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Texas Instruments SN74LVTH125NSR
- Part No.:
- SN74LVTH125NSR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74LVTH125NSR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 14SOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74LVTH125NSR 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 on all data inputs to eliminate external pull resistors. It enables hot insertion in backplane or modular systems via Ioff and power-up 3-state logic.
For engineers reviewing the SN74LVTH125NSR datasheet, SN74LVTH125NSR pinout, SN74LVTH125NSR application, or SN74LVTH125NSR equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V signal tolerance, bus-hold input retention, output drive strength (64 mA sink), thermal resistance (76°C/W), and SOP-14 package footprint for legacy board compatibility.
Technical Context
The SN74LVTH125NSR implements four independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Its bus-hold circuitry actively maintains valid logic states on undriven inputs without external components, reducing BOM count and layout complexity.
It supports hot-insertion through dual protection mechanisms: Ioff disables outputs when VCC = 0 V to prevent current backflow, while power-up 3-state ensures outputs remain high-impedance during VCC ramp (0–1.5 V), avoiding 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 across unregulated battery supplies and low-noise 3.3-V rails. |
| IOL (Max) | 64 mA - Sinks sufficient current to drive multiple TTL loads or moderate-capacitance buses without external buffering. |
| tPLH/tPHL | 1 ns to 4.5 ns @ VCC = 3.3 V - Ensures sub-5 ns propagation delay for high-speed address/data buffering in 33-MHz PCI-style interfaces. |
| Bus-Hold Current | ±75 µA @ VCC = 3 V - Provides robust input state retention without external resistors, simplifying termination on unterminated stubs. |
| θJA | 76°C/W - Confirmed thermal resistance for SOP-14 package, enabling reliable operation at 70°C ambient with typical 5-mA ICC draw. |
| Ioff | ±100 µA @ VCC = 0 V - Blocks damaging back-current during live insertion, meeting hot-swap safety requirements. |
| VI (Max) | 5.5 V - Accepts 5-V TTL-level inputs directly while powered from 3.3-V supply, eliminating level-shifters. |
Pinout & Package
SOP-14 (NS) package: 14-pin small-outline plastic package, 8.1 mm × 10.4 mm body, 1.27 mm pitch, 1.75 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Output-enable control input | Active-low enables corresponding buffer output; high forces high-impedance state for bus sharing. |
| 1A–4A | Data input | Noninverting input for each buffer; features integrated bus-hold to retain logic state when floating. |
| 1Y–4Y | Buffered output | 3-state noninverting output capable of sinking 64 mA or sourcing 32 mA at VCC = 3.3 V. |
| VCC | Power supply | 3.3-V nominal supply; supports operation down to 2.7 V for battery-backed systems. |
| GND | Ground reference | Signal and power ground return; must be low-impedance for stable bus-hold and output switching. |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode signal interface | Accepts 5-V TTL inputs and drives 5-V TTL loads while powered from 3.3-V VCC, eliminating level translators in 3.3-V/5-V hybrid systems. |
| Integrated bus-hold | Eliminates need for 4.7-kΩ external pullup/pulldown resistors on all 8 data lines (4A + 4Y), reducing component count and PCB area. |
| Hot-insertion support | Ioff and power-up 3-state prevent bus conflicts and back-current damage during live module replacement in telecom or industrial backplanes. |
| Low ground bounce | VOLP < 0.8 V @ VCC = 3.3 V - Minimizes noise coupling into shared ground planes during high-current output transitions. |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - Ensures robustness against transient-induced latch-up in noisy industrial environments. |
Applications
| PCI Bus Interface | Industrial Backplane Buffering |
|---|---|
Use Scenario: Isolating 3.3-V controller signals from legacy 5-V PCI slot data/address lines in embedded PC/104 systems. IC Role / Device Role / Timing Role: Quad noninverting buffer providing voltage-level translation and bus isolation between mismatched logic families. Use Value: Eliminates discrete level shifters and pull resistors, reducing BOM cost by $0.12/unit and saving 28 mm² PCB area per device. | Use Scenario: Driving shared control bus in modular PLC I/O chassis where modules are inserted/removed under power. IC Role / Device Role / Timing Role: Hot-plug-safe 3-state buffer enabling dynamic reconfiguration of distributed I/O timing signals. Use Value: Prevents bus contention during insertion via Ioff and power-up 3-state, ensuring uninterrupted operation of active modules. |
| Memory Address Latching | Legacy Microcontroller Expansion |
Use Scenario: Buffering address lines from a 3.3-V ARM microcontroller to 5-V SRAM or EPROM in retro-computing or instrumentation designs. IC Role / Device Role / Timing Role: Low-skew, noninverting address driver with bus-hold to maintain valid addresses during CPU wait states. Use Value: Maintains stable memory addressing during low-power modes without external hold circuitry, improving system reliability. | Use Scenario: Expanding GPIO count of a 3.3-V MCU to interface with 5-V peripheral ICs (e.g., DACs, ADCs, displays) in test equipment. IC Role / Device Role / Timing Role: Bidirectional signal conditioner enabling 5-V tolerant input capture and 5-V compatible output drive. Use Value: Allows direct connection to legacy 5-V peripherals without additional voltage translation, accelerating prototyping cycles. |
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 |
|---|---|---|---|
| SN74LVC125DR | No bus-hold; requires external pull resistors; lower drive (24 mA sink); 1.65–3.6 V VCC. | Suitable only where inputs are always driven; not viable for floating-bus or hot-swap use cases. | Select SN74LVC125DR only if bus-hold is unnecessary and lower power consumption is prioritized over interface robustness. |
| 74ALVC125MTCX | Higher speed (tPD = 2.5 ns typ), no bus-hold, 1.65–3.6 V VCC, TSSOP-14 package. | Optimized for high-frequency digital logic but lacks hot-insertion protection and bus-hold for undriven nodes. | Choose 74ALVC125MTCX when maximum speed is critical and system design guarantees always-driven inputs and controlled power sequencing. |
Compared with SN74LVC125DR and 74ALVC125MTCX, the SN74LVTH125NSR uniquely combines 5-V-tolerant inputs, integrated bus-hold, and Ioff-based hot-swap capability-making it the only option among the three qualified for legacy bus interfacing with uncontrolled signal states.
Availability
SN74LVTH125NSR is available at Aetrix Electronics and suitable for industrial backplane interfacing, legacy memory expansion, and modular control system design requiring stable component supply and long-term obsolescence management.
Supply support for SN74LVTH125NSR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH125NSR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system bridging-enabling seamless interoperability between 3.3-V controllers and 5-V legacy peripherals in space-constrained industrial and telecom equipment.
FAQ
What is the recommended operating voltage range for the SN74LVTH125NSR?
The SN74LVTH125NSR is specified for continuous operation from 2.7 V to 3.6 V on VCC. Operation below 2.7 V may result in undefined output states or increased propagation delay; above 3.6 V risks exceeding absolute maximum ratings. The device supports down to 2.7 V to accommodate aging batteries or unregulated supplies in portable industrial tools.
Does the SN74LVTH125NSR require external pullup or pulldown resistors on its inputs?
No, the SN74LVTH125NSR includes active bus-hold circuitry on all data inputs (1A–4A), which maintains valid logic states without external resistors. Using pullup/pulldown resistors with bus-hold enabled is explicitly discouraged in the datasheet, as it can cause excessive current draw and logic instability.
Can the SN74LVTH125NSR safely interface a 3.3-V microcontroller with 5-V peripherals?
Yes-the SN74LVTH125NSR accepts 5-V TTL-level inputs while powered from 3.3 V and drives 5-V-compatible outputs, making it ideal for interfacing 3.3-V MCUs with legacy 5-V peripherals such as EEPROMs, LCD controllers, or industrial sensors without external level shifters.
What thermal performance should be expected from the SN74LVTH125NSR in SOP-14 package?
The SN74LVTH125NSR in SOP-14 (NS) package has a specified junction-to-ambient thermal resistance (θJA) of 76°C/W. At typical operating conditions (VCC = 3.3 V, ICC ≈ 5 mA), junction temperature rise remains under 0.4°C-well within safe limits for industrial ambient temperatures up to 85°C.
How does the SN74LVTH125NSR support hot insertion in modular systems?
The SN74LVTH125NSR supports hot insertion via two mechanisms: Ioff circuitry disables outputs when VCC = 0 V to block back-current, and power-up 3-state holds outputs high-impedance until VCC exceeds 1.5 V-preventing bus conflicts during live module insertion into powered backplanes.
SN74LVTH125NSR 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:
- 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:
- 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
SN74LVTH125NSR FAQ
1.How can I place an order for SN74LVTH125NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH125NSR 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 SN74LVTH125NSR reliable?
The price and inventory of SN74LVTH125NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125NSR is usually 5 days.
3.What payment methods are accepted for SN74LVTH125NSR?
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4.How is shipping managed for SN74LVTH125NSR?
SN74LVTH125NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH125NSR 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 SN74LVTH125NSR?
For technical support, including SN74LVTH125NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125NSR requirements.
6.How does Aetrix verify that SN74LVTH125NSR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH125NSR 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 SN74LVTH125NSR meets industry standards.
7.What is the process for return or replacement of SN74LVTH125NSR?
All SN74LVTH125NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125NSR, 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 SN74LVTH125NSR part is unused and in its original packaging.
Return procedure for SN74LVTH125NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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