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Nexperia USA Inc. 74HCT125DB,118
- Part No.:
- 74HCT125DB,118
- Manufacturer:
- Nexperia USA Inc.
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HCT125DB,118.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,343
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Product details
Overview
74HCT125DB,118 from Nexperia is a quad 3-state buffer/line driver with TTL-compatible inputs and CMOS outputs, operating from 4.5 V to 5.5 V supply, delivering propagation delay of 15–38 ns (VCC = 4.5 V, CL = 50 pF), and supporting industrial temperature range (−40 °C to +125 °C) for bus isolation in microcontroller peripheral interfaces.
For engineers reviewing the 74HCT125DB,118 datasheet, 74HCT125DB,118 pinout, 74HCT125DB,118 application, or 74HCT125DB,118 equivalent, key selection criteria include TTL-level input compatibility, 3-state output enable timing (enable/disable ≤ 42 ns), SO14 package thermal derating (10.1 mW/K above 100 °C), and IEC 61000-4-2 ESD robustness (HBM > 2000 V).
Technical Context
This device implements four independent non-inverting buffers, each with active-low 3-state output enable (1OE–4OE). Each channel isolates bidirectional data paths via high-impedance OFF-state (Z) when its OE is HIGH, enabling shared-bus arbitration without external logic.
Input clamping diodes allow safe interfacing to voltages exceeding VCC when used with current-limiting resistors. Static drive capability is ±6 mA at VCC = 4.5 V, with guaranteed VOH ≥ 3.7 V and VOL ≤ 0.4 V across full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5 V TTL logic families and stable operation under rail tolerance. |
| Propagation Delay | 15–38 ns - determines maximum data rate on shared buses (e.g., ≤ 26 MHz for 38 ns worst-case round-trip). |
| Enable/Disable Time | 15–42 ns - defines minimum bus turnaround time between master/slave transmissions. |
| Output Drive | ±6 mA - supports direct connection to standard 50 pF loads and multiple CMOS/TTL inputs without buffering. |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees reliable recognition of TTL logic levels across temperature. |
| ESD Protection | HBM > 2000 V, CDM > 1000 V - enables handling in standard assembly environments without special ESD controls. |
| Operating Temperature | −40 °C to +125 °C - qualified for under-hood automotive modules and industrial motor control PCBs. |
Pinout & Package
74HCT125DB,118 is housed in a plastic small outline package (SO14, SOT108-1) with 14 leads and 3.9 mm body width. The package supports surface-mount reflow and meets JEDEC MS-012 mechanical standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (1OE–4OE) | Active-low output enable | Each independently disables its associated buffer output to high-impedance state; critical for bus contention avoidance. |
| 2, 5, 9, 12 (1A–4A) | Data input | Non-inverting input per channel; accepts TTL-level signals directly without level-shifting circuitry. |
| 3, 6, 8, 11 (1Y–4Y) | Data output | CMOS-output buffer stage; drives bus lines with rail-to-rail swing and low output impedance (< 50 Ω typical). |
| 7 | GND | Reference ground for all I/O and internal logic; must be low-inductance connection to minimize switching noise. |
| 14 | VCC | Primary power supply; decoupling capacitor (100 nF ceramic) required within 5 mm for stable transient response. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts standard 0.8 V / 2.0 V thresholds - eliminates need for external level translators when interfacing with legacy 5 V microcontrollers. |
| 3-state output control | Four independent active-low OE pins - enables dynamic bus sharing among multiple peripherals without external multiplexers. |
| Clamped input protection | Integrated diodes allow safe overvoltage (up to VCC + 0.5 V) with external current limiting - simplifies interface to higher-voltage sensors or DACs. |
| Wide temperature operation | Specified from −40 °C to +125 °C - supports deployment in engine control units, industrial PLC backplanes, and outdoor telecom equipment. |
| Low static power | ICC ≤ 160 μA at +125 °C - reduces system standby current and thermal load in battery-backed or fanless designs. |
Applications
| Microcontroller Bus Isolation | Industrial I/O Expansion |
|---|---|
|
Use Scenario: Isolating GPIO expansion ports on an ARM Cortex-M4 MCU from a shared 8-bit parallel bus connected to multiple ADCs and DACs. IC Role / Device Role / Timing Role: Quad buffer provides per-channel 3-state control to prevent bus contention during simultaneous read/write cycles. Use Value: Enables deterministic bus arbitration with <42 ns enable/disable latency, eliminating need for software-controlled delays or external bus transceivers. |
Use Scenario: Driving 12-bit parallel outputs from a programmable logic controller (PLC) CPU to isolated relay driver cards. IC Role / Device Role / Timing Role: Line driver buffers digital control signals while providing voltage-level compatibility between 3.3 V FPGA and 5 V relay logic. Use Value: TTL input thresholds ensure reliable signal capture from 3.3 V logic; ±6 mA drive sustains signal integrity over 15 cm PCB traces. |
| Legacy Peripheral Interface | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing a vintage Z80-based single-board computer to modern USB-to-parallel adapters via a buffered handshake bus. IC Role / Device Role / Timing Role: Buffer isolates Z80 address/data bus from adapter's EPP logic, with OE synchronized to /IORQ and /MREQ strobes. Use Value: 15 ns typical propagation delay preserves Z80 timing margins; SO14 package allows drop-in replacement of obsolete 74LS125 variants. |
Use Scenario: Conditioning digital trigger and clock signals in automated test equipment (ATE) before routing to DUT interface connectors. IC Role / Device Role / Timing Role: Provides clean, slew-controlled outputs with matched rise/fall times (5–12 ns) to reduce jitter on timing-critical paths. Use Value: Low transition time variation (Δtt < 3 ns) and 24 pF CPD minimize dynamic power and crosstalk in dense signal routing layers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HCT125D,118 | Same die, identical electrical specs, but in SO14 package without "B" suffix - no functional difference. | No difference; both rated for −40 °C to +125 °C and share identical pinout and timing. | Select based on inventory availability; 74HCT125D,118 is functionally interchangeable with no design change required. |
| SN74HCT125DR | TI part with same logic function, but VIH/VIL thresholds differ slightly (VIH = 2.0 V min vs. 2.0 V typ); propagation delay 19 ns (typ) at 5 V. | Marginally slower enable timing (tPZH = 45 ns max) and lower ESD rating (HBM = 2000 V vs. Nexperia's >2000 V). | Use only if TI supply chain alignment is required; verify tPZH/tPZL timing against bus turnaround budget. |
Compared with 74HCT125DB,118, the 74HCT125D,118 offers identical performance and drop-in compatibility, while SN74HCT125DR introduces minor timing and ESD trade-offs requiring validation in high-reliability or fast-turnaround bus systems.
Availability
74HCT125DB,118 is available at Aetrix Electronics and suitable for microcontroller bus isolation, industrial I/O expansion, legacy peripheral interface, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for 74HCT125DB,118 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.
The 74HCT125 series belongs to Nexperia's industry-standard logic portfolio, designed specifically for robust, pin-compatible replacements of legacy TTL and CMOS buffers in space-constrained, thermally demanding applications.
FAQ
What is the maximum recommended supply voltage for continuous operation?
The absolute maximum supply voltage is +7 V, but continuous operation must remain within the recommended range of 4.5 V to 5.5 V. Exceeding 5.5 V risks violating input/output voltage limits and may cause latch-up per JESD78 Class II Level B testing.
Can 74HCT125DB,118 safely interface with 3.3 V microcontrollers?
Yes - its TTL-compatible inputs accept VIH ≥ 2.0 V and VIL ≤ 0.8 V, making it compatible with 3.3 V logic outputs. However, outputs swing rail-to-rail (0 V to VCC), so a 5 V supply requires level-shifting if driving 3.3 V inputs.
Does this device require external pull-up resistors on OE pins?
No - OE pins are active-low CMOS inputs with leakage current ≤ ±1.0 μA. They can be driven directly by MCU GPIOs or open-collector logic; pull-ups are unnecessary unless implementing hardware reset hold-off or fail-safe default disable.
How does thermal derating affect power dissipation in SO14 package?
For the SOT108-1 (SO14) package, total power dissipation derates linearly at 10.1 mW/K above +100 °C. At +125 °C ambient, Ptot is reduced from 500 mW to 474.75 mW - critical for sustained operation in enclosed enclosures without forced airflow.
74HCT125DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SSOP
74HCT125DB,118 FAQ
1.How can I place an order for 74HCT125DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT125DB,118 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 74HCT125DB,118 reliable?
The price and inventory of 74HCT125DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT125DB,118 is usually 5 days.
3.What payment methods are accepted for 74HCT125DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT125DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT125DB,118?
74HCT125DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT125DB,118 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 74HCT125DB,118?
For technical support, including 74HCT125DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT125DB,118 requirements.
6.How does Aetrix verify that 74HCT125DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HCT125DB,118 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 74HCT125DB,118 meets industry standards.
7.What is the process for return or replacement of 74HCT125DB,118?
All 74HCT125DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT125DB,118, 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 74HCT125DB,118 part is unused and in its original packaging.
Return procedure for 74HCT125DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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