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Texas Instruments SN74AHCT1G126DBVT
- Part No.:
- SN74AHCT1G126DBVT
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74AHCT1G126DBVT.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
SN74AHCT1G126DBVT from Texas Instruments is a single-channel 3-state bus buffer gate with TTL-compatible inputs, operating at 4.5 V–5.5 V supply, delivering ±8 mA output drive, 6 ns max propagation delay at 5 V, and 10 µA max quiescent current. It serves as a level-translating line driver in 5 V digital bus isolation and enable-controlled signal routing applications.
For engineers reviewing the SN74AHCT1G126DBVT datasheet, SN74AHCT1G126DBVT pinout, SN74AHCT1G126DBVT application, or SN74AHCT1G126DBVT equivalent, key selection criteria include its 3-state output control via OE, SOT-23-5 package footprint, 5.5 V absolute maximum rating, -40°C to +125°C operating range, and compatibility with legacy TTL logic levels.
Technical Context
The SN74AHCT1G126DBVT implements a non-inverting buffer with active-high output-enable (OE) control: when OE is high, A passes to Y; when OE is low, Y enters high-impedance state. Its input thresholds (VIL = 0.8 V, VIH = 2.0 V) support direct interfacing with 3.3 V TTL outputs while operating on 5 V rails.
Designed for bus contention avoidance, it features slow edge rates (20 ns/V input transition rate limit), low drive strength (±8 mA), and latch-up immunity exceeding 250 mA per JESD17 - enabling robust operation in noisy industrial and automotive subsystems without external termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5 V logic systems and tolerance against rail droop. |
| Max Propagation Delay | 6 ns at 5 V, CL = 15 pF - enables use in sub-100 MHz synchronous bus interfaces with timing margin. |
| Output Drive | ±8 mA at 5 V - sufficient for driving multiple CMOS loads but limits trace length/ringing in uncontrolled impedance environments. |
| Quiescent Current | 10 µA max - supports low-power standby states in battery-backed or energy-sensitive subsystems. |
| Input Compatibility | TTL voltage levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - allows direct connection to 3.3 V microcontroller GPIOs without level shifters. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive, industrial motor control, and server motherboard environments. |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for assembly and field service without special ESD controls. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.45 mm max height, gull-wing leads, pin 1 marked by index area. Compatible with standard pick-and-place and reflow processes (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable | Drives Y into high-Z when low; requires pulldown resistor during power-up to prevent bus contention. |
| 2 - A | Buffer input | Accepts TTL-level signals; no internal pullup/pulldown - must be driven or externally biased. |
| 3 - GND | Ground reference | Primary return path for logic and output currents; must be low-inductance connection to system ground plane. |
| 4 - Y | 3-state buffered output | Delivers true (non-inverted) replica of A when OE is high; presents >10⁶ Ω impedance when OE is low. |
| 5 - VCC | Power supply | 5 V nominal supply; requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-input compatibility | Enables direct interface with 3.3 V microcontrollers and FPGAs without external level-shifting circuitry. |
| Controlled edge rates | Reduces output ringing and EMI in unterminated PCB traces, simplifying layout for cost-sensitive designs. |
| High-impedance output state | Allows safe sharing of bidirectional buses (e.g., address/data lines) without risk of contention-induced current overload. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - ensures robustness against transient ground bounce or supply coupling events. |
| Low ICC standby current | Minimizes system-level power budget impact in always-on monitoring circuits and sleep-mode peripherals. |
Applications
| Motor Control Interface | Server Memory Buffering |
|---|---|
Use Scenario: Isolating microcontroller GPIOs from high-noise motor gate drivers in AC induction inverters. IC Role / Device Role / Timing Role: 3-state buffer enabling/disabling PWM signal paths to IGBT gate drivers based on fault status. Use Value: Prevents bus contention during fault shutdown while maintaining TTL-level compatibility with 3.3 V MCU outputs. | Use Scenario: Driving address strobes and control lines between CPU and DDR memory modules on server motherboards. IC Role / Device Role / Timing Role: Signal repeater with controlled slew rate to reduce crosstalk and timing skew across dense memory interconnects. Use Value: Delivers deterministic 6 ns propagation delay and ±8 mA drive to meet JEDEC setup/hold timing margins without added termination. |
| ADAS Sensor Hub | DLP Projection Timing Control |
Use Scenario: Enabling communication between radar SoC and CAN transceiver in advanced driver assistance systems. IC Role / Device Role / Timing Role: Logic-level translator and bus isolator for SPI or parallel sensor data paths operating at 5 V. Use Value: Supports –40°C to +125°C operation and ±2000 V HBM ESD protection required for automotive under-hood placement. | Use Scenario: Routing pixel clock and sync signals in DLP front projection systems with strict jitter and noise requirements. IC Role / Device Role / Timing Role: Low-jitter, low-ringing buffer for high-fidelity video timing signals between FPGA and DMD controller. Use Value: Slow edge rates suppress harmonic content above 100 MHz, reducing radiated emissions that could distort image fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT1G125DBVT | Inverting buffer (A → ¬Y); identical supply, speed, drive, and package. | Requires logic inversion in signal path; unsuitable where polarity must be preserved. | Select only if system design accommodates inverted output; otherwise, SN74AHCT1G126DBVT remains mandatory. |
| SN74LVC1G126DBVT | Lower voltage operation (1.65–5.5 V); 3.3 V optimized; 8 mA drive at 3.3 V; 3.7 ns tPD typical. | Better suited for mixed-voltage 3.3 V domains; not drop-in for 5 V-only systems due to reduced noise margin at 5 V. | Prefer for new 3.3 V designs; avoid in legacy 5 V bus architectures requiring full TTL noise immunity. |
Compared with SN74AHCT1G125DBVT and SN74LVC1G126DBVT, the SN74AHCT1G126DBVT uniquely provides non-inverting 5 V–TTL-compatible buffering with guaranteed 6 ns max delay and 125°C operation - making it the sole choice for automotive and industrial 5 V bus isolation where polarity, noise margin, and temperature range are non-negotiable.
Availability
SN74AHCT1G126DBVT is available at Aetrix Electronics and suitable for motor control interfaces, server motherboard signal routing, ADAS sensor hubs, and DLP projection timing systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHCT1G126DBVT 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 industrial, automotive, and communications markets.
The SN74AHCT1G126DBVT belongs to TI's AHCT logic family - engineered for 5 V TTL-compatible interfacing with enhanced noise immunity, latch-up robustness, and wide-temperature operation in mission-critical industrial and automotive control systems.
FAQ
What is the function of the OE pin on the SN74AHCT1G126DBVT?
The OE (output enable) pin on the SN74AHCT1G126DBVT is an active-high control input that determines the output state: when OE is high, the device passes the A input signal to the Y output; when OE is low, Y enters a high-impedance (Hi-Z) state. This enables bus sharing and prevents contention. The SN74AHCT1G126DBVT datasheet recommends tying OE to GND via a pulldown resistor during power-up to ensure predictable Hi-Z behavior before system initialization.
Does the SN74AHCT1G126DBVT support 3.3 V input signals?
Yes, the SN74AHCT1G126DBVT supports 3.3 V input signals because its input thresholds are TTL-compatible: VIL ≤ 0.8 V (guaranteed low) and VIH ≥ 2.0 V (guaranteed high). A 3.3 V logic high (typically ~3.3 V) exceeds the 2.0 V VIH requirement, and a 3.3 V logic low (~0 V) stays below the 0.8 V VIL limit. This makes the SN74AHCT1G126DBVT suitable for up-translation from 3.3 V controllers to 5 V buses without external level shifters.
What is the maximum output current rating for the SN74AHCT1G126DBVT?
The SN74AHCT1G126DBVT has a continuous output current rating of ±8 mA per output (IOL = 8 mA, IOH = –8 mA) at VCC = 5 V, with absolute maximum ratings of ±25 mA per output and ±50 mA total device current. Exceeding ±8 mA may degrade VOH/VOL performance or increase propagation delay; sustained operation beyond ±25 mA risks permanent damage. These values are specified in the SN74AHCT1G126DBVT electrical characteristics table under recommended operating conditions.
Is the SN74AHCT1G126DBVT pin-compatible with other SOT-23-5 logic devices?
The SN74AHCT1G126DBVT uses the standard SOT-23-5 pinout (OE–A–GND–Y–VCC), matching TI's SN74AHCT1G125DBVT, SN74LVC1G126DBVT, and SN74AHC1G126DBVT. However, pin compatibility does not guarantee functional or timing equivalence: SN74AHCT1G125DBVT is inverting, while SN74LVC1G126DBVT operates down to 1.65 V. Always verify logic function, voltage range, and timing against the SN74AHCT1G126DBVT datasheet before substitution.
What thermal considerations apply to the SN74AHCT1G126DBVT in high-density PCB layouts?
The SN74AHCT1G126DBVT in SOT-23-5 (DBV) package has a junction-to-ambient thermal resistance (RθJA) of 278°C/W. In high-density layouts, thermal performance depends heavily on copper pour area under the exposed pad (if present) and adjacent ground planes. For continuous operation near max ICC (10 µA) and output loading, no heatsinking is needed; however, transient peak currents demand localized 0.1 µF VCC bypassing and separation from heat-generating components. Thermal data for the SN74AHCT1G126DBVT is validated per JEDEC JESD51 standards and published in Section 5.4 of its datasheet.
SN74AHCT1G126DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-23-5
SN74AHCT1G126DBVT FAQ
1.How can I place an order for SN74AHCT1G126DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT1G126DBVT 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 SN74AHCT1G126DBVT reliable?
The price and inventory of SN74AHCT1G126DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT1G126DBVT is usually 5 days.
3.What payment methods are accepted for SN74AHCT1G126DBVT?
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4.How is shipping managed for SN74AHCT1G126DBVT?
SN74AHCT1G126DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT1G126DBVT 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 SN74AHCT1G126DBVT?
For technical support, including SN74AHCT1G126DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT1G126DBVT requirements.
6.How does Aetrix verify that SN74AHCT1G126DBVT is sourced from the original manufacturer or authorized distributors?
All SN74AHCT1G126DBVT 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 SN74AHCT1G126DBVT meets industry standards.
7.What is the process for return or replacement of SN74AHCT1G126DBVT?
All SN74AHCT1G126DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT1G126DBVT, 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 SN74AHCT1G126DBVT part is unused and in its original packaging.
Return procedure for SN74AHCT1G126DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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