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STMicroelectronics M74HC126RM13TR
- Part No.:
- M74HC126RM13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
M74HC126RM13TR.pdf
- Description:
- IC BUFFER NON-INVERT 6V 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,429
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Product details
Overview
M74HC126RM13TR from STMicroelectronics is a high-speed CMOS quad 3-state bus buffer with independent enable inputs per channel, operating across 2 V–6 V supply, delivering 8 ns typical propagation delay at 6 V, ±6 mA output drive, and -55 °C to +125 °C industrial temperature range - used in bidirectional data bus isolation for microcontroller peripheral interfaces.
For engineers reviewing the M74HC126RM13TR datasheet, M74HC126RM13TR pinout, M74HC126RM13TR application, or M74HC126RM13TR equivalent, key selection criteria include 3-state timing (tPZL/tPLZ), rail-to-rail input thresholds (VIH/VIL = 70%/30% VCC), SO14 package thermal profile, and compatibility with legacy 74LS126 signal routing.
Technical Context
The device implements four independent non-inverting buffers, each with dedicated active-low 3-state enable (G) controlling output impedance. All inputs feature diode-clamped ESD protection (HBM 2 kV, CDM 1 kV), and outputs exhibit symmetrical drive strength (|IOH| = IOL ≥ 6 mA at VCC = 4.5 V).
Propagation delays are balanced (tPLH ≅ tPHL), transition times are tightly controlled (tTLH/tTHL ≤ 15 ns at VCC = 4.5 V, CL = 50 pF), and noise immunity exceeds 28% of VCC for both high- and low-level inputs - enabling robust operation in mixed-signal PCB environments with shared ground planes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2 V to 6 V - supports direct interface with 3.3 V and 5 V logic families without level shifters |
| Propagation delay (tPLH/tPHL) | 8 ns typ. at VCC = 6 V, CL = 50 pF - enables ≤125 MHz bus toggle rates in buffered paths |
| Output drive (IOL/IOH) | ±6 mA min. at VCC = 4.5 V - sufficient to drive 10 LS-TTL loads or 20 CMOS inputs |
| Input threshold (VIH/VIL) | 70%/30% VCC min. - ensures reliable switching across full VCC range and temperature extremes |
| Quiescent current (ICC) | 4 μA max. at TA = 25 °C - enables use in low-power standby modes without significant leakage penalty |
| ESD rating (HBM) | 2 kV - meets IEC 61000-4-2 Level 2 for board-level handling and system integration |
| Operating temperature | -55 °C to +125 °C - qualified for extended industrial and under-hood automotive auxiliary circuits |
Pinout & Package
Package: SO14 (Small Outline, 14-pin, 3.9 mm body width, 1.27 mm pitch) per JEDEC MS-012, compliant with ECOPACK® environmental standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | 1G–4G (Active-High Enable) | Independent 3-state control per buffer; high = output enabled, low = high-Z - enables dynamic bus arbitration |
| 2, 5, 9, 12 | 1A–4A (Data Inputs) | CMOS-compatible inputs with hysteresis-free thresholds; accept 0–VCC swing without external pull-ups |
| 3, 6, 8, 11 | 1Y–4Y (Data Outputs) | Push-pull outputs with matched rise/fall characteristics; support hot-swap-capable bus sharing |
| 7 | GND | Dedicated ground reference for internal logic and output stage - must be low-inductance connection |
| 14 | VCC | Single positive supply pin - decoupling capacitor (100 nF) required within 5 mm for stable AC performance |
Key Features
| Feature | Design Value |
|---|---|
| High-speed buffering | 8 ns typical tPD at 6 V enables real-time data capture in 8-bit parallel interfaces |
| Low static power | 4 μA ICC max. allows inclusion in always-on monitoring nodes without battery drain impact |
| Rail-compatible thresholds | VIH/VIL track VCC proportionally - eliminates need for external biasing in multi-voltage systems |
| Robust 3-state control | Separate G inputs per channel permit selective bus segment isolation without global reset |
| Industrial-grade reliability | Qualified from -55 °C to +125 °C with 2 kV HBM ESD - suitable for factory automation controllers |
Applications
| Microcontroller Bus Isolation | Legacy Peripheral Interface |
|---|---|
|
Use Scenario: Isolating GPIO-expander I²C/SPI lines from main MCU bus during firmware updates. IC Role / Device Role / Timing Role: Quad buffer provides direction-controlled, glitch-free signal gating between domains. Use Value: Prevents spurious writes to peripherals during reset sequences by forcing high-Z on all four channels simultaneously. |
Use Scenario: Adapting 5 V parallel LCD controller signals to 3.3 V FPGA I/O banks. IC Role / Device Role / Timing Role: Level-shifting buffer with rail-to-rail input thresholds and matched tPLH/tPHL. Use Value: Eliminates external resistive dividers while maintaining <10 ns skew across 4-bit data lanes. |
| Industrial Sensor Multiplexing | Test Equipment Signal Routing |
|
Use Scenario: Sharing analog front-end ADC inputs among multiple sensor modules via time-division. IC Role / Device Role / Timing Role: 3-state-enabled signal selector with fast enable/disable timing (tPZL/tPLZ ≤ 19 ns). Use Value: Reduces crosstalk-induced offset errors by ensuring only one sensor path is active at any time. |
Use Scenario: Reconfigurable signal path in automated test fixtures for mixed-voltage DUTs. IC Role / Device Role / Timing Role: Bidirectional bus switch with independent channel enables and low capacitive loading (CIN = 5 pF). Use Value: Enables sub-100 ns path reconfiguration without signal integrity degradation on 50 Ω traces. |
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 |
|---|---|---|---|
| SN74HC126N | DIP-14 package only; no SO14 variant; identical electrical specs but lacks automotive qualification | Prototyping and breadboard use only - not suitable for surface-mount production or extended temperature operation | Select when manual assembly or through-hole layout is required and temperature range ≤ 85 °C suffices |
| 74HC126PW | TSSOP-14 package (4.4 mm × 5.0 mm); same SO14 pinout but smaller footprint and higher thermal resistance | Space-constrained PCBs where 30% area reduction is critical and thermal derating is managed externally | Select when board space is premium and thermal margin allows 10 mW/°C derating above 65 °C |
Compared with SN74HC126N and 74HC126PW, M74HC126RM13TR offers industrial-grade SO14 packaging with verified -55 °C to +125 °C operation and tape-and-reel delivery - making it optimal for volume SMT manufacturing in harsh-environment control systems.
Availability
M74HC126RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplanes, motor drive control panels, and railway signaling interfaces requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for M74HC126RM13TR 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 silicon solutions for smart mobility, power management, and industrial control markets.
M74HC126RM13TR belongs to the M74HC high-speed CMOS logic family, engineered specifically for noise-immune, low-power bus interfacing in industrial automation and instrumentation systems where reliability across wide temperature excursions is mandatory.
FAQ
What is the maximum clock frequency supported by M74HC126RM13TR in a data bus application?
The device does not operate as a clocked element but as a combinational buffer. Its 8 ns typical propagation delay at 6 V and 50 pF load supports reliable data toggling up to approximately 125 MHz in point-to-point configurations. System-level frequency limits depend on trace length, termination, and fan-out - not internal clocking.
Can M74HC126RM13TR drive a 50 Ω transmission line directly?
No. Its output drive capability (±6 mA) is rated into resistive loads, not 50 Ω transmission lines. Driving such lines requires external series termination or a dedicated line driver IC. Direct connection risks signal reflection, overshoot, and excessive current draw beyond absolute maximum ratings.
Is the SO14 package RoHS-compliant and lead-free?
Yes. The M74HC126RM13TR uses an ECOPACK®-compliant SO14 package with lead-free terminations and halogen-free molding compound, meeting RoHS Directive 2011/65/EU and REACH SVHC requirements as documented in ST's official compliance statements.
How does the 3-state enable timing affect bus contention risk?
tPZL (enable-to-output-low) and tPLZ (disable-to-high-Z) are both ≤19 ns at VCC = 4.5 V. This tight window minimizes bus float time during state transitions, reducing the risk of contention when multiple buffers share a common bus - provided enable signals are synchronized with setup/hold margins relative to data edges.
M74HC126RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
M74HC126RM13TR FAQ
1.How can I place an order for M74HC126RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC126RM13TR 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 M74HC126RM13TR reliable?
The price and inventory of M74HC126RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC126RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC126RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC126RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC126RM13TR?
M74HC126RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC126RM13TR 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 M74HC126RM13TR?
For technical support, including M74HC126RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC126RM13TR requirements.
6.How does Aetrix verify that M74HC126RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC126RM13TR 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 M74HC126RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC126RM13TR?
All M74HC126RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC126RM13TR, 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 M74HC126RM13TR part is unused and in its original packaging.
Return procedure for M74HC126RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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