My Inquiry
My Account
Texas Instruments SN74LVTH125NSRE4
- Part No.:
- SN74LVTH125NSRE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH125NSRE4.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,682
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74LVTH125NSRE4 from Texas Instruments is a quad 3-state noninverting buffer designed for mixed-voltage bus interfacing between 3.3-V logic and 5-V TTL systems. It supports VCC down to 2.7 V, delivers 64 mA sink current per output, features bus-hold on all data inputs, and enables hot insertion via Ioff and power-up 3-state. It is used in industrial backplane interfaces and legacy system upgrades requiring level translation.
For engineers reviewing the SN74LVTH125NSRE4 datasheet, SN74LVTH125NSRE4 pinout, SN74LVTH125NSRE4 application, or SN74LVTH125NSRE4 equivalent, key selection criteria include its 3.3-V VCC operation with 5-V tolerant inputs, bus-hold elimination of external resistors, guaranteed 4.9 ns enable/disable timing at 3.3 V, and SOP-14 package compatibility with legacy PCB layouts.
Technical Context
The SN74LVTH125NSRE4 implements four independent noninverting buffers, each with an active-low 3-state output-enable (OE) control. Its bus-hold circuitry maintains valid logic states on undriven inputs without external pullup/pulldown resistors, reducing BOM count and layout complexity.
It uses TI's LVTH (Low-Voltage TTL) process to achieve TTL-compatible output drive while operating from a 3.3-V supply. The Ioff specification (±100 µA at VCC = 0) and power-up 3-state behavior ensure safe hot-insertion into live backplanes, preventing current backflow and bus contention during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 3.6 V - Enables stable operation from unregulated batteries or noisy 3.3-V rails. |
| IOL / IOH | 64 mA / −32 mA - Drives standard TTL loads directly without external buffers. |
| tPZH / tPZL | 4.9 ns / 4.9 ns max at VCC = 3.3 V - Ensures fast, predictable bus enable/disable for high-speed control signaling. |
| VIH / VIL | 2.0 V / 0.8 V - Accepts 5-V TTL input levels while powered from 3.3 V, enabling seamless mixed-mode interfacing. |
| Bus-Hold Current | ±500 µA max - Actively holds floating inputs at valid logic states, eliminating need for 10-kΩ external resistors. |
| Ioff | ±100 µA - Blocks damaging current flow when device is powered down, critical for hot-swap applications. |
| ESD Rating | 2000-V HBM - Meets industrial robustness requirements without additional protection circuitry. |
Pinout & Package
The SN74LVTH125NSRE4 is supplied in a 14-pin SOP (Small Outline Package) with 1.27-mm lead pitch and 8.75-mm body width, compliant with JEDEC MS-012AB. This surface-mount package supports automated assembly and provides thermal resistance (θJA) of 76°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Output Enable (active low) | Controls high-impedance state of corresponding buffer; tied high to disable output and reduce bus loading. |
| 1A–4A | Data Input | Accepts 5-V-tolerant TTL-level signals; internal bus-hold eliminates need for external biasing. |
| 1Y–4Y | Buffered Output | Noninverting 3-state outputs capable of driving 50-Ω transmission lines or multiple TTL inputs. |
| VCC | Power Supply | 3.3-V nominal supply; operates down to 2.7 V with full functionality and timing compliance. |
| GND | Ground Reference | Common return path for all I/O and internal logic; requires low-inductance connection for ground bounce control. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal operation | 5-V input/output voltage tolerance with 3.3-V VCC enables direct interface between legacy TTL and modern low-voltage logic. |
| Bus-hold on all data inputs | Eliminates external pullup/pulldown resistors, reducing component count, board area, and potential signal integrity issues. |
| Ioff and power-up 3-state | Prevents current backflow during hot insertion and forces outputs to high-Z during power ramp-up/down, avoiding bus conflicts. |
| Low output ground bounce (VOLP) | <0.8 V at VCC = 3.3 V ensures clean switching margins in noise-sensitive digital systems. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - guarantees robust operation in high-noise industrial environments. |
Applications
| Industrial Backplane Interface | Legacy System Upgrade |
|---|---|
Use Scenario: Interfacing a 3.3-V microcontroller to a 5-V ISA-style backplane with shared address/data bus lines. IC Role / Device Role / Timing Role: Quad noninverting buffer providing level translation and bus isolation with precise OE-controlled timing. Use Value: Enables direct connection without level-shifter ICs or discrete resistor networks, reducing latency and BOM cost. | Use Scenario: Retrofitting a 5-V PLC I/O module with a modern 3.3-V FPGA while retaining existing 5-V sensor/actuator interfaces. IC Role / Device Role / Timing Role: Bidirectional bus driver with bus-hold maintaining signal integrity during FPGA configuration gaps. Use Value: Eliminates risk of floating inputs causing spurious reads, and supports hot-swap replacement without system shutdown. |
| Hot-Swappable Card Edge | Low-Power Embedded Control |
Use Scenario: Add-on peripheral card inserted into a powered 3.3-V carrier board with shared control bus. IC Role / Device Role / Timing Role: Isolation buffer with Ioff and power-up 3-state ensuring no current injection into live bus during insertion. Use Value: Guarantees safe mechanical insertion without disrupting host controller operation or damaging connected devices. | Use Scenario: Battery-powered handheld test instrument requiring reliable 3.3-V logic interfacing with 5-V external probes. IC Role / Device Role / Timing Role: Low-voltage buffer supporting operation down to 2.7 V while maintaining TTL compatibility. Use Value: Extends usable battery life by allowing continued function through full discharge curve without logic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC125A | Lower drive strength (24 mA sink), no bus-hold, no Ioff, 1.65–3.6 V VCC range. | Suitable only for fully 3.3-V systems; cannot interface 5-V inputs without external clamping. | Select when cost and power are prioritized over mixed-voltage robustness and hot-swap capability. |
| 74ALVC124 | Higher speed (tPD ≈ 2.8 ns), 3.3-V only I/O, no bus-hold, no Ioff, 1.65–3.6 V VCC. | Requires external pullups for unused inputs; not rated for hot insertion or 5-V-tolerant operation. | Choose for high-speed, low-power 3.3-V-only designs where bus-hold and Ioff are unnecessary. |
Compared with SN74LVC125A and 74ALVC124, the SN74LVTH125NSRE4 uniquely combines 5-V-tolerant inputs, bus-hold, Ioff, and hot-swap support in a single SOP-14 package-making it the only option for legacy-to-modern bus bridging under real-world industrial conditions.
Availability
SN74LVTH125NSRE4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, legacy system upgrades, and hot-swappable peripheral modules requiring stable component supply across extended temperature ranges (−40°C to 85°C).
Supply support for SN74LVTH125NSRE4 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 for industrial, automotive, and communications markets.
The SN74LVTH125NSRE4 belongs to TI's LVTH logic family, engineered specifically for mixed-voltage bus interfacing-enabling seamless integration of 3.3-V controllers with legacy 5-V TTL infrastructure.
FAQ
What is the maximum input voltage the SN74LVTH125NSRE4 can tolerate on its data pins?
The SN74LVTH125NSRE4 supports input voltages up to 5.5 V on all data inputs (A pins) and OE pins, regardless of VCC level. This 5-V tolerance allows direct connection to legacy TTL buses without clamping diodes or level-shifting circuitry, and is explicitly specified in the recommended operating conditions table of the SCBS703I datasheet.
Does the SN74LVTH125NSRE4 require external pullup resistors on its inputs?
No, the SN74LVTH125NSRE4 does not require external pullup or pulldown resistors due to integrated bus-hold circuitry on all data inputs. This feature actively maintains a valid logic state on undriven or floating inputs, with ±500 µA dynamic hold current specified at VCC = 3.6 V. Using external resistors with bus-hold is explicitly discouraged in the datasheet.
Can the SN74LVTH125NSRE4 be used in hot-swap applications?
Yes, the SN74LVTH125NSRE4 is explicitly designed for hot-insertion applications. Its Ioff specification (±100 µA at VCC = 0) prevents damaging current backflow, and its power-up 3-state circuitry ensures outputs remain in high-impedance during power ramp-up and ramp-down-both features validated per TI's SCBS703I datasheet and application notes on hot-swap logic.
What is the thermal resistance (θJA) of the SN74LVTH125NSRE4 in its SOP-14 package?
The SN74LVTH125NSRE4 in the SOP-14 (NS) package has a junction-to-ambient thermal resistance (θJA) of 76°C/W, as documented in the "absolute maximum ratings" section of the SCBS703I datasheet. This value assumes standard JEDEC 2-layer board conditions and supports continuous operation at full drive strength within the −40°C to 85°C ambient range.
How does the bus-hold function behave when VCC is below 1.5 V?
When VCC is between 0 and 1.5 V, the SN74LVTH125NSRE4 enters a high-impedance state and bus-hold is inactive. To ensure reliable bus-hold operation, VCC must be above 1.5 V. For power-up sequencing, the datasheet recommends tying OE to VCC via a pullup resistor (minimum value determined by driver sink capability) to guarantee high-impedance until VCC stabilizes.
SN74LVTH125NSRE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 14-SOIC (0.209", 5.30mm 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-SO
SN74LVTH125NSRE4 FAQ
1.How can I place an order for SN74LVTH125NSRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH125NSRE4 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 SN74LVTH125NSRE4 reliable?
The price and inventory of SN74LVTH125NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125NSRE4 is usually 5 days.
3.What payment methods are accepted for SN74LVTH125NSRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH125NSRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH125NSRE4?
SN74LVTH125NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH125NSRE4 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 SN74LVTH125NSRE4?
For technical support, including SN74LVTH125NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125NSRE4 requirements.
6.How does Aetrix verify that SN74LVTH125NSRE4 is sourced from the original manufacturer or authorized distributors?
All SN74LVTH125NSRE4 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 SN74LVTH125NSRE4 meets industry standards.
7.What is the process for return or replacement of SN74LVTH125NSRE4?
All SN74LVTH125NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125NSRE4, 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 SN74LVTH125NSRE4 part is unused and in its original packaging.
Return procedure for SN74LVTH125NSRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74LVTH125NSRE4 Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
