It delivers 3.8 ns typical propagation delay at 5 V, supports ±25 mA output drive, and operates across –40°C to +85°C - enabling use in industrial control backplanes and mixed-voltage logic interfaces.
For engineers reviewing the SN74AHC126NSR datasheet, SN74AHC126NSR pinout, SN74AHC126NSR application, or SN74AHC126NSR equivalent, this page provides verified package mapping (SOP-14), functional truth table, thermal metrics (RθJA = 124.6°C/W), latch-up immunity (>250 mA), and ESD ratings (±2000 V HBM) directly extracted from TI's SCLS257N datasheet.
Technical Context
The SN74AHC126NSR implements four identical non-inverting buffer channels, each with separate active-low output enable (OE) control. Each channel follows Y = A logic under OE = LOW, entering high-impedance state when OE = HIGH - enabling bidirectional bus sharing without contention.
Its balanced CMOS 3-state outputs source/sink symmetric current (±25 mA), support 15 pF–50 pF load capacitance, and exhibit low dynamic noise (VOL(P) ≤ 0.8 V, VOH(V) ≥ 4.4 V at 5 V). Input transition rate must be ≤20 ns/V at 5 V to prevent oscillation or excessive power draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports interoperability between 2.5 V, 3.3 V, and 5 V logic domains without level shifters. |
| tPLH / tPHL (5 V) | 3.8 ns typical - enables reliable operation in 100+ MHz digital control paths with margin for trace delays. |
| IOL / IOH | ±8 mA at 5 V - drives standard TTL loads or multiple CMOS inputs while maintaining VOL ≤ 0.5 V and VOH ≥ 3.94 V. |
| Input Voltage Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - ensures noise margins >0.7 V in noisy industrial environments. |
| ESD Rating (HBM) | ±2000 V - meets IEC 61000-4-2 Level 2 for handling robustness during board assembly and field service. |
| Latch-up Immunity | >250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events on I/O lines. |
Pinout & Package
SOP-14 (NS) package: 14-pin plastic small-outline package, 5 mm × 6.4 mm body size, 5 mm × 4.4 mm footprint, RoHS-compliant, NIPDAU lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable input | Controls high-impedance state per channel; tie to GND via 10-kΩ pull-down for safe power-up behavior. |
| 1A–4A | Buffer input | CMOS-compatible input with VI = 0–5.5 V; unused inputs must be tied to VCC or GND to prevent floating-induced current. |
| 1Y–4Y | Non-inverting buffered output | 3-state output capable of sourcing/sinking ±25 mA; high-impedance state isolates bus segments during arbitration. |
| VCC (Pin 14) | Positive supply | Must be decoupled with 0.1 μF ceramic capacitor near pin; supplies all four buffers and OE logic. |
| GND (Pin 7) | Ground reference | Common return path for all I/O and supply currents; critical for noise suppression and switching integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent 3-state buffers | Enables discrete control of four signal paths - e.g., isolating sensor data, configuration lines, and status flags on shared buses. |
| Balanced output drive (±25 mA) | Eliminates need for external pull-ups/pull-downs in point-to-point connections and ensures clean edges into 50 Ω transmission lines. |
| Wide VCC range (2–5.5 V) | Permits single-component reuse across legacy 5 V, modern 3.3 V, and emerging 2.5 V subsystems without redesign. |
| Low propagation delay (3.8 ns typ @ 5 V) | Supports timing-critical applications such as real-time encoder interface or FPGA configuration handshaking. |
| High noise immunity (VIL = 1.65 V @ 5.5 V) | Guarantees reliable logic interpretation in electrically noisy factory-floor or motor-drive environments. |
Applications
| Industrial Backplane Interface | LED Status Bus Driver |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from a multi-drop RS-485 transceiver control bus with shared enable lines. IC Role / Device Role / Timing Role: Signal-level translator and bus contention guard - buffers MCU outputs while preventing backfeed during transceiver reset. Use Value: Eliminates risk of bus lockup during hot-plug events; enables deterministic startup sequencing without software intervention. |
Use Scenario: Driving 8-segment LED displays and bi-color status indicators from a low-current MCU port. IC Role / Device Role / Timing Role: Current-boosting buffer - converts weak GPIO outputs into 8 mA sink/source capability per segment. Use Value: Achieves uniform LED brightness without external transistors; reduces BOM count by 4× versus discrete transistor solutions. |
| Digital Test Fixture Signal Routing | Mixed-Voltage Logic Translation |
Use Scenario: Selectively connecting DUT signals to measurement instruments (oscilloscope, logic analyzer) in automated test equipment. IC Role / Device Role / Timing Role: Reconfigurable signal switch - enables software-controlled path selection without mechanical relays. Use Value: Reduces test fixture wear and improves repeatability; supports sub-10 ns edge fidelity required for high-speed digital validation. |
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripheral ICs (e.g., EEPROM, DAC) on the same PCB. IC Role / Device Role / Timing Role: Unidirectional voltage-tolerant buffer - accepts 5 V inputs safely while driving 3.3 V outputs. Use Value: Avoids dedicated level translators; leverages inherent 5.5 V input rating and 3.3 V compatible output swing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT126PW | CMOS input with TTL-compatible thresholds (VIH = 2.0 V min); otherwise identical pinout, timing, and drive. | Better suited for interfacing with older 5 V TTL logic families where input noise margins are marginal. | Select when driving from legacy 74LS/74F sources; avoid if only CMOS inputs are present. |
| 74LVC126APW | Lower VCC range (1.65–3.6 V); 3.3 V optimized; 5 V tolerant inputs; slightly higher tPD (4.2 ns @ 3.3 V). | Designed for battery-powered or ultra-low-power systems requiring sub-2 V operation and smaller quiescent current. | Prefer for portable instrumentation or IoT edge nodes; not suitable for 5 V-only systems. |
Compared with SN74AHC126NSR, SN74AHCT126PW offers improved compatibility with TTL signaling but lacks 2 V minimum VCC support, while 74LVC126APW enables lower-voltage operation at the cost of reduced 5 V system interoperability and slightly slower switching.
Availability
SN74AHC126NSR is available at Aetrix Electronics and suitable for industrial automation, test equipment, and embedded control applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for SN74AHC126NSR 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability silicon and design resources.
The SN74AHC126NSR belongs to TI's AHC logic family - engineered for low-power, high-speed CMOS buffering in mixed-voltage digital systems where signal integrity and bus isolation are critical.
FAQ
What is the maximum operating temperature for SN74AHC126NSR?
The SN74AHC126NSR is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade temperature range is validated per TI's SCLS257N datasheet and applies to the SOP-14 (NS) package variant. Thermal derating is not required within this range when mounted on standard FR-4 PCBs with recommended copper pour and decoupling.
Does SN74AHC126NSR support 5 V tolerant inputs?
Yes, SN74AHC126NSR supports input voltages up to 5.5 V regardless of VCC level - confirmed in Section 5.3 (Recommended Operating Conditions) of the TI datasheet. This allows safe interfacing with 5 V signals even when powered from 3.3 V or 2.5 V supplies, eliminating external clamping diodes.
Can SN74AHC126NSR drive a 50 Ω transmission line directly?
Yes - SN74AHC126NSR delivers ±8 mA output drive at 5 V, sufficient to drive 50 Ω lines to full logic levels (VOL ≤ 0.5 V, VOH ≥ 3.94 V). However, trace impedance matching and termination strategy must still be implemented externally to suppress reflections, as the device itself does not include on-die termination.
What is the recommended pull-down resistor value for OE pins on SN74AHC126NSR?
Texas Instruments recommends a 10-kΩ pull-down resistor on each OE pin to ensure defined low state during power-up or brownout conditions. This value balances leakage current minimization (<0.5 μA), noise immunity, and fast enable response - as documented in Section 3 (Description) and Section 7.3.1 of the SN74AHC126NSR datasheet.
Is SN74AHC126NSR pin-compatible with other packages in the same family?
Yes - SN74AHC126NSR (SOP-14) shares identical pin numbering and function mapping with SN74AHC126DR (SOIC-14), SN74AHC126PWR (TSSOP-14), and SN74AHC126DBR (SSOP-14), per TI's Pin Configuration and Functions table (Figure 4-1). Mechanical dimensions differ, but PCB layout can be reused with land pattern adaptation.
SN74AHC126NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74AHC126NSR FAQ
1.How can I place an order for SN74AHC126NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC126NSR 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 SN74AHC126NSR reliable?
The price and inventory of SN74AHC126NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC126NSR is usually 5 days.
3.What payment methods are accepted for SN74AHC126NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC126NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC126NSR?
SN74AHC126NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC126NSR 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 SN74AHC126NSR?
For technical support, including SN74AHC126NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC126NSR requirements.
6.How does Aetrix verify that SN74AHC126NSR is sourced from the original manufacturer or authorized distributors?
All SN74AHC126NSR 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 SN74AHC126NSR meets industry standards.
7.What is the process for return or replacement of SN74AHC126NSR?
All SN74AHC126NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC126NSR, 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 SN74AHC126NSR part is unused and in its original packaging.
Return procedure for SN74AHC126NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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