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Texas Instruments SN74F125DR
- Part No.:
- SN74F125DR
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74F125DR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,245
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Product details
Overview
SN74F125DR from Texas Instruments is a quadruple 3-state bus buffer gate IC used for bidirectional data isolation and memory address register buffering in TTL-compatible digital systems. It features four independent noninverting buffers, each with separate output-enable (OE) control, 5 V nominal supply operation, 6.5 ns max propagation delay at 5 V/50 pF, and ±64 mA low-state output drive capability.
For engineers reviewing the SN74F125DR datasheet, SN74F125DR pinout, SN74F125DR application, or SN74F125DR equivalent, this device is selected for legacy TTL bus interfacing, address/data line isolation in microcontroller-based peripherals, and 3-state bus arbitration where logic-level compatibility and fast enable/disable timing are critical.
Technical Context
The SN74F125DR implements four identical noninverting buffer stages, each with dedicated active-low output-enable control. Its 3-state outputs support high-impedance disconnection to prevent bus contention during shared-bus operation.
Designed for 5 V TTL logic families, it operates across 0°C to 70°C with supply voltage range 4.5–5.5 V, supports 64 mA sink current per output, and delivers tPLH/tPHL ≤ 6.5 ns and tPZL/tPHZ ≤ 6 ns under loaded conditions (CL = 50 pF, RL = 500 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (VCC) | 4.5 V to 5.5 V - Ensures stable operation within standard TTL power rail tolerances. |
| Propagation Delay (tPLH/tPHL) | ≤ 6.5 ns at VCC = 4.5–5.5 V, CL = 50 pF - Enables reliable timing in 100+ MHz bus clock domains. |
| Output Drive (IOL) | 64 mA per channel - Sufficient to drive 10 standard TTL loads or terminate short stubs on PCB traces. |
| 3-State Enable/Disable Time | tPZL ≤ 9 ns, tPHZ ≤ 6 ns - Minimizes bus turnaround latency during multi-master arbitration. |
| Input Thresholds (VIH/VIL) | VIH ≥ 2.0 V, VIL ≤ 0.8 V - Guarantees noise-immune recognition of TTL logic levels. |
| Quiescent Current (ICCL) | 28–40 mA at VCC = 5.5 V - Predictable power budgeting for legacy board-level power design. |
Pinout & Package
SN74F125DR is housed in a 14-pin SOIC (D) package with 1.27 mm pitch, 8.75 mm × 3.91 mm body, and 1.75 mm max height. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (OE) | Active-Low Output Enable | Each independently disables its corresponding buffer output to high-impedance state when high. |
| 2, 5, 11, 14 (A) | Buffer Input | Noninverting data input for respective buffer stage; accepts TTL-compatible logic levels. |
| 3, 6, 12, 9 (Y) | Buffer Output | 3-state output delivering inverted-pass-through signal; sinks up to 64 mA when low. |
| 7 (GND) | Ground Reference | Primary return path for all internal logic and output currents; must be low-impedance. |
| 14 (VCC) | Power Supply | +5 V supply input; requires local 0.1 µF ceramic decoupling adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-State Control | Four separate OE inputs allow selective activation of individual buffers without affecting others - essential for partial bus gating. |
| TTL-Compatible Interface | VIH/VIL thresholds and output drive match standard 74LS/74F logic families - enables drop-in replacement in legacy designs. |
| Fast Enable/Disable Timing | tPZL ≤ 9 ns and tPHZ ≤ 6 ns ensure minimal bus float time during state transitions - reduces risk of metastability in shared-bus systems. |
| Robust Absolute Ratings | Withstands –0.5 V to 7 V on VCC and –1.2 V to 7 V on inputs - accommodates transient overshoot and mixed-voltage test conditions. |
Applications
| Memory Address Buffering | Legacy Microprocessor Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address lines from peripheral address decoders in 8-bit embedded systems using Z80 or 8085 processors. IC Role / Device Role / Timing Role: Noninverting buffer with per-line 3-state control ensures clean address latching while preventing backdrive during DMA cycles. Use Value: Eliminates address bus contention during interrupt-driven I/O transfers, enabling deterministic timing in real-time firmware. |
Use Scenario: Separating data bus segments between microcontroller and external SRAM or EPROM in industrial control panels. IC Role / Device Role / Timing Role: Bidirectional bus driver with fast disable timing prevents signal corruption when multiple masters access shared memory space. Use Value: Reduces bus turnaround delay to <10 ns, supporting sustained 8 MHz bus throughput without added wait states. |
| Peripheral Interface Multiplexing | TTL-Level Logic Level Translation |
|
Use Scenario: Sharing a single 8-bit data bus among UART, ADC, and display controller in a cost-sensitive instrumentation module. IC Role / Device Role / Timing Role: Quad buffer provides independent gating for each peripheral's data path under software-controlled OE signals. Use Value: Enables dynamic reconfiguration of bus topology via firmware - no hardware jumper changes required. |
Use Scenario: Interfacing 5 V TTL logic to older 3.3 V or 5 V CMOS peripherals where level-shifting ICs are unavailable. IC Role / Device Role / Timing Role: Acts as passive voltage translator leveraging TTL input thresholds and robust output drive into CMOS inputs. Use Value: Supports reliable communication with devices requiring VIH ≥ 2.0 V while maintaining full 64 mA sink capability for pull-down assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS125N | Lower drive (IOL = 24 mA), slower propagation (tPLH ≤ 15 ns), higher ICCZ (30 mA typical) | Better suited for low-power, low-speed legacy boards where fanout > 10 not required | Select when minimizing quiescent current outweighs speed requirements and load drive is ≤ 24 mA. |
| SN74ACT125DR | CMOS input (VIH = 3.5 V), wider VCC range (4.5–5.5 V), lower ICC (10 µA typ), faster tPLH (3.5 ns) | Requires compatible CMOS-level signaling; unsuitable for direct 74F/74LS input drive | Choose for new designs needing lower power and higher speed, provided upstream logic meets ACT input thresholds. |
Compared with SN74F125DR, SN74LS125N trades speed and drive strength for reduced static power, while SN74ACT125DR offers superior performance but demands CMOS-compatible input sourcing - neither is pin-compatible without verifying OE polarity and loading behavior.
Availability
SN74F125DR is available at Aetrix Electronics and suitable for memory address buffering, legacy microprocessor bus isolation, and peripheral interface multiplexing requiring stable component supply and long-term obsolescence management.
Supply support for SN74F125DR 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.
The SN74F125DR belongs to TI's 74F logic family - engineered for high-speed TTL-compatible operation in legacy computing, instrumentation, and control systems where reliability and interoperability with established 5 V logic standards are paramount.
FAQ
What is the operating temperature range for SN74F125DR?
The SN74F125DR is rated for operation from 0°C to 70°C ambient temperature. This commercial-grade specification aligns with standard TTL system environments and excludes extended industrial or automotive ranges. All recommended electrical characteristics - including propagation delay, output drive, and input thresholds - are guaranteed only within this interval. The SN74F125DR does not support operation below 0°C or above 70°C without derating or validation.
Does SN74F125DR support hot-swap or live-insertion?
No, SN74F125DR is not designed for hot-swap operation. Its absolute maximum ratings do not include powered insertion sequences, and the device lacks bus-hold or power-up/down protection circuitry. Applying VCC before establishing GND, or connecting inputs while VCC is absent, may exceed VI or IO limits and cause latch-up or permanent damage. The SN74F125DR must be powered and stabilized before signal application.
Can SN74F125DR drive more than 10 TTL loads per output?
No - SN74F125DR is specified to drive up to 10 standard TTL loads (each drawing 1.6 mA high-state input current) per output, consistent with its IOL = 64 mA and IOH = –15 mA ratings. Exceeding this fanout risks violating VOH ≥ 2.4 V or VOL ≤ 0.55 V under worst-case conditions. For higher fanout, the SN74F125DR requires external buffering or parallel staging, not direct connection.
Is SN74F125DR RoHS compliant?
Yes, SN74F125DR is RoHS compliant, with lead finish NIPDAU (nickel/palladium/gold) and MSL Level-1 rating (unlimited floor life at ≤30°C/60% RH). TI's packaging documentation confirms "Yes" for RoHS status, and the device meets EU Directive 2011/65/EU requirements. No exemptions apply, and the SN74F125DR contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits.
How does SN74F125DR differ from SN74F126DR?
The SN74F125DR features noninverting buffers with active-low OE, while SN74F126DR provides inverting buffers with active-high OE - making them functionally distinct. Their pinouts are identical, but logic polarity and control signal polarity differ. Using SN74F126DR in place of SN74F125DR would invert all data paths and reverse OE logic, causing functional failure unless compensated in firmware or external logic. The SN74F125DR and SN74F126DR are not interchangeable without redesign.
SN74F125DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74F
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74F125DR FAQ
1.How can I place an order for SN74F125DR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74F125DR 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 SN74F125DR reliable?
The price and inventory of SN74F125DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F125DR is usually 5 days.
3.What payment methods are accepted for SN74F125DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F125DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74F125DR?
SN74F125DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74F125DR 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 SN74F125DR?
For technical support, including SN74F125DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F125DR requirements.
6.How does Aetrix verify that SN74F125DR is sourced from the original manufacturer or authorized distributors?
All SN74F125DR 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 SN74F125DR meets industry standards.
7.What is the process for return or replacement of SN74F125DR?
All SN74F125DR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F125DR, 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 SN74F125DR part is unused and in its original packaging.
Return procedure for SN74F125DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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