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Texas Instruments SN74F125NSR
- Part No.:
- SN74F125NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74F125NSR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
SN74F125NSR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for bidirectional data bus isolation and memory address register buffering in TTL-compatible digital systems. It features four independent noninverting buffers, each with separate output-enable (OE) control, 5 V nominal supply operation, 6.5 ns max propagation delay at 5 V/50 pF, and ±64 mA low-state output drive capability.
For engineers reviewing the SN74F125NSR datasheet, SN74F125NSR pinout, SN74F125NSR application, or SN74F125NSR equivalent, this device is selected for legacy TTL system upgrades, bus arbitration in industrial controllers, and level-translated signal routing where 3-state contention control and deterministic disable timing are required.
Technical Context
The SN74F125NSR implements four identical noninverting buffer stages, each with dedicated active-low output-enable inputs controlling high-impedance (Z) state entry/exit. Its logic function follows standard positive-logic truth table: OE = L enables Y = A; OE = H forces Y = Z. No internal inversion or latching occurs.
Designed for F-series TTL compatibility, it operates across 4.5–5.5 V, supports 0°C to 70°C ambient, and delivers guaranteed 2.0 V VOH at –15 mA and 0.55 V VOL at 64 mA under recommended conditions. Switching performance is characterized with 50 pF capacitive load and 500 Ω termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures interoperability with standard 5 V TTL and mixed-voltage backplanes. |
| Propagation Delay (tPLH/tPHL) | 1.2–6.5 ns - Enables reliable operation in sub-100 MHz synchronous bus environments. |
| Output Drive (IOL) | 64 mA - Sufficient to drive 10 standard TTL loads or terminate stubbed bus segments. |
| 3-State Disable Time (tPZL) | 3.2–9 ns - Guarantees fast bus release for time-critical arbitration cycles. |
| Input Thresholds (VIH/VIL) | 2.0 V / 0.8 V - Matches TTL logic family thresholds for direct interface without level shifting. |
| Quiescent Current (ICCL) | 28–40 mA - Reflects F-series bipolar power consumption; requires thermal-aware PCB layout. |
| Package Type | SOP-14 (NS) - 150 mil body width, gull-wing leads, RoHS-compliant NIPDAU finish, MSL Level-1. |
Pinout & Package
SOP-14 (NS) package: 150-mil body width, 1.27 mm lead pitch, gull-wing surface-mount terminals, 1.75 mm max height, pin 1 marked by notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OEn (Output Enable) | Active-low control per buffer; high = 3-state output; critical for bus contention avoidance. |
| 2, 5, 11, 14 | An (Input) | Noninverting data input; TTL-compatible voltage thresholds ensure noise margin in noisy environments. |
| 3, 6, 12, 9 | Yn (Output) | 3-state buffered output; capable of sourcing/sinking up to ±64 mA in active state. |
| 7 | GND | Power return reference; must be low-inductance connection to minimize ground bounce during switching. |
| 14 | VCC | +5 V supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus segment isolation without affecting other channels - essential for multi-master arbitration. |
| Guaranteed 64 mA sink capability | Drives full TTL fan-out (10 loads) directly, eliminating need for external pull-up resistors on shared buses. |
| Fast enable/disable timing (tPZH/tPZL ≤ 9 ns) | Minimizes bus turnaround latency in high-speed memory or peripheral interfaces. |
| TTL-compatible input thresholds | Eliminates level-shifter requirements when interfacing with legacy 74LS/74F logic families. |
| SOP-14 RoHS-compliant packaging | Supports automated SMT assembly with standard reflow profiles (MSL Level-1, 260°C peak). |
Applications
| Industrial PLC Backplane Interface | Legacy Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating CPU address lines from multiple I/O modules sharing a common backplane bus. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed address broadcast with zero contention risk. Use Value: Prevents bus lockup during module hot-swap by ensuring only one SN74F125NSR output drives at any time. |
Use Scenario: Driving 16-bit address bus to multiple SRAM chips in an embedded controller with limited drive strength. IC Role / Device Role / Timing Role: Noninverting buffer stage amplifying microcontroller address outputs to meet TTL fan-out requirements. Use Value: Delivers 64 mA sink current per line, supporting full 10-load fan-out without signal degradation. |
| Test Equipment Signal Routing | Automated Test Fixture Bus Arbitration |
|
Use Scenario: Routing configurable stimulus signals between DUT interface and pattern generator in ATE systems. IC Role / Device Role / Timing Role: Channel-selectable bus gate enabling dynamic path reconfiguration via OE control lines. Use Value: 3.2 ns tPZL ensures sub-10 ns path disable - critical for glitch-free test vector sequencing. |
Use Scenario: Managing shared JTAG or boundary-scan bus among multiple devices on a production test board. IC Role / Device Role / Timing Role: 3-state multiplexer substitute allowing single controller to address individual DUTs sequentially. Use Value: Independent OE pins permit precise per-device enable timing, avoiding bus contention during scan chain initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS125N | Lower drive (8 mA IOL), slower propagation (15 ns typ), higher noise immunity (VIL = 0.8 V same, but VIH = 2.0 V same). | Preferred in low-power, noise-sensitive analog-adjacent systems where speed is secondary. | Select when power budget < 20 mA per buffer and bus frequency < 10 MHz. |
| SN74ACT125DR | CMOS process, 5 V tolerant, 24 mA IOL, 5.5 ns max tPLH, lower ICC (4 µA typ), wider VCC range (4.5–5.5 V). | Better suited for mixed-voltage designs requiring 3.3 V logic interfacing or longer-term obsolescence mitigation. | Select when upgrading legacy designs toward lower power, higher noise margin, or future-proofing against F-series discontinuation. |
Compared with SN74F125NSR, SN74LS125N trades speed and drive for reduced power and cost in static systems, while SN74ACT125DR offers CMOS efficiency and voltage flexibility at the expense of peak drive strength - making each suitable for distinct lifecycle or performance tiers.
Availability
SN74F125NSR is available at Aetrix Electronics and suitable for industrial PLC backplanes, legacy memory subsystems, and automated test equipment requiring stable component supply with long-lifecycle support and consistent parametric performance.
Supply support for SN74F125NSR 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 SN74F125NSR belongs to TI's 74F logic family - engineered for high-speed TTL-compatible digital interfacing in industrial control, instrumentation, and legacy system maintenance applications.
FAQ
What is the maximum operating temperature range for the SN74F125NSR?
The SN74F125NSR is rated for 0°C to 70°C ambient operating free-air temperature, matching commercial-grade TTL specifications. This range is validated per TI's recommended operating conditions and applies to all SOP-14 packaged variants including SN74F125NSR. Operation outside this range may result in timing violations or increased ICC leakage.
Does the SN74F125NSR support hot insertion into a live bus?
The SN74F125NSR does not include built-in hot-swap protection circuitry. While its 3-state outputs prevent contention when OE is high, applying VCC before GND or exposing inputs to voltage before power-up risks latch-up per absolute maximum ratings. For hot-insertion use, external current-limiting and sequencing controls are required - SN74F125NSR itself provides no intrinsic hot-swap robustness.
Can SN74F125NSR outputs safely drive a 50 Ω transmission line?
No - SN74F125NSR is not designed for 50 Ω line driving. Its output structure targets TTL fan-out (10 loads), not controlled-impedance signaling. Driving 50 Ω directly would exceed IOL (64 mA) and IOH (–15 mA) limits, causing excessive VOL/VOH shift and potential damage. Use dedicated line drivers (e.g., SN74F244) or series termination for such applications.
Is SN74F125NSR pin-compatible with SN74F125DR?
Yes - SN74F125NSR (SOP-14) and SN74F125DR (SOIC-14) share identical pinout, logic function, and electrical specifications. Both use 14-pin packages with identical terminal numbering (1OE, 1A, 1Y, ..., VCC, GND). However, SOP-14 (NS) has slightly wider body (5.3 mm vs. 3.9 mm) and different land pattern - PCB layout must match NS footprint, not D.
What is the recommended bypass capacitor for SN74F125NSR?
A 0.1 µF ceramic capacitor placed within 5 mm of the SN74F125NSR VCC and GND pins is mandatory. This mitigates high-frequency supply noise generated during simultaneous output switching. For systems with >4 SN74F125NSR devices, add a bulk 4.7 µF tantalum capacitor per 10 devices on the same 5 V rail to suppress low-frequency droop.
SN74F125NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- 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:
- 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
SN74F125NSR FAQ
1.How can I place an order for SN74F125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F125NSR 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 SN74F125NSR reliable?
The price and inventory of SN74F125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F125NSR is usually 5 days.
3.What payment methods are accepted for SN74F125NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F125NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F125NSR?
SN74F125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F125NSR 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 SN74F125NSR?
For technical support, including SN74F125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F125NSR requirements.
6.How does Aetrix verify that SN74F125NSR is sourced from the original manufacturer or authorized distributors?
All SN74F125NSR 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 SN74F125NSR meets industry standards.
7.What is the process for return or replacement of SN74F125NSR?
All SN74F125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F125NSR, 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 SN74F125NSR part is unused and in its original packaging.
Return procedure for SN74F125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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