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Texas Instruments SN74ALVC125D
- Part No.:
- SN74ALVC125D
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74ALVC125D.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:937
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Product details
Overview
SN74ALVC125D 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 controlled by a dedicated output-enable (OE) input, delivering ±24-mA drive at 3.3 V and achieving 2.8 ns max propagation delay. It is used in level-shifting, bus isolation, and signal fan-out applications within industrial control and communications subsystems.
For engineers reviewing the SN74ALVC125D datasheet, SN74ALVC125D pinout, SN74ALVC125D application, or SN74ALVC125D equivalent, key selection considerations include its 14-pin SOIC-D package, 3-state output architecture, supply voltage range (1.65–3.6 V), output drive strength, and latch-up immunity exceeding 250 mA per JESD 17.
Technical Context
The SN74ALVC125D implements four identical CMOS buffer stages, each with active-low 3-state control logic: output Y goes high-impedance when OE is high, and follows A when OE is low. Its design supports mixed-voltage system interfacing due to wide VCC tolerance and rail-to-rail input thresholds defined per VCC band (e.g., VIH = 2.0 V min at VCC = 3.0 V).
Each buffer operates with matched rise/fall times and low dynamic power consumption-typical Cpd = 19 pF at 3.3 V-and features robust ESD protection: 2000-V HBM, 200-V MM, and 1000-V CDM. Latch-up immunity exceeds 250 mA, satisfying JEDEC JESD 17 requirements for industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 3.6 V - enables interoperability across 1.8 V, 2.5 V, and 3.3 V logic domains without level shifters. |
| Max tpd | 2.8 ns at 3.3 V - supports high-speed data routing in timing-critical digital interfaces up to ~350 MHz toggle rate. |
| Output Drive | ±24 mA at 3.3 V - drives ≥10 LVTTL loads or 2–3 ALVC inputs while maintaining VOH ≥ 2.0 V and VOL ≤ 0.55 V. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max at VCC = 3.3 V - ensures noise margin >0.7 V under worst-case conditions. |
| IOZ (Off-State Leakage) | ±10 µA at 3.6 V - minimizes standby current in powered-down bus segments, critical for low-power system states. |
| ESD Rating | 2000-V HBM - meets IEC 61000-4-2 Level 2 for board-level handling and assembly robustness. |
| Latch-up Immunity | >250 mA per JESD 17 - prevents destructive latch-up during transient overvoltage events on I/O pins. |
Pinout & Package
SN74ALVC125D is housed in a 14-pin SOIC (D) package, 8.75 mm × 3.91 mm footprint, 1.75 mm max height, with 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-low control per buffer; high = high-Z output, low = enabled pass-through of A input. |
| 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 (Output) | 3-state buffered output; driven to VOH/VOL when OE low, high-impedance when OE high. |
| 7 | GND | Ground reference for all internal circuitry and I/O; must be low-impedance connection. |
| 14 | VCC | Primary power supply; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 1.65–3.6 V operation allows direct interface between 1.8 V microcontrollers and 3.3 V peripherals without external level translation. |
| High-Drive Outputs | ±24-mA drive at 3.3 V supports driving multiple downstream loads or longer PCB traces with minimal signal degradation. |
| Independent 3-State Control | Four separate OE inputs enable selective bus segmentation-e.g., isolating memory, peripheral, or sensor buses independently. |
| Low Dynamic Power | 19 pF typical power dissipation capacitance at 3.3 V reduces switching current and system-level EMI in high-frequency clock/data paths. |
| Robust ESD Protection | 2000-V HBM rating eliminates need for external ESD diodes in most industrial board layouts, reducing BOM count and layout area. |
Applications
| Industrial PLC Backplane Interface | USB Hub Signal Conditioning |
|---|---|
Use Scenario: Isolating and buffering address/data lines between CPU module and I/O expansion slots in modular programmable logic controllers. IC Role / Device Role / Timing Role: Bus buffer providing direction-controlled signal integrity and load-driving capability between 3.3 V controller and 2.5 V I/O modules. Use Value: Prevents bus contention during hot-swap events via independent OE control, while maintaining <3 ns propagation delay across full temperature range. | Use Scenario: Level-shifting and fan-out of USB 2.0 upstream/downstream control signals (e.g., RESET#, SUSPEND) in multi-port hub designs. IC Role / Device Role / Timing Role: Non-inverting 3-state repeater ensuring clean edge rates and drive strength compliance for USB specification timing windows. Use Value: Enables reliable 480 Mbps signaling by meeting USB 2.0 rise/fall time requirements (≤25 ns) with ±24 mA drive into 50 Ω loads. |
| Automotive Body Control Module | FPGA I/O Expansion Interface |
Use Scenario: Buffering LIN bus transceiver control signals and sensor status flags in body electronics units operating across -40°C to +85°C. IC Role / Device Role / Timing Role: Voltage-tolerant buffer enabling safe interfacing between 3.3 V MCU GPIOs and 12 V–compatible LIN PHY control lines. Use Value: Eliminates risk of damage from supply sequencing mismatches due to 1.65 V minimum VCC and latch-up immunity >250 mA. | Use Scenario: Expanding FPGA I/O count by driving off-chip memory, display drivers, or analog front-end ICs where native FPGA pins are insufficient. IC Role / Device Role / Timing Role: Output-enable-gated bus driver allowing dynamic reconfiguration of peripheral connections without FPGA reprogramming. Use Value: Supports hot-plug detection and partial reconfiguration by enabling/disabling individual buffers synchronously with FPGA state machine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125A | Same pinout, identical function, but lower drive (±24 mA only at VCC ≥ 2.7 V; drops to ±12 mA at 1.8 V). | Suitable for 1.8 V–3.3 V systems where full 24 mA is not required at lowest VCC. | Select SN74LVC125A if cost sensitivity outweighs need for guaranteed 24 mA at 1.65–1.95 V operation. |
| 74AUP1G125 | Single-channel, 5-pin SC70 package; 1.8–3.6 V range; max tpd = 6.2 ns at 3.0 V; ±4 mA drive. | Used for discrete point-to-point buffering rather than quad-bus consolidation; requires four devices for same functionality. | Choose 74AUP1G125 only for ultra-low-power, space-constrained designs where quad integration is unnecessary. |
Compared with SN74LVC125A and 74AUP1G125, the SN74ALVC125D delivers guaranteed ±24 mA drive down to 1.65 V and faster 2.8 ns propagation-making it optimal for high-density, mixed-voltage bus architectures requiring deterministic timing and robust drive.
Availability
SN74ALVC125D is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and FPGA-based embedded systems requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for SN74ALVC125D 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 decades of experience in high-reliability industrial and automotive components.
The SN74ALVC125D belongs to TI's ALVC (Advanced Low-Voltage CMOS) logic family, engineered for low-voltage, high-speed digital interfacing in noise-sensitive and thermally constrained environments.
FAQ
What is the recommended power supply decoupling for SN74ALVC125D?
Place a 0.1 µF ceramic capacitor between VCC (pin 14) and GND (pin 7), located within 5 mm of the SN74ALVC125D package. For systems with heavy simultaneous switching, add a 4.7 µF bulk capacitor nearby. This ensures stable operation and suppresses supply-induced noise that could trigger false outputs or increase jitter in the SN74ALVC125D signal path.
Can SN74ALVC125D operate reliably at 1.65 V supply?
Yes, SN74ALVC125D is fully specified from 1.65 V to 3.6 V. At 1.65 V, it guarantees tpd ≤ 5.3 ns, VIH ≥ 1.07 V, VIL ≤ 0.58 V, and ±4 mA output drive. All DC and AC parameters-including latch-up immunity and ESD ratings-remain valid across this full range, making SN74ALVC125D suitable for battery-powered or ultra-low-voltage systems.
How should unused inputs be handled on SN74ALVC125D?
All unused inputs-including A and OE pins-must be tied to either VCC or GND. Floating CMOS inputs can cause increased ICC, oscillation, or excessive heat. TI recommends tying unused OE pins to VCC (via pull-up) to ensure outputs remain in high-impedance state, and unused A inputs to GND or VCC depending on desired default logic level. This practice prevents undefined behavior and ensures predictable SN74ALVC125D operation.
Is SN74ALVC125D pin-compatible with SN74LVC125A?
Yes, SN74ALVC125D and SN74LVC125A share identical 14-pin SOIC (D) package, pinout, and logic function. Both feature the same terminal assignments for OE, A, Y, VCC, and GND. However, SN74ALVC125D offers superior drive strength at lower voltages and tighter timing specs-so while they are physically interchangeable, functional equivalence depends on the target VCC and load requirements of the SN74ALVC125D application.
Does SN74ALVC125D support hot insertion or live bus swapping?
SN74ALVC125D supports controlled hot insertion when OE is held high (via pull-up to VCC) during power-up and power-down sequences. This ensures outputs remain in high-impedance state until VCC stabilizes, preventing bus contention. TI recommends using a ≥10 kΩ pull-up resistor on each OE line. While not rated for uncontrolled hot-swap, this behavior makes SN74ALVC125D suitable for modular backplanes where SN74ALVC125D modules are inserted/removed under system supervision.
SN74ALVC125D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ALVC
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 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
SN74ALVC125D FAQ
1.How can I place an order for SN74ALVC125D through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ALVC125D 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 SN74ALVC125D reliable?
The price and inventory of SN74ALVC125D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ALVC125D is usually 5 days.
3.What payment methods are accepted for SN74ALVC125D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ALVC125D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ALVC125D?
SN74ALVC125D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ALVC125D 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 SN74ALVC125D?
For technical support, including SN74ALVC125D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ALVC125D requirements.
6.How does Aetrix verify that SN74ALVC125D is sourced from the original manufacturer or authorized distributors?
All SN74ALVC125D 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 SN74ALVC125D meets industry standards.
7.What is the process for return or replacement of SN74ALVC125D?
All SN74ALVC125D units undergo pre-shipment inspection (PSI). If there is an issue with SN74ALVC125D, 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 SN74ALVC125D part is unused and in its original packaging.
Return procedure for SN74ALVC125D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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