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NXP Semiconductors 74HC125DB,118
- Part No.:
- 74HC125DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 14-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC125DB,118.pdf
- Description:
- IC BUFFER DVR TRI-ST QD 14SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,300
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Product details
Overview
74HC125DB,118 from Nexperia is a quad 3-state buffer/line driver IC in SO14 (SOT108-1) package, operating from 2.0 V to 6.0 V supply, with CMOS-level inputs, 17 ns max propagation delay at VCC = 6.0 V, and -40 °C to +125 °C temperature range - used for bus isolation and signal routing in digital logic systems.
For engineers reviewing the 74HC125DB,118 datasheet, 74HC125DB,118 pinout, 74HC125DB,118 application, or 74HC125DB,118 equivalent, key selection criteria include 3-state enable timing (max 32 ns disable time), input clamp diode support for overvoltage-tolerant interfacing, rail-to-rail output swing, and SO14 package compatibility with legacy PCB footprints.
Technical Context
This device implements four independent non-inverting buffers, each with active-low 3-state output enable (nOE). Each channel features input clamp diodes enabling safe interface to signals exceeding VCC when used with current-limiting resistors.
It operates across two logic families: 74HC125 uses CMOS-compatible input thresholds (VIH ≥ 3.15 V at VCC = 4.5 V), while 74HCT125 supports TTL-level inputs (VIH ≥ 2.0 V at VCC = 5 V). Both share identical pinout, package, and 3-state control architecture.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0 V to 6.0 V - supports mixed-voltage system interfacing and battery-powered logic domains. |
| Propagation Delay | 9 ns (typ) to 17 ns (max) at VCC = 6.0 V - enables reliable operation in 25 MHz+ synchronous buses. |
| 3-State Disable Time | 12 ns (typ) to 32 ns (max) - ensures clean bus release before next driver activation in shared-bus architectures. |
| Input Clamp Current | ±20 mA - allows external resistor-limited interfacing to voltages up to VCC + 0.5 V without damage. |
| Output Drive | ±7.8 mA at VCC = 6.0 V - sufficient to drive 50 pF loads with <15 ns transition times and maintain signal integrity. |
| Operating Temperature | -40 °C to +125 °C - qualified for industrial and under-hood automotive auxiliary electronics (non-safety-critical). |
| ESD Protection | HBM >2000 V, CDM >1000 V - reduces risk of handling damage during assembly and field service. |
Pinout & Package
74HC125DB,118 is housed in a plastic small outline package (SO14), SOT108-1, with 14 leads and 3.9 mm body width - compatible with standard SOIC-14 footprints and reflow soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | nOE (active-low output enable) | Independent per-channel control: HIGH forces high-impedance output; LOW enables buffered pass-through. |
| 2, 5, 9, 12 | nA (data input) | CMOS-level input with clamp diodes - accepts overvoltage signals when series-resistor limited. |
| 3, 6, 8, 11 | nY (data output) | Non-inverting buffered output with rail-to-rail swing and ±7.8 mA drive capability. |
| 7 | GND | Reference ground for all I/O and internal circuitry; must be low-impedance connection. |
| 14 | VCC | Primary power supply; decoupling capacitor (100 nF) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V–6.0 V operation enables direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Input clamp diodes | Enables robust interfacing to signals up to VCC + 0.5 V using external current-limiting resistors. |
| High noise immunity | Typical noise margin >1.3 V at VCC = 4.5 V - suppresses false triggering in electrically noisy industrial environments. |
| Latch-up immunity | Exceeds 100 mA per JESD78 Class II Level B - prevents destructive latch-up during transient overvoltage events. |
| Low static current | Max 160 μA at +125 °C - minimizes standby power in always-on embedded controllers and sensor nodes. |
Applications
| Industrial PLC Backplane Bus | Microcontroller GPIO Expansion |
|---|---|
Use Scenario: Isolating multiple microcontrollers on a shared RS-485 or CAN bus backplane where only one node transmits at a time. IC Role / Device Role / Timing Role: Quad 3-state buffer acts as bidirectional bus gate, enabling/disabling signal paths under MCU software control with sub-32 ns disable latency. Use Value: Prevents bus contention by ensuring only one driver is active; clamp diodes tolerate voltage mismatches between mixed-supply nodes. |
Use Scenario: Expanding limited GPIO count of an ARM Cortex-M0+ MCU to drive 16-segment LED displays and keypad scan lines. IC Role / Device Role / Timing Role: Provides level-shifted, current-boosted, and tri-stated outputs for multiplexed display segments and row/column drivers. Use Value: Eliminates need for discrete transistors; SO14 footprint fits dense PCB layouts; 7.8 mA drive sustains LED brightness without external drivers. |
| Legacy System Logic Interface | Test Equipment Signal Routing |
Use Scenario: Interfacing modern 3.3 V FPGA I/O banks to legacy 5 V TTL peripherals in lab instrumentation upgrades. IC Role / Device Role / Timing Role: Acts as unidirectional level translator and bus buffer, with 3-state control synchronized to FPGA configuration state. Use Value: CMOS input thresholds accept 3.3 V logic; 5 V-tolerant outputs drive legacy loads; no external biasing required. |
Use Scenario: Dynamic signal path selection in automated test equipment (ATE) where DUT signals are routed to multiple measurement channels. IC Role / Device Role / Timing Role: Functions as digitally controlled analog switch substitute for digital signals, with enable-controlled channel isolation. Use Value: Sub-20 ns propagation delay preserves signal edge fidelity; 3-state outputs prevent crosstalk between unused paths. |
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 |
|---|---|---|---|
| 74HC125PW,118 | TSSOP14 (SOT402-1) package, 4.4 mm body width, 0.65 mm pitch - smaller footprint but higher thermal resistance (7.3 mW/K derating above 81 °C). | Better suited for space-constrained portable designs; less suitable for high-power-density industrial boards with limited airflow. | Select when PCB area is critical and thermal load remains below 200 mW; verify reflow profile compatibility with TSSOP. |
| SN74LVC125APWR | 3.3 V only (1.65–3.6 V), lower propagation delay (5.5 ns typ), higher drive (±24 mA), but no input clamp diodes or overvoltage tolerance. | Optimized for high-speed 3.3 V-only systems; incompatible with 5 V interfaces or overvoltage scenarios without external protection. | Choose for speed-critical 3.3 V applications where bus voltage matching is guaranteed and overvoltage risk is absent. |
Compared with 74HC125PW,118, the 74HC125DB,118 offers superior thermal performance in high-ambient environments due to SO14's lower junction-to-ambient resistance; versus SN74LVC125APWR, it trades speed for broader voltage flexibility and built-in overvoltage resilience - making it preferred for mixed-supply and ruggedized designs.
Availability
74HC125DB,118 is available at Aetrix Electronics and suitable for industrial PLC backplanes, microcontroller GPIO expansion, legacy system logic interface, and test equipment signal routing requiring stable component supply across extended temperature ranges.
Supply support for 74HC125DB,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 delivering high-performance, reliable logic, analog, and discrete components - founded in 2017 as a spin-off from NXP, now serving industrial, automotive, and consumer markets.
The 74HC/HCT logic family targets robust, cost-effective digital interfacing - designed specifically for bus buffering, level translation, and signal conditioning in noise-prone, thermally demanding, and mixed-voltage embedded systems.
FAQ
Can 74HC125DB,118 operate reliably at 2.0 V supply?
Yes. The device is fully specified down to 2.0 V: propagation delay remains ≤100 ns, VIH minimum is 1.5 V, and output drive sustains ≥4 mA at VOH ≥1.9 V. It meets all AC/DC parameters across the full -40 °C to +125 °C range at this voltage, making it suitable for ultra-low-power battery-backed systems.
What is the maximum capacitive load this IC can drive without signal degradation?
At VCC = 6.0 V, the device drives 50 pF loads with ≤17 ns propagation delay and ≤15 ns transition time (tt), per datasheet Table 7. Driving >100 pF risks exceeding recommended output current limits (±35 mA absolute max), increasing rise/fall times and potential overshoot - use series termination or buffer staging for heavier loads.
Does 74HC125DB,118 support hot-swap or live-insertion into a powered bus?
No. While input clamp diodes allow limited overvoltage tolerance (up to VCC + 0.5 V with current limiting), the device lacks true hot-swap protection such as slew-rate control or undervoltage lockout. Inserting into a live 5 V bus without series resistors may exceed ±20 mA clamp current rating and cause permanent damage.
How does the 74HC125 differ from the 74HCT125 in practical design use?
The 74HC125 accepts CMOS-level inputs (VIH ≥ 70% VCC), while the 74HCT125 accepts TTL-level inputs (VIH ≥ 2.0 V regardless of VCC). In a 5 V system, both work identically; in a 3.3 V system, only the 74HC125 guarantees compatibility with 3.3 V CMOS outputs, whereas the 74HCT125 may misread them as LOW if VCC drops below 4.5 V.
74HC125DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 14-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SSOP
74HC125DB,118 FAQ
1.How can I place an order for 74HC125DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC125DB,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 74HC125DB,118 reliable?
The price and inventory of 74HC125DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC125DB,118 is usually 5 days.
3.What payment methods are accepted for 74HC125DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC125DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC125DB,118?
74HC125DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC125DB,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 74HC125DB,118?
For technical support, including 74HC125DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC125DB,118 requirements.
6.How does Aetrix verify that 74HC125DB,118 is sourced from the original manufacturer or authorized distributors?
All 74HC125DB,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 74HC125DB,118 meets industry standards.
7.What is the process for return or replacement of 74HC125DB,118?
All 74HC125DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC125DB,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 74HC125DB,118 part is unused and in its original packaging.
Return procedure for 74HC125DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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