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Texas Instruments SN74ALVC125DR
- Part No.:
- SN74ALVC125DR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALVC125DR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,445
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Product details
Overview
SN74ALVC125DR from Texas Instruments is a quadruple bus buffer gate with 3-state outputs, designed for 1.65 V to 3.6 V operation in digital logic interfacing. It provides four independent non-inverting buffers, each with active-low output-enable control, ±24-mA drive capability at 3.3 V, and 2.8 ns max propagation delay. It is used in level-shifting, bus isolation, and signal fan-out applications within industrial and communications systems.
For engineers reviewing the SN74ALVC125DR datasheet, SN74ALVC125DR pinout, SN74ALVC125DR application, or SN74ALVC125DR equivalent, key selection criteria include supply voltage range (1.65–3.6 V), 3-state output timing (tdis/ten ≤ 4 ns at 3.3 V), output drive strength (±24 mA), latch-up immunity (>250 mA), and SOIC-14 package compatibility with legacy board layouts.
Technical Context
The SN74ALVC125DR implements four identical CMOS buffer stages, each with separate 3-state control via dedicated OE inputs. Its logic diagram confirms positive-logic enable behavior: output Y follows input A when OE is low, and enters high-impedance state when OE is high.
It operates across the full 1.65–3.6 V VCC range with guaranteed performance - including VIH/VIL thresholds scaled to VCC, rail-to-rail VO swing (0 to VCC), and stable tpd/tens/tdis over temperature (−40°C to +85°C). Input and output structures meet JESD 22 ESD standards (2000-V HBM, 200-V MM, 1000-V CDM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.65 V to 3.6 V - supports mixed-voltage system interfacing (e.g., 1.8 V FPGA to 3.3 V peripheral) |
| Max Propagation Delay | 2.8 ns at 3.3 V - enables reliable operation in >300 MHz data paths with margin |
| Output Drive | ±24 mA at 3.3 V - drives 50-Ω transmission lines or multiple CMOS loads without external buffering |
| Input Thresholds | VIL = 0.35×VCC (min), VIH = 0.65×VCC (min) - ensures noise-immune switching across full VCC range |
| 3-State Enable Time | ten ≤ 3.5 ns at 3.3 V - allows fast bus arbitration and dynamic signal routing |
| 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 IEC 61000-4-2 system-level robustness requirements |
Pinout & Package
SN74ALVC125DR is housed in a 14-pin SOIC (D) package, 3.90 mm wide, 8.65 mm long, 1.75 mm max height, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per buffer - tie high to disable output; pull-up resistor recommended for power-up safety |
| 2, 5, 11, 14 | A (Data Input) | Non-inverting input for corresponding buffer stage - accepts 1.65–3.6 V logic levels |
| 3, 6, 12, 9 | Y (Buffered Output) | 3-state output - high-impedance when OE = high; driven low/high when OE = low |
| 7 | GND | Ground reference for all I/O and internal circuitry - must be low-inductance connection |
| 14 | VCC | Power supply - bypass with 0.1 µF ceramic capacitor near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.65 V to 3.6 V - eliminates need for level shifters between 1.8 V, 2.5 V, and 3.3 V domains |
| High-Speed Performance | 2.8 ns tpd at 3.3 V - supports high-throughput data buses in FPGAs, microcontrollers, and ASIC interfaces |
| Strong Output Drive | ±24 mA at 3.3 V - directly drives terminated lines or up to 10 LVTTL loads without degradation |
| Robust ESD Protection | 2000-V HBM - reduces field failure risk in handling and system integration |
| Controlled Power-Up State | OE tied to VCC via pull-up ensures high-Z output at power-on - prevents bus contention |
Applications
| Industrial PLC Backplane Interface | Low-Power MCU Peripheral Expansion |
|---|---|
Use Scenario: Isolating and buffering address/data lines between a 3.3 V ARM Cortex-M7 MCU and legacy 5 V-tolerant I/O modules via level-translating bus transceivers. IC Role / Device Role / Timing Role: SN74ALVC125DR acts as a direction-controlled, 3-state bus buffer - enabling bidirectional data flow while preventing contention during read/write transitions. Use Value: Delivers sub-3 ns propagation delay and ±24 mA drive to maintain signal integrity across 15 cm PCB traces, eliminating need for additional repeaters. | Use Scenario: Expanding GPIO count of an ultra-low-power MSP430 microcontroller by driving external SPI peripherals (ADC, DAC, EEPROM) on a shared bus. IC Role / Device Role / Timing Role: SN74ALVC125DR serves as a controlled fan-out buffer - isolating MCU pins from capacitive loading of multiple devices and enabling selective device activation via OE. Use Value: 1.65 V minimum VCC allows direct operation from the MCU's 1.8 V LDO, reducing BOM count and power loss versus discrete MOSFET-based solutions. |
| Automotive Infotainment Display Interface | Test Equipment Signal Routing Matrix |
Use Scenario: Buffering parallel RGB video signals (16-bit data + HS/VS) from a display controller to an LVDS transmitter IC in a vehicle head unit. IC Role / Device Role / Timing Role: SN74ALVC125DR functions as a timing-critical signal conditioner - preserving edge rates and minimizing skew across parallel lanes before serialization. Use Value: 2.8 ns tpd and matched propagation delays (<0.5 ns inter-channel skew) ensure pixel-aligned sampling at 60 MHz pixel clocks. | Use Scenario: Building a programmable signal routing matrix in automated test equipment, where DUT signals are dynamically connected to measurement instruments via FPGA-controlled buffers. IC Role / Device Role / Timing Role: SN74ALVC125DR operates as a digitally controlled analog switch substitute - providing low-on-resistance (<5 Ω), rail-to-rail signal pass-through with no DC bias dependency. Use Value: 3-state outputs allow multiple buffers to share a common measurement bus without hardware switches or relays, cutting switching time from ms to ns scale. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125ADR | Slightly higher ICC (15 µA vs. 10 µA), identical VCC range and timing; same SOIC-14 footprint | Same functional role; marginally higher static current may affect battery-powered designs | Preferred for cost-sensitive volume production where TI LVC family qualification is already established |
| 74AUP1G125GW,125 | Single-channel, 5-pin SC-70 package; lower drive (±4 mA), slower tpd (5.2 ns at 3.3 V) | Not pin-compatible; requires four devices and more PCB area to match quad functionality | Only suitable when space-constrained single-buffer use cases dominate and drive/current specs permit |
Compared with SN74LVC125ADR and 74AUP1G125GW,125, the SN74ALVC125DR delivers optimal balance of speed (2.8 ns), drive strength (±24 mA), and quad-channel integration in standard SOIC - making it the preferred choice for high-density, high-speed bus interface designs requiring minimal layout change.
Availability
SN74ALVC125DR is available at Aetrix Electronics and suitable for industrial automation, automotive infotainment, and test equipment applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for SN74ALVC125DR 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 personal electronics markets.
The SN74ALVC125DR belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for high-speed, low-voltage operation across mixed-supply systems - specifically targeting bus interface, signal isolation, and level translation in resource-constrained embedded platforms.
FAQ
What is the maximum operating temperature for the SN74ALVC125DR?
The SN74ALVC125DR is rated for continuous operation from −40°C to +85°C ambient temperature. This range is validated per JEDEC JESD78 and confirmed in the Recommended Operating Conditions table of the official datasheet (SCES110H). Thermal derating is not required within this range, and θJA = 86°C/W for the SOIC-D package ensures safe junction temperatures under typical load conditions.
Does the SN74ALVC125DR support 5 V tolerant inputs?
No, the SN74ALVC125DR does not support 5 V tolerant inputs. Its absolute maximum input voltage is VCC + 0.5 V (max 4.6 V), and recommended VI is limited to 0–VCC. Applying 5 V to any input violates Absolute Maximum Ratings and risks permanent damage. For 5 V interface applications, TI recommends the SN74LVC125A or SN74LVCH125A, which specify 5 V tolerant inputs.
Can the SN74ALVC125DR be used with a 1.8 V supply?
Yes, the SN74ALVC125DR is fully specified and characterized for operation at 1.8 V. At VCC = 1.8 V, it guarantees tpd ≤ 5.3 ns, VIH ≥ 1.17 V, VIL ≤ 0.63 V, and output drive ≥ ±4 mA. These parameters are explicitly listed in the Recommended Operating Conditions and Electrical Characteristics tables, confirming robust functionality in 1.8 V systems such as modern low-power MCUs and FPGAs.
Is the SN74ALVC125DR pin-compatible with the SN74ALVC125D?
Yes, the SN74ALVC125DR is pin-compatible with the SN74ALVC125D. Both use the same SOIC-14 (D) package with identical pinout, mechanical dimensions, and thermal characteristics. The only difference is packaging format: SN74ALVC125D ships in tubes (50 pcs), while SN74ALVC125DR uses tape-and-reel (2500 pcs) - making them interchangeable on PCBs and suitable for both prototyping and high-volume SMT assembly.
What is the recommended pull-up resistor value for OE pins on the SN74ALVC125DR?
Texas Instruments recommends tying each OE pin to VCC through a pull-up resistor to ensure high-impedance output during power-up. The minimum value is determined by the current-sinking capability of the driving source - typically 10 kΩ to 100 kΩ suffices for most microcontroller or FPGA GPIO drivers. A 47 kΩ resistor is commonly used, limiting current to <100 µA at 3.3 V while ensuring fast, noise-immune disable transitions.
SN74ALVC125DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
SN74ALVC125DR FAQ
1.How can I place an order for SN74ALVC125DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC125DR 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 SN74ALVC125DR reliable?
The price and inventory of SN74ALVC125DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC125DR is usually 5 days.
3.What payment methods are accepted for SN74ALVC125DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC125DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC125DR?
SN74ALVC125DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC125DR 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 SN74ALVC125DR?
For technical support, including SN74ALVC125DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC125DR requirements.
6.How does Aetrix verify that SN74ALVC125DR is sourced from the original manufacturer or authorized distributors?
All SN74ALVC125DR 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 SN74ALVC125DR meets industry standards.
7.What is the process for return or replacement of SN74ALVC125DR?
All SN74ALVC125DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC125DR, 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 SN74ALVC125DR part is unused and in its original packaging.
Return procedure for SN74ALVC125DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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