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Renesas 74LS125AFP-E
- Part No.:
- 74LS125AFP-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74LS125AFP-E.pdf
- Description:
- 74LS125 QUAD BUS BUFFER GATESS
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Product details
Overview
74LS125AFP-E from Renesas Electronics is a quadruple bus buffer gate with three-state outputs, used for bidirectional data bus isolation and signal routing in TTL-level digital systems. It features 4 independent channels, 5 V nominal supply, ±24 mA low-level output drive, 15 ns max propagation delay, and operates from –20°C to +75°C in SOP-14 package.
For engineers reviewing the 74LS125AFP-E datasheet, 74LS125AFP-E pinout, 74LS125AFP-E application, or 74LS125AFP-E equivalent, this page delivers verified electrical specs, functional truth table, real-world use cases in bus arbitration and level translation, and two validated alternative parts with documented differences.
Technical Context
The 74LS125AFP-E implements four identical non-inverting buffers, each with an active-low enable input (C) controlling high-impedance (Z) output state. Its logic conforms to standard TTL voltage thresholds: VIH ≥ 2.0 V, VIL ≤ 0.8 V, VOH ≥ 2.4 V at –2.6 mA, VOL ≤ 0.4 V at 24 mA.
Switching performance is characterized at VCC = 5 V and Ta = 25°C: tPLH/tPHL ≤ 15/18 ns, tZH/tZL ≤ 20/25 ns into 45 pF load. Output disable time (tHZ/tLZ) is ≤ 20 ns, supporting fast bus release in shared-data environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures compatibility with legacy 74LS system designs and predictable noise margins |
| Supply Voltage | 4.75–5.25 V - requires stable 5 V rail; operation outside this range risks undefined behavior or damage |
| Output Drive | IOL = 24 mA / IOH = –2.6 mA - sufficient to drive 10 LS-TTL loads or one standard CMOS input |
| Propagation Delay | tPHL ≤ 18 ns, tPLH ≤ 15 ns - enables reliable operation up to ~30 MHz bus toggle rates |
| Three-State Enable | Active-low C input per channel - allows independent control of bus drivers without external gating logic |
| Operating Temp | –20°C to +75°C - rated for commercial/industrial ambient environments, not extended automotive or military |
| Input Clamp Voltage | VIK = –1.5 V - protects against negative transients up to –1.5 V without external diodes |
Pinout & Package
SOP-14 (JEITA-compliant FP-14DAV package), 5.5 mm × 10.06 mm body, 1.27 mm pitch, Ni/Pd/Au-plated leads, mass ≈ 0.23 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel Enable (C) | Active-low control: drives output to high-Z when logic low; no effect on input |
| 2, 5, 9, 12 | Input (A) | Non-inverting data input per channel; TTL-compatible threshold and loading |
| 3, 6, 8, 11 | Output (Y) | Three-state buffered output; high-Z when corresponding C = L, else Y = A |
| 7 | GND | Signal and power reference ground - must be low-impedance connection to minimize noise coupling |
| 14 | VCC | +5 V supply - bypass capacitor (0.1 µF ceramic) required near pin for stable switching |
Key Features
| Feature | Design Value |
|---|---|
| Independent three-state control per channel | Enables selective bus segment isolation without multiplexers or additional logic gates |
| TTL-compatible input/output levels | Guarantees interoperability with 74LS, 74S, and 74F families without level-shifting circuitry |
| High sink current capability (24 mA) | Supports direct driving of LEDs, relays, or multiple TTL inputs without external buffers |
| Low propagation delay variation | Max tPHL–tPLH skew < 3 ns ensures synchronous bus release across all four channels |
| Input clamp diode protection | Allows safe handling of –1.5 V transient inputs without external protection components |
Applications
| Microprocessor Bus Isolation | Digital Test Equipment Signal Routing |
|---|---|
Use Scenario: Isolating address/data buses between CPU and peripheral ICs during DMA or interrupt cycles. IC Role / Device Role / Timing Role: Bidirectional buffer with per-channel enable, providing controlled bus access and preventing contention. Use Value: Eliminates need for discrete logic or complex bus arbiter design; supports clean bus release within 25 ns. | Use Scenario: Switching test signals between multiple DUTs (devices under test) in automated test fixtures. IC Role / Device Role / Timing Role: Signal path selector using three-state outputs to avoid loading inactive paths. Use Value: Reduces crosstalk and signal degradation by ensuring only one output drives the test node at a time. |
| Legacy System Logic Expansion | Industrial Control I/O Buffering |
Use Scenario: Adding extra TTL-compatible outputs to aging PLC or CNC controller boards with limited drive strength. IC Role / Device Role / Timing Role: Level-restoring buffer that regenerates TTL waveforms and increases fan-out capacity. Use Value: Enables connection of up to 10 LS-TTL loads per channel while maintaining timing integrity. | Use Scenario: Interfacing microcontroller GPIOs to noisy industrial sensors or actuators requiring higher current drive. IC Role / Device Role / Timing Role: Robust interface buffer with 24 mA sink capability and transient input protection. Use Value: Withstands –1.5 V input transients and drives 12 V relay coils via open-collector interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS125N | DIP-14 package; identical electrical specs; no JEDEC-compliant SOP variant | Preferred for through-hole prototyping or legacy board repair where SOP rework is impractical | Select SN74LS125N when manual soldering or socket-based testing is required. |
| 74HC125PW | CMOS family; 2–6 V supply; VIH = 3.5 V min; lower ICC (< 4 µA); 10 ns typical tPD | Requires level translation when interfacing with pure TTL systems; unsuitable for direct 5 V TTL bus loading | Choose 74HC125PW only in mixed-voltage or low-power systems with proper input conditioning. |
Compared with SN74LS125N and 74HC125PW, the 74LS125AFP-E offers JEITA-standard SOP packaging for surface-mount production, guaranteed LS-TTL compatibility without translation, and proven robustness in industrial temperature ranges - making it optimal for volume-manufactured legacy-compatible systems.
Availability
74LS125AFP-E is available at Aetrix Electronics and suitable for microprocessor bus isolation, digital test equipment signal routing, and legacy system logic expansion requiring stable component supply and long-term industrial availability.
Supply support for 74LS125AFP-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 formed in 2010 via merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and legacy logic solutions.
The HD74LS125A product line was designed specifically to provide pin- and function-compatible replacements for classic 74LS-series logic in industrial and commercial equipment upgrades and repairs.
FAQ
What is the operating temperature range for the 74LS125AFP-E?
The 74LS125AFP-E is specified for operation from –20°C to +75°C, meeting commercial and industrial ambient requirements. This range is confirmed in the Recommended Operating Conditions table of the official Renesas datasheet (Rev. 2.00, Feb. 2005). Operation outside this range may result in timing violations or output instability. The 74LS125AFP-E does not support extended temperature grades such as –40°C to +85°C.
Does the 74LS125AFP-E have built-in input protection diodes?
Yes, the 74LS125AFP-E includes input clamp diodes, with a specified input clamp voltage (VIK) of –1.5 V at –18 mA. This allows the device to safely tolerate negative input transients down to –1.5 V without external protection. This feature is explicitly listed in the Electrical Characteristics table of the Renesas HD74LS125A datasheet and applies directly to the 74LS125AFP-E variant.
Is the 74LS125AFP-E pin-compatible with other 74LS125 variants like the SN74LS125N?
Yes - the 74LS125AFP-E shares identical pinout and logic function with all standard 74LS125 variants, including SN74LS125N (DIP-14) and HD74LS125AP (DIP-14). Pin numbering and terminal roles (VCC, GND, A/C/Y per channel) match exactly per the top-view pin arrangement diagram in the Renesas datasheet. Only package type (SOP-14 vs. DIP-14) differs; no PCB layout changes are needed beyond footprint adaptation.
What is the maximum capacitive load the 74LS125AFP-E can drive reliably?
The 74LS125AFP-E is characterized for CL = 45 pF in its Switching Characteristics table, with tPLH/tPHL and tZH/tZL values guaranteed under that condition. Driving loads significantly above 45 pF will increase propagation and enable/disable delays nonlinearly and may cause waveform rounding or timing margin loss. For >50 pF loads, derating or buffering is recommended. The 74LS125AFP-E datasheet does not specify performance beyond 45 pF.
Can the 74LS125AFP-E be used with a 3.3 V supply?
No - the 74LS125AFP-E is an LS-TTL device requiring a nominal 5 V supply, with absolute maximum VCC = 7 V and recommended operating range of 4.75–5.25 V. Supplying 3.3 V will result in undefined logic thresholds, insufficient output swing (VOH < 2.4 V), and potential failure to drive downstream TTL inputs. Use 74LVC125 or similar 3.3 V–tolerant logic for that voltage domain instead of the 74LS125AFP-E.
74LS125AFP-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- -
- Number of Elements:
- -
- Number of Bits per Element:
- -
- Input Type:
- -
- Output Type:
- -
- Current - Output High, Low:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
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74LS125AFP-E FAQ
1.How can I place an order for 74LS125AFP-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LS125AFP-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 74LS125AFP-E reliable?
The price and inventory of 74LS125AFP-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LS125AFP-E is usually 5 days.
3.What payment methods are accepted for 74LS125AFP-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LS125AFP-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LS125AFP-E?
74LS125AFP-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LS125AFP-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 74LS125AFP-E?
For technical support, including 74LS125AFP-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LS125AFP-E requirements.
6.How does Aetrix verify that 74LS125AFP-E is sourced from the original manufacturer or authorized distributors?
All 74LS125AFP-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 74LS125AFP-E meets industry standards.
7.What is the process for return or replacement of 74LS125AFP-E?
All 74LS125AFP-E units undergo pre-shipment inspection (PSI). If there is an issue with 74LS125AFP-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 74LS125AFP-E part is unused and in its original packaging.
Return procedure for 74LS125AFP-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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