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Texas Instruments SN74LVTH125DR
- Part No.:
- SN74LVTH125DR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LVTH125DR.pdf
- Description:
- IC BUF NON-INVERT 3.6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
SN74LVTH125DR 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, features bus-hold on all data inputs, Ioff for hot insertion, and delivers 64 mA sink current per output at 3.3 V - enabling robust signal integrity in industrial backplane and legacy interface applications.
For engineers reviewing the SN74LVTH125DR datasheet, SN74LVTH125DR pinout, SN74LVTH125DR application, or SN74LVTH125DR equivalent, key selection criteria include its 3.3-V supply compatibility with 5-V tolerant inputs, independent 3-state control per channel, bus-hold circuitry eliminating external resistors, and SOIC-14 packaging suitable for high-density PCB layouts.
Technical Context
The SN74LVTH125DR implements four independent noninverting buffers, each with dedicated active-low output-enable (OE) control. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and 5-V tolerant inputs allow seamless connection to legacy 5-V buses while operating from a 3.3-V supply.
Power-up 3-state and Ioff circuitry ensure outputs remain high-impedance during power ramping or when VCC = 0, preventing backdrive current and enabling safe hot-plug operation in modular systems. Bus-hold circuitry actively maintains valid logic states on undriven inputs without external pull resistors.
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 - sufficient drive strength for TTL loads and stubbed backplanes |
| Input Voltage Tolerance | Up to 5.5 V - allows direct connection to 5-V logic without level-shifting components |
| tPLH / tPHL | Typ. 3.5 ns at VCC = 3.3 V - supports >100 MHz bus signaling with low propagation skew |
| Bus-Hold Current | ±75 µA at VCC = 3 V - actively holds floating inputs at valid logic levels, eliminating BOM cost of pull resistors |
| Ioff | ±100 µA at VCC = 0 - blocks damaging backflow current during hot insertion or partial power-down |
| ESD Rating | 2000-V HBM, 200-V MM - meets industrial-grade ESD robustness requirements |
Pinout & Package
SN74LVTH125DR is housed in a 14-pin SOIC (D) package measuring 8.75 mm × 3.91 mm × 1.75 mm, with standard 1.27-mm lead pitch and RoHS-compliant NiPdAu finish. The package is rated MSL Level-1 (unlimited floor life) and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Independent control per buffer; high = high-Z output, low = enabled noninverting pass-through |
| 1A–4A | Data inputs | TTL-compatible inputs with bus-hold; accept 0–5.5 V regardless of VCC |
| 1Y–4Y | Buffered outputs | 3-state CMOS outputs capable of 64 mA sink/32 mA source into 5-V loads |
| VCC | Supply rail | 3.3-V nominal supply; operates down to 2.7 V with full functionality |
| GND | Ground reference | Signal and power return; decoupling capacitor required within 10 mm of pin 7 |
Key Features
| Feature | Design Value |
|---|---|
| Mixed-mode voltage interface | 3.3-V VCC operation with 5-V tolerant inputs enables direct bridging between LV and legacy TTL buses |
| Bus-hold circuitry | Eliminates need for 10-kΩ external pullup/pulldown resistors on data lines, reducing BOM count and board space |
| Hot-insertion support | Ioff and power-up 3-state prevent backdrive current and bus conflicts during live module replacement |
| Low ground bounce | VOLP < 0.8 V at VCC = 3.3 V ensures clean signal edges under heavy capacitive loading |
| Latch-up immunity | Exceeds 500 mA per JESD 17 - robust against transient-induced latch-up in noisy environments |
Applications
| Industrial Backplane Interface | Legacy System Upgrades |
|---|---|
Use Scenario: Interfacing modern 3.3-V FPGA I/O banks to legacy 5-V VMEbus or ISA-style backplanes. IC Role / Device Role / Timing Role: Quad noninverting buffer providing level translation and drive strength matching for multi-drop bus segments. Use Value: Eliminates discrete level shifters and reduces layout complexity while maintaining signal integrity across long traces. | Use Scenario: Retrofitting aging test equipment control boards with newer 3.3-V microcontrollers without redesigning entire I/O subsystems. IC Role / Device Role / Timing Role: Signal repeater and voltage translator for address/data/control lines between 5-V peripherals and 3.3-V host logic. Use Value: Enables drop-in replacement of obsolete 74ACT or 74F parts using existing PCB footprints and routing. |
| Modular Hot-Swap Subsystems | Automated Test Equipment (ATE) |
Use Scenario: Supporting field-replaceable modules in programmable logic controllers where cards may be inserted while system remains powered. IC Role / Device Role / Timing Role: Isolation buffer with Ioff and power-up 3-state ensuring no bus contention during insertion/removal sequences. Use Value: Prevents system lockups and protects upstream drivers from backfeed current during hot-swap events. | Use Scenario: Driving multiple parallel DUT (device-under-test) interface lines from a single controller card in semiconductor ATE racks. IC Role / Device Role / Timing Role: Fanout buffer distributing synchronized control signals (e.g., START, RESET) to up to four DUT sites. Use Value: Maintains tight timing skew (<0.5 ns between channels) and provides margin for capacitive loading across long ribbon cables. |
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 | Lower drive (24 mA IOL), no bus-hold, 5-V tolerant inputs only up to 5.5 V (not guaranteed for TTL-level noise margins) | Suitable for low-power, low-noise 3.3-V-only systems; not recommended for legacy 5-V bus interfacing | Select SN74LVC125DR only if bus-hold and 5-V TTL compatibility are unnecessary and lower ICC is prioritized. |
| SN74AHCT125DR | 5-V supply only (VCC = 4.5–5.5 V), higher propagation delay (~8 ns), no Ioff or bus-hold | Designed for pure 5-V environments; requires external pull resistors and cannot operate from 3.3-V rails | Choose SN74AHCT125DR only when upgrading legacy 5-V designs and 3.3-V compatibility is irrelevant. |
Compared with SN74LVC125DR and SN74AHCT125DR, the SN74LVTH125DR uniquely combines 3.3-V operation, 5-V tolerant inputs with TTL thresholds, integrated bus-hold, and Ioff - making it the sole option among these three for mixed-voltage hot-swap backplane interfaces.
Availability
SN74LVTH125DR is available at Aetrix Electronics and suitable for industrial backplane interface, legacy system upgrades, modular hot-swap subsystems, and automated test equipment requiring stable component supply and long-term manufacturability.
Supply support for SN74LVTH125DR 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 solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74LVTH125DR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interfacing - delivering TTL-compatible performance from 3.3-V supplies while supporting legacy 5-V infrastructure.
FAQ
What is the maximum input voltage rating for SN74LVTH125DR?
The SN74LVTH125DR supports input voltages up to 5.5 V across its data and control pins, independent of VCC. This 5-V tolerance enables direct connection to legacy TTL buses without external level-shifting circuitry, and is explicitly specified in the Absolute Maximum Ratings table of the SCBS703I datasheet.
Does SN74LVTH125DR require external pullup resistors on its inputs?
No, SN74LVTH125DR does not require external pullup or pulldown resistors because it integrates active bus-hold circuitry on all data inputs (1A–4A). This feature maintains valid logic states on undriven or floating inputs, and the datasheet explicitly warns against using external resistors with bus-hold enabled.
Can SN74LVTH125DR be used in hot-swap applications?
Yes, SN74LVTH125DR is explicitly designed for hot-insertion use cases. Its Ioff circuitry disables outputs when VCC = 0, preventing damaging backflow current, and its power-up 3-state function ensures outputs remain high-impedance during power ramping - both confirmed in the Functional Description and Applications sections of SCBS703I.
What is the typical propagation delay of SN74LVTH125DR at 3.3 V?
The typical propagation delay (tPLH/tPHL) of SN74LVTH125DR is 3.5 ns at VCC = 3.3 V and TA = 25°C, as measured under CL = 50 pF load conditions. This value is specified in the Switching Characteristics table of the SCBS703I datasheet and reflects consistent performance across all four channels.
Which package type is used by SN74LVTH125DR?
SN74LVTH125DR uses the SOIC (D) package: a 14-pin small-outline integrated circuit with 1.27-mm lead pitch, 8.75-mm body length, and 3.91-mm body width. This package is RoHS-compliant, MSL Level-1 rated, and documented in TI's D0014A mechanical drawing and PACKAGE OPTION ADDENDUM.
SN74LVTH125DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LVTH
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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-SOIC
SN74LVTH125DR FAQ
1.How can I place an order for SN74LVTH125DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LVTH125DR 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 SN74LVTH125DR reliable?
The price and inventory of SN74LVTH125DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LVTH125DR is usually 5 days.
3.What payment methods are accepted for SN74LVTH125DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LVTH125DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LVTH125DR?
SN74LVTH125DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LVTH125DR 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 SN74LVTH125DR?
For technical support, including SN74LVTH125DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LVTH125DR requirements.
6.How does Aetrix verify that SN74LVTH125DR is sourced from the original manufacturer or authorized distributors?
All SN74LVTH125DR 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 SN74LVTH125DR meets industry standards.
7.What is the process for return or replacement of SN74LVTH125DR?
All SN74LVTH125DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LVTH125DR, 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 SN74LVTH125DR part is unused and in its original packaging.
Return procedure for SN74LVTH125DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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