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Diodes Incorporated 74AHCT1G125SE-7
- Part No.:
- 74AHCT1G125SE-7
- Manufacturer:
- Diodes Incorporated
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
74AHCT1G125SE-7.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT353
- Quantity:
- Payment:
- Shipping:
Inventory:26,995
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Product details
Overview
74AHCT1G125SE-7 from Diodes Incorporated is a single non-inverting buffer gate with 3-state output, designed for bus driving and signal isolation in 5V logic systems. It operates from 4.5V to 5.5V, delivers ±8 mA output drive at 5.0V, features Schmitt-trigger inputs for noise immunity, and enters high-impedance state when OE is HIGH - used in PC peripheral interfaces and embedded I/O expansion.
For engineers reviewing the 74AHCT1G125SE-7 datasheet, 74AHCT1G125SE-7 pinout, 74AHCT1G125SE-7 application, or 74AHCT1G125SE-7 equivalent, key selection criteria include 3-state control timing (tEN/tDIS ≤ 7.0 ns @ CL=15pF), input hysteresis (ΔVIN ≈ 0.3 V), and SOT353 package thermal resistance (θJA = 371 °C/W).
Technical Context
This device implements a CMOS-based non-inverting buffer with active-low 3-state enable logic: OE = LOW enables Y = A; OE = HIGH forces Y into high-impedance. Input hysteresis (typ. 0.3 V) ensures robust operation with slow-rising signals common in legacy bus environments.
It complies with AEC-Q100 stress testing for latch-up (>100 mA) and ESD (2 kV HBM, 1 kV CDM), and supports industrial temperature range (–40°C to +125°C) with guaranteed propagation delay (tPD ≤ 7.0 ns @ CL=15pF, VCC=5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - compatible with standard 5V TTL/CMOS logic rails and tolerant of supply ripple. |
| IOH/IOL | ±8 mA @ VCC = 4.5 V - sufficient to drive one 50Ω transmission line or multiple 74-series inputs. |
| tPD (A→Y) | ≤ 7.0 ns @ CL = 15 pF, VCC = 5 V - enables reliable timing in 100+ MHz data strobes and address latching. |
| tEN/tDIS | ≤ 7.0 ns / ≤ 8.5 ns @ CL = 15 pF - ensures clean bus turn-on/turn-off without contention in shared-data-path systems. |
| Ci | 2.0 pF typ. - minimizes capacitive loading on upstream drivers and preserves signal edge integrity. |
| Input Hysteresis | ≈ 0.3 V - rejects noise on slow-switching control lines (e.g., GPIO-driven OE in microcontroller I/O expanders). |
Pinout & Package
SOT353 (5-pin, 1.2 mm × 2.1 mm × 0.95 mm body height) surface-mount package with gull-wing leads, RoHS-compliant lead-free finish, and green molding compound (no Br/Sb).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable (active-low) | Drives Y to high-impedance when HIGH; enables pass-through (Y = A) when LOW - used for bus arbitration. |
| 2 (A) | Data Input | Non-inverting input with Schmitt-trigger threshold - accepts slow or noisy digital signals without oscillation. |
| 3 (GND) | Ground Reference | Return path for all internal logic and output current; requires low-inductance connection to minimize ground bounce. |
| 4 (Y) | 3-State Output | Drives external load when enabled; presents >10 MΩ impedance when disabled - prevents bus contention. |
| 5 (VCC) | Supply Voltage | Power rail for internal logic and output stage; must be decoupled with 100 nF ceramic capacitor near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Schmitt-trigger inputs | Provides 0.3 V hysteresis to reject noise on OE or A lines in electrically noisy industrial I/O environments. |
| ±8 mA output drive | Supports fan-out to ≥10 LSTTL loads or direct interface to 50 Ω transmission lines without external buffers. |
| High-impedance leakage < 10 μA | Ensures negligible current draw during 3-state mode - critical for low-power sleep states in portable devices. |
| ESD protection (2 kV HBM) | Meets IEC 61000-4-2 Level 2 requirements - reduces need for external TVS diodes on board-level I/O traces. |
Applications
| PC Peripheral Interface | Microcontroller I/O Expansion |
|---|---|
Use Scenario: Isolating USB hub control lines from host controller to prevent back-driving during hot-plug events. IC Role / Device Role / Timing Role: 3-state buffer isolating OE-controlled data paths between host and peripheral ICs. Use Value: Prevents bus contention during enumeration; tDIS ≤ 8.5 ns ensures fast disable before new device configuration begins. |
Use Scenario: Extending GPIO count on an ARM Cortex-M0 MCU by adding parallel I/O via shift register or port expander. IC Role / Device Role / Timing Role: Level-shifting and bus-driving buffer between MCU GPIO and external 5V logic peripherals. Use Value: Schmitt-trigger input tolerates slow rise times from RC-filtered GPIO; ±8 mA drive supports LED indicators directly. |
| Legacy Bus Arbitration | Digital Audio Signal Routing |
Use Scenario: Managing shared address/data bus between two microcontrollers in a dual-CPU industrial controller. IC Role / Device Role / Timing Role: Bidirectional bus driver controlled by CPU-select logic to gate access to shared memory space. Use Value: Low tPD (≤7.0 ns) maintains timing margin in 20 MHz bus cycles; high-Z leakage <10 μA avoids signal corruption during idle. |
Use Scenario: Routing SPDIF or I²S clock/data lines between audio codec and FPGA in consumer AV receivers. IC Role / Device Role / Timing Role: Non-inverting repeater with 3-state control to isolate unused audio paths and reduce crosstalk. Use Value: 2 pF input capacitance preserves edge rate of 3.08 MHz SPDIF clock; CMOS input avoids DC bias issues on AC-coupled lines. |
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 |
|---|---|---|---|
| SN74LVC1G125DBVR | Wider VCC range (1.65–5.5 V); lower drive (±24 mA max); no Schmitt input. | Better for mixed-voltage systems (e.g., 3.3V MCU controlling 5V peripherals); less noise-immune on slow OE lines. | Select when voltage translation or ultra-low static current (<0.1 μA) is required over noise immunity. |
| 74AHC1G125SE-7 | Same SOT353 package; higher VCC max (5.5 V); identical pinout; no Schmitt input. | Used where faster switching (tPD ≤ 5.5 ns) is prioritized over input noise rejection. | Choose when interfacing with clean, fast-rising control signals and maximum speed is critical. |
Compared with SN74LVC1G125DBVR and 74AHC1G125SE-7, the 74AHCT1G125SE-7 uniquely combines 5V-only compatibility, Schmitt-trigger inputs, and industrial-grade ESD/latch-up performance - making it optimal for legacy 5V bus systems requiring noise resilience and proven reliability.
Availability
74AHCT1G125SE-7 is available at Aetrix Electronics and suitable for PC peripheral interfaces, microcontroller I/O expansion, legacy bus arbitration, and digital audio signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AHCT1G125SE-7 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and consumer applications.
The 74AHCT logic family targets 5V TTL-compatible systems requiring robust noise immunity and industrial temperature operation - optimized for bus buffering, level translation, and I/O isolation in cost-sensitive embedded designs.
FAQ
Can the 74AHCT1G125SE-7 operate at 3.3V?
No. The device is specified only for 4.5V to 5.5V operation per its Recommended Operating Conditions. At 3.3V, VIH minimum (2.0V) is not met relative to VCC, resulting in unreliable logic recognition and potential metastability. Use SN74LVC1G125DBVR instead for 3.3V systems.
What is the purpose of the Schmitt-trigger input on pin A and OE?
The Schmitt-trigger action provides ~0.3 V hysteresis between rising and falling input thresholds, enabling reliable switching despite slow or noisy signal edges. This eliminates chatter on OE during power-up or in electrically noisy environments like motor-control PCBs or industrial I/O modules.
How does the SOT353 package affect thermal performance?
The SOT353 package has θJA = 371 °C/W (vs. 204 °C/W for SOT25), meaning it heats up significantly faster under load. For continuous ±8 mA output current, junction temperature rise exceeds 20°C even at ambient 25°C - derating or PCB copper pour is recommended for sustained operation above 85°C ambient.
Is the 74AHCT1G125SE-7 pin-compatible with other 74-series single-gate buffers?
Yes - it shares identical SOT353 pinout (OE-A-GND-Y-VCC) with 74AHCT1G00SE-7, 74AHCT1G02SE-7, and 74AHCT1G04SE-7. However, logic function differs: this part is non-inverting buffer with 3-state output, while others implement NAND, NOR, or inverter functions - verify functional equivalence before substitution.
74AHCT1G125SE-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74AHCT
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- 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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-353
74AHCT1G125SE-7 FAQ
1.How can I place an order for 74AHCT1G125SE-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AHCT1G125SE-7 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 74AHCT1G125SE-7 reliable?
The price and inventory of 74AHCT1G125SE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AHCT1G125SE-7 is usually 5 days.
3.What payment methods are accepted for 74AHCT1G125SE-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AHCT1G125SE-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AHCT1G125SE-7?
74AHCT1G125SE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AHCT1G125SE-7 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 74AHCT1G125SE-7?
For technical support, including 74AHCT1G125SE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AHCT1G125SE-7 requirements.
6.How does Aetrix verify that 74AHCT1G125SE-7 is sourced from the original manufacturer or authorized distributors?
All 74AHCT1G125SE-7 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 74AHCT1G125SE-7 meets industry standards.
7.What is the process for return or replacement of 74AHCT1G125SE-7?
All 74AHCT1G125SE-7 units undergo pre-shipment inspection (PSI). If there is an issue with 74AHCT1G125SE-7, 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 74AHCT1G125SE-7 part is unused and in its original packaging.
Return procedure for 74AHCT1G125SE-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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