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Texas Instruments SN74AHCT125DGVR
- Part No.:
- SN74AHCT125DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT125DGVR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
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Product details
Overview
SN74AHCT125DGVR from Texas Instruments is a quadruple 3-state bus buffer gate IC with independent output-enable control per channel, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA drive strength, 5 V supply operation, and TVSOP-14 package - used for digital signal isolation, LED control, and switch debouncing in industrial control and embedded interface circuits.
For engineers reviewing the SN74AHCT125DGVR datasheet, SN74AHCT125DGVR pinout, SN74AHCT125DGVR application, or SN74AHCT125DGVR equivalent, key selection criteria include 3-state output timing (tPLH/tPHL ≤ 6.5 ns @ 15 pF), input voltage compatibility with legacy TTL logic, thermal performance (θJA = 127 °C/W), and TVSOP-14 footprint constraints for high-density PCB layouts.
Technical Context
The SN74AHCT125DGVR implements four independent CMOS buffer gates, each with dedicated active-low output-enable (OE) control. Each gate passes A→Y when OE is low; outputs enter high-impedance state when OE is high - enabling bidirectional bus sharing and signal gating without contention.
It operates strictly within 4.5 V to 5.5 V supply range, supports TTL-level inputs (2 V VIH min, 0.8 V VIL max), delivers VOH ≥ 3.8 V and VOL ≤ 0.44 V at ±8 mA loads, and exhibits 14 pF power dissipation capacitance - confirming its role as a low-power, noise-immune interface buffer for mixed-voltage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic rails and tolerance against supply ripple. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2 V, VIL ≤ 0.8 V) - allows direct interfacing with legacy 5 V TTL outputs without level-shifting. |
| Output Drive | ±8 mA - sufficient to drive LEDs, small capacitive loads (<50 pF), and multiple CMOS inputs without external buffers. |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - enables reliable operation in 100+ MHz data paths with tight timing margins. |
| 3-State Enable Time | tPZH/tPZL ≤ 6 ns @ CL = 15 pF - guarantees fast bus release for time-critical arbitration and multiplexing. |
| Power Dissipation | Cpd = 14 pF - predicts low dynamic power consumption (~0.35 mW/MHz at 5 V), critical for thermally constrained designs. |
| Operating Temperature | –40 °C to +85 °C - qualified for commercial industrial environments including factory automation and instrumentation. |
Pinout & Package
SN74AHCT125DGVR uses a 14-pin Thin Very Small Outline Package (TVSOP) with 0.5 mm pitch, 3.6 mm × 4.9 mm body size, and exposed pad for thermal enhancement. Pin numbering follows standard DGV package top-view orientation (pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE1–OE4 (active-low) | Independent 3-state enable inputs - tie together for synchronous gating or drive separately for dynamic channel selection. |
| 2, 5, 9, 12 | A1–A4 | Buffer input terminals - accept TTL/CMOS logic signals; require termination if unused (VCC or GND). |
| 3, 6, 8, 11 | Y1–Y4 | Buffer output terminals - present high-impedance state when corresponding OE is high; otherwise replicate A input. |
| 7 | GND | Ground reference - must be low-impedance connection; shared return path for all four channels. |
| 14 | VCC | Positive supply - requires local 0.1 µF bypass capacitor placed adjacent to pin for stable switching operation. |
Key Features
| Feature | Design Value |
|---|---|
| Individual 3-state control per channel | Enables selective bus isolation - e.g., disable only one data line while others remain active, preventing contention on shared buses. |
| TTL-compatible input thresholds | Eliminates need for external level shifters when interfacing with legacy 5 V TTL microcontrollers or peripheral ICs. |
| Latch-up immunity >250 mA | Ensures robustness against transient current surges during hot-plug or ESD events in industrial I/O modules. |
| Low input leakage (±1 µA) | Permits high-impedance pull-up/pull-down resistor networks (e.g., 10 kΩ) without compromising logic levels or power budget. |
| Fast 3-state transition (≤6 ns) | Supports high-speed bus arbitration protocols where rapid output disable is required to avoid data corruption. |
Applications
| Industrial Digital I/O Expansion | Microcontroller GPIO Multiplexing |
|---|---|
Use Scenario: Adding isolated digital input/output lines to PLC backplanes or sensor interface modules using limited MCU pins. IC Role / Device Role / Timing Role: Bus buffer providing direction-controlled signal pass-through and 3-state isolation between field-side and controller-side logic domains. Use Value: Enables reuse of single MCU port for multiple functions (e.g., UART TX/RX, SPI CS, GPIO) via OE-driven channel selection - reducing BOM count and PCB layer count. |
Use Scenario: Routing alternate peripheral signals (e.g., UART vs. I²C) through shared physical pins on resource-constrained MCUs like MSP430 or STM32G0. IC Role / Device Role / Timing Role: Signal gate that enables/disables data paths based on firmware-configured OE states - acting as hardware-level mux without timing skew. Use Value: Eliminates software-based pin remapping delays and avoids conflicts during mode transitions - improving real-time response in motor control or sensor fusion applications. |
| LED Driver Interface | Switch Debounce Circuit |
Use Scenario: Driving status indicator LEDs directly from logic-level MCU outputs without overloading GPIO current limits. IC Role / Device Role / Timing Role: Current-boosting buffer with 3-state capability - allowing LED on/off control via OE while preserving MCU pin for other functions. Use Value: Delivers up to 8 mA sink/source per LED channel with defined VOL/VOH, ensuring consistent brightness across varying supply voltages and temperature ranges. |
Use Scenario: Cleaning mechanical switch bounce in panel-mounted controls, emergency stop circuits, or rotary encoder interfaces. IC Role / Device Role / Timing Role: Input conditioner that filters slow/noisy transitions by enforcing clean logic thresholds and rejecting sub-20 ns/V slew-rate inputs. Use Value: Reduces firmware debounce overhead and eliminates false triggers in safety-critical applications - verified by JESD17 latch-up rating >250 mA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125DR | Same logic function and electrical specs, but SOIC-14 package (3.9 mm × 4.9 mm, 1.27 mm pitch) - larger footprint and higher θJA (124.5 °C/W). | Better suited for prototyping, manual soldering, or legacy board rework where TVSOP reflow capability is unavailable. | Select SN74AHCT125DR when board assembly lacks fine-pitch reflow capability or thermal margin exceeds 124.5 °C/W requirement. |
| SN74LVC125APWR | Lower VCC range (1.65–3.6 V), higher speed (tPD ≤ 3.7 ns), but not TTL-compatible - VIH min = 2 V only at VCC = 3.3 V; incompatible with 5 V TTL inputs. | Applicable only in 3.3 V-only systems; requires level translation if interfacing with 5 V peripherals. | Choose SN74LVC125APWR only in fully 3.3 V domains where speed outweighs voltage compatibility - not a drop-in replacement for SN74AHCT125DGVR. |
Compared with SN74AHCT125DR and SN74LVC125APWR, the SN74AHCT125DGVR uniquely balances 5 V TTL interoperability, compact TVSOP packaging, and industrial temperature support - making it optimal for space-constrained, mixed-signal industrial controllers requiring legacy interface compatibility.
Availability
SN74AHCT125DGVR is available at Aetrix Electronics and suitable for industrial digital I/O expansion, microcontroller GPIO multiplexing, LED driver interface, and switch debounce circuits requiring stable component supply and long-term production continuity.
Supply support for SN74AHCT125DGVR 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 experience in industrial, automotive, and communications markets.
The SN74AHCT125DGVR belongs to TI's AHCT logic family - designed specifically for 5 V systems requiring TTL-compatible inputs, robust noise immunity, and reliable 3-state bus interface functionality in harsh operating environments.
FAQ
What is the recommended power supply decoupling for SN74AHCT125DGVR?
TI specifies a 0.1 µF ceramic bypass capacitor placed as close as possible to the VCC pin (pin 14) of the SN74AHCT125DGVR. This minimizes high-frequency supply noise and prevents output instability during fast switching. For systems with significant low-frequency ripple, adding a parallel 1 µF capacitor is acceptable - but placement proximity remains critical for effectiveness.
Can SN74AHCT125DGVR operate with a 3.3 V supply?
No - the SN74AHCT125DGVR is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions. At 3.3 V, VIH and VIL thresholds become undefined, VOH drops below TTL-compatibility requirements, and device behavior is not guaranteed. Use SN74LVC125APWR instead for 3.3 V systems.
How should unused inputs be handled on SN74AHCT125DGVR?
All unused inputs (A1–A4 and OE1–OE4) on the SN74AHCT125DGVR must be tied to either VCC or GND - never left floating. TI recommends 10 kΩ pull-up or pull-down resistors for flexibility. Floating inputs cause increased ICC, oscillation, and potential latch-up due to CMOS input structure sensitivity.
Is SN74AHCT125DGVR pin-compatible with SN74AHCT125DBR?
Yes - both SN74AHCT125DGVR (TVSOP-14) and SN74AHCT125DBR (SSOP-14) share identical pinout, logic function, and electrical specifications. They differ only in package dimensions and thermal metrics (θJA = 127 °C/W vs. 96 °C/W), allowing direct PCB footprint substitution where layout permits.
What is the maximum capacitive load SN74AHCT125DGVR can drive while meeting timing specs?
The SN74AHCT125DGVR meets all published timing specifications (e.g., tPLH ≤ 6.5 ns) with load capacitance ≤ 15 pF. It can drive up to 50 pF while maintaining functional operation, but propagation delay increases linearly - e.g., tPLH rises to ≤ 8.5 ns at 50 pF. Exceeding 50 pF risks timing violations and signal integrity loss.
SN74AHCT125DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TVSOP
SN74AHCT125DGVR FAQ
1.How can I place an order for SN74AHCT125DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT125DGVR 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 SN74AHCT125DGVR reliable?
The price and inventory of SN74AHCT125DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT125DGVR is usually 5 days.
3.What payment methods are accepted for SN74AHCT125DGVR?
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SN74AHCT125DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT125DGVR 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 SN74AHCT125DGVR?
For technical support, including SN74AHCT125DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT125DGVR requirements.
6.How does Aetrix verify that SN74AHCT125DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT125DGVR 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 SN74AHCT125DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHCT125DGVR?
All SN74AHCT125DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT125DGVR, 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 SN74AHCT125DGVR part is unused and in its original packaging.
Return procedure for SN74AHCT125DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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