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Texas Instruments SN74AHC1G126DBVT
- Part No.:
- SN74AHC1G126DBVT
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SN74AHC1G126DBVT.pdf
- Description:
- IC BUF NON-INVERT 5.5V SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,003
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Product details
Overview
SN74AHC1G126DBVT from Texas Instruments is a single-channel CMOS bus buffer gate with 3-state output, designed for level-shifting and bus isolation in low-power digital systems. It operates from 2 V to 5.5 V, delivers ±8 mA output drive at 5 V, achieves 6 ns max propagation delay, and supports industrial temperature range (–40°C to +125°C). It is used in TV backplane control, server board management, and patient monitoring I/O expansion.
For engineers reviewing the SN74AHC1G126DBVT datasheet, SN74AHC1G126DBVT pinout, SN74AHC1G126DBVT application, or SN74AHC1G126DBVT equivalent, key selection criteria include 3-state enable timing (tPZH/tPHZ), 5.5-V-tolerant inputs for down-translation, low ICC (≤10 µA), thermal resistance (RθJA = 278 °C/W), and SOT-23-5 package compatibility with high-density PCB layouts.
Technical Context
The SN74AHC1G126DBVT implements a noninverting buffer with active-high output-enable (OE) control. Its true logic path passes A → Y when OE = HIGH; output enters high-impedance state when OE = LOW. Input voltage tolerance up to 5.5 V enables interfacing between higher-voltage logic domains and lower-VCC subsystems without external level shifters.
It uses advanced AHC CMOS process technology to achieve balanced rise/fall times, low dynamic power (Cpd = 14 pF), and robust ESD protection (±1500 V HBM). The device complies with JEDEC JESD17 latch-up immunity (>250 mA), ensuring reliability in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 5.5 V - supports mixed-voltage system integration and battery-backed operation down to 2 V. |
| Max Propagation Delay | 6 ns at VCC = 5 V, CL = 15 pF - ensures timing-critical signal routing in high-speed control buses. |
| Output Drive Strength | ±8 mA at VCC = 5 V - sufficient to drive multiple CMOS loads or short PCB traces without external buffering. |
| Quiescent Supply Current | ≤10 µA - enables ultra-low-power standby modes in portable and energy-sensitive medical devices. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - allows safe interfacing with 5-V logic while operating at 3.3 V or 2.5 V. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive modules, industrial PLCs, and medical diagnostics hardware. |
| ESD Rating (HBM) | ±1500 V - meets IEC 61000-4-2 Level 2 requirements for board-level ESD robustness. |
Pinout & Package
SOT-23-5 (DBV) package: 2.9 mm × 2.8 mm footprint, 1.45 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OE | Active-high output enable input | Drives Y into high-Z when LOW; must be pulled to GND via resistor during power-up to prevent bus contention. |
| 2 - A | Buffer input | True logic input accepting 0–5.5 V; no internal pull-up/down; requires external bias if unused. |
| 3 - GND | Ground reference | Primary return path for logic and output currents; must be connected to low-impedance system ground plane. |
| 4 - Y | 3-state buffered output | Noninverting output with ±8 mA drive; high-Z state isolates downstream circuitry during OE = LOW. |
| 5 - VCC | Power supply | Supplies core logic and output stage; requires local 0.1 µF ceramic bypass capacitor placed ≤2 mm from pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2 V–5.5 V operation enables drop-in use across 2.5 V, 3.3 V, and 5 V logic domains without redesign. |
| 5.5-V-tolerant inputs | Allows direct connection to legacy 5-V microcontrollers or sensors while VCC = 3.3 V, eliminating discrete level shifters. |
| Low dynamic power | 14 pF power dissipation capacitance minimizes switching current, reducing heat generation in thermally constrained enclosures. |
| Controlled edge rates | Δt/Δv = 20 ns/V at 5 V suppresses overshoot/undershoot on unterminated traces, easing signal integrity validation. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during transient overvoltage events in motor-control interfaces. |
Applications
| TV Backplane Control | Server Baseboard Management |
|---|---|
|
Use Scenario: Isolating HDMI CEC or DDC bus lines between main SoC and display panel controller in smart TVs. IC Role / Device Role / Timing Role: Bidirectional bus buffer with 3-state control synchronizing with panel power sequencing. Use Value: Prevents backfeed during panel power-down; 5.5-V-tolerant inputs tolerate legacy 5-V CEC signaling while SoC runs at 3.3 V. |
Use Scenario: Enabling/disabling sensor data lines (temperature, fan tach) between BMC and host CPU on server motherboards. IC Role / Device Role / Timing Role: Single-channel isolation gate controlled by BMC firmware to reduce noise coupling during idle periods. Use Value: Reduces system-wide leakage by >5 µA per channel; 125°C rating supports operation near VRMs and memory stacks. |
| Patient Monitoring I/O Expansion | Industrial Motor Control Interface |
|
Use Scenario: Adding isolated GPIOs for alarm indicators or button inputs in Class II medical devices with strict leakage limits. IC Role / Device Role / Timing Role: Low-ICC buffer enabling safe, galvanically isolated front-panel interface via optocoupler-driven OE control. Use Value: Meets IEC 60601-1 creepage/clearance requirements via 3-state isolation; 10 µA max ICC supports battery backup runtime. |
Use Scenario: Interfacing microcontroller GPIOs to opto-isolated gate drivers in variable-frequency drives. IC Role / Device Role / Timing Role: Signal conditioner translating MCU logic levels to driver enable inputs while suppressing EMI-induced glitches. Use Value: ±1500 V HBM withstands motor-drive noise; slow edge rates minimize radiated emissions in EMC-critical drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC1G126DBVT | Lower VCC range (1.65–5.5 V); 3.3-V optimized; 3.5 ns max tpd at 3.3 V; higher drive (±24 mA). | Better suited for 3.3-V-only systems requiring faster timing or heavier capacitive loads. | Select when speed >6 ns is required and VCC is fixed at 3.3 V; avoid if 2-V operation or 5-V input tolerance is needed. |
| SN74AHC1G125DBVT | Identical specs except inverted OE (active-low); same pinout, package, and electrical characteristics. | Used where system control logic asserts enable signals active-low (e.g., legacy FPGA I/O banks). | Drop-in replacement if OE polarity matches existing schematic; verify OE logic inversion in firmware/drivers. |
Compared with SN74LVC1G126DBVT, the SN74AHC1G126DBVT offers wider voltage flexibility and 5.5-V input tolerance but trades off 2.5 ns in speed; versus SN74AHC1G125DBVT, it differs only in OE polarity-no layout or BOM change needed beyond firmware logic adjustment.
Availability
SN74AHC1G126DBVT is available at Aetrix Electronics and suitable for TV backplane control, server baseboard management, and patient monitoring I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74AHC1G126DBVT 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 reliable, high-performance IC design.
The SN74AHC1G126DBVT belongs to TI's AHC logic family, engineered for low-power, wide-supply-voltage bus interfacing in industrial, medical, and consumer electronics where robustness and voltage translation are critical.
FAQ
What is the maximum operating temperature for SN74AHC1G126DBVT?
The SN74AHC1G126DBVT is rated for continuous operation from –40°C to +125°C ambient temperature. This specification is validated per JEDEC JESD51 thermal testing standards and applies to the DBV (SOT-23-5) package under natural convection conditions with recommended PCB copper area. Derating is not required within this range.
Does SN74AHC1G126DBVT support 5-V input signals when powered at 3.3 V?
Yes, SN74AHC1G126DBVT supports input voltages up to 5.5 V regardless of VCC level. When powered at 3.3 V, its inputs remain fully 5-V tolerant - a key feature enabling seamless down-translation from legacy 5-V peripherals without external level shifters or clamping diodes.
What is the recommended bypass capacitor for SN74AHC1G126DBVT?
A 0.1 µF X7R ceramic capacitor placed ≤2 mm from the VCC pin (Pin 5) and GND (Pin 3) is the minimum recommended bypass. For systems with high-frequency noise or multiple logic devices, paralleling a 1 µF capacitor improves low-frequency decoupling. Avoid tantalum or electrolytic types due to ESR and aging effects.
Can SN74AHC1G126DBVT drive a 50-pF load within timing specifications?
Yes - at VCC = 5 V and TA = 25°C, SN74AHC1G126DBVT guarantees tPLH/tPHL ≤9.5 ns and tPZH/tPHZ ≤11.5 ns into a 50-pF load. These values are specified across –40°C to +125°C, ensuring timing compliance in thermally demanding applications like motor control and medical imaging subsystems.
Is SN74AHC1G126DBVT pin-compatible with SN74AHC1G125DBVT?
Yes - SN74AHC1G126DBVT and SN74AHC1G125DBVT share identical SOT-23-5 (DBV) pinout, package dimensions, and electrical specifications. The only functional difference is OE polarity: SN74AHC1G126DBVT uses active-high OE (Pin 1), while SN74AHC1G125DBVT uses active-low OE. No PCB change is required.
SN74AHC1G126DBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- 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:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SN74AHC1G126DBVT FAQ
1.How can I place an order for SN74AHC1G126DBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC1G126DBVT 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 SN74AHC1G126DBVT reliable?
The price and inventory of SN74AHC1G126DBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC1G126DBVT is usually 5 days.
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SN74AHC1G126DBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC1G126DBVT 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 SN74AHC1G126DBVT?
For technical support, including SN74AHC1G126DBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC1G126DBVT requirements.
6.How does Aetrix verify that SN74AHC1G126DBVT is sourced from the original manufacturer or authorized distributors?
All SN74AHC1G126DBVT 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 SN74AHC1G126DBVT meets industry standards.
7.What is the process for return or replacement of SN74AHC1G126DBVT?
All SN74AHC1G126DBVT units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC1G126DBVT, 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 SN74AHC1G126DBVT part is unused and in its original packaging.
Return procedure for SN74AHC1G126DBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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