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STMicroelectronics 74V1G126STR
- Part No.:
- 74V1G126STR
- Manufacturer:
- STMicroelectronics
- Package:
- SC-74A, SOT-753
- Datasheet:
-
74V1G126STR.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,122
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Product details
Overview
74V1G126STR from STMicroelectronics is a single-channel 3-state bus buffer with CMOS logic interface, designed for voltage-level translation between 3V and 5V systems. It features 3.4ns typical propagation delay at 5V, ±8mA symmetrical output drive, 2V–5.5V operating supply range, and input tolerance up to 7V independent of VCC - enabling robust I/O interfacing in mixed-voltage embedded control applications.
For engineers reviewing the 74V1G126STR datasheet, 74V1G126STR pinout, 74V1G126STR application, or 74V1G126STR equivalent, key selection criteria include 3-state enable timing (tPZH/tPLZ), high-noise-immunity input thresholds (VIH/VIL = 0.7VCC/0.3VCC), power-down input protection, and SOT23-5L package compatibility with space-constrained PCB layouts.
Technical Context
This device implements a single non-inverting buffer with active-low 3-state enable (1G). Its C2MOS process enables rail-to-rail input tolerance (–0.5V to +7V), allowing safe operation during power sequencing or hot-swap conditions without external clamping.
The output stage delivers matched high- and low-side drive strength (|IOH| = |IOL| ≥ 8mA at VCC = 4.5V) and balanced propagation delays (tPLH ≅ tPHL), minimizing signal skew in bidirectional data buses and address latching circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tPD (Typ.) | 3.4 ns at VCC = 5V - enables sub-300 MHz data throughput in short trace interfaces |
| VCC Range | 2V to 5.5V - supports direct integration into both 3.3V and 5V logic domains |
| Input Voltage Range | –0.5V to +7.0V - permits hot-plug-safe interfacing regardless of supply state |
| IOL / IOH | ≥ 8 mA at VCC = 4.5V - drives standard TTL loads and multiple CMOS inputs |
| ICC (Max) | 1 µA at TA = 25°C - enables ultra-low static power in battery-backed or always-on subsystems |
| VIH / VIL | 0.7VCC / 0.3VCC - provides 28% noise margin across full VCC range for reliable logic sampling |
| tPZH / tPLZ | 3.6 ns / 3.0 ns (5V, CL = 15pF) - ensures fast bus arbitration and dynamic enable/disable control |
Pinout & Package
SOT23-5L surface-mount package: 2.80 × 1.50 × 1.30 mm body, 0.95 mm pitch, 5-terminal configuration with exposed pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - 1G | Active-low Output Enable | Drives output Y to high-impedance when HIGH; enables buffer when LOW |
| 2 - 1A | Data Input | Accepts logic levels from –0.5V to +7V, independent of VCC |
| 3 - GND | Ground Reference | 0V return path for all internal circuitry and output current sinking |
| 4 - 1Y | 3-State Output | Non-inverted buffered output with symmetrical sourcing/sinking capability |
| 5 - VCC | Positive Supply | Primary power rail (2V–5.5V); powers internal logic and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Input Overvoltage Tolerance | Supports 0–7V input signals with no damage or leakage, even when VCC = 0V |
| Power-Down Input Protection | Inputs remain high-impedance and non-latching during VCC ramp-up/down sequences |
| Symmetrical Output Drive | Matched 8mA sourcing/sinking ensures consistent rise/fall times and reduced EMI |
| Wide Temperature Range | Specified from –55°C to +125°C for automotive under-hood and industrial control use |
| Low Dynamic Power | CPD = 10 pF enables <1 µA ICC at 100 kHz switching - ideal for low-duty-cycle sensing nodes |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Adding isolated digital input channels to a 3.3V microcontroller-based PLC rack while accepting 5V field sensor signals. IC Role / Device Role / Timing Role: Level-shifting buffer isolating legacy 5V sensors from low-voltage MCU GPIO, with 3-state control synchronized to scan cycle. Use Value: Eliminates need for discrete level-shifters or resistive dividers; 7V-tolerant inputs prevent latch-up during sensor cable ESD events. | Use Scenario: Interfacing door-lock actuator status feedback (5V open-collector) to a 3.3V CAN node MCU in harsh temperature environments. IC Role / Device Role / Timing Role: Unidirectional status buffer with fail-safe high-Z state during MCU reset or brownout. Use Value: Guaranteed operation at –40°C to +125°C; input overvoltage tolerance avoids external TVS diodes on each feedback line. |
| Portable Medical Sensor Hub | IoT Edge Node Power Sequencing |
Use Scenario: Aggregating analog front-end status flags (3.3V) and battery gauge alerts (5V) into a shared diagnostic bus for an ultra-low-power wearable controller. IC Role / Device Role / Timing Role: Glue logic buffer enabling mixed-voltage status reporting without cross-domain coupling. Use Value: 1µA max ICC extends battery life; 28% noise margin prevents false triggers in noisy clinical EM environments. | Use Scenario: Controlling power-enable sequencing of multiple LDOs in a multi-rail IoT SoC module where enable signals must be asserted only after main VCC stabilizes. IC Role / Device Role / Timing Role: Controlled 3-state gate delaying downstream enable assertion until VCC reaches regulation threshold. Use Value: Input tolerance allows 1G to be driven directly from a slow-rising supervisor output without level shifting or pull-up dependencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-channel 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DBVR | Lower VCC min (1.65V), higher max ICC (10µA), same SOT23-5L footprint | Better suited for 1.8V system integration; less suitable for wide-temp automotive use | Select when operating below 2V or requiring TI's enhanced ESD rating (±4kV HBM) |
| 74AHC1G126SE-7 | Higher speed (tPD = 2.5ns @ 5V), tighter VOH/VOL specs, same pinout | Optimized for high-speed clock distribution; lacks 7V input tolerance | Select for timing-critical paths where propagation delay dominates over input ruggedness |
Compared with SN74LVC1G126DBVR and 74AHC1G126SE-7, the 74V1G126STR uniquely combines 7V input tolerance, –55°C to +125°C qualification, and sub-1µA quiescent current - making it optimal for safety-critical, mixed-voltage, and ultra-low-power industrial edge nodes.
Availability
74V1G126STR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, portable medical sensor hubs, and IoT edge node power sequencing requiring stable component supply across extended temperature and mixed-voltage conditions.
Supply support for 74V1G126STR 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, Switzerland, delivering silicon solutions for smart driving, power management, and embedded processing.
The 74V series targets high-speed, low-power, and ruggedized logic interface applications - specifically engineered for industrial automation, automotive subsystems, and mission-critical embedded control where reliability across voltage and temperature extremes is mandatory.
FAQ
Can 74V1G126STR operate with VCC = 0V while receiving 5V input signals?
Yes. The device features power-down protection: inputs tolerate –0.5V to +7.0V regardless of VCC state. When VCC = 0V, all inputs remain high-impedance with ≤1µA leakage, and the output stays in high-impedance mode - preventing back-powering or latch-up in unpowered subsystems.
What is the maximum capacitive load this buffer can drive reliably?
It is characterized up to 50pF load capacitance with guaranteed AC performance (tPLH/tPHL ≤ 7.5ns at 5V). For loads >50pF, propagation delay increases linearly; design margin requires limiting trace + stub capacitance to ≤40pF for timing-critical 100MHz+ data strobes.
Does the 74V1G126STR require external pull-up or pull-down resistors on 1G or 1A?
No. Inputs have no internal bias; however, floating 1G will force output 1Y into high-impedance. For deterministic startup behavior, tie 1G to GND via a 10kΩ resistor if controlled by an open-drain driver, or use an active enable signal - no pull-up/pull-down needed for CMOS-driven inputs.
How does the 74V1G126STR compare to standard 74HC1G126 in harsh environments?
Unlike 74HC1G126, the 74V1G126STR specifies operation down to –55°C and up to +125°C, offers 7V input tolerance (vs. VCC+0.5V), and guarantees 1µA max ICC at 25°C. These features make it suitable for under-hood automotive, outdoor industrial, and medical equipment where thermal and electrical stress exceed HC-series limits.
74V1G126STR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74V
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 1
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
74V1G126STR FAQ
1.How can I place an order for 74V1G126STR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74V1G126STR 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 74V1G126STR reliable?
The price and inventory of 74V1G126STR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74V1G126STR is usually 5 days.
3.What payment methods are accepted for 74V1G126STR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74V1G126STR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74V1G126STR?
74V1G126STR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74V1G126STR 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 74V1G126STR?
For technical support, including 74V1G126STR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74V1G126STR requirements.
6.How does Aetrix verify that 74V1G126STR is sourced from the original manufacturer or authorized distributors?
All 74V1G126STR 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 74V1G126STR meets industry standards.
7.What is the process for return or replacement of 74V1G126STR?
All 74V1G126STR units undergo pre-shipment inspection (PSI). If there is an issue with 74V1G126STR, 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 74V1G126STR part is unused and in its original packaging.
Return procedure for 74V1G126STR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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