My Inquiry
My Account
Texas Instruments SN74HC125NSR
- Part No.:
- SN74HC125NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74HC125NSR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,342
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC125NSR from Texas Instruments is a quadruple non-inverting buffer with 3-state outputs, designed for bus interface and signal enable applications in digital logic systems. It operates across 2 V to 6 V supply voltage, supports –40°C to +85°C ambient temperature, delivers propagation delay as low as 11 ns at 6 V (CL = 50 pF), and features balanced CMOS 3-state outputs capable of sourcing/sinking ±7.8 mA.
For engineers reviewing the SN74HC125NSR datasheet, SN74HC125NSR pinout, SN74HC125NSR application, or SN74HC125NSR equivalent, this page provides verified functional identity, validated SO package mapping, confirmed 14-pin SO pinout, real-world timing and drive specifications, and two rigorously cross-checked alternative parts for bus buffering and tri-state control use cases.
Technical Context
The SN74HC125NSR implements four independent positive-logic buffers (Y = A) with active-low 3-state output enables (OE). Each channel operates with standard CMOS inputs and balanced CMOS 3-state outputs, enabling high-impedance isolation when OE is high.
It complies with HCMOS electrical standards, supports fanout of up to 10 LSTTL loads, and exhibits low power consumption (ICC ≤ 80 µA at 6 V) compared to legacy TTL. Its input transition time requirement (≤400 ns at 6 V) ensures reliable switching without oscillation or shoot-through current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - Enables interoperability with 3.3 V and 5 V logic families without level shifters. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded and control applications. |
| Propagation Delay | 11 ns max at 6 V, CL = 50 pF - Supports >10 MHz data rates on buffered buses. |
| Output Drive | ±7.8 mA at 6 V - Sufficient to drive moderate capacitive loads (≤70 pF) and multiple CMOS inputs. |
| 3-State Leakage | ±0.5 µA max at 6 V - Ensures minimal bus contention during high-impedance state. |
| Input Capacitance | 10 pF max - Limits loading on upstream drivers and preserves signal integrity. |
| Power Dissipation Cap. | 45 pF per gate - Used to calculate dynamic power (P = Cpd × f × V²) in clocked systems. |
Pinout & Package
SN74HC125NSR is housed in a 14-pin Small Outline (SO) package (body size 10.20 mm × 5.30 mm), RoHS-compliant, with standard JEDEC MO-002AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel x Output Enable (OE) | Active-low control: drives corresponding Y output to high-Z when high; enables pass-through when low. |
| 2, 5, 9, 12 | Channel x Input (A) | Non-inverting data input; CMOS-compatible with VIH/VIL thresholds scaling with VCC. |
| 3, 6, 8, 11 | Channel x Output (Y) | 3-state buffered output; replicates A when OE low; high-impedance when OE high. |
| 7 | GND | Ground reference for all I/O and internal circuitry; must be low-impedance connection. |
| 14 | VCC | Positive supply rail; bypass capacitor (0.1 µF) required adjacent to pin for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent buffers | Four isolated channels allow selective bus segment control without inter-channel coupling. |
| 3-State outputs with balanced drive | Sources and sinks matched current (±7.8 mA), minimizing bus skew and ensuring clean high-Z transitions. |
| Wide supply range (2–6 V) | Eliminates need for separate voltage rails when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral). |
| Low ICC (≤80 µA) | Reduces quiescent power in always-on logic sections; critical for battery-backed or energy-constrained designs. |
| Standard CMOS input structure | High-impedance inputs (≤1 µA leakage) minimize loading on preceding stages and simplify termination. |
Applications
| Industrial Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Isolating legacy 5 V parallel address/data buses during firmware updates or partial system power-down. IC Role / Device Role / Timing Role: SN74HC125NSR acts as a bidirectional 3-state bus gate, enabling/disabling signal flow under microcontroller control with nanosecond-level timing fidelity. Use Value: Prevents back-driving of powered-off peripherals and eliminates bus contention, verified by ≤31 ns disable delay (tdis) at 6 V. |
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M0+ MCU to drive eight external LED indicators and two status lines. IC Role / Device Role / Timing Role: SN74HC125NSR serves as a non-inverting buffer with independent OE control, decoupling MCU pins from capacitive load and enabling software-configurable output enable. Use Value: Allows safe driving of 20 mA LEDs via external transistors while maintaining logic-level compatibility and reducing MCU pin stress. |
| Test Equipment Signal Gating | Programmable Logic Interface |
|
Use Scenario: Enabling precise signal injection into DUTs during automated test sequences using FPGA-controlled stimulus generators. IC Role / Device Role / Timing Role: SN74HC125NSR functions as a digitally controlled analog switch substitute, passing calibrated waveforms only when OE is asserted. Use Value: Achieves <15 ns enable/disable timing margins (ten/tdis) at 4.5 V, supporting sub-30 ns pulse gating accuracy. |
Use Scenario: Interfacing CPLD configuration data lines to a host processor's memory-mapped bus with dynamic read/write arbitration. IC Role / Device Role / Timing Role: SN74HC125NSR provides direction-controlled tri-state buffering between bidirectional data bus and unidirectional CPLD I/O pins. Use Value: Enables clean bus sharing without external direction logic, leveraging built-in 3-state control synchronized to processor strobes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT125NSR | CMOS inputs with TTL-compatible thresholds (VIH = 2.0 V min); identical pinout and timing. | Better suited for direct interfacing with 5 V TTL outputs without level translation. | Select when driving from legacy 5 V TTL sources; otherwise SN74HC125NSR offers wider VCC flexibility. |
| 74LVC125APW,118 | Lower VCC range (1.65–5.5 V); higher speed (tpd = 3.2 ns typ at 3.3 V); different TSSOP-14 package. | Optimized for high-speed 3.3 V systems; not drop-in due to different thermal and layout characteristics. | Choose for new 3.3 V designs requiring <5 ns propagation; retain SN74HC125NSR for 2–6 V operation or SO package compliance. |
Compared with SN74HC125NSR, SN74HCT125NSR improves TTL input compatibility but sacrifices 2 V operation, while 74LVC125APW,118 gains speed and lower voltage support at the cost of package change and reduced 6 V tolerance - making SN74HC125NSR the optimal choice for broad-voltage industrial bus isolation where SO packaging is mandated.
Availability
SN74HC125NSR is available at Aetrix Electronics and suitable for industrial bus isolation, microcontroller GPIO expansion, test equipment signal gating, and programmable logic interface applications requiring stable component supply, long-term lifecycle assurance, and consistent SO package delivery.
Supply support for SN74HC125NSR 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 delivering analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability IC design and manufacturing.
The SN74HC125NSR belongs to TI's industry-standard 74HC logic family, engineered for robust performance in industrial control, instrumentation, and communication infrastructure where wide voltage operation and predictable 3-state behavior are essential.
FAQ
What is the maximum capacitive load SN74HC125NSR can drive while meeting datasheet timing specs?
The SN74HC125NSR is characterized for CL ≤ 70 pF in typical application guidance. At 50 pF, it achieves 11 ns max propagation delay at 6 V; at 150 pF, delay increases to 39 ns. Exceeding 70 pF may degrade timing margins and increase transition time - adding a series resistor is recommended if larger loads are unavoidable. The SN74HC125NSR datasheet specifies CL = 50 pF and CL = 150 pF test conditions explicitly.
Does SN74HC125NSR support 2.5 V logic systems?
Yes, SN74HC125NSR is fully specified down to 2 V supply voltage. At 2.5 V, VIH is 1.7 V min and VIL is 0.7 V max per Recommended Operating Conditions, and propagation delay remains within 180 ns (typ 47 ns). This makes SN74HC125NSR suitable for mixed-voltage domains including 2.5 V FPGAs and low-power microcontrollers.
Can unused inputs on SN74HC125NSR be left floating?
No - unused inputs on SN74HC125NSR must be terminated to VCC or GND. Floating CMOS inputs cause undefined logic states, increased ICC, and potential oscillation due to noise sensitivity. TI recommends 10-kΩ pull-up or pull-down resistors for unused OE or A pins, as confirmed in Section 9.2.1.2 of the SN74HC125NSR datasheet.
What is the thermal resistance (RθJA) of SN74HC125NSR in its SO package?
The SN74HC125NSR in the 14-pin SO (NS) package has a junction-to-ambient thermal resistance (RθJA) of 122.6°C/W, as published in Section 6.4 of the official datasheet. This value assumes standard JEDEC 2-layer board conditions and informs derating calculations for continuous operation at elevated ambient temperatures.
Is SN74HC125NSR pin-compatible with SN74HC125DR?
Yes - SN74HC125NSR (SO-14) and SN74HC125DR (SOIC-14) share identical pinout, function mapping, and electrical specifications. Both use the same 14-pin SO footprint (JEDEC MO-002AC), though body dimensions differ slightly (NS: 10.20 × 5.30 mm; D/DR: 8.70 × 3.90 mm). Layout compatibility requires verifying land pattern tolerances per IPC-7351.
SN74HC125NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74HC125NSR FAQ
1.How can I place an order for SN74HC125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC125NSR 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 SN74HC125NSR reliable?
The price and inventory of SN74HC125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC125NSR is usually 5 days.
3.What payment methods are accepted for SN74HC125NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC125NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC125NSR?
SN74HC125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC125NSR 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 SN74HC125NSR?
For technical support, including SN74HC125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC125NSR requirements.
6.How does Aetrix verify that SN74HC125NSR is sourced from the original manufacturer or authorized distributors?
All SN74HC125NSR 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 SN74HC125NSR meets industry standards.
7.What is the process for return or replacement of SN74HC125NSR?
All SN74HC125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC125NSR, 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 SN74HC125NSR part is unused and in its original packaging.
Return procedure for SN74HC125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC125NSR 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…
