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Texas Instruments CD74HC125EG4
- Part No.:
- CD74HC125EG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HC125EG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,226
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Product details
Overview
CD74HC125EG4 from Texas Instruments is a quadruple 3-state buffer IC performing Y = A logic in positive polarity, operating across 2 V–6 V supply and –55°C to +125°C ambient range, with 4.5 V VOH ≥ 3.98 V at –4 mA and 4.5 V VOL ≤ 0.33 V at 4 mA - used for bidirectional bus enable control in industrial data acquisition systems.
For engineers reviewing the CD74HC125EG4 datasheet, CD74HC125EG4 pinout, CD74HC125EG4 application, or CD74HC125EG4 equivalent, key selection criteria include guaranteed 3-state leakage (IOZ ≤ ±10 µA), propagation delay (tpd ≤ 30 ns at 4.5 V/50 pF), thermal resistance (RθJA = 62.7°C/W), and PDIP-14 package compatibility with legacy through-hole PCB layouts.
Technical Context
This device implements four independent CMOS buffer channels, each with active-low 3-state output enable (OE) and standard CMOS inputs. Each channel replicates input A to output Y when OE is low; outputs enter high-impedance state when OE is high.
It uses balanced CMOS 3-state outputs capable of sourcing/sinking up to ±35 mA per output, with input transition time tolerance down to 400 ns (at 6 V) and output load capacitance support up to 50 pF while maintaining specified timing and voltage levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
| VOH / VOL | ≥ 3.98 V / ≤ 0.33 V at 4.5 V, –4 mA / 4 mA - ensures robust noise margin against LSTTL loads. |
| tpd (A→Y) | ≤ 30 ns at 4.5 V, CL = 50 pF - enables reliable timing in 33 MHz synchronous bus applications. |
| IOZ (3-State Leakage) | ±10 µA max at 6 V - minimizes signal contention risk when multiple buffers share a common bus line. |
| Input Capacitance | 10 pF - reduces loading on upstream drivers and preserves signal integrity in fanout-critical designs. |
Pinout & Package
CD74HC125EG4 is packaged in a 14-pin plastic dual in-line package (PDIP-N), with 19.30 mm × 6.40 mm body size, through-hole mounting, and RoHS-compliant NiPdAu lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Controls 3-state mode per channel; low = enabled (Y = A), high = high-Z output. |
| 1A–4A | Buffer input | CMOS-compatible input with VIH/VIL thresholds scaling with VCC; requires fast edge rates (≤400 ns). |
| 1Y–4Y | Buffer output | 3-state CMOS output capable of ±35 mA drive; must not be shorted to VCC/GND. |
| GND (Pin 7) | Ground reference | Common return path for all channels; decoupling capacitor must connect here and to VCC. |
| VCC (Pin 14) | Power supply | Single positive rail (2–6 V); bypassing with 0.1 µF ceramic capacitor is mandatory for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent buffers | Four isolated channels allow selective bus segment enabling without cross-talk or timing skew. |
| 3-State output architecture | Enables shared-bus topology by electrically isolating outputs when disabled - critical for multi-master systems. |
| Wide supply voltage range | 2 V–6 V operation permits direct interface with 3.3 V microcontrollers and 5 V legacy peripherals. |
| High-temperature rating | –55°C to +125°C operation supports deployment in motor drives, power inverters, and outdoor instrumentation. |
| Low power consumption | ICC ≤ 160 µA at 6 V ensures minimal quiescent current in always-on monitoring circuits. |
Applications
| Industrial Bus Isolation | Legacy System Interfacing |
|---|---|
Use Scenario: Isolating sensor data lines in programmable logic controller (PLC) backplanes during firmware updates. IC Role / Device Role / Timing Role: CD74HC125EG4 acts as a controlled bus gate, enabling/disabling analog-to-digital converter (ADC) output paths via discrete OE signals synchronized to system reset. Use Value: Prevents bus contention during reconfiguration, eliminating spurious readings and ensuring deterministic startup sequence. | Use Scenario: Level-shifting between 3.3 V FPGA I/O banks and 5 V industrial display controllers. IC Role / Device Role / Timing Role: CD74HC125EG4 serves as unidirectional voltage-tolerant buffer, accepting 3.3 V logic inputs and driving 5 V CMOS loads with full VOH/VOL compliance. Use Value: Eliminates need for external level translators while maintaining timing integrity and reducing BOM count. |
| Test Equipment Signal Routing | Automotive Diagnostic Interface |
Use Scenario: Multiplexing calibration signals across multiple sensor test fixtures in automated test equipment (ATE). IC Role / Device Role / Timing Role: CD74HC125EG4 functions as a digitally controlled signal switch, routing reference voltages or clock signals under microcontroller command. Use Value: Enables single-instrument reuse across diverse DUTs, reducing test floor footprint and calibration overhead. | Use Scenario: Enabling/disabling CAN transceiver TX/RX lines during ECU sleep/wake transitions. IC Role / Device Role / Timing Role: CD74HC125EG4 gates diagnostic bus signals to prevent leakage current into powered-down CAN PHY sections. Use Value: Reduces standby current by >100 µA per channel, extending vehicle battery life during prolonged parking modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC125N | Same logic function, identical pinout, but rated only for –40°C to +85°C industrial temperature range. | Not suitable for extended-temperature deployments such as engine control modules or outdoor base stations. | Select SN74HC125N only for cost-sensitive commercial-grade applications where ambient does not exceed 85°C. |
| CD74HCT125E | TTL-compatible input thresholds (VIH = 2 V min), whereas CD74HC125EG4 uses CMOS thresholds (VIH = 70% VCC). | Better interoperability with legacy 5 V TTL outputs, but reduced noise immunity in mixed-signal environments. | Choose CD74HCT125E when interfacing directly with older 74LS-series logic; otherwise prefer CD74HC125EG4 for modern low-power designs. |
Compared with SN74HC125N and CD74HCT125E, CD74HC125EG4 uniquely combines extended temperature operation, true CMOS input compatibility, and industry-standard PDIP-14 packaging - making it the only option qualified for harsh-environment bus gating without derating or redesign.
Availability
CD74HC125EG4 is available at Aetrix Electronics and suitable for industrial bus isolation, legacy system interfacing, test equipment signal routing, and automotive diagnostic interface applications requiring stable component supply across extended temperature ranges.
Supply support for CD74HC125EG4 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The CD74HC125EG4 belongs to TI's HC logic family, designed specifically for low-power, wide-voltage, high-reliability digital interfacing in mission-critical industrial and aerospace systems.
FAQ
What is the maximum capacitive load supported by CD74HC125EG4 while maintaining datasheet timing specifications?
The CD74HC125EG4 is characterized for CL = 50 pF in switching characteristics tables, with tpd ≤ 30 ns at 4.5 V. While larger loads (e.g., 70 pF) may be driven, performance degrades beyond this point - VOH drops, VOL rises, and propagation delay increases nonlinearly. For guaranteed compliance, keep total output capacitance ≤ 50 pF including trace and probe contributions.
Does CD74HC125EG4 support hot insertion or live bus connection?
No - CD74HC125EG4 lacks explicit hot-swap protection features such as power-up sequencing control, slew-rate limiting, or bus-fault detection. Its absolute maximum ratings do not cover powered-backplane insertion. To implement hot insertion, external series resistors and TVS diodes must be added per channel, and OE must be held inactive until power stabilizes.
Can unused inputs on CD74HC125EG4 be left floating?
No - floating inputs on CD74HC125EG4 cause undefined logic states, increased ICC, and potential oscillation due to CMOS input structure. All unused A and OE inputs must be tied to VCC or GND using direct connections or ≤10 kΩ pull-up/down resistors, per TI layout guidelines and Section 11.1 of the datasheet.
Is CD74HC125EG4 pin-compatible with CD74HC125M (SOIC-14)?
Yes - both CD74HC125EG4 (PDIP-14) and CD74HC125M (SOIC-14) share identical pin numbering, function mapping, and logic behavior. However, thermal performance differs significantly: RθJA is 62.7°C/W for CD74HC125EG4 versus 133.6°C/W for CD74HC125M, affecting maximum allowable power dissipation in high-ambient environments.
What is the recommended bypass capacitor value and placement for CD74HC125EG4?
A 0.1 µF ceramic capacitor is recommended between VCC (Pin 14) and GND (Pin 7), placed physically adjacent to the device with minimal trace length. TI's layout example (Figure 11-1) shows direct placement near the pins; adding a parallel 1 µF capacitor improves low-frequency noise rejection, especially in noisy industrial power rails.
CD74HC125EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
CD74HC125EG4 FAQ
1.How can I place an order for CD74HC125EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC125EG4 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 CD74HC125EG4 reliable?
The price and inventory of CD74HC125EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC125EG4 is usually 5 days.
3.What payment methods are accepted for CD74HC125EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC125EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC125EG4?
CD74HC125EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC125EG4 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 CD74HC125EG4?
For technical support, including CD74HC125EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC125EG4 requirements.
6.How does Aetrix verify that CD74HC125EG4 is sourced from the original manufacturer or authorized distributors?
All CD74HC125EG4 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 CD74HC125EG4 meets industry standards.
7.What is the process for return or replacement of CD74HC125EG4?
All CD74HC125EG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC125EG4, 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 CD74HC125EG4 part is unused and in its original packaging.
Return procedure for CD74HC125EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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