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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics 74VHC125TTR

Name: 74VHC125TTR
Brand: STMicroelectronics
SKU: 74VHC125TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74VHC125TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: 74VHC125TTR.pdf

Description:: IC BUF NON-INVERT 5.5V 14TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74VHC125TTR from STMicroelectronics is a quad 3-state bus buffer with independent enable inputs, designed for voltage-level translation (5V ↔ 3V), bus isolation, and signal routing in high-speed digital systems. It operates from 2V to 5.5V, delivers 3.8ns typical propagation delay at 5V, supports ±8mA symmetrical output drive, and features input overvoltage tolerance up to 7V independent of VCC.

For engineers reviewing the 74VHC125TTR datasheet, 74VHC125TTR pinout, 74VHC125TTR application, or 74VHC125TTR equivalent, key selection criteria include 3-state timing symmetry (tPLH ≅ tPHL), power-down input protection, low quiescent current (4µA max), and IEC-compliant logic symbol compatibility with legacy 74-series buffers.

Technical Context

The 74VHC125TTR implements four independent non-inverting buffers, each with a dedicated active-low 3-state enable (G) input controlling output impedance. Its C2MOS process enables rail-to-rail input tolerance (0–7V), ESD immunity (2kV HBM), and latch-up resistance per JEDEC JESD78.

All inputs accept voltages beyond VCC (up to +7V) without damage or back-powering, enabling safe interfacing between mixed-voltage domains. Output disable/enable times are tightly matched (tPLZ/tPHZ ≤ 6.0ns, tPZL/tPZH ≤ 10.0ns at 5V/50pF), ensuring clean bus contention avoidance in multi-driver systems.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	2V to 5.5V - supports dual-supply systems and brown-out tolerant operation
tPD (Typ)	3.8ns at VCC = 5V, CL = 15pF - enables >100MHz bus clocking with margin
IOL / IOH	±8mA min - drives standard TTL loads and 50Ω transmission lines
VIH / VIL	0.7VCC / 0.3VCC - ensures noise margins ≥28% of VCC across full supply range
ICC (Max)	4µA at TA = 25°C - enables ultra-low static power in battery-backed or standby circuits
VOLP (Max)	0.8V at VCC = 5V, CL = 50pF - limits ground bounce during simultaneous switching
Input Voltage Range	−0.5V to +7.0V - allows hot-swap, level-shifting, and fault-tolerant input handling

Pinout & Package

TSSOP-14 package (JEDEC MO-153, 4.4mm × 5.0mm body, 0.65mm pitch), lead-free and RoHS compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 4, 10, 13	G1–G4 (Output Enable)	Active-high control: logic HIGH forces corresponding Y output into high-impedance state
2, 5, 9, 12	A1–A4 (Data Inputs)	CMOS-compatible inputs with overvoltage tolerance (0–7V); no pull-up/down required
3, 6, 8, 11	Y1–Y4 (Data Outputs)	Non-inverting buffered outputs with symmetrical sourcing/sinking capability (±8mA)
7	GND	Digital ground reference; decoupling capacitor must be placed adjacent to this pin
14	VCC	Positive supply (2–5.5V); requires local 100nF ceramic bypass capacitor

Key Features

Feature	Design Value
Power-down input protection	Inputs tolerate −0.5V to +7.0V regardless of VCC state - prevents backfeeding and enables live insertion
Symmetrical output drive	\|IOH\| = IOL = 8mA min - eliminates skew in bidirectional bus drivers and reduces termination complexity
Balanced propagation delays	tPLH ≅ tPHL - ensures minimal duty-cycle distortion in clock distribution or data strobe paths
High noise immunity	VNIH = VNIL = 28% VCC min - maintains reliable logic thresholds under EMI or crosstalk conditions
Low dynamic noise	VOLP = 0.8V max at 5V/50pF - suppresses simultaneous switching output (SSO) noise in dense PCB layouts

Applications

PCI Express Slot Interface

Industrial PLC Backplane Bus

Use Scenario: Isolating configuration address/data lines between 3.3V PCIe root complex and 5V add-in card logic.

IC Role / Device Role / Timing Role: Quad non-inverting buffer with independent 3-state enables, translating and isolating control signals while preserving timing integrity.

Use Value: Input overvoltage tolerance (0–7V) permits safe hot-plug detection; 3.8ns tPD ensures setup/hold compliance at 100MHz PCI clock rates.

Use Scenario: Driving shared I/O backplane lines among multiple modular controllers operating at different supply rails.

IC Role / Device Role / Timing Role: Bus buffer providing controlled signal fanout and contention-free bus arbitration via per-channel enable control.

Use Value: Independent G inputs allow precise sequencing of module access; ±8mA drive sustains signal integrity across 30cm backplane traces.

Automotive Body Control Module

Medical Diagnostic Data Acquisition

Use Scenario: Level-shifting sensor interface signals (e.g., LIN transceiver outputs) from 5V microcontroller to 3.3V ADC domain.

IC Role / Device Role / Timing Role: Voltage-translating buffer with rail-independent inputs, enabling robust communication across mixed-supply subsystems.

Use Value: 2V–5.5V VCC range and 2kV ESD immunity meet AEC-Q100 stress requirements; low ICC supports sleep-mode power budgets.

Use Scenario: Buffering high-resolution analog front-end digital control lines (SPI clock, chip select) in low-noise diagnostic equipment.

IC Role / Device Role / Timing Role: Low-noise, low-skew buffer isolating sensitive analog sections from digital switching noise.

Use Value: VOLP ≤ 0.8V and balanced tPLH/tPHL minimize ground bounce and jitter on timing-critical SPI interfaces.

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
SN74LVC125APW	Lower VCC range (1.65–3.6V); 3.5ns tPD at 3.3V; no 7V input tolerance	Restricted to single-supply 3.3V systems; unsuitable for 5V↔3V translation	Select when only 3.3V operation is required and board space favors TSSOP-14 footprint compatibility
74HC125PW	Slower tPD (19ns typ at 4.5V); higher ICC (80µA max); no input overvoltage rating	Lacks hot-swap safety and high-speed timing for modern bus interfaces	Choose only for cost-sensitive, low-frequency (<10MHz) legacy designs where 7V input tolerance is unnecessary

Compared with SN74LVC125APW and 74HC125PW, the 74VHC125TTR uniquely combines 5V↔3V translation capability, 7V input tolerance, and sub-4ns speed-making it the only option for mixed-rail, hot-pluggable, or high-frequency bus isolation where reliability and timing margin are critical.

Availability

74VHC125TTR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, medical diagnostic data acquisition systems, and PCIe slot interfaces requiring stable component supply across extended temperature ranges (−55°C to +125°C).

Supply support for 74VHC125TTR 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.

The 74VHC125TTR belongs to ST's high-speed CMOS logic family, engineered for interoperability across voltage domains and robustness in harsh environments-targeting industrial automation, transportation, and precision instrumentation.

FAQ

Can 74VHC125TTR safely interface a 5V microcontroller with a 3.3V FPGA?

Yes. Its inputs tolerate 0–7V regardless of VCC, and its VCC can be set to 3.3V while accepting 5V logic inputs. Outputs swing rail-to-rail (0V to 3.3V), meeting FPGA input thresholds. No external level-shifting components are needed, provided VCC is stabilized at the target I/O voltage.

What is the maximum capacitive load the 74VHC125TTR can drive while maintaining 3.8ns propagation delay?

The 3.8ns typical tPD is specified at CL = 15pF and VCC = 5.0V. At CL = 50pF, tPD increases to 5.3ns. For designs requiring ≤4ns delay, total load-including trace capacitance, probe effects, and input capacitance of downstream devices-must stay below ~20pF.

Does the 74VHC125TTR require external pull-up or pull-down resistors on its enable inputs?

No. The G inputs have CMOS-compatible thresholds (VIH = 0.7VCC, VIL = 0.3VCC) and negligible leakage (±1µA max). They may be driven directly from other logic outputs or microcontroller GPIOs. Pull resistors are only needed if floating states must be avoided during power-up or reset.

How does the 74VHC125TTR handle simultaneous switching of all four outputs?

Its VOLP (dynamic low-voltage quiet output) is specified at 0.8V max under worst-case switching (all outputs toggling into 50pF load at 5V). This limits ground bounce and ensures noise remains within 16% of VCC-critical for maintaining signal integrity in high-density digital systems.

74VHC125TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74VHC

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

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:: 8mA, 8mA

Voltage - Supply:: 2V ~ 5.5V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

74VHC125TTR FAQ

1.How can I place an order for 74VHC125TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74VHC125TTR 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 74VHC125TTR reliable?

The price and inventory of 74VHC125TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHC125TTR is usually 5 days.

3.What payment methods are accepted for 74VHC125TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHC125TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74VHC125TTR?

74VHC125TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74VHC125TTR 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 74VHC125TTR?

For technical support, including 74VHC125TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHC125TTR requirements.

6.How does Aetrix verify that 74VHC125TTR is sourced from the original manufacturer or authorized distributors?

All 74VHC125TTR 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 74VHC125TTR meets industry standards.

7.What is the process for return or replacement of 74VHC125TTR?

All 74VHC125TTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHC125TTR, 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 74VHC125TTR part is unused and in its original packaging.

Return procedure for 74VHC125TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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