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STMicroelectronics 74V2T125STR
- Part No.:
- 74V2T125STR
- Manufacturer:
- STMicroelectronics
- Package:
- SOT-23-8
- Datasheet:
-
74V2T125STR.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,041
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Product details
Overview
74V2T125STR from STMicroelectronics is a dual 3-state bus buffer IC designed for level-shifting and bidirectional bus isolation in mixed-voltage systems. It features dual independent buffers (1A→1Y, 2A→2Y), 3.8 ns typical propagation delay at 5 V, ±8 mA symmetrical output drive, and operates across 4.5–5.5 V with 1 µA max quiescent current - ideal for portable 3V/5V interface applications including PDAs and camcorders.
For engineers reviewing the 74V2T125STR datasheet, 74V2T125STR pinout, 74V2T125STR application, or 74V2T125STR equivalent, this page delivers verified electrical specs, SOT23-8L package mapping, real-world use cases, and validated alternative parts for voltage-level translation and bus contention control in battery-powered embedded systems.
Technical Context
The 74V2T125STR implements two independent CMOS buffer channels with active-high 3-state enable (1G, 2G), supporting simultaneous or selective bus driving. Its input tolerance (0–7 V) and power-down protection allow safe interfacing between 3 V logic and 5 V buses without external clamping.
Each channel provides matched tPLH/tPHL propagation delays (≤0.5 ns skew), symmetrical ±8 mA output drive capability, and ESD-hardened I/O (±2 kV HBM) - enabling robust operation in noisy portable environments where supply sequencing and voltage transients are common.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tPD (typ) | 3.8 ns at VCC = 5 V - enables high-speed data transfer in 20+ MHz bus systems |
| VCC Range | 4.5–5.5 V - supports industrial-grade 5 V rail with ±10% tolerance |
| IOL / IOH (min) | 8 mA - drives standard TTL loads and 50 Ω transmission lines directly |
| VIH / VIL | 2.0 V / 0.8 V - ensures reliable logic recognition from both 3 V and 5 V drivers |
| ICC (max) | 1 µA at TA = 25°C - minimizes standby power in battery-critical portable designs |
| Input Voltage Range | −0.5 to +7.0 V - allows hot-plug and overvoltage-tolerant interfacing regardless of VCC |
| ESD Rating | ±2 kV HBM - protects against handling-induced discharge in assembly and field use |
Pinout & Package
SOT23-8L (8-pin small outline transistor package), 1.95 mm pitch, 3.0 × 2.8 mm body, 0.55 mm max height - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7 | 1G, 2G - Output Enable Inputs | Active-HIGH enables respective buffer; HIGH = high-Z output, LOW = pass-through |
| 2, 5 | 1A, 2A - Data Inputs | CMOS-compatible inputs accepting 0–7 V; tolerant of floating or off-rail states |
| 3, 6 | 1Y, 2Y - Data Outputs | 3-state CMOS outputs with symmetrical drive strength and power-down leakage < 5 µA |
| 4 | GND | Reference ground terminal; must be connected before VCC for proper ESD path |
| 8 | VCC | Positive supply (4.5–5.5 V); powers internal logic and output stage |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Control | Dual independent active-HIGH enables allow selective bus arbitration without external logic |
| Wide Input Voltage Tolerance | Accepts 0–7 V on all inputs - eliminates need for level shifters when interfacing 3 V microcontrollers to 5 V peripherals |
| Power-Down Protection | Inputs/outputs remain high-Z and non-latching during VCC = 0 - prevents backfeeding and bus contention |
| Matched Propagation Delays | tPLH ≈ tPHL ≤ 0.5 ns skew - preserves signal integrity in synchronous parallel bus transfers |
| Low Quiescent Current | 1 µA max ICC at 25°C - extends battery life in always-on portable subsystems |
Applications
| Personal Digital Assistant (PDA) | Camcorder Interface Module |
|---|---|
Use Scenario: Isolating 3.3 V ARM processor address/data bus from 5 V legacy peripheral controller. IC Role / Device Role / Timing Role: Dual 3-state buffer providing voltage-tolerant, direction-controlled bus coupling with sub-4 ns timing. Use Value: Eliminates external level translators while maintaining signal fidelity and reducing BOM count by one IC. | Use Scenario: Enabling/disabling video data lanes between image sensor and 5 V encoder ASIC during power-save mode. IC Role / Device Role / Timing Role: Bus buffer with power-down protection ensures no leakage current flows into unpowered encoder during sleep. Use Value: Reduces system standby current by >95% compared to standard 74-series buffers lacking power-down I/O. |
| Battery-Powered Test Equipment | Industrial Handheld Scanner |
Use Scenario: Multiplexing multiple sensor ADC outputs onto shared 5 V SPI bus under microcontroller control. IC Role / Device Role / Timing Role: Dual buffer acts as programmable bus gate with independent enable pins for per-channel selection. Use Value: Enables deterministic channel switching with <7.5 ns disable time - critical for synchronized multi-sensor sampling. | Use Scenario: Interfacing 3 V barcode scanner engine with 5 V host MCU UART and GPIO lines. IC Role / Device Role / Timing Role: Level-translating buffer with ESD-hardened I/O for rugged handheld operation. Use Value: Withstands repeated electrostatic discharge in field use without latch-up or parameter drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 3-state bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC2T45DCUR | Auto-direction sensing, dual-supply (1.65–5.5 V), 32 mA drive, 3.5 ns tPD | Requires separate VCCA/VCCB rails; better for bidirectional I²C/SPI, less suited for fixed-direction bus gating | Select when automatic direction control and higher drive are needed; avoid if only unidirectional enable control is required |
| 74LCX245MTCX | Octal (not dual), 3.3 V only, 24 mA drive, 5.2 ns tPD, TSSOP-20 package | Higher channel count but larger footprint and incompatible voltage range - not drop-in for SOT23-8L space-constrained designs | Choose only when scaling to 8-bit buses and board area permits TSSOP-20; unsuitable for portable miniaturization |
Compared with SN74LVC2T45DCUR and 74LCX245MTCX, the 74V2T125STR uniquely combines SOT23-8L compactness, 0–7 V input tolerance, and ultra-low 1 µA standby current - making it irreplaceable for space- and battery-limited dual-channel 3V/5V isolation where direction is software-controlled and not data-dependent.
Availability
74V2T125STR is available at Aetrix Electronics and suitable for personal digital assistants, camcorders, and battery-powered test equipment requiring stable component supply and long-term obsolescence management.
Supply support for 74V2T125STR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.
The 74V2T125STR belongs to ST's high-speed CMOS logic family, engineered specifically for low-power, mixed-voltage interface applications in portable and battery-operated systems.
FAQ
Is the 74V2T125STR still in active production?
No - STMicroelectronics has marked the 74V2T125STR as obsolete per official product change notices. However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support, including last-time buy planning and cross-reference engineering assistance for migration paths.
Can the 74V2T125STR safely interface a 3.3 V FPGA with a 5 V EEPROM?
Yes - its inputs accept 0–7 V regardless of VCC, and outputs swing rail-to-rail within 5 V. With VCC = 5 V, VIH = 2.0 V (min) and VIL = 0.8 V (max) ensure reliable recognition of 3.3 V logic levels, while ±8 mA drive meets EEPROM write-current requirements.
What is the maximum capacitive load the 74V2T125STR can drive reliably?
The device is characterized up to 50 pF (CL), with tPLH/tPHL increasing from 3.8 ns (15 pF) to 4.3 ns (50 pF) at VCC = 5 V. For stable operation beyond 50 pF, add series termination or reduce edge rate; layout parasitics should be minimized to maintain sub-5 ns timing.
Does the 74V2T125STR require external pull-up or pull-down resistors on enable inputs?
No - the 1G/2G inputs have CMOS-compatible thresholds and negligible leakage (<1 µA). Pull-ups are unnecessary unless system-level noise immunity requires forced default state; floating enables will hold last logic state but are not recommended for production due to potential metastability during power ramp.
74V2T125STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74V
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
74V2T125STR FAQ
1.How can I place an order for 74V2T125STR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74V2T125STR 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 74V2T125STR reliable?
The price and inventory of 74V2T125STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74V2T125STR is usually 5 days.
3.What payment methods are accepted for 74V2T125STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74V2T125STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74V2T125STR?
74V2T125STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74V2T125STR 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 74V2T125STR?
For technical support, including 74V2T125STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74V2T125STR requirements.
6.How does Aetrix verify that 74V2T125STR is sourced from the original manufacturer or authorized distributors?
All 74V2T125STR 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 74V2T125STR meets industry standards.
7.What is the process for return or replacement of 74V2T125STR?
All 74V2T125STR units undergo pre-shipment inspection (PSI). If there is an issue with 74V2T125STR, 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 74V2T125STR part is unused and in its original packaging.
Return procedure for 74V2T125STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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