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Renesas 74LS125AP-E
- Part No.:
- 74LS125AP-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74LS125AP-E.pdf
- Description:
- 74LS125 QUAD BUS BUFFER GATESS
- Quantity:
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Inventory:1,109
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Product details
Overview
74LS125AP-E from Renesas Electronics is a quadruple bus buffer gate with three-state outputs, designed for bidirectional data bus isolation and signal routing in TTL-compatible digital systems. It features 4 independent channels, 5 V nominal supply operation, ±24 mA low-level output drive, high-impedance (Z) output control via active-low enable inputs, and operates across –20 °C to +75 °C for industrial logic interfacing.
For engineers reviewing the 74LS125AP-E datasheet, 74LS125AP-E pinout, 74LS125AP-E application, or 74LS125AP-E equivalent, key selection criteria include guaranteed 3-state output leakage (≤±20 µA), propagation delay ≤18 ns (tPHL), output disable time ≤20 ns (tLZ), and compatibility with legacy LS-TTL bus architectures requiring controlled driver enable sequencing.
Technical Context
The 74LS125AP-E implements four identical non-inverting buffer stages, each with an independent active-low 3-state enable input (C). Each channel passes A to Y when C = L, and presents high-impedance (Z) when C = H - enabling shared-bus arbitration without external gating logic.
It uses standard bipolar Schottky TTL process technology, delivering guaranteed VOH ≥2.4 V at IOH = –2.6 mA and VOL ≤0.4 V at IOL = 24 mA under VCC = 4.75–5.25 V. Input thresholds VIH ≥2.0 V and VIL ≤0.8 V ensure robust noise margin against LS-TTL logic families.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.75–5.25 V - ensures stable operation within standard TTL rail tolerance, compatible with regulated 5 V systems. |
| Output drive (IOL) | 24 mA - supports direct fan-out to ≥20 LS-TTL loads without buffering. |
| Propagation delay (tPHL) | 7–18 ns - enables reliable timing in 20+ MHz synchronous bus environments with adequate setup/hold margins. |
| 3-state leakage (IOZ) | ±20 µA - guarantees minimal bus contention current during high-Z state, critical for multi-driver arbitration. |
| Operating temperature | –20 to +75 °C - validated for industrial-grade embedded control and instrumentation applications. |
| Input threshold (VIL) | ≤0.8 V - provides ≥0.4 V noise immunity against ground bounce or coupling in dense PCB layouts. |
Pinout & Package
Dual in-line package (DIP-14), 19.2 mm × 6.3 mm body, 2.54 mm pitch, Ni/Pd/Au-plated leads, through-hole mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Enable (C) | Active-low control per channel; drives output to high-impedance when high. |
| 2, 5, 9, 12 | Input (A) | Non-inverting data input for corresponding buffer channel. |
| 3, 6, 8, 11 | Output (Y) | 3-state buffered output; follows A when C = L, high-Z when C = H. |
| 7 | GND | Signal and power reference ground terminal. |
| 14 | VCC | Positive supply terminal (4.75–5.25 V). |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control per channel | Enables selective bus segment isolation without global enable synchronization. |
| Guaranteed high-impedance off-state | IOZ ≤ ±20 µA ensures negligible leakage into shared bus lines during disable. |
| TTL-compatible input thresholds | VIH ≥2.0 V / VIL ≤0.8 V matches LS-TTL family interface requirements precisely. |
| Low propagation skew | tPHL/tPLH matching ≤3 ns between channels minimizes timing skew in parallel data paths. |
Applications
| Microprocessor Bus Interface | Memory Address Buffering |
|---|---|
|
Use Scenario: Isolating address/data buses between CPU and peripheral ICs in 8-bit microcontroller systems. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-line 3-state control to prevent contention during DMA or interrupt-driven transfers. Use Value: Enables clean bus turn-around with ≤20 ns output disable time (tLZ), reducing bus recovery overhead in cycle-stealing architectures. |
Use Scenario: Driving high-capacitance memory address lines (e.g., 64K RAM) from low-drive MCU ports. IC Role / Device Role / Timing Role: Non-inverting buffer with 24 mA sink capability to meet address setup time under 100 pF load. Use Value: Delivers full logic swing (VOH ≥2.4 V, VOL ≤0.4 V) at rated IOL, ensuring reliable decoding across extended trace lengths. |
| Legacy System Logic Expansion | Industrial I/O Module Conditioning |
|
Use Scenario: Adding isolated control lines in retro-computing or test equipment using 74LS-series backplanes. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS125 variants with identical pinout and DC/AC specs. Use Value: Maintains backward compatibility with existing LS-TTL timing budgets and fan-out rules without redesign. |
Use Scenario: Level-shifting and bus-driving for isolated digital I/O in PLC rack modules operating at ambient –20 °C to +75 °C. IC Role / Device Role / Timing Role: Industrial-grade buffer providing ESD-tolerant (VIK = –1.5 V) inputs and robust output drive in noisy factory environments. Use Value: Validated operating temperature range and 400 mW power dissipation rating support continuous operation in convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS125N | Identical logic function, pinout, and DC specs; TI-manufactured with slightly tighter tPLH/tPHL typ values (8/6 ns vs. 9/7 ns). | No functional deviation; suitable for cross-supply in mixed-source BOMs where TI sourcing is preferred. | Select SN74LS125N if dual-sourcing or TI-aligned qualification is required; same PCB layout and firmware logic. |
| 74HCT125N | CMOS-based; 5 V tolerant inputs but requires 4.5–5.5 V VCC; VIH = 3.5 V min, lower ICC (8 µA typ), higher noise immunity. | Not drop-in: incompatible input thresholds and reduced drive (IOL = 4 mA) limit use to low-fanout or mixed-voltage interfaces. | Choose 74HCT125N only when upgrading to CMOS power efficiency is prioritized and bus loading permits reduced drive strength. |
Compared with SN74LS125N, the 74LS125AP-E offers identical functionality with Renesas' industrial temperature validation and JEDEC-standard DIP-14 packaging; versus 74HCT125N, it delivers proven LS-TTL drive and timing behavior essential for legacy bus integrity.
Availability
74LS125AP-E is available at Aetrix Electronics and suitable for microprocessor bus interface, memory address buffering, and legacy system logic expansion requiring stable component supply and long-term industrial availability.
Supply support for 74LS125AP-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 specializing in microcontrollers, analog, and legacy logic solutions for industrial, automotive, and infrastructure markets.
The HD74LS125A product line delivers standardized TTL-compatible bus buffers optimized for reliability, interoperability, and long-lifecycle support in industrial control and retro-system maintenance applications.
FAQ
What is the maximum supply voltage rating for the 74LS125AP-E?
The 74LS125AP-E has an absolute maximum supply voltage (VCC) of 7 V, but its recommended operating range is strictly 4.75 V to 5.25 V. Operation outside this window risks parametric shift or accelerated degradation; sustained use above 5.25 V violates the Recommended Operating Conditions and may compromise output drive stability or timing consistency in the 74LS125AP-E.
Does the 74LS125AP-E support hot insertion or live bus swapping?
No, the 74LS125AP-E does not support hot insertion. Its absolute maximum input voltage (VIN) is 7 V, and input clamp voltage (VIK) is –1.5 V, but no built-in input protection diodes or power sequencing logic are specified. Applying signals before VCC stabilization may cause latch-up or excessive IIH/IIL currents, risking damage to the 74LS125AP-E or connected devices.
What is the output disable time (tLZ) specification for the 74LS125AP-E?
The 74LS125AP-E specifies an output disable time (tLZ) of ≤20 ns under CL = 5 pF and RL = 667 Ω conditions. This value reflects the maximum delay from enable input transition (C rising) to output entering valid high-impedance state, critical for preventing bus contention during multi-driver arbitration in the 74LS125AP-E's intended applications.
Can the 74LS125AP-E drive a 50 pF capacitive load while maintaining timing specs?
No - the 74LS125AP-E switching characteristics (tPLH, tPHL, tZL, tLZ) are characterized only at CL = 45 pF (propagation/enable) and CL = 5 pF (disable). Driving 50 pF exceeds the tested load condition; measured delays will increase beyond datasheet limits, potentially violating setup/hold windows in high-speed bus designs using the 74LS125AP-E.
Is the 74LS125AP-E RoHS compliant?
Yes, the 74LS125AP-E is RoHS compliant. Renesas confirms compliance with EU Directive 2011/65/EU (RoHS 2) for lead-free solderability and restricted substance limits. The device uses Ni/Pd/Au plating on leads and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements appropriate for its DIP-14 package, as verified in official Renesas documentation for the 74LS125AP-E.
74LS125AP-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:
- -
74LS125AP-E FAQ
1.How can I place an order for 74LS125AP-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LS125AP-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 74LS125AP-E reliable?
The price and inventory of 74LS125AP-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LS125AP-E is usually 5 days.
3.What payment methods are accepted for 74LS125AP-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LS125AP-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LS125AP-E?
74LS125AP-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LS125AP-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 74LS125AP-E?
For technical support, including 74LS125AP-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LS125AP-E requirements.
6.How does Aetrix verify that 74LS125AP-E is sourced from the original manufacturer or authorized distributors?
All 74LS125AP-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 74LS125AP-E meets industry standards.
7.What is the process for return or replacement of 74LS125AP-E?
All 74LS125AP-E units undergo pre-shipment inspection (PSI). If there is an issue with 74LS125AP-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 74LS125AP-E part is unused and in its original packaging.
Return procedure for 74LS125AP-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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