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Texas Instruments SN74HC125DRG4
- Part No.:
- SN74HC125DRG4
- Manufacturer:
- Texas Instruments
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74HC125DRG4.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,843
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Product details
Overview
SN74HC125DRG4 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 digital signal paths in bus isolation and data routing applications.
For engineers reviewing the SN74HC125DRG4 datasheet, SN74HC125DRG4 pinout, SN74HC125DRG4 application, or SN74HC125DRG4 equivalent, this page delivers verified functional identity, SOIC-14 package mapping, 3-state timing behavior, thermal limits, and validated alternative options - all grounded in TI's SCLS104F production datasheet.
Technical Context
This device integrates four independent CMOS buffers, each with active-low 3-state output control (OE), enabling precise bus contention management. Its balanced output structure supports symmetrical sourcing/sinking up to ±35 mA per channel while maintaining rail-to-rail VOH/VOL performance across voltage and temperature ranges.
All inputs are standard CMOS with ≤10 pF input capacitance and ±1 µA leakage at 6 V; outputs enter high-impedance state when OE is HIGH, exhibiting ≤±0.5 µA three-state leakage (IOZ) and supporting fanout of up to 10 LSTTL loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables interoperability with 3.3 V and 5 V logic families without level shifters. |
| Propagation Delay (tpd) | 11 ns max at VCC = 6 V, CL = 50 pF - ensures sub-100 MHz bus operation with timing margin. |
| Output Drive | ±35 mA per channel - sufficient to drive moderate capacitive loads and multiple CMOS inputs directly. |
| 3-State Leakage (IOZ) | ±0.5 µA max at 6 V - guarantees minimal bus leakage during disable, critical for low-power hold states. |
| Input Capacitance (Ci) | 10 pF max - reduces switching noise and simplifies PCB trace design for high-speed routing. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and automotive body electronics. |
| ESD Rating (HBM) | ±2000 V - meets IEC 61000-4-2 Level 2 for robust handling in manufacturing and field environments. |
Pinout & Package
SN74HC125DRG4 is housed in a 14-pin SOIC (D) package measuring 8.70 mm × 3.90 mm, with gull-wing leads, RoHS-compliant NiPdAu/Sn lead finish, and MSL Level-1 rating for unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Channel OE (active-low) | Independent enable control per buffer; HIGH disables output, placing it in high-Z state. |
| 2, 5, 9, 12 | Channel A (input) | CMOS-compatible digital input; must be terminated to VCC or GND if unused. |
| 3, 6, 8, 11 | Channel Y (output) | 3-state buffered output; replicates A when OE = LOW; high-impedance when OE = HIGH. |
| 7 | GND | Reference ground for all logic and power domains; requires low-inductance connection to plane. |
| 14 | VCC | Positive supply rail; requires local 0.1 µF ceramic decoupling capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Quadruple 3-state architecture | Four independent buffers allow selective enable/disable of parallel data lines without shared control logic. |
| Wide supply range (2–6 V) | Eliminates need for separate voltage translators when interfacing mixed-voltage subsystems (e.g., 3.3 V MCU to 5 V peripheral). |
| Balanced CMOS outputs | Symmetrical drive strength ensures consistent rise/fall times and minimizes ground bounce in multi-channel switching. |
| Low ICC (80 µA max) | Reduces static power consumption by >90% versus legacy LSTTL equivalents, extending battery life in portable designs. |
| Standard CMOS inputs | No Schmitt-trigger hysteresis - requires clean, fast-edge signals (<400 ns transition time at 6 V) to prevent shoot-through current. |
Applications
| Bus Isolation | Data Routing |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from shared I²C or SPI buses during firmware updates or sleep modes. IC Role / Device Role / Timing Role: SN74HC125DRG4 acts as a bidirectional bus gate, enabling/disabling signal flow via independent OE pins synchronized to system state machine. Use Value: Prevents bus contention and phantom writes during reconfiguration, leveraging <11 ns tpd and <31 ns tdis to meet tight timing windows. |
Use Scenario: Steering sensor data from multiple ADCs to a single processing unit using time-multiplexed channel selection. IC Role / Device Role / Timing Role: SN74HC125DRG4 serves as a 4-channel digital multiplexer substitute, where each buffer routes one sensor's output under discrete OE control. Use Value: Achieves deterministic latency (≤31 ns max propagation) and eliminates analog switch distortion or on-resistance variation. |
| Level Translation | Signal Conditioning |
Use Scenario: Interfacing a 3.3 V FPGA I/O bank to legacy 5 V peripherals without dedicated level shifters. IC Role / Device Role / Timing Role: SN74HC125DRG4 functions as a unidirectional voltage-tolerant buffer, accepting 3.3 V logic inputs and driving 5 V rails via VCC = 5 V. Use Value: Maintains VIH/VIL compatibility across voltages (e.g., VIH = 3.15 V at 4.5 V VCC) while delivering rail-aligned VOH/VOL. |
Use Scenario: Strengthening weak microcontroller output signals driving long PCB traces or multiple gate inputs. IC Role / Device Role / Timing Role: SN74HC125DRG4 provides current gain and noise immunity, buffering clock or reset signals before distribution. Use Value: Delivers ±35 mA drive capability and <10 pF Ci to reduce edge degradation, supporting trace lengths up to 15 cm at 25 MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC125DR | Identical electrical specs and pinout; differs only in lead finish (NiPdAu/Sn vs. Sn-only) and packaging tape/reel marking. | No functional difference; both qualified for –40°C to +85°C and share same SOIC-14 footprint and thermal metrics. | Select SN74HC125DRG4 for legacy compliance with TI's G4 suffix specification; SN74HC125DR for newer production lots with updated marking. |
| MC74HC125ADTR2G | ON Semiconductor variant with identical logic function, 2–6 V supply, and SOIC-14 package but higher max ICC (100 µA) and slightly looser VOH/VOL tolerances. | Valid for industrial temp range (–40°C to +105°C), offering extended thermal margin over SN74HC125DRG4's +85°C limit. | Choose MC74HC125ADTR2G when operating above +85°C or requiring alternate supply-chain sourcing; verify layout compatibility due to minor package dimension variance (8.75 mm vs. 8.70 mm length). |
Compared with SN74HC125DR and MC74HC125ADTR2G, the SN74HC125DRG4 offers tighter VOH/VOL specs at 4.5 V and lower typical ICC, making it optimal for power-constrained industrial controllers where precision rail alignment and quiescent current matter most.
Availability
SN74HC125DRG4 is available at Aetrix Electronics and suitable for bus isolation, data routing, level translation, and signal conditioning applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant SOIC packaging.
Supply support for SN74HC125DRG4 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 90 years of innovation in high-reliability components.
The SN74HC125DRG4 belongs to TI's 74HC logic family, designed specifically for low-power, high-noise-immunity digital interfacing in industrial automation, test equipment, and communication infrastructure.
FAQ
What is the maximum capacitive load SN74HC125DRG4 can drive while meeting datasheet timing specs?
The SN74HC125DRG4 is characterized for CL ≤ 50 pF in timing specifications (tpd, ten, tdis), with guaranteed performance up to 150 pF at increased delays. For reliable sub-36 ns propagation at 4.5 V, keep total load ≤ 70 pF including trace and input capacitance. Exceeding this requires series termination to limit peak output current per Absolute Maximum Ratings.
Does SN74HC125DRG4 support hot-swap or live-insertion into a powered bus?
No. The SN74HC125DRG4 lacks hot-swap protection circuitry. Its inputs and outputs feature clamp diodes, but applying voltage before VCC stabilization risks exceeding IIK/IOK limits (±20 mA). Always power VCC before asserting signals, and use external series resistors or dedicated hot-swap controllers for live insertion scenarios.
Can unused inputs on SN74HC125DRG4 be left floating?
No. Floating inputs on SN74HC125DRG4 cause undefined logic states, increased ICC, and potential oscillation due to CMOS threshold sensitivity. Unused A or OE pins must be tied to VCC or GND via direct connection or ≤10 kΩ pull-up/down resistor - per TI's SCLS104F Section 9.2.1.2 and Figure 11-1 layout guidance.
What is the thermal resistance (RθJA) of SN74HC125DRG4 in its SOIC-14 package?
The SN74HC125DRG4 in SOIC-14 (D) package has RθJA = 133.6°C/W, measured per JEDEC JESD51-2 with 1-inch² copper pad. This value assumes standard 2-layer board construction; actual junction temperature rise depends on PCB copper area, airflow, and adjacent heat sources - always verify TJ ≤ 150°C under worst-case ICC and IO conditions.
Is SN74HC125DRG4 pin-compatible with older 74LS125 devices?
No. While functionally similar, SN74HC125DRG4 uses CMOS technology with different DC characteristics: VIH/VIL thresholds scale with VCC (e.g., VIH = 3.15 V at 4.5 V), unlike fixed TTL thresholds. Also, output drive strength and timing differ significantly - direct replacement requires validation of VOH/VOL margins, fanout, and propagation delay in the target system.
SN74HC125DRG4 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:
- Discontinued at Digi-Key
- 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
SN74HC125DRG4 FAQ
1.How can I place an order for SN74HC125DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC125DRG4 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 SN74HC125DRG4 reliable?
The price and inventory of SN74HC125DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC125DRG4 is usually 5 days.
3.What payment methods are accepted for SN74HC125DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC125DRG4 transactions.
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4.How is shipping managed for SN74HC125DRG4?
SN74HC125DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC125DRG4 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 SN74HC125DRG4?
For technical support, including SN74HC125DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC125DRG4 requirements.
6.How does Aetrix verify that SN74HC125DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74HC125DRG4 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 SN74HC125DRG4 meets industry standards.
7.What is the process for return or replacement of SN74HC125DRG4?
All SN74HC125DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC125DRG4, 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 SN74HC125DRG4 part is unused and in its original packaging.
Return procedure for SN74HC125DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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