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Texas Instruments CD74HC125MT
- Part No.:
- CD74HC125MT
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HC125MT.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:739
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Product details
Overview
CD74HC125MT from Texas Instruments is a quadruple non-inverting buffer with 3-state outputs, designed for bus interface and signal routing in digital systems. It operates across 2 V to 6 V supply, supports –55°C to +125°C temperature range, delivers propagation delay as low as 17 ns at 6 V, and enables fanout of up to 10 LSTTL loads - commonly used in industrial control backplanes and test equipment I/O expansion.
For engineers reviewing the CD74HC125MT datasheet, CD74HC125MT pinout, CD74HC125MT application, or CD74HC125MT equivalent, key selection criteria include its 3-state output control logic (active-low OE), CMOS input compatibility, thermal robustness in extended temperature environments, and precise timing behavior under varying capacitive loads (CL = 15 pF or 50 pF).
Technical Context
This device implements four independent positive-logic buffers (Y = A), each with dedicated active-low 3-state enable (OE) inputs. Its balanced CMOS output structure provides symmetrical sourcing/sinking capability up to ±35 mA per output, while standard CMOS inputs exhibit ≤10 pF capacitance and ±0.1 µA leakage at 6 V.
Functional operation relies on strict adherence to input transition time limits (≤400 ns at 6 V) to prevent shoot-through current; disable/enable delays (tdis/ten) match propagation delay (tpd) closely - all specified across full military-grade temperature range (–55°C to +125°C) and supply voltages (2 V–6 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - ensures interoperability with 3.3 V and 5 V logic families without level shifters |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial motor control applications |
| Propagation Delay | 17 ns max at 6 V, CL = 50 pF - enables reliable timing in 20 MHz+ data buses |
| Output Drive | ±35 mA per channel - sufficient to drive multiple CMOS inputs or light PCB traces without external buffering |
| Input Capacitance | 10 pF - minimizes loading on upstream drivers and preserves signal edge integrity |
| Three-State Leakage | ±10 µA max at 6 V - ensures stable high-impedance state during bus arbitration or power-down modes |
| Power Dissipation Cap. | 29 pF per gate - allows accurate dynamic power estimation in battery-sensitive or thermally constrained designs |
Pinout & Package
CD74HC125MT is supplied in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, optimized for surface-mount assembly and thermal performance (RθJA = 133.6°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE, 3OE, 4OE | Active-low output enable | Controls 3-state output Y for respective channel; low = enabled, high = high-Z |
| 1A–4A | Buffer input | Positive-logic input; drives corresponding Y output when OE is low |
| 1Y–4Y | Buffer output | Non-inverting output; enters high-impedance state when OE is high |
| GND (Pin 7) | Ground reference | Common return path for all channels; must be low-inductance connection |
| VCC (Pin 14) | Positive supply | Single rail powering all four buffers; requires local 0.1 µF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 3-state buffer architecture | Enables independent control of four signal paths on shared bus lines without contention |
| Balanced CMOS output stage | Supports equal sourcing/sinking capability (±35 mA), reducing need for external pull-ups/downs |
| Wide voltage and temperature range | Operates reliably from 2 V to 6 V and –55°C to +125°C - eliminates derating in harsh environments |
| Low input leakage | ±1 µA max at –55°C to +125°C - prevents unintended logic transitions in high-impedance states |
| Controlled switching characteristics | Specified tpd, ten, tdis, and tt across full operating range - enables deterministic timing analysis |
Applications
| Industrial Bus Interface | Test Equipment Signal Routing |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from noisy PLC backplane signals during firmware updates. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-channel 3-state control, enabling hot-swap-safe I/O isolation. Use Value: Prevents signal contention during reconfiguration; ±35 mA drive sustains signal integrity over 15 cm PCB traces. | Use Scenario: Multiplexing DUT signals to measurement instruments in automated test fixtures. IC Role / Device Role / Timing Role: Signal gating element with sub-20 ns propagation delay, synchronized via system controller OE lines. Use Value: Enables precise timing alignment between stimulus and capture; 10 pF input capacitance minimizes source loading. |
| Military Data Acquisition | Automotive ECU Diagnostics |
Use Scenario: Conditioning sensor data streams before ADC sampling in ruggedized field units. IC Role / Device Role / Timing Role: Level-shifting and noise-filtering buffer supporting wide supply range (2–6 V) and extreme temperatures. Use Value: Maintains valid logic thresholds across full –55°C to +125°C range; 2 V minimum VCC supports low-power sleep modes. | Use Scenario: Enabling/disabling CAN transceiver control lines during vehicle ignition cycles. IC Role / Device Role / Timing Role: Enable-controlled signal pass-through for diagnostic bus arbitration logic. Use Value: Active-low OE simplifies direct MCU GPIO interfacing; ±2000 V HBM ESD rating withstands automotive handling stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buffer-with-3-state-output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC125N | Same logic function and pinout; PDIP-14 package (19.30 mm × 6.40 mm), higher RθJA (62.7°C/W), rated –40°C to +85°C | Limited to commercial/industrial ambient; unsuitable for extended temperature deployments | Select when cost-sensitive prototyping or legacy through-hole assembly is required |
| CD74HCT125M | TTL-compatible input thresholds (VIH = 2 V min); identical SOIC-14 package and temperature range | Interoperates directly with 5 V TTL outputs without level translation; slightly higher ICC | Choose for mixed 5 V TTL/CMOS systems where input threshold matching is critical |
Compared with SN74HC125N and CD74HCT125M, CD74HC125MT offers superior thermal resilience (–55°C to +125°C) in the compact SOIC-14 footprint, while maintaining full logic compatibility - making it optimal for space-constrained, high-reliability embedded systems requiring guaranteed operation across extreme environmental conditions.
Availability
CD74HC125MT is available at Aetrix Electronics and suitable for industrial bus interface, test equipment signal routing, military data acquisition, and automotive ECU diagnostics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC125MT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 50 years of innovation in high-reliability IC design.
The CD74HC125MT belongs to TI's HC logic family - engineered for low-power, high-noise-immunity digital interfacing in demanding industrial, aerospace, and automotive applications.
FAQ
What is the maximum capacitive load the CD74HC125MT can drive while meeting datasheet timing specifications?
The CD74HC125MT is characterized for CL = 15 pF and CL = 50 pF loads in its switching characteristics table. At 6 V supply, propagation delay remains ≤26 ns for CL = 50 pF. Driving larger capacitive loads is possible but may increase delay and risk overshoot; TI recommends limiting total load to ≤70 pF for optimal performance. The CD74HC125MT datasheet specifies output behavior only up to 50 pF, so design margins should account for trace and receiver capacitance beyond that value.
Does the CD74HC125MT support mixed-voltage operation - for example, 3.3 V inputs with a 5 V supply?
Yes, the CD74HC125MT supports mixed-voltage operation: its CMOS inputs accept VIH ≥ 3.15 V and VIL ≤ 1.35 V at VCC = 4.5 V, making it compatible with 3.3 V logic outputs when powered at 5 V. Input thresholds scale with VCC, ensuring reliable recognition of 3.3 V HIGH/LOW levels. This behavior is explicitly verified in the Recommended Operating Conditions table of the CD74HC125MT datasheet and applies across the full –55°C to +125°C temperature range.
How does the CD74HC125MT behave when an output is disabled (OE high) and the output node is pulled externally to VCC or GND?
When OE is high, the CD74HC125MT output enters high-impedance (Hi-Z) state with leakage current ≤±10 µA at 6 V. If externally pulled to VCC or GND, the output voltage will settle at that rail - no damage occurs, and the device remains functional. However, TI advises against connecting outputs directly to VCC or GND without a series resistor, as transient currents during state transitions could exceed absolute maximum ratings. The CD74HC125MT datasheet confirms this safe Hi-Z behavior in Section 8.3.1.
Is the CD74HC125MT pin-compatible with the CD74HC125M or CD74HC125M96 variants?
Yes, CD74HC125MT is pin-compatible with CD74HC125M and CD74HC125M96 - all use the same SOIC-14 (D) package with identical pinout and mechanical dimensions (8.70 mm × 3.90 mm). The "T" suffix denotes tape-and-reel packaging (2500 pcs/reel), while M96 indicates the same carrier format; electrical and thermal specifications are identical. This compatibility is confirmed in TI's PACKAGE OPTION ADDENDUM and validated across all revision history documents for the CD74HC125MT family.
What decoupling capacitance is recommended for stable CD74HC125MT operation?
Texas Instruments specifies a 0.1 µF ceramic capacitor placed physically adjacent to the CD74HC125MT's VCC and GND pins as mandatory for stable operation. Layout guidelines in the CD74HC125MT datasheet emphasize minimizing loop inductance by mounting the capacitor directly across those pins. For systems with broadband noise, TI recommends paralleling the 0.1 µF cap with a 1 µF capacitor - both must be located within 2 mm of the device. This requirement is derived from power integrity analysis in Section 10 and Figure 11-1 of the CD74HC125MT datasheet.
CD74HC125MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
CD74HC125MT FAQ
1.How can I place an order for CD74HC125MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC125MT 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 CD74HC125MT reliable?
The price and inventory of CD74HC125MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC125MT is usually 5 days.
3.What payment methods are accepted for CD74HC125MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC125MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC125MT?
CD74HC125MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC125MT 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 CD74HC125MT?
For technical support, including CD74HC125MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC125MT requirements.
6.How does Aetrix verify that CD74HC125MT is sourced from the original manufacturer or authorized distributors?
All CD74HC125MT 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 CD74HC125MT meets industry standards.
7.What is the process for return or replacement of CD74HC125MT?
All CD74HC125MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC125MT, 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 CD74HC125MT part is unused and in its original packaging.
Return procedure for CD74HC125MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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