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Texas Instruments SN74AHC126NS
- Part No.:
- SN74AHC126NS
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74AHC126NS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:10,500
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Product details
Overview
SN74AHC126NS from Texas Instruments is a quad non-inverting buffer/line driver with 3-state outputs, designed for bus interface and signal isolation in digital systems. It features active-HIGH output enable inputs, CMOS-level input compatibility (VCC = 2.0–5.5 V), propagation delay as low as 3.3 ns at 5 V/15 pF, and operates across −40 °C to +125 °C. It is used in microcontroller peripheral expansion, memory address buffering, and logic level translation.
For engineers reviewing the SN74AHC126NS datasheet, SN74AHC126NS pinout, SN74AHC126NS application, or SN74AHC126NS equivalent, key selection criteria include its 3-state drive capability, Schmitt-trigger input hysteresis, ±25 mA output current rating, rail-to-rail output swing, and SO-14 package compatibility with legacy LSTTL systems.
Technical Context
The SN74AHC126NS implements four independent non-inverting buffers, each with an active-HIGH output enable (nOE) controlling high-impedance (Z) state on the corresponding nY output. Its CMOS silicon-gate process ensures balanced tPLH/tPHL propagation delays and supports mixed-voltage interfacing via input tolerance up to 7.0 V - exceeding VCC.
Each input incorporates Schmitt-trigger action for noise immunity on slow or noisy signals, and all I/O pins feature ESD protection per HBM (>2000 V), MM (>200 V), and CDM (>1000 V) standards. The device complies with JEDEC Std 7-A and is functionally identical to SN74AHC125 except for active-HIGH enable polarity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 2.0 V to 5.5 V - supports 2.5 V, 3.3 V, and 5 V logic domains without level shifters |
| Propagation Delay (tpd) | 3.3 ns typical at VCC = 5 V, CL = 15 pF - enables high-speed bus driving up to ~100 MHz |
| Output Drive (IO) | ±25 mA - sufficient to drive 50 Ω transmission lines or multiple TTL loads |
| Input Thresholds | VIH = 3.85 V, VIL = 1.65 V at VCC = 5.5 V - CMOS-compatible thresholds ensure clean logic recognition |
| ESD Protection | HBM >2000 V - meets industrial-grade robustness requirements for board-level handling |
| Operating Temperature | −40 °C to +125 °C - qualified for automotive under-hood and industrial control environments |
| Power Dissipation Cap | 500 mW max - allows sustained operation in compact SO-14 packages with minimal thermal derating |
Pinout & Package
SN74AHC126NS is supplied in a plastic small outline package (SO-14) with 14 leads and 3.9 mm body width (JEDEC MS-012, NXP SOT108-1). Pin 1 is marked by a notch or index area; the package is lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (nOE) | Output Enable Input | Active-HIGH control per channel - drives corresponding nY into high-Z when LOW |
| 2, 5, 9, 12 (nA) | Data Input | Non-inverting input with Schmitt-trigger hysteresis - rejects noise on slow-rising/falling edges |
| 3, 6, 8, 11 (nY) | Data Output | 3-state buffered output - sinks or sources up to ±25 mA with rail-to-rail swing |
| 7 (GND) | Ground Reference | 0 V return path for all internal circuitry and I/O - must be low-impedance for signal integrity |
| 14 (VCC) | Supply Voltage | Primary power rail - decoupling capacitor (0.1 µF) required within 1 cm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Balanced Propagation Delays | tPLH and tPHL match within 0.5 ns - eliminates duty-cycle distortion in clock/data paths |
| Schmitt-Trigger Inputs | Hysteresis ≥0.5 V at VCC = 5 V - suppresses chatter from mechanical switches or unterminated traces |
| Over-Voltage Tolerant Inputs | Accepts VI up to 7.0 V regardless of VCC - enables safe interfacing with higher-voltage sensors or legacy buses |
| 3-State Output Control | Four independent nOE pins - permits dynamic bus arbitration and multi-driver contention management |
| Wide Temperature Range | Specified from −40 °C to +125 °C - validated for extended life in thermally stressed embedded applications |
Applications
| Industrial PLC I/O Expansion | Microcontroller GPIO Multiplexing |
|---|---|
Use Scenario: Isolating and buffering digital I/O signals between a programmable logic controller CPU and field-mounted sensors/actuators operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: SN74AHC126NS acts as a direction-controlled signal repeater, enabling bidirectional data flow while preventing back-driving between mismatched voltage domains. Use Value: Its Schmitt-trigger inputs reject EMI-induced glitches, and 3-state outputs allow shared bus access among multiple modules without hardware contention. | Use Scenario: Expanding limited GPIO count on an ARM Cortex-M4 MCU by connecting parallel peripherals (e.g., ADCs, DACs, LED drivers) to a common data bus. IC Role / Device Role / Timing Role: SN74AHC126NS serves as a controlled buffer stage, isolating MCU pins from capacitive loading and enabling time-multiplexed peripheral access. Use Value: With 3.3 ns propagation delay and ±25 mA drive strength, it maintains signal integrity across 10+ cm PCB traces while supporting 20+ MHz data rates. |
| Memory Address Latching | Legacy TTL Bus Interface |
Use Scenario: Driving address lines to external SRAM or Flash memory in a resource-constrained embedded system where timing margins are tight. IC Role / Device Role / Timing Role: SN74AHC126NS functions as a low-skew address buffer, ensuring simultaneous arrival of address bits at memory inputs to meet setup/hold windows. Use Value: Balanced tPLH/tPHL (≤0.3 ns skew) and 10 pF input capacitance minimize address decode jitter and reduce timing uncertainty. | Use Scenario: Interfacing modern 3.3 V microcontrollers with legacy 5 V LSTTL-based peripheral cards (e.g., ISA-bus add-ons) requiring level translation and drive strength matching. IC Role / Device Role / Timing Role: SN74AHC126NS provides pin-compatible replacement for 74LS126, delivering TTL-level output swing while accepting 3.3 V CMOS inputs. Use Value: Its 5.5 V-tolerant inputs eliminate external level shifters, and 25 mA sink capability matches LS-TTL fan-out requirements without pull-up resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer/line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT126NS | TTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V); otherwise identical pinout, timing, and drive | Required when driving from 5 V TTL or LSTTL sources; not suitable for pure CMOS systems below 4.5 V | Select SN74AHCT126NS only if interfacing with legacy 5 V TTL logic families; use SN74AHC126NS for mixed 2.5/3.3/5 V CMOS systems. |
| 74LVC126APW | Lower VCC range (1.65–5.5 V); 24 mA output drive; TSSOP-14 package only; no 125 °C rating | Preferred for ultra-low-voltage (1.8 V) FPGA I/O interfaces; unsuitable for automotive under-hood use due to −40 °C to +105 °C limit | Choose 74LVC126APW for space-constrained designs needing 1.8 V compatibility; retain SN74AHC126NS for full industrial temperature compliance and SO-14 footprint. |
Compared with SN74AHCT126NS and 74LVC126APW, SN74AHC126NS uniquely combines 2.0–5.5 V operation, 125 °C qualification, SO-14 packaging, and CMOS-input compatibility - making it the only option qualified for high-reliability industrial control and automotive body electronics where voltage flexibility and thermal robustness are mandatory.
Availability
SN74AHC126NS is available at Aetrix Electronics and suitable for industrial automation, automotive body control modules, and embedded computing applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC126NS 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 U.S.-based semiconductor company specializing in analog and embedded processing technologies, with leadership in logic, power management, and signal chain solutions.
The SN74AHC126NS belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity digital interfacing in industrial, automotive, and communications equipment.
FAQ
What is the maximum supply voltage for SN74AHC126NS?
The absolute maximum supply voltage (VCC) for SN74AHC126NS is +7.0 V, but the recommended operating range is 2.0 V to 5.5 V. Operation above 5.5 V voids parametric guarantees and risks permanent damage. All DC and AC specifications - including propagation delay, output drive, and input thresholds - are validated only within the 2.0–5.5 V range per the official datasheet.
Does SN74AHC126NS support 3.3 V logic levels?
Yes, SN74AHC126NS fully supports 3.3 V operation: VCC = 3.3 V falls within its 2.0–5.5 V range, input thresholds scale proportionally (VIL ≈ 0.9 V, VIH ≈ 2.1 V), and output VOH/VOL meet 3.3 V CMOS requirements (VOH ≥ 3.1 V, VOL ≤ 0.1 V at IO = ±4 mA). It is widely deployed in 3.3 V FPGA and microcontroller interfaces.
Can SN74AHC126NS drive a 50 Ω transmission line?
Yes, SN74AHC126NS can directly drive a 50 Ω transmission line: its ±25 mA output current rating supports 50 Ω termination to 3.3 V (66 mA) or 5 V (100 mA) with appropriate series resistance. For clean edge integrity, use a 33 Ω series resistor at the driver output - verified in TI application reports for controlled-impedance PCB routing with SN74AHC126NS.
Is SN74AHC126NS pin-compatible with 74LS126?
Yes, SN74AHC126NS is pin-compatible with 74LS126 in SO-14 packaging, sharing identical pin assignments for all 14 terminals. However, it is not a direct functional replacement: 74LS126 has active-LOW enables and TTL input thresholds, whereas SN74AHC126NS uses active-HIGH enables and CMOS thresholds. Logic-level translation may be required for interoperability.
What is the thermal performance of SN74AHC126NS in SO-14 package?
In the SO-14 package, SN74AHC126NS has a junction-to-ambient thermal resistance (θJA) of 110 °C/W. At 500 mW total power dissipation and 25 °C ambient, junction temperature reaches 80 °C - well within the 150 °C absolute maximum. Derating begins above 70 °C ambient at 8 mW/°C, ensuring reliable operation up to +125 °C case temperature when PCB copper area is optimized.
SN74AHC126NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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:
- 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
SN74AHC126NS FAQ
1.How can I place an order for SN74AHC126NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC126NS 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 SN74AHC126NS reliable?
The price and inventory of SN74AHC126NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC126NS is usually 5 days.
3.What payment methods are accepted for SN74AHC126NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHC126NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AHC126NS?
SN74AHC126NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC126NS 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 SN74AHC126NS?
For technical support, including SN74AHC126NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC126NS requirements.
6.How does Aetrix verify that SN74AHC126NS is sourced from the original manufacturer or authorized distributors?
All SN74AHC126NS 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 SN74AHC126NS meets industry standards.
7.What is the process for return or replacement of SN74AHC126NS?
All SN74AHC126NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC126NS, 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 SN74AHC126NS part is unused and in its original packaging.
Return procedure for SN74AHC126NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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