My Inquiry
My Account
STMicroelectronics 74VHCT125AMTR
- Part No.:
- 74VHCT125AMTR
- Manufacturer:
- STMicroelectronics
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74VHCT125AMTR.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,168
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74VHCT125AMTR from STMicroelectronics is a quad 3-state bus buffer IC with TTL-compatible inputs, designed for bidirectional data bus isolation and level translation in 5V digital systems. It features 3.8 ns typical propagation delay, ±8 mA output drive, 2 µA max quiescent current at 25°C, and operates across 4.5–5.5 V supply. Used in microcontroller peripheral interfacing and memory address buffering.
For engineers reviewing the 74VHCT125AMTR datasheet, 74VHCT125AMTR pinout, 74VHCT125AMTR application, or 74VHCT125AMTR equivalent, key selection criteria include 3-state enable timing (tPLZ/tPZL ≤ 8.8 ns), input voltage tolerance up to 7 V independent of VCC, symmetrical output impedance, and latch-up immunity for robust board-level operation.
Technical Context
The device implements four independent non-inverting buffers, each controlled by a dedicated active-high 3-state enable input (1G–4G). All inputs accept 0–7 V regardless of VCC, enabling hot-swap and mixed-voltage interface capability. Outputs exhibit matched high/low drive strength (|IOH| = IOL ≥ 8 mA) and balanced propagation delays (tPLH ≅ tPHL).
It uses sub-micron C2MOS technology with double-layer metal wiring, delivering low dynamic noise (VOLP ≤ 0.8 V) and 2 kV HBM ESD protection on all pins. Power-down protection ensures safe operation during supply sequencing or partial power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tPD (typ) | 3.8 ns at VCC = 5 V - enables >100 MHz bus operation with tight timing margins |
| ICC (max) | 2 µA at TA = 25°C - supports ultra-low static power in always-on control logic |
| VIL / VIH | 0.8 V / 2.0 V - ensures reliable recognition of TTL-output logic levels |
| IOL / IOH (min) | 8 mA - drives standard 50 Ω transmission lines or multiple CMOS loads |
| VCC range | 4.5–5.5 V - accommodates industrial-grade 5 V rail tolerances |
| Input voltage range | −0.5 to +7.0 V - allows safe connection to unpowered or overvoltage sources |
| ESD rating | 2 kV HBM - protects against handling-induced discharge without external clamps |
Pinout & Package
TSSOP-14 package: 4.9 × 6.6 mm body, 0.65 mm pitch, thin-profile surface-mount construction optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1G–4G (OE) | Active-high 3-state enable inputs - assert high to disable output (Z-state) |
| 2, 5, 9, 12 | 1A–4A (IN) | Buffer data inputs - tolerate 0–7 V independent of VCC for mixed-rail interfacing |
| 3, 6, 8, 11 | 1Y–4Y (OUT) | Non-inverting buffered outputs - deliver matched sourcing/sinking current |
| 7 | GND | Ground reference - decoupling required within 5 mm of VCC pin for noise control |
| 14 | VCC | Positive supply - must be stabilized with ≥100 nF ceramic capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Hot-swap tolerant inputs | Accepts −0.5 V to +7.0 V regardless of VCC state - eliminates sequencing constraints |
| Matched output drive | |IOH| = IOL ≥ 8 mA - ensures consistent rise/fall times and signal integrity |
| Low dynamic noise | VOLP ≤ 0.8 V (CL = 50 pF) - reduces crosstalk in dense routing environments |
| Latch-up immunity | Improved vs. standard VHCT - prevents destructive parasitic SCR activation under transient stress |
| 3-state timing control | tPLZ ≤ 8.8 ns, tPZL ≤ 6.0 ns - supports fast bus turnaround in shared-data applications |
Applications
| Microcontroller Bus Isolation | Memory Address Buffering |
|---|---|
Use Scenario: Isolating GPIO expansion ports between MCU and peripheral ICs sharing a common data bus. IC Role / Device Role / Timing Role: Quad buffer provides per-channel 3-state control to prevent bus contention during read/write cycles. Use Value: Enables deterministic bus arbitration with <8.8 ns enable delay and 3.8 ns propagation latency. | Use Scenario: Driving address lines to multiple SRAM or Flash devices from a single controller. IC Role / Device Role / Timing Role: Non-inverting buffer strengthens fan-out capacity while maintaining signal edge fidelity. Use Value: Supports 8+ load capacitance with matched tPLH/tPHL and <0.55 V VOL at 8 mA sink. |
| Level Translation Interface | Industrial Control Backplane |
Use Scenario: Interfacing legacy 5 V TTL logic to newer 3.3 V subsystems via resistor-free translation. IC Role / Device Role / Timing Role: TTL-threshold inputs accept 5 V signals; outputs swing rail-to-rail at 5 V for downstream compatibility. Use Value: Eliminates external level shifters while maintaining 3.8 ns timing and 2 kV ESD robustness. | Use Scenario: Distributing control signals across modular I/O racks in PLC or motion-control cabinets. IC Role / Device Role / Timing Role: Bus buffer isolates master controller from backplane noise and capacitive loading. Use Value: Withstands −55°C to +125°C ambient and tolerates 7 V input transients during field wiring faults. |
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 |
|---|---|---|---|
| 74VHC125MTR | CMOS-input thresholds (VIH = 3.5 V min), no TTL compatibility; lower ICC (1 µA) | Requires 3.3 V or higher logic sources; unsuitable for direct TTL interface | Select when driving only CMOS loads and minimizing standby current is critical |
| SN74LVC125APWR | 3.3 V only (1.65–3.6 V), higher speed (tPD = 2.5 ns), 24 mA drive | Not usable at 5 V; requires level-shifting for legacy 5 V systems | Prefer for new 3.3 V designs needing faster switching and stronger drive |
Compared with 74VHC125MTR and SN74LVC125APWR, the 74VHCT125AMTR uniquely bridges 5 V TTL and CMOS domains with 0–7 V input tolerance and guaranteed 5 V operation - essential where backward compatibility and supply flexibility outweigh raw speed or ultra-low ICC.
Availability
74VHCT125AMTR is available at Aetrix Electronics and suitable for microcontroller bus isolation, memory address buffering, level translation interface, and industrial control backplane applications requiring stable component supply across extended temperature and voltage ranges.
Supply support for 74VHCT125AMTR 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.
The VHCT logic family targets 5 V systems requiring TTL compatibility, low power, and enhanced robustness - specifically engineered for industrial control, instrumentation, and legacy system upgrades where reliability under voltage stress is critical.
FAQ
Can 74VHCT125AMTR operate safely with VCC = 0 V while inputs are at 5 V?
Yes. Its inputs tolerate −0.5 V to +7.0 V independent of VCC, and power-down protection prevents reverse current flow or latch-up. This allows hot-plug operation and safe interfacing to powered subsystems before main supply ramps.
What is the maximum capacitive load this device can drive while maintaining specified timing?
At CL = 50 pF and VCC = 5.0 V, propagation delay remains within spec (tPLH/tPHL ≤ 7.5 ns). Driving >50 pF increases delay nonlinearly and may exceed setup/hold windows - use series termination or reduce fan-out for loads above 40 pF.
Does the 74VHCT125AMTR require external pull-up or pull-down resistors on unused inputs?
No. Input leakage is ≤±1.0 µA, and internal structure prevents floating node instability. However, tying unused OE pins low (to GND) ensures outputs remain disabled and minimizes standby current in unused channels.
How does its ESD protection compare to standard 74HC125 devices?
74VHCT125AMTR guarantees 2 kV HBM ESD immunity per IEC 61000-4-2, achieved via enhanced input clamp structures and process hardening. Standard 74HC125 typically offers only 200 V HBM unless explicitly rated - making VHCT preferred for field-deployed equipment.
74VHCT125AMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHCT
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74VHCT125AMTR FAQ
1.How can I place an order for 74VHCT125AMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT125AMTR 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 74VHCT125AMTR reliable?
The price and inventory of 74VHCT125AMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT125AMTR is usually 5 days.
3.What payment methods are accepted for 74VHCT125AMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT125AMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT125AMTR?
74VHCT125AMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT125AMTR 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 74VHCT125AMTR?
For technical support, including 74VHCT125AMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT125AMTR requirements.
6.How does Aetrix verify that 74VHCT125AMTR is sourced from the original manufacturer or authorized distributors?
All 74VHCT125AMTR 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 74VHCT125AMTR meets industry standards.
7.What is the process for return or replacement of 74VHCT125AMTR?
All 74VHCT125AMTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT125AMTR, 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 74VHCT125AMTR part is unused and in its original packaging.
Return procedure for 74VHCT125AMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHCT125AMTR Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
