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Texas Instruments SN74LVT125DRG4
- Part No.:
- SN74LVT125DRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVT125DRG4.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,920
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Product details
Overview
SN74LVT125DRG4 from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage system interfacing, supporting 5-V TTL inputs/outputs with 3.3-V VCC, operating down to 2.7 V, and featuring bus-hold inputs and Ioff protection for partial-power-down operation in industrial and embedded applications.
For engineers reviewing the SN74LVT125DRG4 datasheet, SN74LVT125DRG4 pinout, SN74LVT125DRG4 application, or SN74LVT125DRG4 equivalent, this page delivers verified electrical parameters, SOIC-14 package mapping, bus-hold behavior, output-enable timing, and real-world interface use cases - all confirmed against TI's SCBS133F datasheet and packaging addendum.
Technical Context
The SN74LVT125DRG4 implements four independent noninverting buffers, each with active-low 3-state control (OE), enabling bidirectional bus isolation. Its LVT (Low-Voltage TTL) architecture ensures compatibility with both 3.3-V logic domains and legacy 5-V TTL signal levels without level shifters.
Bus-hold circuitry actively maintains valid logic states on undriven inputs, eliminating external pullup resistors. The Ioff feature disables outputs during power-down, blocking reverse current flow when VCC = 0 V and input/output voltages range from 0 to 4.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - supports unregulated battery operation and stable low-voltage rail design |
| IOL / IOH | 64 mA sink / −32 mA source - drives heavy capacitive loads or multiple TTL inputs directly |
| tPZH, tPZL | 3.4 ns typical enable/disable delay at 3.3 V - ensures fast bus arbitration and clean state transitions |
| VIL/VIH | 0.8 V / 2.0 V - compatible with 5-V TTL input thresholds while powered from 3.3 V |
| VOHP, VOLP | <0.8 V ground bounce at VCC = 3.3 V - minimizes noise coupling in dense PCB layouts |
| Ioff | ±100 µA max at VCC = 0 - prevents backfeed current during hot-swap or partial power-down sequences |
| Bus-Hold Current | ±75 µA at VCC = 3 V - sustains valid logic levels without external biasing components |
Pinout & Package
SN74LVT125DRG4 is housed in a 14-pin SOIC (D) package per JEDEC MS-012AB, with 1.27 mm pitch, 8.75 mm × 3.91 mm body, and 1.75 mm max height - suitable for automated assembly and IPC-7351-compliant land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Output Enable (OE) | Active-low control per buffer; high = high-impedance output state |
| 2, 5, 11, 14 | Data Input (A) | Noninverting input with bus-hold; no external pullup required |
| 3, 6, 12, 9 | Buffer Output (Y) | 3-state noninverting output; driven only when OE = low |
| 7 | GND | Ground reference for all logic and output stages |
| 14 | VCC | 3.3-V supply rail; powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | Accepts 5-V TTL inputs and drives 5-V loads while powered from 3.3-V VCC, eliminating level translators |
| Integrated bus-hold | Actively holds floating inputs at valid logic levels, reducing BOM count and layout complexity |
| Ioff partial-power-down | Blocks current flow between powered and unpowered sections of a system during hot-plug or standby modes |
| Low ground bounce (VOLP) | <0.8 V at 3.3 V - improves signal integrity in multi-buffer parallel configurations |
| TTL-compatible thresholds | VIH = 2.0 V, VIL = 0.8 V - ensures reliable recognition of standard 5-V TTL signals |
Applications
| Industrial PLC Backplane Interface | Embedded Microcontroller Bus Expansion |
|---|---|
Use Scenario: Interfacing a 3.3-V ARM microcontroller to legacy 5-V I/O modules on a modular PLC rack. IC Role / Device Role / Timing Role: Level-shifting buffer isolating MCU GPIOs from noisy 5-V field-side buses while maintaining timing-critical address/data strobes. Use Value: Eliminates discrete level shifters and pullup networks, reducing board area by >12 mm² per channel and enabling direct connection to 5-V TTL peripherals. |
Use Scenario: Expanding GPIO count on a space-constrained IoT edge node using a 3.3-V SoC with limited native 5-V drive capability. IC Role / Device Role / Timing Role: Noninverting 3-state buffer enabling time-multiplexed access to shared peripheral buses (e.g., SPI flash, EEPROM, sensors). Use Value: Provides 64 mA sink capability per output, allowing direct drive of multiple 5-V logic inputs without fanout buffers or voltage translation. |
| Automotive Body Control Module | Test Equipment Digital Signal Conditioning |
Use Scenario: Isolating diagnostic communication lines (e.g., UART, LIN) between 3.3-V MCU and 5-V sensor clusters in a BCM. IC Role / Device Role / Timing Role: Bidirectional bus buffer with controlled enable timing, preventing signal contention during power sequencing. Use Value: Ioff protection ensures no backfeed into MCU during battery disconnect events, meeting ISO 16750-2 transient immunity requirements. |
Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injection into 5-V DUTs during ATE functional testing. IC Role / Device Role / Timing Role: Low-skew, high-drive buffer ensuring clean edge integrity across long test fixtures with 50-pF load capacitance. Use Value: 2.7 ns typical propagation delay (tPLH/tPHL) and <4.5 ns max enables sub-5-ns timing margins at 100-MHz test clock rates. |
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 |
|---|---|---|---|
| SN74LVTH125DR | LVT family replaced by LVTH (Low-Voltage TTL with enhanced drive); higher IOL = 12 mA typical, lower tpd = 2.1 ns, but no bus-hold | Requires external pullups on unused inputs; better for speed-critical, low-capacitance loads | Choose SN74LVTH125DR if bus-hold is unnecessary and faster switching (<2.5 ns) is prioritized over input bias simplicity. |
| SN74ALVC125DR | ALVC family: 3.3-V only I/O (no 5-V tolerance), lower VIL/VIH (0.7/1.7 V), higher Ioff leakage (±10 µA), no bus-hold | Not suitable for 5-V interface; requires full 3.3-V system co-design | Choose SN74ALVC125DR only in pure 3.3-V systems where cost and power efficiency outweigh mixed-voltage flexibility. |
Compared with SN74LVT125DRG4, SN74LVTH125DR trades bus-hold convenience for improved speed and drive strength, while SN74ALVC125DR sacrifices 5-V interface capability for lower static power and tighter logic thresholds - making SN74LVT125DRG4 uniquely suited for legacy-compatible 3.3-V-to-5-V bridging where input biasing and robustness are critical.
Availability
SN74LVT125DRG4 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and embedded test equipment requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74LVT125DRG4 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 expertise in high-reliability interface ICs and industrial-grade timing products.
The SN74LVT125DRG4 belongs to TI's LVT logic family, engineered specifically for mixed-voltage system interoperability - enabling seamless integration between modern low-voltage processors and legacy 5-V infrastructure in demanding industrial and automotive environments.
FAQ
What is the maximum input voltage the SN74LVT125DRG4 can tolerate on its A pins?
The SN74LVT125DRG4 supports input voltages up to 5.5 V on data inputs (A pins) and output-enable pins (OE), even when VCC = 3.3 V - enabling direct connection to 5-V TTL sources without clamping diodes or external protection. This is explicitly specified in the "Recommended Operating Conditions" table of the SCBS133F datasheet.
Does the SN74LVT125DRG4 require external pullup resistors on its inputs?
No, the SN74LVT125DRG4 does not require external pullup resistors because it integrates active bus-hold circuitry on all data inputs (A pins). This feature maintains a valid logic state on undriven or floating inputs, as confirmed in the Functional Description and Electrical Characteristics sections of the SCBS133F datasheet.
Can the SN74LVT125DRG4 be used in partial-power-down applications?
Yes, the SN74LVT125DRG4 supports partial-power-down operation via its Ioff circuitry: when VCC = 0 V, input/output pins tolerate voltages from 0 to 4.5 V while limiting leakage to ±100 µA - preventing damaging back-current flow. This capability is validated per JEDEC JESD-17 and documented in the Absolute Maximum Ratings and Electrical Characteristics tables.
What is the thermal performance of the SN74LVT125DRG4 in its SOIC (D) package?
The SN74LVT125DRG4 in the SOIC (D) package has a junction-to-ambient thermal resistance (θJA) of 86°C/W, as measured per JESD 51-7. This value applies under standard JEDEC 2S2P board conditions and enables reliable operation up to 85°C ambient when dissipating ≤150 mW - consistent with its typical ICC of 0.19 mA in disabled state and 7 mA under full load.
Is the SN74LVT125DRG4 pin-compatible with other members of the SN74LVT125 family?
Yes, the SN74LVT125DRG4 shares identical pinout, function, and timing with all SN74LVT125 variants in SOIC (D) packaging - including SN74LVT125D, SN74LVT125DR, and SN74LVT125D1G4 - as confirmed by TI's Package Option Addendum and the common top-side marking "LVT125". Differences are limited to packaging format (tube vs. tape-and-reel) and RoHS compliance markings.
SN74LVT125DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVT
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 32mA, 64mA
- Voltage - Supply:
- 2.7V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74LVT125DRG4 FAQ
1.How can I place an order for SN74LVT125DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVT125DRG4 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 SN74LVT125DRG4 reliable?
The price and inventory of SN74LVT125DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVT125DRG4 is usually 5 days.
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SN74LVT125DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVT125DRG4 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 SN74LVT125DRG4?
For technical support, including SN74LVT125DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVT125DRG4 requirements.
6.How does Aetrix verify that SN74LVT125DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LVT125DRG4 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 SN74LVT125DRG4 meets industry standards.
7.What is the process for return or replacement of SN74LVT125DRG4?
All SN74LVT125DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVT125DRG4, 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 SN74LVT125DRG4 part is unused and in its original packaging.
Return procedure for SN74LVT125DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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