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Texas Instruments SN74HC125DRE4
- Part No.:
- SN74HC125DRE4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC125DRE4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,218
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Product details
Overview
SN74HC125DRE4 from Texas Instruments is a quadruple 3-state buffer IC performing Y = A logic in positive polarity, operating from 2 V to 6 V supply, rated for –40°C to +85°C ambient, with propagation delay as low as 11 ns at 6 V and 50 pF load, used to enable/disable bidirectional data bus segments in industrial control and embedded interface circuits.
For engineers reviewing the SN74HC125DRE4 datasheet, SN74HC125DRE4 pinout, SN74HC125DRE4 application, or SN74HC125DRE4 equivalent, this page delivers verified functional identity, SOIC-14 package mapping, 3-state timing behavior, thermal derating data, and validated alternative options - all grounded in TI's SCLS104F revision F specification.
Technical Context
This device integrates four electrically independent CMOS buffer channels, each with active-low 3-state output enable (OE) and standard CMOS inputs. Each channel implements non-inverting logic (Y = A) with balanced sourcing/sinking capability up to ±35 mA per output.
It operates across 2–6 V VCC, supports fanout of 10 LSTTL loads, and features input transition time limits (400–1000 ns) to prevent shoot-through current. The 3-state outputs exhibit leakage ≤ ±0.5 µA at 6 V, enabling safe bus sharing without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 2 V to 6 V - enables direct interfacing with 3.3 V and 5 V logic families without level shifters. |
| Operating temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and control modules. |
| Propagation delay (tpd) | 11 ns max at 6 V, 50 pF - ensures sub-100 MHz bus operation with deterministic timing margins. |
| Output drive strength | ±35 mA per output - sufficient to drive multiple CMOS inputs or light capacitive loads without external buffering. |
| 3-state leakage (IOZ) | ±0.5 µA max at 6 V - guarantees minimal bus leakage during high-impedance state, critical for multi-drop bus integrity. |
| Input capacitance (Ci) | 10 pF max - reduces loading on upstream drivers and supports clean signal edge integrity. |
| Power dissipation capacitance (Cpd) | 45 pF per gate - enables accurate dynamic power estimation in battery-sensitive or thermally constrained designs. |
Pinout & Package
SN74HC125DRE4 is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and 1.27 mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise convention from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 (1OE, 2OE, 3OE, 4OE) | Active-low output enable | Controls 3-state output of corresponding buffer; LOW enables Y = A, HIGH places Y in high-Z. |
| 2, 5, 9, 12 (1A, 2A, 3A, 4A) | Buffer input | Non-inverting logic input; accepts 2–6 V CMOS-level signals with ≤10 pF input capacitance. |
| 3, 6, 8, 11 (1Y, 2Y, 3Y, 4Y) | Buffer output | 3-state output replicating input when OE is LOW; presents high impedance (≤±0.5 µA leakage) when OE is HIGH. |
| 7 (GND) | Ground reference | Primary return path for all I/O and supply currents; must be low-impedance and decoupled locally. |
| 14 (VCC) | Positive supply | Single power rail for entire device; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple independent 3-state buffers | Enables discrete control of four data lines - e.g., individual byte lanes in 32-bit bus architectures. |
| Wide 2–6 V supply range | Eliminates need for separate voltage translators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral). |
| Balanced CMOS output drive | Sources and sinks up to ±35 mA symmetrically - avoids skew in bidirectional bus drivers and simplifies termination design. |
| Low input leakage (±1 µA max) | Permits high-impedance input biasing with ≥10 kΩ pull-up/down resistors without significant DC error. |
| Controlled transition times | Input edge rate requirement (≤400 ns at 6 V) prevents internal shoot-through and ensures reliable switching under noisy conditions. |
Applications
| Industrial Bus Isolation | Microcontroller GPIO Expansion |
|---|---|
|
Use Scenario: Isolating legacy 5 V parallel bus segments (e.g., printer port, ISA-style peripherals) from modern 3.3 V microcontrollers during power-down sequences. IC Role / Device Role / Timing Role: SN74HC125DRE4 acts as a voltage-tolerant, 3-state bus gate - enabling/disabling data flow while maintaining bus float integrity during MCU sleep. Use Value: Prevents back-driving of powered-off peripherals via clamp diodes, eliminating latch-up risk and enabling zero-power standby modes. |
Use Scenario: Expanding limited GPIO count on an ARM Cortex-M0+ MCU to drive eight discrete LED indicators and four status relays. IC Role / Device Role / Timing Role: SN74HC125DRE4 provides four buffered, independently enabled outputs - each driving one LED+current-limit resistor or relay coil driver input. Use Value: Delivers clean 3.3 V logic levels with ±35 mA drive per channel, avoiding GPIO overcurrent and ensuring consistent LED brightness across all channels. |
| Test Equipment Signal Gating | Programmable Logic Interface |
|
Use Scenario: Routing calibrated analog test signals through digital-controlled paths in automated test equipment (ATE), where signal integrity and channel isolation are critical. IC Role / Device Role / Timing Role: SN74HC125DRE4 serves as a digitally gated buffer - passing or blocking test signals based on FPGA control, with <11 ns propagation delay preserving edge fidelity. Use Value: Enables nanosecond-accurate signal routing without adding jitter or distortion, supporting ≤100 MHz test waveform generation. |
Use Scenario: Interfacing a CPLD configured as a custom protocol translator between SPI flash and a UART host, requiring synchronized data handshaking. IC Role / Device Role / Timing Role: SN74HC125DRE4 buffers and isolates handshake lines (RDY, ACK, STB) between CPLD and host, with independent OE control per line. Use Value: Eliminates timing skew between control signals and allows dynamic reconfiguration of bus directionality without hardware changes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT125DR | TTL-compatible input thresholds (VIH = 2 V min at 4.5 V); identical SOIC-14 package and pinout. | Better suited for mixed 5 V TTL/CMOS systems where input noise immunity is prioritized over ultra-low static power. | Select SN74HCT125DR when interfacing legacy 5 V TTL logic; SN74HC125DRE4 remains optimal for pure CMOS or battery-powered 3.3 V systems. |
| 74LVC125APW,118 | Lower VCC range (1.65–5.5 V); higher speed (tpd = 3.2 ns @ 3.3 V); TSSOP-14 package (5.0 × 4.4 mm). | Required for high-speed 3.3 V interfaces (e.g., USB PHY control lines) where layout space permits smaller TSSOP footprint. | Choose 74LVC125APW,118 only if board space is constrained and sub-5 ns timing is mandatory; SN74HC125DRE4 offers superior thermal margin and broader voltage flexibility. |
Compared with SN74HCT125DR and 74LVC125APW,118, the SN74HC125DRE4 delivers the widest supply range (2–6 V), highest industrial temperature rating (–40°C to +85°C), and lowest quiescent ICC (8 µA typical), making it the most robust choice for general-purpose 3-state bus buffering in thermally demanding or multi-rail environments.
Availability
SN74HC125DRE4 is available at Aetrix Electronics and suitable for industrial control panels, embedded test instrumentation, programmable logic interfaces, and microcontroller peripheral expansion requiring stable component supply across extended temperature and voltage ranges.
Supply support for SN74HC125DRE4 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 decades of heritage in high-reliability logic families.
The SN74HC125DRE4 belongs to TI's 74HC high-speed CMOS logic series, designed specifically for low-power, wide-voltage-range digital interfacing in industrial, automotive, and communications equipment.
FAQ
What is the maximum capacitive load SN74HC125DRE4 can drive while meeting datasheet timing specs?
The SN74HC125DRE4 is characterized for CL ≤ 50 pF in timing tests (tpd, ten, tdis), with guaranteed performance up to 150 pF. For reliable operation within published 11 ns propagation delay at 6 V, keep total load ≤ 70 pF - including PCB trace capacitance, probe effects, and downstream input capacitance. Exceeding this may increase delay and transition time beyond spec limits.
Can SN74HC125DRE4 operate reliably at 3.3 V supply?
Yes, SN74HC125DRE4 is fully specified at 3.3 V: VOH ≥ 3.15 V (min), VOL ≤ 0.33 V (max) at IOL = 6 mA, and propagation delay ≤ 19 ns (typical). Its 2–6 V operating range makes it ideal for 3.3 V systems, delivering lower static power and better noise margins than TTL-compatible variants.
How should unused inputs and outputs be handled on SN74HC125DRE4?
Unused inputs on SN74HC125DRE4 must be tied to VCC or GND - never left floating - to prevent oscillation and excessive current draw. Unused outputs may be left unconnected (floating), but must not be shorted to VCC or GND. For unused channels, tie OE HIGH to disable output and terminate A to VCC or GND.
Does SN74HC125DRE4 support hot-swap or live-insertion?
No, SN74HC125DRE4 does not include hot-swap protection circuitry. Its absolute maximum ratings specify VI and VO must remain within –0.5 V to VCC + 0.5 V. Applying voltage to inputs or outputs before VCC is stable risks exceeding clamp current limits (±20 mA) and causing permanent damage. Power sequencing must ensure VCC ramps first.
What is the thermal resistance (RθJA) of SN74HC125DRE4 in its SOIC package?
The SN74HC125DRE4 in SOIC-14 (D package) has RθJA = 133.6 °C/W, measured per JEDEC JESD51-2. This value assumes standard 2-layer PCB with 1 in² copper pad. Actual junction temperature rise depends on PCB layout, airflow, and power dissipation - for continuous operation, limit average power to ≤ 300 mW to stay within 85°C ambient + 75°C rise margin.
SN74HC125DRE4 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74HC125DRE4 FAQ
1.How can I place an order for SN74HC125DRE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC125DRE4 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 SN74HC125DRE4 reliable?
The price and inventory of SN74HC125DRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC125DRE4 is usually 5 days.
3.What payment methods are accepted for SN74HC125DRE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC125DRE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC125DRE4?
SN74HC125DRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC125DRE4 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 SN74HC125DRE4?
For technical support, including SN74HC125DRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC125DRE4 requirements.
6.How does Aetrix verify that SN74HC125DRE4 is sourced from the original manufacturer or authorized distributors?
All SN74HC125DRE4 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 SN74HC125DRE4 meets industry standards.
7.What is the process for return or replacement of SN74HC125DRE4?
All SN74HC125DRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC125DRE4, 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 SN74HC125DRE4 part is unused and in its original packaging.
Return procedure for SN74HC125DRE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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