SN74F125DRE4 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74F125DRE4 is a quad bus buffer gate IC from Texas Instruments with four individual three-state outputs and active-LOW output enable controls, belonging to the F/FAST TTL logic family with 64mA output sink current. It provides unidirectional buffering in a 14-pin SOIC package with 50pF load capacity. Suitable for high-speed digital bus isolation and signal driving in industrial designs.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 14
- Lifecycle
- OBSOLETE
- Datasheet
- SN74F125DRE4 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Quad (4-channel) bus buffer with individual active-LOW output-enable per channel
- High 64mA output sink current for driving heavy capacitive bus loads
- Three-state outputs per channel for bidirectional bus sharing without signal contention
- F/FAST TTL logic family for high-speed operation with low propagation delay
- 14-pin SOIC surface-mount package for compact board designs
- Individual output enables allow selective channel activation for flexible bus control
Applications
The SN74F125DRE4 is used in digital bus isolation, output port expansion, and signal buffering in industrial PLCs, embedded controllers, and high-speed digital backplanes where four independently-controlled three-state buffer channels are needed. It is also deployed in memory interface buffering, chip-select signal distribution, and multi-master bus arbitration circuits requiring strong output drive capability.
Specifications
| YTEOL | 0 |
| Control Type | ENABLE LOW |
| Count Direction | UNIDIRECTIONAL |
| Family | F/FAST |
| JESD-30 Code | R-PDSO-G14 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Logic IC Type | BUS DRIVER |
| Max I(ol) | 0.064A |
| Number of Bits | 1 |
| Number of Functions | 4 |
| Number of Ports | 2 |
| Output Characteristics | 3-STATE |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP14,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 40mA |
| Prop. Delay@Nom-Sup | 8ns |
| Propagation Delay (tpd) | 8ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 5.5V |
| Supply Voltage-Min (Vsup) | 4.5V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | TTL |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.31.00.01 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74F125DRE4:
Bus Driver, F/FAST Series, 4-Func, 1-Bit, True Output, TTL, PDSO14
Frequently Asked Questions
What is the output enable polarity of the SN74F125DRE4 and how does it affect circuit design?
The SN74F125DRE4 uses active-LOW output enable (OE) controls for each of its four buffer gates. When the OE pin is pulled LOW, the corresponding output becomes active and drives the bus. When OE is HIGH, the output enters a high-impedance (tri-state) condition, effectively disconnecting it from the bus. This active-LOW polarity simplifies bus arbitration designs where multiple drivers share a common line, since a logic LOW signal — often easier to assert from open-drain or pull-down circuits — is needed to enable driving. Designers should ensure OE is not left floating, as an indeterminate state can cause bus contention.
What are the key electrical characteristics of the SN74F125DRE4 that determine its drive strength and speed?
The SN74F125DRE4 is part of Texas Instruments' F/FAST TTL logic family, which is optimized for high-speed operation. Its maximum output sink current (I_OL) is 64 mA, giving it strong bus-driving capability suitable for driving heavily loaded data buses. The device is characterized at a load capacitance (C_L) of 50 pF. As a FAST TTL device, propagation delays are typically in the sub-5 ns range, making it appropriate for high-frequency digital systems. The supply voltage is 5 V, and the inputs are TTL-compatible, allowing direct interfacing with other TTL and CMOS logic families operating at 5 V.
In what types of applications is the SN74F125DRE4 commonly used, and what package does it come in?
The SN74F125DRE4 is widely used in applications requiring high-speed bus buffering, signal isolation, and unidirectional data driving. Typical use cases include microprocessor address and data bus buffering, memory interface circuits, industrial control systems, and backplane bus drivers where multiple devices share a common signal path and tri-state control is required to prevent bus contention. The device is packaged in a 14-pin Small Outline IC (SOIC) package (JEDEC JESD-30 code R-PDSO-G14), which offers a compact surface-mount footprint suitable for space-constrained PCB layouts and is compatible with standard automated assembly processes. The 'E4' suffix in the part number denotes RoHS-compliant (lead-free) packaging.
How does the SN74F125DRE4 compare to similar quad bus buffer ICs such as the SN74HC125 or SN74LS125?
The SN74F125DRE4 belongs to the F/FAST TTL family, which offers faster propagation delays than the LS (Low-power Schottky) family and higher output drive current compared to the HC (High-speed CMOS) family. The SN74LS125 operates at a lower output sink current (typically 8 mA I_OL) and slower speeds, making it more suitable for low-power, low-frequency designs. The SN74HC125 operates over a wider supply voltage range (2 V to 6 V) and consumes less static power, but has lower drive strength at 5 V and is more susceptible to noise in TTL-level environments. The SN74F125DRE4 is the preferred choice when maximum speed and strong bus drive capability at 5 V are required, particularly in industrial-grade or legacy high-speed digital designs.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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