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Texas Instruments SN74AHCT126PWR
- Part No.:
- SN74AHCT126PWR
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT126PWR.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:27,220
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Product details
Overview
SN74AHCT126PWR from Texas Instruments is a quadruple bus buffer gate with independent 3-state outputs, designed for bidirectional bus interfacing in 5-V systems. It features TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), ±8 mA output drive, and propagation delays as low as 1 ns at 5 V with 15 pF load - enabling reliable level translation from 3.3-V logic to 5-V buses in PC and server I/O subsystems.
For engineers reviewing the SN74AHCT126PWR datasheet, SN74AHCT126PWR pinout, SN74AHCT126PWR application, or SN74AHCT126PWR equivalent, key selection criteria include its 3-state enable control per channel, latch-up immunity (>250 mA), ESD robustness (2000 V HBM), and compatibility with TSSOP-14 layout constraints in space-constrained embedded designs.
Technical Context
The SN74AHCT126PWR implements four independent noninverting buffers, each with dedicated output-enable (OE) input controlling high-impedance state. Its CMOS design with TTL-voltage thresholds enables seamless up-translation from 3.3-V microcontrollers to 5-V peripheral buses without external biasing.
Each channel operates with rail-to-rail output swing (VOH ≥ 3.8 V, VOL ≤ 0.44 V at IOL = 8 mA), supports 5-V ±0.5 V supply, and maintains stable timing across –40°C to 125°C ambient - verified by switching characteristics tables specifying tPLH/tPHL ≤ 7 ns and tPZH/tPHZ ≤ 8.5 ns under 50-pF loading.
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 droop during transient loads. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - guarantees reliable recognition of TTL-level signals from legacy or mixed-voltage sources. |
| Output Drive | ±8 mA per channel - sufficient to drive standard 5-V CMOS/TTL loads without external buffering, while limiting bus contention current. |
| Propagation Delay | tPLH/tPHL ≤ 7 ns @ 5 V, 50 pF - enables sub-100-MHz bus operation with deterministic timing margins in synchronous interfaces. |
| ESD Rating | 2000 V HBM - meets industrial handling requirements and reduces need for external protection on board-level I/O lines. |
| Operating Temp | –40°C to 125°C - supports deployment in extended-temperature environments including telecom infrastructure and automotive body control modules. |
| Quiescent Current | ICC ≤ 20 µA - minimizes standby power in always-on system management functions. |
Pinout & Package
TSSOP-14 package (PW), 5.0 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, exposed thermal pad not present - compatible with standard surface-mount reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 2A, 3A, 4A | Input | Four independent data inputs accepting TTL/CMOS logic levels; each drives corresponding Y output when OE is asserted. |
| 1OE, 2OE, 3OE, 4OE | Enable Control | Active-high per-channel output-enable; pulling low places associated Y output in high-impedance state for bus sharing. |
| 1Y, 2Y, 3Y, 4Y | Output | Noninverting buffered outputs with 3-state capability; sink/source up to 8 mA while maintaining VOH/VOL specs. |
| VCC (Pin 14) | Power Supply | 5-V primary supply connection; requires local 0.1-µF bypass capacitor placed adjacent to pin for noise suppression. |
| GND (Pin 7) | Ground Reference | Common return path for all I/O and internal circuitry; must be low-impedance connection to system ground plane. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Enables direct interface with legacy 3.3-V or 5-V TTL outputs without level-shifter circuits or pull-up resistors. |
| Independent 3-state control | Four separate OE pins allow granular bus arbitration - e.g., isolating memory address lines while keeping data lines active. |
| Slow-edge optimization | Controlled slew rate reduces output ringing and EMI in high-speed PCB traces, critical for clean signal integrity on dense backplanes. |
| Latch-up immunity | Exceeds 250 mA per JESD17 - prevents destructive latch-up during voltage transients or hot-plug events in modular systems. |
| Overvoltage-tolerant inputs | Accepts VI up to 5.5 V regardless of VCC setting - simplifies mixed-supply board design where inputs may float above local rail. |
Applications
| Server Memory Interfacing | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Buffering address/data lines between 3.3-V ARM-based management controller and 5-V DDR SDRAM subsystem in rack-mounted servers. IC Role / Device Role / Timing Role: Bidirectional bus isolator with per-lane 3-state control, ensuring clean signal transitions and preventing bus contention during memory initialization sequences. Use Value: Eliminates need for discrete level shifters while maintaining <7 ns propagation delay - preserving timing margin for 100-MHz memory clock domains. |
Use Scenario: Isolating field I/O signals (24-V digital inputs) from 5-V logic side in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Input-side buffer with TTL-compatible thresholds, translating sensor switch closures into clean 5-V logic levels for FPGA-based sequencers. Use Value: VIH = 2 V ensures reliable detection of marginal 24-V optocoupler outputs even under degraded supply conditions. |
| Network Switch Control Plane | Wearable Health Device Hub |
|
Use Scenario: Driving configuration registers and status LEDs on multi-port Ethernet switch ASICs using shared 5-V control bus. IC Role / Device Role / Timing Role: Output driver with independent OE per channel, enabling dynamic LED multiplexing and register write sequencing without bus conflicts. Use Value: ±8 mA drive strength directly powers standard 20-mA LEDs - removing external transistor stages and reducing BOM count. |
Use Scenario: Interfacing ultra-low-power 3.3-V biosensor ICs (ECG, SpO₂) with 5-V display controller in compact wearable form factors. IC Role / Device Role / Timing Role: Voltage translator and bus conditioner, suppressing noise coupling from display switching onto sensitive analog sensor paths. Use Value: Low ICC (≤20 µA) and slow-edge behavior minimize interference with sub-µV bio-signal acquisition chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC126APWR | 3.3-V only supply (1.65–3.6 V); lower drive (±24 mA); 1.8-V tolerant inputs. | Requires level-shifting for 5-V bus use; better suited for native 3.3-V systems with higher drive needs. | Select when operating exclusively at 3.3 V and needing stronger output current or lower propagation delay (tPD ≈ 3.5 ns). |
| 74ACT126PW | Higher speed (tPD ≈ 3 ns), same 5-V supply, but no TTL input compatibility (VIH = 3.5 V min). | Cannot interface directly with 3.3-V TTL outputs without external biasing or resistive dividers. | Choose for pure 5-V systems demanding maximum speed and noise immunity, where input source is guaranteed 5-V CMOS. |
Compared with SN74LVC126APWR and 74ACT126PW, the SN74AHCT126PWR uniquely balances 5-V operation, TTL input compatibility, and moderate speed - making it the optimal choice for legacy-to-modern interface bridging without redesigning upstream drivers or adding passive components.
Availability
SN74AHCT126PWR is available at Aetrix Electronics and suitable for server motherboard design, industrial PLC I/O expansion, and network switch control plane development requiring stable component supply and long-term manufacturability.
Supply support for SN74AHCT126PWR 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 connectivity technologies, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT126PWR belongs to TI's legacy 74AHCT logic family, engineered for robust 5-V bus interfacing in mixed-voltage systems - emphasizing reliability, wide temperature operation, and backward compatibility with TTL signaling standards.
FAQ
What is the maximum operating temperature for SN74AHCT126PWR?
The SN74AHCT126PWR is rated for operation from –40°C to 125°C ambient temperature, validated per its Recommended Operating Conditions table. This range supports deployment in harsh environments such as telecom base station chassis and under-hood automotive control units where thermal management is constrained. The SN74AHCT126PWR maintains full electrical specifications across this span without derating.
Does SN74AHCT126PWR support 3.3-V input signals directly?
Yes, the SN74AHCT126PWR accepts 3.3-V logic inputs directly due to its TTL-compatible input thresholds: VIH = 2.0 V (min) and VIL = 0.8 V (max). A 3.3-V CMOS output driving into SN74AHCT126PWR will reliably register as HIGH, eliminating need for external pull-ups or level translators. This behavior is explicitly confirmed in Section 7.3 Feature Description of the datasheet.
Can SN74AHCT126PWR outputs drive LEDs directly?
Yes, each SN74AHCT126PWR output can sink or source up to 8 mA continuously, which is sufficient to drive standard indicator LEDs with appropriate current-limiting resistors. For a typical 2-V forward-voltage red LED at 5 V supply, a 390-Ω resistor yields ~7.7 mA - within spec and avoiding thermal stress. Do not exceed 25 mA per output or 50 mA total device current.
Is SN74AHCT126PWR pin-compatible with other 74-series buffers?
The SN74AHCT126PWR uses standard 14-pin TSSOP (PW) pinout matching industry-wide 74xx126 logic devices, including SN74LS126, SN74F126, and SN74LVC126A. Pin assignments for inputs (1A–4A), outputs (1Y–4Y), enables (1OE–4OE), VCC, and GND are identical - enabling drop-in replacement in existing layouts where voltage and speed requirements align.
What is the recommended bypass capacitor for SN74AHCT126PWR?
Texas Instruments recommends a 0.1-µF ceramic capacitor placed as close as possible to the VCC pin (Pin 14) of the SN74AHCT126PWR, with short, low-inductance traces to GND (Pin 7). This value suppresses high-frequency noise generated during output switching. For boards with multiple logic devices, paralleling with a 1-µF capacitor improves low-frequency decoupling - consistent with guidance in Section 8.3 Power Supply Recommendations.
SN74AHCT126PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 14-TSSOP (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 ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
SN74AHCT126PWR FAQ
1.How can I place an order for SN74AHCT126PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT126PWR 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 SN74AHCT126PWR reliable?
The price and inventory of SN74AHCT126PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT126PWR is usually 5 days.
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SN74AHCT126PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT126PWR 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 SN74AHCT126PWR?
For technical support, including SN74AHCT126PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT126PWR requirements.
6.How does Aetrix verify that SN74AHCT126PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHCT126PWR 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 SN74AHCT126PWR meets industry standards.
7.What is the process for return or replacement of SN74AHCT126PWR?
All SN74AHCT126PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT126PWR, 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 SN74AHCT126PWR part is unused and in its original packaging.
Return procedure for SN74AHCT126PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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