My Inquiry
My Account
Toshiba Semiconductor and Storage 74VHCT126AFT
- Part No.:
- 74VHCT126AFT
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT126AFT.pdf
- Description:
- IC BUF NON-INVERT 5.5V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,125
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
74VHCT126AFT from Toshiba Electronic Devices & Storage Corporation is a quad non-inverting 3-state bus buffer IC with TTL-compatible inputs, designed for bidirectional data bus isolation in 5 V digital systems. It features low propagation delay (3.8 ns typ.), ultra-low quiescent current (4.0 µA max), and AEC-Q100 qualified operation from −40 °C to +125 °C - enabling use in automotive infotainment backplane buffering.
For engineers reviewing the 74VHCT126AFT datasheet, 74VHCT126AFT pinout, 74VHCT126AFT application, or 74VHCT126AFT equivalent, key selection criteria include its active-low 3-state enable (G = L → high-Z), 5.5 V tolerant I/O, balanced tPLH/tPHL timing, and TSSOP14B package compatibility with legacy 74-series footprints.
Technical Context
The 74VHCT126AFT implements four independent non-inverting buffers, each with an active-low 3-state control input (G). Its C2MOS silicon gate process delivers TTL-level input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while operating from 4.5–5.5 V supply. Input and output pins tolerate 0–5.5 V regardless of VCC, supporting hot-swap and level-shifting between 3.3 V and 5 V domains.
Propagation delay is tightly matched (tPLH ≈ tPHL), and output skew is limited to 6.1 ns max at 15 pF load. Power-down protection ensures safe operation during supply sequencing or battery backup scenarios, with no external clamping required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V logic rails and tolerant of ±5% regulation variation. |
| Propagation Delay | 3.8 ns (typ.) at VCC = 5.0 V, CL = 15 pF - enables >100 MHz bus operation with margin. |
| 3-State Enable Polarity | Active-low (G = L → high-impedance output) - simplifies direct connection to open-drain or pull-up controlled buses. |
| I/O Voltage Tolerance | 0–5.5 V on all inputs/outputs - eliminates need for external level shifters when interfacing mixed-voltage subsystems. |
| Quiescent Current | 4.0 µA (max) at TA = 25 °C - supports always-on monitoring circuits without significant standby power penalty. |
| Operating Temperature | −40 to +125 °C - validated per AEC-Q100 Rev. H for under-hood automotive applications. |
| Input Compatibility | TTL-level (VIH ≥ 2.0 V, VIL ≤ 0.8 V) - interoperable with legacy 74LS/74ALS outputs without interface logic. |
Pinout & Package
Package: TSSOP14B - 14-pin thin shrink small outline package (4.4 mm × 5.0 mm, 0.65 mm pitch), lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Data Input (A) | Non-inverting buffer input per channel; accepts TTL- or CMOS-level signals up to 5.5 V. |
| 2, 5, 11, 14 | Data Output (Y) | Buffered non-inverted output; enters high-impedance state when corresponding G = L. |
| 3, 6, 8, 12 | 3-State Control (G) | Active-low enable per channel; G = L forces Y to high-Z; G = H enables pass-through. |
| 7 | GND | Ground reference for all logic and I/O; must be connected to system ground plane. |
| 14 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor (0.1 µF) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Validated for automotive applications per Rev. H - supports qualification-critical designs without additional stress testing. |
| 5.5 V tolerant I/O | Enables safe interfacing with overvoltage sources (e.g., battery backup, hot-plug) without external protection diodes. |
| Balanced propagation delays | tPLH ≈ tPHL minimizes duty cycle distortion in clocked data paths and reduces timing skew across channels. |
| Low dynamic noise | VOLP ≤ 0.8 V (max) limits ground bounce and crosstalk in dense PCB layouts with multiple switching outputs. |
| Pin/function compatible with 74-series | Direct drop-in replacement for 74HCT126/74ACT126 in existing TSSOP14 layouts - no PCB redesign needed. |
Applications
| Automotive Infotainment Backplane | Industrial PLC I/O Expansion |
|---|---|
Use Scenario: Isolating CAN/FlexRay controller data buses from shared display and audio subsystems in head units. IC Role / Device Role / Timing Role: Quad 3-state buffer providing bidirectional bus contention control with active-low enable synchronized to processor GPIO. Use Value: Prevents signal corruption during firmware updates by disabling unused bus segments; 125 °C rating ensures reliability near heat-generating SoCs. | Use Scenario: Expanding digital input/output capacity on modular PLC base units using daisy-chained backplane slots. IC Role / Device Role / Timing Role: Level-translating and isolating 5 V sensor/actuator signals from 3.3 V FPGA control logic. Use Value: 0–5.5 V I/O tolerance eliminates external voltage translators; low ICC supports energy-efficient remote I/O modules. |
| Test Equipment Signal Routing | Medical Diagnostic Data Acquisition |
Use Scenario: Multiplexing multiple DUT (device-under-test) digital stimulus/response lines onto a single high-speed digitizer channel. IC Role / Device Role / Timing Role: Non-inverting bus buffer with precise 3-state timing (tPZL = 5.3 ns typ.) for glitch-free channel switching. Use Value: Sub-6 ns enable/disable times minimize dead time between test vectors; matched tPLH/tPHL ensures deterministic edge alignment. | Use Scenario: Buffering parallel ADC output words from multi-channel ECG/EEG front-ends before transmission to ARM-based processing unit. IC Role / Device Role / Timing Role: High-reliability data path isolator with AEC-Q100-grade robustness and low standby current for battery-powered portable diagnostics. Use Value: 4.0 µA max ICC extends battery life in handheld devices; −40 to +125 °C range accommodates sterilization temperature excursions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74VHCT126AM | Same electrical specs but in SOP14 package (larger footprint, 1.27 mm pitch); no AEC-Q100 qualification. | Suitable for industrial or consumer boards where automotive qualification and space constraints are not required. | Select when cost sensitivity outweighs automotive compliance and board area optimization. |
| SN74HCT126QPWRQ1 | TI's AEC-Q100 Grade 1 (−40 to +125 °C) variant in TSSOP14; identical pinout and logic function; slightly higher ICC (20 µA max). | Drop-in alternative for TI-centric BOMs; same automotive thermal envelope but higher static power. | Choose if sourcing from TI distribution channels or requiring TI-specific PPAP documentation support. |
Compared with 74VHCT126AFT, the 74VHCT126AM lacks automotive qualification and uses a larger SOP package, while SN74HCT126QPWRQ1 matches the TSSOP14 footprint and temperature grade but draws five times more quiescent current - making 74VHCT126AFT optimal for thermally constrained, low-power automotive modules.
Availability
74VHCT126AFT is available at Aetrix Electronics and suitable for automotive infotainment backplanes, industrial PLC I/O expansion, and medical diagnostic data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74VHCT126AFT 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
Toshiba Electronic Devices & Storage Corporation designs high-reliability semiconductor solutions for automotive, industrial, and computing markets, with emphasis on AEC-Q100-qualified logic and power devices.
The 74VHCT series targets high-speed, low-power 5 V logic interfacing - specifically engineered for noise-immune bus buffering in harsh environments where voltage tolerance and thermal stability are critical.
FAQ
What is the 3-state enable polarity of the 74VHCT126AFT?
The 74VHCT126AFT uses active-low 3-state control: when the G input is logic low (≤ 0.8 V), the corresponding Y output enters high-impedance state. This differs from the 74VHCT125AFT (active-high G), and is explicitly confirmed in Toshiba's functional description and truth table for the 74VHCT126AFT. Each of the four channels operates independently with this G = L → high-Z behavior.
Does the 74VHCT126AFT support level shifting between 3.3 V and 5 V systems?
Yes, the 74VHCT126AFT supports bidirectional level shifting: its inputs accept TTL-compatible voltages (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and are 5.5 V tolerant, while outputs swing rail-to-rail (VOH ≥ 4.4 V at VCC = 4.5 V). When powered at 5 V, it safely interfaces with 3.3 V controllers driving its inputs, and drives 5 V loads - confirmed in Toshiba's General section and Absolute Maximum Ratings.
Is the 74VHCT126AFT pin-compatible with standard 74-series buffers?
Yes, the 74VHCT126AFT is pin- and function-compatible with industry-standard 74HCT126, 74ACT126, and 74AHCT126 devices in TSSOP14B packaging. Toshiba explicitly states "Pin and function compatible with the 74 series (ACT/HCT/AHCT etc.) 125/126 type" in its Features section, and the Pin Assignment diagram confirms identical 14-pin mapping.
What is the maximum operating temperature range certified for the 74VHCT126AFT?
The 74VHCT126AFT is rated for −40 °C to +125 °C operation and is AEC-Q100 (Rev. H) qualified, as stated in Toshiba's Features and Operating Ranges sections. This full automotive temperature range is validated across DC and AC characteristics, including propagation delay and leakage current limits up to 125 °C.
Can the 74VHCT126AFT be used in hot-swap or battery-backup applications?
Yes, the 74VHCT126AFT supports hot-swap and battery-backup use cases due to its 0–5.5 V input/output voltage tolerance regardless of VCC, and built-in power-down protection on all pins. Toshiba's General section explicitly cites "battery back up, hot board insertion" as supported scenarios, and Absolute Maximum Ratings confirm VIN/VOUT withstand up to 7.0 V transiently.
74VHCT126AFT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74VHCT
- 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
74VHCT126AFT FAQ
1.How can I place an order for 74VHCT126AFT through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT126AFT 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 74VHCT126AFT reliable?
The price and inventory of 74VHCT126AFT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT126AFT is usually 5 days.
3.What payment methods are accepted for 74VHCT126AFT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT126AFT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT126AFT?
74VHCT126AFT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT126AFT 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 74VHCT126AFT?
For technical support, including 74VHCT126AFT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT126AFT requirements.
6.How does Aetrix verify that 74VHCT126AFT is sourced from the original manufacturer or authorized distributors?
All 74VHCT126AFT 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 74VHCT126AFT meets industry standards.
7.What is the process for return or replacement of 74VHCT126AFT?
All 74VHCT126AFT units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT126AFT, 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 74VHCT126AFT part is unused and in its original packaging.
Return procedure for 74VHCT126AFT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74VHCT126AFT Tags
-
SN74LVC1G17DBVR
Texas Instruments
-
SN74LVC1G07DCKR
Texas Instruments
-
SN74LVC1G17DCKR
Texas Instruments
-
SN74LVC1G07DBVR
Texas Instruments
-
SN74LVC1G125DCKR
Texas Instruments
-
SN74AHCT1G126DBVR
Texas Instruments
-
SN74LVC1G125DBVR
Texas Instruments
-
SN74AHCT1G125DBVR
Texas Instruments
-
SN74LVC2G17DBVR
Texas Instruments
-
SN74LVC2G07DCKR
Texas Instruments
-
SN74LVC1G34DCKR
Texas Instruments
-
SN74LVC2G17DCKR
Texas Instruments
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
