My Inquiry
My Account
Texas Instruments SN74F126NS
- Part No.:
- SN74F126NS
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74F126NS.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,155
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74F126NS from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and memory address register buffering in TTL-compatible digital systems. It operates from 4.5 V to 5.5 V, delivers max propagation delay of 6.5 ns at 5 V, supports ±64 mA output drive, and features independent OE-controlled tri-state outputs per channel.
For engineers reviewing the SN74F126NS datasheet, SN74F126NS pinout, SN74F126NS application, or SN74F126NS equivalent, this device is selected for high-speed bus driving where low-power 3-state control, predictable timing margins, and legacy TTL logic compatibility are required in industrial control backplanes and vintage computing interfaces.
Technical Context
The SN74F126NS implements four independent noninverting buffers, each with dedicated active-high output-enable (OE) control. Each buffer transitions between low-impedance drive and high-impedance state without internal latching or inversion.
Its switching behavior is characterized under 50 pF load and 500 Ω termination, with tPLH/tPHL ≤ 8.5 ns across temperature (0°C to 70°C), and enable/disable times (tPZH/tPZL/tPHZ/tPLZ) tightly bounded to ≤ 8.5 ns - enabling precise bus arbitration in synchronous parallel architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL supply rails and tolerance against rail droop during transient loading. |
| Max tpd | 6.5 ns at VCC = 5 V, CL = 50 pF - guarantees sub-7 ns signal path delay for timing-critical address/data bus buffering. |
| IOL / IOH | 64 mA sink / –15 mA source - drives standard TTL loads directly without external pull-ups or level-shifting. |
| 3-State Leakage | ±50 µA at VO = 0.5 V / 2.7 V - minimizes bus contention current when outputs are disabled. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - matches standard TTL logic levels for seamless interfacing with 74LS/74F families. |
| Operating Temp | 0°C to 70°C - qualified for commercial-grade embedded systems, test equipment, and legacy industrial controllers. |
Pinout & Package
SN74F126NS is housed in a 14-pin SOP (Small Outline Package) with NS package designation, 5.3 mm body width, and standard 1.27 mm lead pitch - compatible with automated SMT assembly and IPC-7351B footprint SN14A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-high control per buffer; must be pulled low via resistor at power-up to guarantee high-impedance default state. |
| 2, 5, 11, 14 | A (Input) | Noninverting data input for corresponding buffer channel; accepts TTL-level signals directly. |
| 3, 6, 12, 9 | Y (Output) | 3-state buffered output; presents low-impedance logic level when OE = H, high-Z when OE = L. |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry; requires low-inductance connection to minimize noise coupling. |
| 14 | VCC | Positive supply terminal; bypassing with 0.1 µF ceramic capacitor near pin is mandatory for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus segment isolation without affecting other channels - critical for multi-master arbitration in shared-data systems. |
| Guaranteed high-impedance on power-up | OE tied to GND via pulldown resistor ensures safe bus release before system initialization completes. |
| TTL-compatible input thresholds | VIH = 2.0 V / VIL = 0.8 V eliminates need for level translators when interfacing with legacy 74LS/74ALS logic. |
| Low-output leakage in disable state | IOZL/IOZH ≤ ±50 µA prevents unintended bus loading or false triggering in high-impedance mode. |
Applications
| Memory Address Buffering | Parallel Bus Isolation |
|---|---|
|
Use Scenario: Driving address lines from a microprocessor to multiple memory ICs on a shared bus. IC Role / Device Role / Timing Role: Noninverting buffer with per-line 3-state control, isolating address space during DMA or peripheral access. Use Value: Prevents address bus contention during memory banking while maintaining <6.5 ns propagation delay for cycle-time compliance. |
Use Scenario: Separating CPU data bus from peripheral I/O bus in an industrial PLC backplane. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling controlled data flow between two asynchronous subsystems. Use Value: Enables clean bus turn-around with <8.5 ns enable/disable timing, eliminating glitches during direction switching. |
| Legacy System Interfacing | Test Equipment Signal Conditioning |
|
Use Scenario: Adapting modern FPGA I/O to legacy TTL-based instrumentation racks. IC Role / Device Role / Timing Role: Level- and drive-strength translator ensuring full TTL fan-out capability and voltage compatibility. Use Value: Provides 64 mA sink current to meet original equipment specs without redesigning PCB trace routing or termination. |
Use Scenario: Buffering control signals in automated test fixtures handling mixed-voltage DUTs. IC Role / Device Role / Timing Role: Glitch-free signal repeater with deterministic enable timing for synchronized stimulus delivery. Use Value: Guarantees <8 ns worst-case enable-to-output delay, supporting sub-100 ns test sequence timing windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS126N | Slower max tpd (15 ns), lower IOL (8 mA), TTL-input only - no F-series speed or drive strength. | Suitable only for non-critical, low-frequency bus extensions where timing margin is >20 ns. | Select only if legacy LS-family sourcing or cost sensitivity outweighs performance requirements. |
| SN74ACT126D | CMOS input (VIH = 2 V min), higher speed (tPLH = 3.5 ns typ), wider VCC (4.5–5.5 V), but higher input capacitance (5 pF). | Better for mixed-logic systems with CMOS controllers; less tolerant of noisy TTL environments due to higher noise immunity threshold. | Prefer when interfacing with ACT or advanced CMOS logic; avoid in electrically noisy industrial settings unless filtered. |
Compared with SN74F126NS, SN74LS126N trades speed and drive for lower power and broader legacy support, while SN74ACT126D offers faster switching and CMOS compatibility at the cost of increased sensitivity to input transients - making SN74F126NS optimal for deterministic TTL bus timing with robust noise margin.
Availability
SN74F126NS is available at Aetrix Electronics and suitable for memory address buffering, parallel bus isolation, and legacy system interfacing requiring stable component supply and long-term obsolescence management.
Supply support for SN74F126NS 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 50 years of innovation in industrial, automotive, and communications markets.
The SN74F126NS belongs to TI's 74F logic family - engineered for high-speed, low-noise TTL-compatible digital interfacing in mission-critical industrial and test equipment where timing predictability and bus integrity are essential.
FAQ
What is the recommended power-up sequence for SN74F126NS to ensure safe 3-state behavior?
TI specifies that OE pins must be held low during power-up to guarantee high-impedance outputs. A pulldown resistor (value determined by driver sourcing capability) tied from each OE to GND satisfies this requirement. This prevents bus contention before system firmware asserts valid OE states. The SN74F126NS does not include internal power-on reset, so external biasing is mandatory for reliable operation.
Can SN74F126NS drive standard TTL loads without external components?
Yes. The SN74F126NS provides 64 mA sink and –15 mA source capability per output, meeting or exceeding standard TTL fan-out requirements (10x 74LS loads). Its VIH/VIL thresholds (2.0 V/0.8 V) and 5-V operation align directly with TTL specifications, eliminating need for level shifters or series resistors in compliant designs.
What is the maximum capacitive load SN74F126NS can drive while maintaining specified timing?
The SN74F126NS switching characteristics are guaranteed with CL = 50 pF, as defined in the datasheet test conditions. Driving loads beyond 50 pF increases propagation delay nonlinearly and may violate setup/hold timing in high-speed buses. For >50 pF loads, derating analysis or buffer staging is required - the SN74F126NS itself is not characterized beyond this value.
Is SN74F126NS RoHS-compliant and lead-free?
Yes. The SN74F126NS is manufactured in TI's green (RoHS & no Sb/Br) process with CU NIPDAU finish and complies with JEDEC MSL Level-1 moisture sensitivity classification. It is rated for unlimited floor life at ≤30°C/60% RH and supports standard lead-free reflow profiles up to 260°C peak.
How does SN74F126NS differ from SN74F125 in practical use?
The SN74F126NS features noninverting buffers, while SN74F125 provides inverting buffers. Both share identical pinout, timing, and electrical specs. Selection depends strictly on logic polarity requirements: SN74F126NS preserves input signal phase for address/data forwarding; SN74F125 is used where inversion is needed for control signal generation or complemented bus protocols.
SN74F126NS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74F126NS FAQ
1.How can I place an order for SN74F126NS through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F126NS 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 SN74F126NS reliable?
The price and inventory of SN74F126NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F126NS is usually 5 days.
3.What payment methods are accepted for SN74F126NS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F126NS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F126NS?
SN74F126NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F126NS 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 SN74F126NS?
For technical support, including SN74F126NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F126NS requirements.
6.How does Aetrix verify that SN74F126NS is sourced from the original manufacturer or authorized distributors?
All SN74F126NS 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 SN74F126NS meets industry standards.
7.What is the process for return or replacement of SN74F126NS?
All SN74F126NS units undergo pre-shipment inspection (PSI). If there is an issue with SN74F126NS, 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 SN74F126NS part is unused and in its original packaging.
Return procedure for SN74F126NS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74F126NS Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
