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Renesas 74HCT125P-E
- Part No.:
- 74HCT125P-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74HCT125P-E.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
74HCT125P-E from Renesas Electronics is a quad bus buffer gate with 3-state outputs, designed for bidirectional data bus isolation and signal routing in TTL- and CMOS-compatible digital systems. It features independent enable-controlled buffers (1C–4C), operates at VCC = 4.5–5.5 V, delivers tPLH/tPHL = 12 ns typ (CL = 50 pF), and supports fanout of 15 LSTTL loads - used in microcontroller peripheral interfacing and memory address/data bus control.
For engineers reviewing the 74HCT125P-E datasheet, 74HCT125P-E pinout, 74HCT125P-E application, or 74HCT125P-E equivalent, key selection criteria include its active-low 3-state enable logic per channel, LSTTL/CMOS dual-voltage compatibility, guaranteed operation from –40°C to +85°C, and DIP-14 package suitability for through-hole prototyping and industrial control backplanes.
Technical Context
The 74HCT125P-E implements four independent non-inverting buffer gates, each with a dedicated active-low 3-state output enable (C input). Its HCT logic family ensures TTL-level input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) while driving CMOS-compatible output levels (VOH ≥ 4.13 V, VOL ≤ 0.33 V at VCC = 4.5 V).
Each channel operates with propagation delay ≤25 ns over full temperature range, output enable/disable times ≤38 ns, and off-state leakage ≤±5.0 µA. Input current is limited to ±1.0 µA max, and quiescent supply current remains ≤40 µA across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5 V rail tolerances including aging and load-induced droop. |
| Propagation Delay | 12 ns typ (A→Y, CL = 50 pF) - Enables reliable timing in 25 MHz+ synchronous bus systems. |
| Output Drive | ±6 mA - Sufficient to drive 15 LSTTL loads or terminate short PCB traces without external buffering. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - Guarantees robust noise margin when interfacing legacy TTL logic or microcontroller GPIOs. |
| 3-State Leakage | ±5.0 µA max - Prevents unintended bus contention during high-impedance state in multi-driver configurations. |
| Operating Temp | –40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and automation equipment. |
Pinout & Package
DIP-14 package (PRDP0014AB-B / DP-14AV), 19.2 mm × 6.3 mm body, 2.54 mm pitch, Ni/Pd/Au-plated leads, 0.97 g typical mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel Enable (1C–4C) | Active-low control: logic low enables buffer output; high forces high-impedance state. |
| 2, 5, 11, 14 | Buffer Input (1A–4A) | Non-inverting data input per channel; accepts TTL- or CMOS-level signals. |
| 3, 6, 12, 9 | Buffer Output (1Y–4Y) | 3-state output per channel; drives bus or downstream logic only when corresponding C is low. |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry. |
| 14 | VCC | Positive supply rail; must be decoupled locally to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL/CMOS dual compatibility | Accepts TTL input thresholds while delivering CMOS-level output swing - eliminates level-shifter need in mixed-logic systems. |
| Independent per-channel 3-state control | Enables selective bus arbitration without gating logic - simplifies address/data multiplexing in microcontroller peripherals. |
| Low static current | ICC ≤ 40 µA max at Ta = –40°C to +85°C - reduces standby power in battery-backed or energy-sensitive applications. |
| High noise immunity | Input hysteresis not specified, but VIH/VIL margins exceed 0.4 V - resists EMI-induced glitches on long PCB traces. |
Applications
| Microcontroller Bus Isolation | Memory Address/Data Buffering |
|---|---|
Use Scenario: Isolating multiple peripheral devices (ADC, DAC, UART) sharing a common data bus connected to an MCU GPIO port. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer enabling time-multiplexed access without bus contention. Use Value: Eliminates need for discrete MOSFET switches or complex bus arbitration logic; supports deterministic read/write timing via enable sequencing. | Use Scenario: Driving address lines from a microcontroller to multiple SRAM or EPROM chips on a shared memory bus. IC Role / Device Role / Timing Role: Non-inverting buffer with per-line enable control to isolate unselected memory devices. Use Value: Prevents capacitive loading and signal degradation across long address traces; enables clean edge transitions up to 25 MHz. |
| Industrial I/O Expansion | Legacy System Interface Adapter |
Use Scenario: Extending PLC or industrial controller I/O capability by buffering digital sensor/actuator signals before FPGA or ASIC processing. IC Role / Device Role / Timing Role: Signal conditioning and isolation layer between field-side sensors and logic-side controllers. Use Value: Provides galvanic separation via logic-level translation and current drive margin - improves noise rejection in electrically noisy factory environments. | Use Scenario: Interfacing modern microcontrollers with vintage TTL-based test equipment or instrumentation subsystems. IC Role / Device Role / Timing Role: Level- and timing-compatible bridge ensuring signal integrity across technology generations. Use Value: Maintains setup/hold timing margins while converting between CMOS output swing and TTL input thresholds - avoids redesign of legacy backplane wiring. |
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 |
|---|---|---|---|
| SN74HCT125N | Same logic function, identical pinout, TI-manufactured; tPD = 13 ns typ (CL = 50 pF), ICC ≤ 40 µA max. | Qualified to TI's industrial temp range (–40°C to +85°C); RoHS-compliant lead finish differs (Pb-free NiPdAu vs Renesas' Ni/Pd/Au). | Select SN74HCT125N if sourcing from TI-authorized channels or requiring TI-specific qualification documentation. |
| 74VHC125N | Pin-compatible but uses VHCT logic: VIH = 2.0 V min, VIL = 0.8 V max, but VCC = 2.0–5.5 V; tPD = 7.5 ns typ (CL = 50 pF). | Wider supply range enables single-rail operation with 3.3 V or 5 V systems; higher speed suits faster bus timing but increases dynamic current. | Choose 74VHC125N when operating below 4.5 V or requiring sub-10 ns propagation - verify input threshold compatibility with driving source. |
Compared with 74HCT125P-E, SN74HCT125N offers identical functionality and timing with alternate supply-chain traceability, while 74VHC125N extends voltage flexibility and speed at the cost of higher sensitivity to supply noise and reduced noise margin at 5 V.
Availability
74HCT125P-E is available at Aetrix Electronics and suitable for industrial control panels, test and measurement equipment, and office automation systems requiring stable component supply and long-term obsolescence management.
Supply support for 74HCT125P-E 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
Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The HD74HCT series was developed for TTL-compatible, high-noise-immunity digital interface applications in industrial and commercial equipment - emphasizing reliability, wide temperature operation, and direct drop-in replacement for legacy 74LS logic.
FAQ
What is the logic configuration of the 74HCT125P-E?
The 74HCT125P-E contains four independent non-inverting buffer gates, each with a dedicated active-low 3-state output enable (C input). When C is low, the output Y follows input A; when C is high, Y enters high-impedance state. This configuration enables precise bus control without signal inversion or additional logic.
Does the 74HCT125P-E support 3.3 V logic inputs?
No - the 74HCT125P-E is an HCT-family device with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), optimized for 5 V operation. While a 3.3 V high signal may register as valid under some conditions, it falls below the guaranteed VIH minimum and risks unreliable switching; use 74VHCT125 or level translators for 3.3 V–5 V interfacing.
What is the maximum capacitive load the 74HCT125P-E can drive reliably?
The 74HCT125P-E is characterized for CL = 50 pF in timing specifications, with tPLH/tPHL = 12 ns typ. It can drive heavier loads (e.g., >100 pF) at reduced speed, but output rise/fall times degrade linearly; for stable 25 MHz bus operation, keep total trace + load capacitance ≤50 pF and use local VCC decoupling.
Is the 74HCT125P-E RoHS compliant?
Yes - the 74HCT125P-E uses Ni/Pd/Au plating on leads and conforms to EU RoHS Directive requirements. Renesas confirms compliance in product change notices and material declarations; no lead or hazardous substances exceed RoHS threshold limits.
Can the 74HCT125P-E replace a 74LS125 in existing designs?
Yes - the 74HCT125P-E is a direct functional and pinout replacement for 74LS125, offering identical logic behavior, same DIP-14 package, and improved parameters: lower ICC (40 µA vs ~15 mA), higher noise immunity, and guaranteed operation down to –40°C. No PCB changes are required, but verify VCC stability since HCT draws less current.
74HCT125P-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74HCT
- Package/Case:
- -
- Packaging:
- Bulk
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HCT125P-E FAQ
1.How can I place an order for 74HCT125P-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125P-E 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 74HCT125P-E reliable?
The price and inventory of 74HCT125P-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125P-E is usually 5 days.
3.What payment methods are accepted for 74HCT125P-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125P-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125P-E?
74HCT125P-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125P-E 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 74HCT125P-E?
For technical support, including 74HCT125P-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125P-E requirements.
6.How does Aetrix verify that 74HCT125P-E is sourced from the original manufacturer or authorized distributors?
All 74HCT125P-E 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 74HCT125P-E meets industry standards.
7.What is the process for return or replacement of 74HCT125P-E?
All 74HCT125P-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125P-E, 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 74HCT125P-E part is unused and in its original packaging.
Return procedure for 74HCT125P-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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