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onsemi 74HC125DR2G
- Part No.:
- 74HC125DR2G
- Manufacturer:
- onsemi
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HC125DR2G.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,382
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Product details
Overview
74HC125DR2G from onsemi is a quad 3-state noninverting buffer IC designed for bus-oriented systems including memory address drivers and clock distribution networks. It operates from 2.0 V to 6.0 V, delivers ±35 mA output drive per channel, features active-low independent output enables, and is pin-compatible with LS125 in SOIC-14 package.
For engineers reviewing the 74HC125DR2G datasheet, pinout, applications, or equivalent options, this page provides verified functional specifications, real-world timing behavior at 50 pF load, JEDEC-compliant noise immunity, and validated alternatives for bus buffering in industrial control and embedded interface designs.
Technical Context
The 74HC125DR2G implements four independent CMOS noninverting buffers, each with dedicated active-low 3-state output enable (OE1–OE4). Its high-impedance outputs support bidirectional bus sharing without contention. Input thresholds are compatible with both CMOS and LSTTL logic families when pullup resistors are used.
Propagation delays are specified across temperature (–55°C to +125°C) and supply voltage (2.0 V to 6.0 V), with tPLH/tPHL as low as 15 ns at VCC = 6.0 V and CL = 50 pF. Output transition times remain under 15 ns, and input leakage stays below ±1.0 µA at 6.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered operation down to 2 V. |
| Output Drive Current | ±35 mA per output - sufficient to drive 15 LSTTL loads directly without external buffers. |
| Propagation Delay (VCC = 6.0 V) | 15 ns max (A→Y), 20 ns max (OE→Y) - enables reliable timing in 33 MHz+ bus systems with 50 pF load. |
| Input Leakage Current | ±1.0 µA max at 6.0 V - ensures stable logic levels with high-impedance inputs and minimal power impact. |
| 3-State Output Leakage | ±10 µA max at 6.0 V - prevents unintended current paths during bus arbitration or power sequencing. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments. |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 for robust handling in manufacturing and field service. |
Pinout & Package
74HC125DR2G is supplied in Pb-free SOIC-14 (Case 751A) package, 8.55 mm × 3.80 mm × 1.75 mm body size, with standard 1.27 mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Input A1–A4 | Noninverting data inputs; CMOS- and LSTTL-compatible with pullups. |
| 2, 5, 11, 14 | Output Enable OE1–OE4 | Active-low controls; each independently disables corresponding Y output to high-Z. |
| 3, 6, 12, 9 | Output Y1–Y4 | Buffered noninverted outputs; tri-state capable with <10 µA off-state leakage. |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry. |
| 14 | VCC | Positive supply rail; must be decoupled locally due to dynamic switching current. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent 3-state buffers | Enables flexible bus arbitration-each channel can be enabled/disabled separately without affecting others. |
| CMOS silicon-gate process | Delivers rail-to-rail output swing, near-zero static power, and high noise immunity (>40% VCC). |
| JEDEC Std. 7A compliance | Ensures interoperability with legacy TTL and modern CMOS logic families in mixed-technology systems. |
| Pb-free SOIC-14 packaging | Meets RoHS Directive 2011/65/EU and supports lead-free reflow profiles up to 260°C peak. |
| Low input capacitance | 10 pF max per input - minimizes loading on upstream drivers and preserves signal edge integrity. |
Applications
| Memory Address Bus Driver | Microcontroller Peripheral Interface |
|---|---|
|
Use Scenario: Driving 16-bit address lines from an MCU to multiple SRAM or flash devices sharing a common data/address bus. IC Role / Device Role / Timing Role: Noninverting buffer with per-line 3-state control isolates address latches during bus turnaround. Use Value: Prevents bus contention during multi-device access cycles; ±35 mA drive sustains signal integrity over 10 cm PCB traces. |
Use Scenario: Interfacing a 3.3 V microcontroller GPIO bank to 5 V peripheral ICs (e.g., display controllers, ADCs) requiring level-shifted control signals. IC Role / Device Role / Timing Role: Voltage-tolerant buffer translating logic levels while maintaining timing alignment across four parallel control lines. Use Value: Eliminates need for discrete level shifters; 15 ns propagation delay preserves setup/hold margins in 20 MHz SPI or parallel interfaces. |
| Industrial PLC Backplane Buffer | Legacy System Bus Extender |
|
Use Scenario: Isolating and strengthening I/O module address/data signals on a DIN-rail mounted PLC backplane operating at –40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust bus driver with wide temperature range and high ESD immunity for noisy factory-floor environments. Use Value: –55°C to +125°C rating exceeds industrial spec; 2000 V HBM ESD withstand reduces field failure rates in unshielded enclosures. |
Use Scenario: Replacing obsolete 74LS125 in legacy test equipment where board space and pinout compatibility are mandatory. IC Role / Device Role / Timing Role: Drop-in CMOS upgrade delivering lower power, higher noise margin, and identical SOIC-14 footprint and pin assignment. Use Value: Pin-for-pin replacement with no layout change; 2.0 V min supply enables operation from degraded 5 V rails in aging systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state noninverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC125N | Same logic function and pinout; Texas Instruments version in PDIP-14 package only. | Not suitable for surface-mount production; lacks tape-and-reel packaging and Pb-free certification. | Select when through-hole prototyping or legacy DIP socket compatibility is required. |
| MC74HC125ADTR2G | Identical onsemi device in TSSOP-14 (Case 948G); same electrical specs but 5.0 mm × 4.4 mm footprint. | Requires PCB redesign for smaller pad pitch (0.65 mm vs. 1.27 mm); better thermal performance at high density. | Select when board space is constrained and reflow profile supports fine-pitch components. |
Compared with SN74HC125N and MC74HC125ADTR2G, the 74HC125DR2G offers optimal balance of surface-mount compatibility, Pb-free compliance, and drop-in replacement capability for SOIC-based designs without layout revision.
Availability
74HC125DR2G is available at Aetrix Electronics and suitable for industrial control systems, embedded microcontroller interfaces, and legacy system upgrades requiring stable component supply and long-term lifecycle support.
Supply support for 74HC125DR2G 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications.
The 74HC125DR2G belongs to the HC High-Speed CMOS logic family, engineered for low-power, high-noise-immunity digital interfacing in resource-constrained and thermally demanding environments.
FAQ
What is the maximum operating frequency supported by the 74HC125DR2G?
The 74HC125DR2G does not specify a maximum clock frequency, but its propagation delay (15 ns max at VCC = 6.0 V, CL = 50 pF) supports reliable operation in bus systems up to approximately 33 MHz. Actual usable frequency depends on load capacitance, trace routing, and supply stability-designers should verify timing margins using worst-case AC parameters from the datasheet.
Is the 74HC125DR2G pin-compatible with the 74LS125?
Yes, the 74HC125DR2G is explicitly designed to be pin-compatible with the 74LS125, sharing identical SOIC-14 pin assignments and logic functionality. This allows direct replacement in existing LS-based designs while delivering improved noise immunity, wider supply range (2.0–6.0 V), and lower static power consumption.
Can unused inputs on the 74HC125DR2G be left floating?
No, unused inputs on the 74HC125DR2G must be tied to a defined logic level-either VCC or GND-to prevent oscillation, excessive current draw, or unpredictable output states. The datasheet mandates this practice due to the high-impedance CMOS inputs, which are susceptible to noise-induced switching if left unconnected.
Does the 74HC125DR2G support mixed-voltage operation between input and output sides?
No, the 74HC125DR2G does not provide level-shifting functionality. All inputs and outputs operate referenced to the same VCC rail (2.0–6.0 V). To interface between different voltage domains (e.g., 3.3 V MCU to 5 V peripheral), external voltage translation or compatible I/O standards must be used alongside the 74HC125DR2G.
What is the thermal resistance (θJA) of the 74HC125DR2G in SOIC-14 package?
The 74HC125DR2G in SOIC-14 (Case 751A) has a junction-to-ambient thermal resistance (θJA) of 140°C/W under standard JEDEC test conditions (1s² copper pad). Derating is required above 65°C ambient: –7 mW/°C from 65°C to 125°C, limiting safe continuous power dissipation to ~450 mW at maximum operating temperature.
74HC125DR2G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
74HC125DR2G FAQ
1.How can I place an order for 74HC125DR2G through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC125DR2G 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 74HC125DR2G reliable?
The price and inventory of 74HC125DR2G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC125DR2G is usually 5 days.
3.What payment methods are accepted for 74HC125DR2G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC125DR2G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC125DR2G?
74HC125DR2G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC125DR2G 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 74HC125DR2G?
For technical support, including 74HC125DR2G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC125DR2G requirements.
6.How does Aetrix verify that 74HC125DR2G is sourced from the original manufacturer or authorized distributors?
All 74HC125DR2G 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 74HC125DR2G meets industry standards.
7.What is the process for return or replacement of 74HC125DR2G?
All 74HC125DR2G units undergo pre-shipment inspection (PSI). If there is an issue with 74HC125DR2G, 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 74HC125DR2G part is unused and in its original packaging.
Return procedure for 74HC125DR2G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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