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Texas Instruments SN74ALVC125NSR
- Part No.:
- SN74ALVC125NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ALVC125NSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,787
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Product details
Overview
SN74ALVC125NSR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65 V to 3.6 V operation. It provides four independent non-inverting buffers, each with active-low output-enable control, ±24-mA drive capability at 3.3 V, 2.8 ns max propagation delay, and latch-up immunity exceeding 250 mA per JESD 17 - used in voltage-level-translating data buses in industrial microcontroller interfaces.
For engineers reviewing the SN74ALVC125NSR datasheet, SN74ALVC125NSR pinout, SN74ALVC125NSR application, or SN74ALVC125NSR equivalent, key selection criteria include its 14-pin SOP (NS) package, 3-state output architecture, rail-to-rail input compatibility across 1.65–3.6 V supply, low-power CMOS logic family behavior, and guaranteed 2.8 ns tpd at 3.3 V.
Technical Context
The SN74ALVC125NSR implements four identical non-inverting buffer stages, each with an independent active-low output-enable (OE) input controlling high-impedance state entry. Its logic diagram confirms positive-logic signal flow: when OE is low, Y follows A; when OE is high, Y is high-Z.
It operates within a 1.65–3.6 V VCC range with VIH/VIL thresholds scaling with VCC (e.g., VIH = 2.0 V min at VCC = 3.0 V), enabling interoperability between 1.8 V, 2.5 V, and 3.3 V logic domains. Input and output structures are fully CMOS-compatible with ESD protection per JESD 22 (2000-V HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V - supports mixed-voltage system interfacing without level shifters |
| Max Propagation Delay | 2.8 ns at VCC = 3.3 V - enables timing-critical data path buffering up to ~350 MHz toggle rate |
| Output Drive Strength | ±24 mA at VCC = 3.0 V - sufficient to drive 50-Ω transmission lines or fan-out to ≥10 LVTTL loads |
| Input Thresholds | VIL = 0.8 V max, VIH = 2.0 V min at VCC = 3.0 V - ensures robust noise margin in 3.3 V systems |
| 3-State Enable Time | max 3.5 ns (ten) at VCC = 3.3 V - allows fast bus arbitration and dynamic output control |
| Latch-up Immunity | >250 mA per JESD 17 - prevents destructive latch-up during transient overvoltage events |
| ESD Rating | 2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade reliability requirements |
Pinout & Package
SOP (NS) package: 14-pin plastic small-outline package, 8.1 mm × 10.4 mm body, 1.27 mm pitch, 1.75 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per buffer; high = high-Z output; pull-up to VCC recommended for power-up safety |
| 2, 5, 9, 12 | A (Data Input) | Non-inverting input for corresponding buffer stage; accepts 1.65–3.6 V logic levels |
| 3, 6, 8, 11 | Y (Buffered Output) | 3-state output; drives high/low when OE low; high-Z when OE high |
| 7 | GND | Ground reference for all logic and I/O; must be low-impedance connection |
| 14 | VCC | Power supply input; decoupling capacitor (0.1 µF ceramic) required near pin |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input voltage support | VI range = 0 to VCC - eliminates need for external biasing on mixed-supply buses |
| Low dynamic power consumption | ICC = 10 µA max at VCC = 3.6 V - reduces quiescent current in always-on subsystems |
| High noise immunity | VIL/VIL hysteresis >0.3 V at 3.3 V - suppresses false triggering from coupled transients |
| Fast 3-state disable timing | tdis = 4.0 ns max at VCC = 3.3 V - minimizes bus contention window during direction switching |
| Industry-standard pinout | Matches SN74LVC125, SN74LV125 families - simplifies drop-in replacement in legacy designs |
Applications
| Industrial PLC Backplane Interface | USB Hub Data Path Isolation |
|---|---|
Use Scenario: Isolating bidirectional data lanes between CPU and peripheral modules on a 24 V-powered programmable logic controller backplane. IC Role / Device Role / Timing Role: Quad buffer isolates 4-bit address/data bus segments; 3-state outputs prevent contention during module hot-swap. Use Value: ±24-mA drive sustains signal integrity over 15 cm PCB traces; 2.8 ns tpd preserves setup/hold margins in 25 MHz synchronous transfers. | Use Scenario: Enabling/disabling upstream/downstream USB 2.0 data paths in a multi-port hub IC with shared PHY resources. IC Role / Device Role / Timing Role: Buffers route D+ and D− signals between hub controller and port connectors; OE pins synchronized to port enable logic. Use Value: 3.5 ns ten ensures sub-cycle enable timing for USB SOF packet alignment; 1.65–3.6 V range matches hub controller I/O voltage. |
| Automotive Body Control Module Bus Extender | Test Equipment Digital Pattern Generator |
Use Scenario: Extending CAN/LIN-compatible digital control bus from main ECU to door module electronics in 12 V vehicle architecture. IC Role / Device Role / Timing Role: Buffers relay wake-up, reset, and configuration signals across noisy harness sections; OE tied to local power-good signal. Use Value: 2000-V HBM ESD rating withstands automotive assembly handling; latch-up immunity prevents failure during load-dump transients. | Use Scenario: Driving multiple parallel test channels from a single FPGA-based pattern generator in automated board test fixtures. IC Role / Device Role / Timing Role: Fan-out buffer replicates clock and stimulus vectors to 4 DUT interfaces; OE pins controlled by test sequence engine. Use Value: 2.8 ns tpd enables precise 350 MHz edge placement; ±24-mA drive ensures clean edges into 50-Ω scope inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125DR | Same pinout, 1.65–3.6 V, but lower drive (±24 mA only at VCC ≥ 3.0 V); tpd = 3.7 ns at 3.3 V | Suitable for lower-speed, cost-sensitive industrial controls where 0.9 ns timing margin is acceptable | Select when BOM cost reduction is prioritized over worst-case timing headroom |
| SN74LV125APWR | 1.65–5.5 V range, higher VCC tolerance, but reduced noise margin (VIL = 1.0 V max at 5 V); tpd = 5.5 ns at 5 V | Required for mixed 3.3 V/5 V legacy systems; not recommended for pure 3.3 V high-speed paths | Select only if 5 V interface compatibility is mandatory and speed penalty is acceptable |
Compared with SN74LVC125DR and SN74LV125APWR, the SN74ALVC125NSR delivers the fastest propagation delay (2.8 ns) and strongest guaranteed drive (±24 mA at 3.0 V) within its 1.65–3.6 V operating window - making it optimal for timing-critical 3.3 V data routing where both speed and robustness are essential.
Availability
SN74ALVC125NSR is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, USB hub data path isolation, and automotive body control module bus extension requiring stable component supply and long-term production continuity.
Supply support for SN74ALVC125NSR 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets since 1930.
The ALVC logic family - including SN74ALVC125NSR - was engineered for high-speed, low-voltage bus interfacing in portable and power-constrained systems, emphasizing sub-3 ns timing, rail-to-rail input compatibility, and robust ESD/latch-up performance.
FAQ
What is the maximum operating temperature range for the SN74ALVC125NSR?
The SN74ALVC125NSR is rated for operation from –40°C to +85°C ambient temperature, matching industrial-grade requirements. This range is validated across all electrical specifications in the datasheet, including propagation delay, drive strength, and input thresholds. The SOP (NS) package's thermal impedance of 76°C/W ensures safe junction temperatures under typical 24-mA load conditions at full VCC.
Can the SN74ALVC125NSR be used with a 1.8 V supply?
Yes, the SN74ALVC125NSR operates reliably at 1.8 V, as confirmed by its 1.65–3.6 V supply range specification. At 1.8 V, VIH is 1.17 V min (0.65 × VCC), VIL is 0.63 V max (0.35 × VCC), and tpd is 5.3 ns max - enabling interoperability with 1.8 V FPGAs and microcontrollers. All DC and AC parameters are guaranteed across this full voltage range.
Is the SN74ALVC125NSR pin-compatible with older 74-series logic devices?
The SN74ALVC125NSR uses the industry-standard 14-pin SOIC pinout defined for quad buffer gates (e.g., SN74LS125, SN74HC125), with identical pin assignments for OE, A, Y, GND, and VCC. However, it is not electrically compatible with bipolar TTL due to CMOS input structure and lower drive voltage thresholds - direct replacement requires verification of input/output voltage levels and timing margins.
How should unused inputs be handled on the SN74ALVC125NSR?
All unused inputs on the SN74ALVC125NSR - including OE and A pins - must be tied to either VCC or GND to prevent floating states that cause increased ICC, noise susceptibility, or undefined output behavior. TI recommends connecting unused OE pins to VCC via a pull-up resistor (e.g., 10 kΩ) to ensure default high-Z output, and unused A inputs directly to VCC or GND depending on desired default logic level.
Does the SN74ALVC125NSR support hot-swap or live-insertion applications?
The SN74ALVC125NSR supports hot-swap applications when OE is held high (via pull-up) during power-up/down sequences, forcing outputs into high-Z state before VCC stabilizes. Its absolute maximum ratings allow VI and VO to reach –0.5 V to VCC + 0.5 V, and its 2000-V HBM ESD rating protects against insertion transients. However, external series resistors and TVS diodes are still recommended for sustained bus fault protection.
SN74ALVC125NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 1.65V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
SN74ALVC125NSR FAQ
1.How can I place an order for SN74ALVC125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC125NSR 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 SN74ALVC125NSR reliable?
The price and inventory of SN74ALVC125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC125NSR is usually 5 days.
3.What payment methods are accepted for SN74ALVC125NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC125NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC125NSR?
SN74ALVC125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC125NSR 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 SN74ALVC125NSR?
For technical support, including SN74ALVC125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC125NSR requirements.
6.How does Aetrix verify that SN74ALVC125NSR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC125NSR 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 SN74ALVC125NSR meets industry standards.
7.What is the process for return or replacement of SN74ALVC125NSR?
All SN74ALVC125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC125NSR, 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 SN74ALVC125NSR part is unused and in its original packaging.
Return procedure for SN74ALVC125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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