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Texas Instruments SN74LV125AD
- Part No.:
- SN74LV125AD
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LV125AD.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,979
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Product details
Overview
SN74LV125AD from Texas Instruments is a quadruple 3-state bus buffer gate designed for level-shifting and bus isolation in mixed-voltage systems. It operates from 2 V to 5.5 V, delivers ≤6 ns propagation delay at 5 V, supports 5.5-V-tolerant inputs, and features Ioff for partial-power-down mode. It is used in enterprise SSDs and PoE power management interfaces where controlled output enable sequencing and ground-bounce suppression are critical.
For engineers reviewing the SN74LV125AD datasheet, SN74LV125AD pinout, SN74LV125AD application, or SN74LV125AD equivalent, this page provides verified functional identity, SOIC-14 package mapping, confirmed 3-state switching behavior, real-world noise immunity specs (VOLP < 0.8 V at 3.3 V), and two validated alternative parts with documented functional and application differences.
Technical Context
The SN74LV125AD implements four independent noninverting buffers, each with an active-low 3-state output enable (OE). Each channel operates as a voltage-level translator: inputs tolerate up to 5.5 V regardless of VCC, enabling down-translation from 5-V logic to 3.3-V or 2.5-V buses. The Ioff feature disables all outputs and isolates I/O when VCC = 0, preventing back-drive current during hot insertion.
Its low drive strength (±8 mA at 3 V) and controlled edge rates (Δt/Δv ≥ 100 ns/V at 3.3 V) minimize signal ringing and undershoot (VOHV > 2.3 V) on lightly loaded lines. Latch-up immunity exceeds 250 mA per JESD 17, and ESD protection meets 4000-V HBM, making it suitable for industrial control and motor drive I/O conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - enables interoperability across 2.5-V, 3.3-V, and 5-V logic domains without level shifters. |
| tpd (max) | 6 ns at VCC = 5 V, CL = 15 pF - ensures timing-critical bus buffering in high-speed digital subsystems. |
| Input Voltage Tolerance | Up to 5.5 V on all inputs - allows safe interfacing with higher-voltage controllers while powered from lower VCC. |
| Ioff | ≤5 µA at VCC = 0 - guarantees isolation during partial power-down, preventing current leakage between unpowered and active sections. |
| VOLP / VOHV | < 0.8 V / > 2.3 V at VCC = 3.3 V - reduces ground bounce and output undershoot, improving signal integrity on shared PCB traces. |
| Operating Temperature | –40°C to +125°C - supports deployment in extended-temperature industrial environments including motor drives and PLCs. |
| ESD Rating (HBM) | ±4000 V - meets industrial-grade robustness requirements for handling and board-level reliability. |
Pinout & Package
SN74LV125AD is supplied in a 14-pin SOIC (D) package measuring 8.65 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and 1.27-mm pitch. This surface-mount package supports automated assembly and offers thermal resistance RθJA = 92.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low output enable controls - each independently disables its associated buffer's output to high-impedance state. |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - accept 5.5-V-tolerant logic signals and pass through noninverted to corresponding Y outputs. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Buffer output terminals - drive loads with 3-state capability; high-impedance when OE = high. |
| 7 | GND | Ground reference for all internal circuitry and output stage return path. |
| 14 | VCC | Single positive supply rail - powers all four buffers and defines logic thresholds and output voltage levels. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage operation | Inputs accept up to 5.5 V while VCC is as low as 2 V - eliminates external level translators in multi-rail systems like SSD controllers. |
| Ioff partial-power-down support | Blocks current flow between powered and unpowered sections - essential for hot-plug capable industrial backplanes and modular I/O cards. |
| Low-noise output drive | Controlled slew rate limits dI/dt, reducing VOLP (< 0.8 V) and VOHV (> 2.3 V) - prevents false triggering in adjacent sensitive analog or RF circuits. |
| High latch-up immunity | Exceeds 250 mA per JESD 17 - ensures robust operation under transient overvoltage or ground-shift conditions in motor drive gate driver interfaces. |
| Industrial temperature range | Rated from –40°C to +125°C - qualified for continuous operation in programmable logic controllers and PoE-powered equipment enclosures. |
Applications
| Enterprise SSD Interconnect | Power over Ethernet (PoE) Interface |
|---|---|
Use Scenario: Isolating NAND flash command/address buses from host controller logic operating at different voltage levels. IC Role / Device Role / Timing Role: Level-translating 3-state buffer that enables/disables data paths during flash programming or standby modes. Use Value: Prevents bus contention during power sequencing and suppresses ground bounce that could corrupt data writes in high-density SSD modules. |
Use Scenario: Conditioning control signals between IEEE 802.3af/at PD interface ICs and microcontroller-based power management units. IC Role / Device Role / Timing Role: Bidirectional signal conditioner with independent OE control for status reporting and fault signaling lines. Use Value: Ensures clean, glitch-free enable/disable transitions during PoE classification and power-up/down sequences, avoiding misclassification events. |
| Programmable Logic Controller (PLC) I/O Module | Motor Drive Control Logic |
Use Scenario: Buffering discrete input signals from field sensors (e.g., limit switches, proximity sensors) into isolated microcontroller inputs. IC Role / Device Role / Timing Role: Input signal conditioner with 3-state capability for multiplexed diagnostics and configuration readback. Use Value: Provides 5.5-V-tolerant inputs and Ioff isolation to prevent back-driving during module replacement or firmware updates. |
Use Scenario: Driving gate driver enable/disable signals in multi-phase inverter stages where timing skew must be minimized. IC Role / Device Role / Timing Role: Low-skew, low-noise buffer for distributing PWM enable commands across parallel half-bridge drivers. Use Value: Delivers ≤6 ns tpd and tight output matching (tsk(o) ≤ 1 ns) to maintain precise phase alignment between inverter legs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125A | Lower VCC min (1.65 V), faster tpd (4.2 ns @ 3.3 V), but no 5.5-V input tolerance - requires external clamping if interfacing >3.3-V sources. | Preferred in 1.8-V/3.3-V-only systems; unsuitable for legacy 5-V sensor interfacing without redesign. | Select SN74LVC125A only when full 5.5-V input tolerance is not required and tighter timing margins are needed. |
| 74AHC125 | Wider VCC range (2 V–5.5 V), identical pinout, but lacks Ioff and has higher drive (±8 mA vs ±24 mA), increasing EMI risk. | Better for high-speed clock distribution; less suitable for hot-swap or partial-power-down scenarios due to missing Ioff. | Choose 74AHC125 when maximum speed is prioritized and system-level power sequencing is fully controlled externally. |
Compared with SN74LVC125A and 74AHC125, SN74LV125AD uniquely balances 5.5-V input tolerance, Ioff-enabled hot-swap capability, and low-noise drive - making it the optimal choice for mixed-voltage industrial I/O where robustness and signal integrity outweigh raw speed.
Availability
SN74LV125AD is available at Aetrix Electronics and suitable for enterprise SSD interconnect, Power over Ethernet (PoE) interface, and programmable logic controller (PLC) I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74LV125AD 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 specializing in analog and embedded processing technologies, with decades of leadership in logic IC design and industrial-grade reliability validation.
The SN74LV125AD belongs to TI's LV family of low-voltage CMOS logic devices, engineered specifically for robust mixed-signal interfacing in industrial automation, communications infrastructure, and automotive-qualified systems.
FAQ
What is the maximum propagation delay of SN74LV125AD at 3.3 V?
The maximum propagation delay (tpd) of SN74LV125AD is 11 ns at VCC = 3.3 V, CL = 15 pF, and TA = –40°C to +125°C. At 25°C, the typical value is 4.8 ns. This delay is measured from input transition (50% VCC) to output transition (50% VCC) under specified load conditions, and applies uniformly across all four channels of the SN74LV125AD.
Does SN74LV125AD support 5-V tolerant inputs when powered from 3.3 V?
Yes, SN74LV125AD supports input voltages up to 5.5 V regardless of VCC level - including when powered from 3.3 V. This 5-V tolerance is explicitly guaranteed in the datasheet's Recommended Operating Conditions table and enables direct interfacing with legacy 5-V microcontrollers or sensors without external level-shifting circuitry, a key feature of the SN74LV125AD.
What is the purpose of the Ioff feature in SN74LV125AD?
The Ioff feature in SN74LV125AD disables all outputs and blocks current flow when VCC = 0 V, preventing back-drive current from live system buses into an unpowered device. This enables safe hot insertion and partial-power-down operation - critical for modular PLC I/O cards and enterprise SSD hot-swap architectures using the SN74LV125AD.
Can SN74LV125AD be used in automotive applications?
The standard SN74LV125AD is not qualified for automotive use. However, Texas Instruments offers the pin-compatible SN74LV125A-Q1 variant, which is AEC-Q100 qualified for automotive applications. For automotive designs requiring the same functionality, SN74LV125A-Q1 - not SN74LV125AD - must be selected to meet reliability and qualification requirements.
What package type is SN74LV125AD supplied in?
SN74LV125AD is supplied in a 14-pin SOIC (D) package with dimensions 8.65 mm × 3.90 mm and 1.27-mm lead pitch. This JEDEC-standard package is compatible with automated SMT assembly and provides RθJA = 92.7°C/W, supporting reliable thermal performance in industrial PCB layouts where the SN74LV125AD is deployed.
SN74LV125AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LV
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 16mA, 16mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LV125AD FAQ
1.How can I place an order for SN74LV125AD through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LV125AD 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 SN74LV125AD reliable?
The price and inventory of SN74LV125AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LV125AD is usually 5 days.
3.What payment methods are accepted for SN74LV125AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LV125AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LV125AD?
SN74LV125AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LV125AD 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 SN74LV125AD?
For technical support, including SN74LV125AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LV125AD requirements.
6.How does Aetrix verify that SN74LV125AD is sourced from the original manufacturer or authorized distributors?
All SN74LV125AD 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 SN74LV125AD meets industry standards.
7.What is the process for return or replacement of SN74LV125AD?
All SN74LV125AD units undergo pre-shipment inspection (PSI). If there is an issue with SN74LV125AD, 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 SN74LV125AD part is unused and in its original packaging.
Return procedure for SN74LV125AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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