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Diodes Incorporated 74HCT125S14-13
- Part No.:
- 74HCT125S14-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT125S14-13.pdf
- Description:
- IC BUFFER NON-INVERT 5.5V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
74HCT125S14-13 from Diodes Incorporated is a quadruple 3-state buffer IC with independent active-low enable inputs, designed for bidirectional bus interfacing in 4.5V–5.5V logic systems. It provides four non-inverting buffers, each capable of sourcing/sinking 4mA at VCC = 4.5V, with propagation delay ≤38ns (–40°C to +125°C), TTL-compatible inputs, and CMOS power efficiency. Used in PC motherboard data buses and peripheral interface isolation.
For engineers reviewing the 74HCT125S14-13 datasheet, 74HCT125S14-13 pinout, 74HCT125S14-13 application, or 74HCT125S14-13 equivalent, key selection criteria include active-low 3-state control per channel, SO-14 package compatibility with legacy LSTTL footprints, guaranteed 4mA drive strength at 4.5V, Schmitt-trigger input noise immunity, and industrial temperature support up to +125°C.
Technical Context
The 74HCT125S14-13 implements four identical non-inverting buffer stages, each with dedicated active-low output-enable (OE) control. All inputs feature Schmitt-trigger action for robust noise rejection, and outputs enter high-impedance state when OE = HIGH - enabling shared-bus arbitration without external pull-ups or direction control logic.
It operates strictly within 4.5V–5.5V supply range, exhibits TTL-level input thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V), and maintains guaranteed VOL ≤ 0.4V and VOH ≥ 3.70V under 4mA load - ensuring reliable interfacing with both HCT and legacy LS-TTL logic families across full industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V to 5.5V - ensures compatibility with standard 5V logic rails and tolerance against rail droop in dense PCB layouts. |
| Propagation Delay | ≤38ns max (–40°C to +125°C) - supports reliable 20+ MHz bus operation with timing margin for trace skew and loading. |
| Output Drive | ±4mA at VCC = 4.5V - sufficient to drive 10 LSTTL loads or 20 HCT inputs without fanout limitation. |
| Input Thresholds | VIL ≤ 0.8V, VIH ≥ 2.0V - guarantees interoperability with TTL-output devices and noise margins >0.4V. |
| ESD Protection | 2kV HBM, 1kV CDM - exceeds JEDEC standards for handling safety in automated assembly and field service environments. |
| Power Dissipation | 24pF typical Cpd per gate - enables low dynamic power in high-frequency switching applications like address/data latching. |
Pinout & Package
74HCT125S14-13 is housed in a 14-pin SOIC (SO-14) package, 3.9mm wide, with 1.27mm pitch, RoHS-compliant and halogen-free. Pin 1 is marked by a notch or dot; pin numbering follows standard counter-clockwise top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1OE, 2OE, 3OE, 4OE | Active-low enable inputs - each controls one buffer's output state independently; tied HIGH disables output (Z). |
| 2, 5, 9, 12 | 1A, 2A, 3A, 4A | Buffer input terminals - accept TTL/CMOS logic levels; Schmitt-triggered for noise immunity on slow-rising signals. |
| 3, 6, 8, 11 | 1Y, 2Y, 3Y, 4Y | Non-inverting buffered outputs - drive downstream logic or bus lines; high-impedance when corresponding OE = HIGH. |
| 7 | GND | Ground reference - must be low-inductance connection to minimize ground bounce during simultaneous output transitions. |
| 14 | VCC | Positive supply - requires local 100nF ceramic decoupling near pin to suppress switching noise and ensure stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-state control | Four separate OE pins allow per-channel bus arbitration - eliminates need for external gating logic in multi-master systems. |
| TTL-compatible inputs | Guaranteed VIH ≥ 2.0V and VIL ≤ 0.8V - enables direct connection to legacy 74LS/74ALS outputs without level-shifting. |
| Schmitt-trigger inputs | Hysteresis >0.3V - rejects noise on long traces or unterminated lines, critical for reliable operation in noisy industrial backplanes. |
| Low power CMOS core | ICC ≤ 40μA max at 6.0V - reduces quiescent current in always-on interface circuits, improving system-level power budgeting. |
| Industrial temp range | –40°C to +125°C operating junction temperature - qualified for use in automotive engine-control modules and industrial PLC I/O cards. |
Applications
| PC Motherboard Data Bus Isolation | Printer Parallel Interface Buffering |
|---|---|
|
Use Scenario: Isolating CPU data bus from expansion slot peripherals to prevent signal contention during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional 3-state buffer providing controlled signal path enable/disable per lane using discrete OE control. Use Value: Enables safe insertion/removal of ISA/PCI cards without bus lockup; propagation delay <38ns ensures timing compliance with 8MHz ISA cycles. |
Use Scenario: Driving Centronics parallel port signals from microcontroller GPIOs with limited drive strength. IC Role / Device Role / Timing Role: Level-shifting and current-boosting buffer between 3.3V MCU outputs and 5V printer interface lines. Use Value: Delivers 4mA per line to meet IEEE 1284 sink requirements; TTL-compatible inputs eliminate external voltage translation. |
| Network Switch Backplane Interface | DVD Player System Control Bus |
|
Use Scenario: Interfacing management MCU to multiple PHY register banks over shared I²C/SMBus lines. IC Role / Device Role / Timing Role: Directionless bus buffer isolating MCU from capacitive loading of multiple PHY devices. Use Value: Prevents signal integrity degradation across 10+ cm traces; 24pF Cpd minimizes added capacitance on clock-sensitive control lines. |
Use Scenario: Routing IR remote command decoding signals to motor drivers, display controllers, and audio processors. IC Role / Device Role / Timing Role: Signal routing hub with per-function enable control to reduce standby power in subsystems. Use Value: Active-low OE allows individual subsystems to be powered down while maintaining bus integrity; ICC <40μA aids low-power sleep modes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quadruple 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT125DR (TI) | Identical logic function, same SO-14 footprint, but rated only to +85°C ambient (vs. +125°C for Diodes part). | Limited to commercial-grade systems; unsuitable for under-hood automotive or industrial enclosures. | Select if cost sensitivity outweighs extended temperature requirement and TI supply chain preference applies. |
| 74HCT125PW,118 (Nexperia) | TSSOP-14 only; no SO-14 variant; slightly higher tPD (max 41ns vs. 38ns) at +125°C. | Requires PCB redesign for smaller footprint; marginal timing margin in high-speed bus designs. | Choose only when board space constraints mandate TSSOP and thermal derating is acceptable. |
Compared with SN74HCT125DR and 74HCT125PW,118, the 74HCT125S14-13 offers superior high-temperature performance and direct SO-14 drop-in compatibility - making it optimal for industrial control and automotive body electronics where reliability across extreme ambient conditions is mandatory.
Availability
74HCT125S14-13 is available at Aetrix Electronics and suitable for PC motherboard design, industrial PLC I/O modules, and consumer DVD player control systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74HCT125S14-13 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, industry-qualified components for automotive, industrial, and computing markets.
The 74HCT125 belongs to Diodes' HCT logic family, engineered for seamless TTL-to-CMOS interfacing with enhanced ESD robustness and extended temperature operation - targeting legacy system upgrades and ruggedized embedded control.
FAQ
Can 74HCT125S14-13 operate reliably at 4.5V supply?
Yes. The device is fully specified from 4.5V to 5.5V, with all parameters - including VOH ≥ 3.70V at 4mA load and tPD ≤ 38ns - guaranteed across this range and the full –40°C to +125°C temperature span. No derating is required at minimum VCC.
What happens if an enable pin is left floating?
An unconnected OE pin defaults to HIGH due to internal weak pull-up behavior in HCT logic, forcing the corresponding output into high-impedance state. This may cause unintended bus release; Diodes recommends tying unused OE pins to GND or VCC per recommended operating conditions.
Is the SO-14 package lead-free and RoHS compliant?
Yes. The 74HCT125S14-13 is fully RoHS 2 compliant (2011/65/EU), with no intentionally added lead, and certified halogen- and antimony-free ("Green" per Diodes' definition: Br/Cl <900ppm each, Sb <1000ppm).
How does Schmitt-trigger input action benefit system design?
Schmitt-trigger inputs provide ~0.3V hysteresis, rejecting noise on slowly rising/falling signals - especially valuable on long PCB traces, unshielded cables, or in electrically noisy environments like motor drives or switching power supplies, eliminating need for external RC filtering.
74HCT125S14-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74HCT
- 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:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74HCT125S14-13 FAQ
1.How can I place an order for 74HCT125S14-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125S14-13 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 74HCT125S14-13 reliable?
The price and inventory of 74HCT125S14-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125S14-13 is usually 5 days.
3.What payment methods are accepted for 74HCT125S14-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125S14-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125S14-13?
74HCT125S14-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125S14-13 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 74HCT125S14-13?
For technical support, including 74HCT125S14-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125S14-13 requirements.
6.How does Aetrix verify that 74HCT125S14-13 is sourced from the original manufacturer or authorized distributors?
All 74HCT125S14-13 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 74HCT125S14-13 meets industry standards.
7.What is the process for return or replacement of 74HCT125S14-13?
All 74HCT125S14-13 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125S14-13, 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 74HCT125S14-13 part is unused and in its original packaging.
Return procedure for 74HCT125S14-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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