My Inquiry
My Account
STMicroelectronics M74HC126YTTR
- Part No.:
- M74HC126YTTR
- Manufacturer:
- STMicroelectronics
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
M74HC126YTTR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,148
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M74HC126YTTR from STMicroelectronics is a high-speed CMOS quad 3-state bus buffer with automotive-grade qualification (AEC-Q100), operating from 2 V to 6 V, featuring 8 ns typical propagation delay at 6 V, ±6 mA output drive, and -40 °C to +125 °C temperature range - used in bidirectional data bus isolation for automotive infotainment head units.
For engineers reviewing the M74HC126YTTR datasheet, M74HC126YTTR pinout, M74HC126YTTR application, or M74HC126YTTR equivalent, this page delivers verified electrical specs, TSSOP14 package details, truth table behavior, and automotive-qualified alternatives aligned with real-world bus interface design requirements.
Technical Context
The M74HC126YTTR implements four independent non-inverting buffers, each with dedicated active-high 3-state enable (G) control. All inputs include ESD protection (HBM: 2 kV, CDM: 1 kV), and outputs exhibit symmetrical drive strength (|IOH| = IOL ≥ 6 mA at VCC = 4.5 V).
It operates across 2–6 V supply, supports fast edge rates (tr/tf ≤ 400 ns at 6 V), and maintains balanced tPLH ≅ tPHL propagation delays. The device uses silicon gate C2MOS technology and is fully pin- and function-compatible with standard 74 series 126 logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters |
| Propagation Delay | 8 ns (typ.) at VCC = 6 V, CL = 50 pF - supports >10 MHz bus toggle rates in buffered data paths |
| Output Drive | ±6 mA (min.) at VCC = 4.5 V - sufficient to drive 50-pF loads across PCB traces with clean edges |
| Input Thresholds | VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V - provides 28 % VCC noise margin for robust operation in noisy automotive environments |
| Quiescent Current | 4 μA (max.) at TA = 25 °C - ensures negligible standby power in always-on vehicle modules |
| ESD Rating | HBM: 2 kV, CDM: 1 kV - meets baseline automotive board-level ESD immunity requirements |
| Operating Temp | -40 °C to +125 °C - qualified for under-hood and dashboard-mounted electronics per AEC-Q100 Grade 1 |
Pinout & Package
TSSOP14 (Thin Shrink Small Outline Package, 14-pin) - 5.0 mm × 6.4 mm body, 0.65 mm pitch, 0.75 mm max height, lead-free and RoHS-compliant per ECOPACK® specifications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1G–4G (Enable Inputs) | Active-high 3-state controls: logic HIGH disables output (Z-state); tied together or individually managed for selective bus gating |
| 2, 5, 9, 12 | 1A–4A (Data Inputs) | CMOS-compatible inputs accepting 0–VCC logic levels; internally protected against ±20 mA transient current |
| 3, 6, 8, 11 | 1Y–4Y (Data Outputs) | Non-inverting buffered outputs with symmetrical sourcing/sinking capability; high-impedance when corresponding G = LOW |
| 7 | GND | Digital ground reference; must be low-inductance connection to minimize switching noise coupling |
| 14 | VCC | Positive supply rail (2–6 V); requires local 100 nF ceramic decoupling within 5 mm of pin |
Key Features
| Feature | Design Value |
|---|---|
| High-speed buffering | 8 ns typical tPD at 6 V enables reliable 12.5 MHz data throughput on shared buses |
| Automotive qualification | AEC-Q100 Grade 1 compliance ensures reliability in extended temperature and vibration environments |
| Symmetrical output drive | Matched |IOH|/IOL minimizes duty cycle distortion in clock or data signals routed through buffer |
| Wide voltage operation | 2–6 V range allows single part to serve both legacy 5 V and modern 3.3 V subsystems |
| Low static power | 4 μA max ICC reduces system-level quiescent current in battery-backed modules |
Applications
| Automotive Infotainment Bus Isolation | Industrial PLC I/O Expansion |
|---|---|
|
Use Scenario: Isolating MCU GPIO banks from shared CAN/FlexRay transceiver control lines in head unit designs. IC Role / Device Role / Timing Role: Quad non-inverting buffer with per-channel 3-state control manages direction and contention on multi-drop control buses. Use Value: Prevents signal contention during hot-swap of peripheral modules while maintaining <10 ns timing margin for 8 MHz SPI-based configuration interfaces. |
Use Scenario: Extending microcontroller I/O count to drive discrete 24 V digital inputs in modular PLC backplanes. IC Role / Device Role / Timing Role: Level-translating buffer stage between 3.3 V logic and optocoupler input circuits with galvanic isolation. Use Value: Enables safe 24 V field-side interfacing without external level shifters, leveraging 6 mA drive to reliably bias input LEDs. |
| Medical Diagnostic Equipment Data Routing | Test & Measurement Instrumentation |
|
Use Scenario: Gating ADC sample-and-hold data lanes to multiple FPGA processing channels in portable ultrasound systems. IC Role / Device Role / Timing Role: Synchronized 3-state enable allows time-multiplexed access to shared memory buffers without bus contention. Use Value: Eliminates need for discrete MOSFET switches; 8 ns delay preserves sub-100 ns timing alignment critical for 10+ MSPS sampling clocks. |
Use Scenario: Buffering precision DAC output signals before distribution to multiple analog front-end channels in benchtop DMMs. IC Role / Device Role / Timing Role: Low-noise, high-impedance output stage isolates DAC core from capacitive loading variations across measurement paths. Use Value: Maintains monotonicity and settling time integrity (<1 µs to 0.1 %) despite 50–100 pF channel-to-channel load differences. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC126QPWRQ1 | TI's AEC-Q100 Grade 1 TSSOP14 variant; identical AC/DC specs but higher ICC (20 μA max) and lower ESD (HBM: 1.5 kV) | Validated for same automotive temp range but lacks ST's advanced screening per AEC-Q001/Q002 | Select when TI supply chain preference or existing footprint reuse is prioritized over enhanced ESD robustness |
| 74HC126D,118 | Nexperia SO14 version; same logic function but wider -40 °C to +125 °C rating, no automotive qualification, 10 ns tPD (typ.) | Cost-optimized for industrial control boards where AEC-Q100 is not mandated | Choose for non-automotive applications requiring SO14 footprint and lower unit cost |
Compared with SN74HC126QPWRQ1 and 74HC126D,118, the M74HC126YTTR delivers superior ESD resilience (2 kV HBM), tighter propagation delay (8 ns vs. 10 ns), and full AEC-Q001/Q002 screening - making it optimal for safety-critical automotive subsystems where signal integrity and long-term reliability are non-negotiable.
Availability
M74HC126YTTR is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O expansion, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HC126YTTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for automotive, industrial, and consumer markets.
The M74HC126YTTR belongs to ST's high-reliability HC logic family, engineered specifically for automotive and industrial applications demanding extended temperature operation, robust ESD performance, and long-term supply stability.
FAQ
Is M74HC126YTTR pin-compatible with standard 74HC126 devices?
Yes - M74HC126YTTR is fully pin- and function-compatible with industry-standard 74HC126 logic, including identical pin numbering, truth table behavior, and electrical interface characteristics. Its TSSOP14 footprint matches JEDEC MO-153, enabling drop-in replacement where space-constrained layouts require surface-mount packaging.
What is the maximum capacitive load this buffer can drive reliably?
The M74HC126YTTR is characterized up to 150 pF load capacitance in AC testing (tPLH/tPHL measured at CL = 150 pF). With its ±6 mA output drive at 4.5 V, it maintains <27 ns propagation delay and <32 ns transition time into 150 pF, supporting stable operation on PCB traces and moderate fan-out without signal degradation.
Does this device support mixed-voltage interfacing (e.g., 3.3 V input to 5 V output)?
No - M74HC126YTTR is a non-level-shifting buffer: inputs and outputs operate referenced to the same VCC rail. It accepts VIH/VIL thresholds scaled to VCC (e.g., 3.15 V at 4.5 V), so interfacing across different supply domains requires external level translators or compatible voltage rails.
How does the automotive qualification affect solder reflow profile requirements?
M74HC126YTTR follows standard lead-free reflow profiles (J-STD-020D): peak temperature 260 °C, time above liquidus 60–150 s. Its AEC-Q100 qualification confirms reliability after thermal cycling (-40 °C to +125 °C, 1000 cycles) and does not impose special reflow constraints beyond JEDEC Class 3 moisture sensitivity (MSL3, floor life 168 h at 30 °C/60 % RH).
M74HC126YTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- 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:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
M74HC126YTTR FAQ
1.How can I place an order for M74HC126YTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC126YTTR 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 M74HC126YTTR reliable?
The price and inventory of M74HC126YTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC126YTTR is usually 5 days.
3.What payment methods are accepted for M74HC126YTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC126YTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC126YTTR?
M74HC126YTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC126YTTR 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 M74HC126YTTR?
For technical support, including M74HC126YTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC126YTTR requirements.
6.How does Aetrix verify that M74HC126YTTR is sourced from the original manufacturer or authorized distributors?
All M74HC126YTTR 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 M74HC126YTTR meets industry standards.
7.What is the process for return or replacement of M74HC126YTTR?
All M74HC126YTTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC126YTTR, 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 M74HC126YTTR part is unused and in its original packaging.
Return procedure for M74HC126YTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M74HC126YTTR 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…
