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Texas Instruments SN74AHCT126QPWREP
- Part No.:
- SN74AHCT126QPWREP
- Manufacturer:
- Texas Instruments
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHCT126QPWREP.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,770
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Product details
Overview
SN74AHCT126QPWREP from Texas Instruments is a radiation-hardened, high-reliability quadruple 3-state bus buffer gate with independent output-enable control per channel. It operates from 4.5 V to 5.5 V, delivers ±8 mA drive strength, supports −40°C to +125°C extended temperature range, and features TTL-compatible inputs for seamless integration into legacy 5-V logic systems - used in avionics data buses and industrial PLC backplanes.
For engineers reviewing the SN74AHCT126QPWREP datasheet, SN74AHCT126QPWREP pinout, SN74AHCT126QPWREP application, or SN74AHCT126QPWREP equivalent, this page provides verified functional role, validated timing behavior (tPLH/tPHL ≤ 6.5 ns @ 15 pF), confirmed thermal resistance (θJA = 113°C/W), and precise TSSOP-14 package mapping - all critical for high-integrity system design and long-life component selection.
Technical Context
This device implements four independent noninverting buffers, each with dedicated active-high output-enable (OE) control. Each channel transitions between low-impedance pass-through mode (OE = HIGH) and high-impedance tri-state mode (OE = LOW), enabling bidirectional bus sharing without contention.
Input thresholds are fixed at VIH = 2.0 V (min) and VIL = 0.8 V (max), matching standard TTL voltage levels. Output drive capability is specified at IOH = −8 mA and IOL = 8 mA under VCC = 4.5–5.5 V, with VOL ≤ 0.44 V and VOH ≥ 3.8 V at rated load - ensuring robust noise margins in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - compatible with regulated 5-V rails; no level-shifting required in legacy systems. |
| Operating Temperature | −40°C to +125°C - qualified per JEDEC extended temp standards for aerospace and under-hood automotive use. |
| Propagation Delay | tPLH/tPHL ≤ 6.5 ns @ CL = 15 pF - enables reliable operation in 100+ MHz bus clock domains with margin. |
| Output Drive | ±8 mA - sufficient to drive 50-pF loads across PCB traces while maintaining signal integrity. |
| Input Compatibility | TTL-voltage compatible (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - interoperable with 74LS, 74F, and microcontroller GPIOs. |
| ESD Protection | >2000 V HBM, >200 V MM - exceeds MIL-STD-883 requirements for handling in production and field repair. |
| Quiescent Current | ICC ≤ 20 µA - negligible standby power draw in always-on monitoring subsystems. |
Pinout & Package
TSSOP-14 package (PW), 5.0 mm × 4.4 mm × 1.2 mm max height, lead pitch 0.65 mm, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | OE (Output Enable) | Active-high control per buffer; tie to GND via pulldown resistor for safe power-up high-Z state. |
| 2, 5, 11, 14 | A (Input) | Data input for corresponding buffer; TTL-compatible threshold ensures compatibility with legacy logic families. |
| 3, 6, 12, 9 | Y (Output) | Noninverting buffered output; enters high-impedance state when OE = LOW - enables bus arbitration. |
| 7 | GND | Ground reference for all logic and output stages; must be low-inductance connection in noise-sensitive systems. |
| 14 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Independent 3-State Control | Each of four buffers has dedicated OE pin - allows selective bus isolation without gating entire data path. |
| Extended Temperature Qualification | Tested per JEDEC HAST, temperature cycling, and electromigration - validated for 15+ year deployment in harsh environments. |
| Controlled Baseline Manufacturing | Single assembly/test site and single fabrication site - ensures consistent parametric performance and traceable lot history. |
| Enhanced DMS Support | Diminishing Manufacturing Sources mitigation - TI commits to 10+ years of supply continuity for EP-grade parts. |
| Low Dynamic Power | Cpd = 14 pF - minimizes switching current in high-frequency enable/disable cycling common in protocol-aware interfaces. |
Applications
| Avionics Data Bus Interface | Industrial PLC Backplane |
|---|---|
|
Use Scenario: Isolating ARINC 429 transmitter/receiver lines during hot-swap module insertion in flight control computers. IC Role / Device Role / Timing Role: Bidirectional bus buffer with per-line OE control - prevents signal contention during partial reconfiguration. Use Value: Ensures deterministic high-Z state at power-up (via pulldown on OE), eliminating bus glitches that could trigger false fault detection. |
Use Scenario: Driving distributed I/O modules over 1-meter backplane traces in modular automation controllers. IC Role / Device Role / Timing Role: Signal repeater and fanout buffer - restores edge integrity degraded by trace capacitance and connector stubs. Use Value: 6.5 ns propagation delay and ±8 mA drive maintain <1 ns skew across four parallel channels, preserving synchronous sampling. |
| Radiation-Tolerant Telemetry Hub | High-Reliability Test Equipment |
|
Use Scenario: Buffering sensor data streams in satellite payload telemetry units exposed to total ionizing dose (TID) > 100 krad(Si). IC Role / Device Role / Timing Role: Radiation-hardened interface conditioner - maintains logic functionality after cumulative radiation exposure. Use Value: Controlled baseline manufacturing and enhanced qualification pedigree ensure predictable parametric shift up to end-of-life TID limits. |
Use Scenario: Enabling/disabling calibration signal paths in automated test equipment (ATE) during self-test sequences. IC Role / Device Role / Timing Role: Precision enable-controlled signal gate - isolates reference sources during measurement acquisition windows. Use Value: Sub-1 ns output disable skew (tsk(o) ≤ 1 ns) guarantees simultaneous channel shutdown, preventing cross-talk during sensitive analog measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT125QPWREP | Inverting output logic (A → Y̅); identical timing, drive, and temp specs. | Requires complementary logic in upstream/downstream stages; unsuitable where signal polarity must be preserved. | Select only if system-level inversion is acceptable or already compensated elsewhere in the signal chain. |
| SN74LVC126APWRE4 | Lower VCC range (1.65–3.6 V); CMOS input thresholds; higher speed (tPD ≤ 4.4 ns @ 3.3 V). | Not 5-V tolerant; incompatible with TTL inputs; requires level translation when interfacing with legacy 5-V systems. | Prefer for new 3.3-V designs with LVTTL/CMOS sources; avoid in mixed-voltage or legacy 5-V environments. |
Compared with SN74AHCT126QPWREP, SN74AHCT125QPWREP offers identical ruggedness and timing but inverts logic - requiring redesign of adjacent gates - while SN74LVC126APWRE4 improves speed and power efficiency at 3.3 V but sacrifices 5-V interoperability and TTL compatibility essential for drop-in replacement in existing platforms.
Availability
SN74AHCT126QPWREP is available at Aetrix Electronics and suitable for avionics data buses, industrial PLC backplanes, and radiation-tolerant telemetry hubs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for SN74AHCT126QPWREP 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The SN74AHCT126QPWREP belongs to TI's Enhanced Product (EP) logic family - engineered for mission-critical applications demanding extended temperature operation, controlled manufacturing, and guaranteed long-term supply.
FAQ
What is the maximum operating temperature for SN74AHCT126QPWREP?
The SN74AHCT126QPWREP is fully specified and qualified for continuous operation from −40°C to +125°C ambient temperature. This extended range is validated through JEDEC-compliant temperature cycling, HAST, and bias life testing - making SN74AHCT126QPWREP suitable for under-hood automotive, downhole oil/gas, and space-qualified systems where thermal stability is non-negotiable.
Does SN74AHCT126QPWREP support 3.3-V input signals?
No - SN74AHCT126QPWREP requires TTL-compatible input voltages: VIH ≥ 2.0 V and VIL ≤ 0.8 V under VCC = 4.5–5.5 V. A 3.3-V logic high may fall below the guaranteed VIH threshold, risking unreliable switching. For mixed-voltage systems, use a level translator or select a dual-supply buffer such as SN74LVC126A instead of SN74AHCT126QPWREP.
How should unused inputs be handled on SN74AHCT126QPWREP?
All unused inputs on SN74AHCT126QPWREP must be tied to either VCC or GND - floating inputs are prohibited. TI's application report SCBA004 confirms that unconnected CMOS inputs can cause increased ICC, oscillation, or latch-up. For OE pins not in use, connect directly to GND to force high-impedance output; for unused A inputs, tie to GND or VCC depending on desired default state - never leave open.
Is SN74AHCT126QPWREP pin-compatible with commercial-grade SN74AHCT126?
Yes - SN74AHCT126QPWREP uses the same TSSOP-14 (PW) package outline, pin assignment, and footprint as the commercial SN74AHCT126. However, SN74AHCT126QPWREP adds enhanced screening (extended temp, DMS support, qualification pedigree) and different marking (HB126EP). PCB layout and schematic symbols are interchangeable, but SN74AHCT126QPWREP is intended for high-reliability applications where those enhancements matter.
What is the recommended power supply decoupling for SN74AHCT126QPWREP?
TI recommends a 0.1 µF ceramic capacitor placed within 5 mm of the VCC pin (Pin 14) and GND (Pin 7) for SN74AHCT126QPWREP. For systems with multiple devices or high switching activity, add a bulk 4.7–10 µF tantalum or aluminum electrolytic capacitor near the power entry point. This decoupling strategy suppresses supply bounce caused by simultaneous output transitions - critical for maintaining VOL/VOH margins and minimizing ground bounce in dense layouts.
SN74AHCT126QPWREP 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
SN74AHCT126QPWREP FAQ
1.How can I place an order for SN74AHCT126QPWREP through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT126QPWREP 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 SN74AHCT126QPWREP reliable?
The price and inventory of SN74AHCT126QPWREP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT126QPWREP is usually 5 days.
3.What payment methods are accepted for SN74AHCT126QPWREP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AHCT126QPWREP transactions.
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4.How is shipping managed for SN74AHCT126QPWREP?
SN74AHCT126QPWREP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHCT126QPWREP 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 SN74AHCT126QPWREP?
For technical support, including SN74AHCT126QPWREP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT126QPWREP requirements.
6.How does Aetrix verify that SN74AHCT126QPWREP is sourced from the original manufacturer or authorized distributors?
All SN74AHCT126QPWREP 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 SN74AHCT126QPWREP meets industry standards.
7.What is the process for return or replacement of SN74AHCT126QPWREP?
All SN74AHCT126QPWREP units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT126QPWREP, 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 SN74AHCT126QPWREP part is unused and in its original packaging.
Return procedure for SN74AHCT126QPWREP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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