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STMicroelectronics M74HC541B1R
- Part No.:
- M74HC541B1R
- Manufacturer:
- STMicroelectronics
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC541B1R.pdf
- Description:
- IC BUFFER NON-INVERT 6V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,481
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Product details
Overview
M74HC541B1R from STMicroelectronics is an octal non-inverting 3-state bus buffer IC designed for bidirectional data bus isolation in digital systems. It features propagation delay of 9 ns (typ. at VCC = 6 V), symmetrical output drive (±6 mA), and operates across 2 V to 6 V supply range. Used in microcontroller address/data bus buffering, memory interfacing, and peripheral I/O expansion.
For engineers reviewing the M74HC541B1R datasheet, M74HC541B1R pinout, M74HC541B1R application, or M74HC541B1R equivalent, key selection criteria include 3-state enable logic (dual-input AND gate), high noise immunity (28% VCC), balanced tPLH/tPHL timing, and DIP-20 package compatibility with legacy 74-series layouts.
Technical Context
The M74HC541B1R implements eight independent non-inverting buffers, each with three-state control governed by a dual-input AND gate (G1 ∧ G2) - both enables must be HIGH to place outputs in high-impedance state. Inputs are protected against ESD and transient overvoltage.
It uses silicon gate C2MOS technology for low static power (ICC ≤ 4 µA at TA = 25°C) and wide temperature operation (–55°C to +125°C). Propagation delays remain balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 6 mA), supporting clean signal integrity on shared buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V MCU to 5 V peripheral) |
| tPD (Typ.) | 9 ns at VCC = 6 V - enables high-speed bus handshaking up to ~55 MHz clock-equivalent rates |
| IOL / IOH | ≥ 6 mA - drives standard TTL loads and multiple CMOS inputs without external pull-ups |
| VNIH / VNIL | 28% VCC (min) - rejects >1.4 V noise on 5 V bus, improving robustness in noisy industrial environments |
| ICC (Max) | 40 µA at –40°C to +85°C - ensures ultra-low standby power in battery-backed or energy-sensitive applications |
| Operating Temp | –55°C to +125°C - qualified for automotive under-hood and industrial control cabinet deployment |
| Input Capacitance | 5 pF (typ.) - minimizes capacitive loading on driving gates, preserving edge rate in dense PCB layouts |
Pinout & Package
Package: Plastic DIP-20 (0.300" width), 20-pin through-hole, JEDEC MS-001 compliant. Pin layout places all inputs (A1–A8, G1, G2) on left side and outputs (Y1–Y8) on right side to simplify PCB routing and reduce crosstalk.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 | Active-HIGH 3-state enable inputs; both must be HIGH for output drivers to activate |
| 2–9 | A1–A8 | Non-inverting data inputs; buffered directly to corresponding Y outputs when enabled |
| 11–18 | Y1–Y8 | Tri-stateable buffered outputs; present A1–A8 logic level or high-Z when G1/G2 not both asserted |
| 10 | GND | Digital ground reference; decoupling capacitor required near pin for noise suppression |
| 20 | VCC | Positive supply rail; requires local 100 nF ceramic bypass capacitor to minimize switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible with 74LS541 | Direct drop-in replacement for legacy TTL bus buffers without redesigning footprint or netlist |
| Input/Output separation | Opposite-side pin arrangement reduces trace crossing and improves signal integrity on double-layer PCBs |
| ESD protection | All inputs include integrated diode clamps - withstands ±2 kV HBM per JESD22-A114 |
| Low ICC quiescent current | 4 µA max at 25°C - extends battery life in always-on monitoring nodes and portable instrumentation |
| Wide VCC tolerance | Operates down to 2 V - supports direct interface with low-voltage microcontrollers (e.g., ARM Cortex-M0+) |
Applications
| Microcontroller Bus Interface | Memory Address Latching |
|---|---|
Use Scenario: Isolating an 8-bit microcontroller data bus from external peripherals during read/write cycles. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer enabling bidirectional data flow control with precise timing alignment. Use Value: Prevents bus contention during multi-peripheral access; tPLH/tPHL balance ensures deterministic setup/hold margins. | Use Scenario: Driving address lines to parallel EEPROM or SRAM chips in embedded systems. IC Role / Device Role / Timing Role: Address bus driver with high sink/source capability and low propagation skew. Use Value: Supports reliable 10+ ns address setup time at 5 MHz bus clocks; 6 mA drive sustains signal integrity over 10 cm traces. |
| Industrial I/O Expansion | Legacy System Upgrade |
Use Scenario: Adding isolated digital I/O channels to PLC backplanes using standardized 5 V logic rails. IC Role / Device Role / Timing Role: Level-shifting and bus-isolation buffer between controller and field I/O modules. Use Value: 28% VCC noise margin rejects EMI from solenoids/motors; –55°C to +125°C rating ensures field reliability. | Use Scenario: Replacing obsolete 74LS541 in aging test equipment while retaining same PCB layout. IC Role / Device Role / Timing Role: Pin- and function-compatible CMOS upgrade with lower power and higher noise immunity. Use Value: Eliminates need for heat sinks; 4 µA ICC reduces board-level thermal load versus 74LS series' ~20 mA typical. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC541N | Same logic function and pinout; TI version rated for –40°C to +85°C only (vs. ST's –55°C to +125°C) | Limited to commercial/industrial ambient; unsuitable for extended-temperature automotive or aerospace use | Select if operating temperature ≤ 85°C and TI supply chain preference applies |
| 74VHC541N | Higher speed (tPD = 5.5 ns typ. at VCC = 5 V); lower ICC (2 µA typ.), but reduced noise margin (20% VCC) | Better for high-frequency timing-critical paths; less tolerant of power rail ripple or EMI | Choose when propagation delay < 7 ns is mandatory and noise environment is controlled |
Compared with SN74HC541N and 74VHC541N, the M74HC541B1R offers the widest temperature range and highest noise immunity - critical for harsh-environment deployments where reliability outweighs marginal speed gains.
Availability
M74HC541B1R is available at Aetrix Electronics and suitable for microcontroller bus interface, memory address latching, and industrial I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HC541B1R 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, specializing in automotive, industrial, and power management ICs with vertical manufacturing capabilities.
The M74HC541B1R belongs to ST's high-speed CMOS logic family, engineered for robust interoperability with legacy TTL systems while delivering low-power, high-noise-immunity performance in space-constrained embedded designs.
FAQ
What is the maximum recommended operating voltage for M74HC541B1R?
The absolute maximum supply voltage is +7 V, but the recommended operating range is 2 V to 6 V per datasheet Section 3. Exceeding 6 V risks accelerated parametric drift and reduced long-term reliability, even if functional at 6.5 V in short-term tests. For 5 V systems, operation at exactly 5.0 V ±5% is optimal.
How does the dual-enable logic (G1 and G2) affect bus arbitration?
G1 and G2 form a wired-AND enable: both must be HIGH to activate outputs; any LOW forces all Y1–Y8 into high-impedance. This allows hierarchical bus control - e.g., one controller asserts G1 while another controls G2, enabling coordinated access without external logic.
Can M74HC541B1R drive a 50 pF load at 10 MHz without signal degradation?
Yes. With CL = 50 pF and VCC = 5 V, tPLH/tPHL is 17 ns (max), and output transition time is 19 ns (max), ensuring clean edges at 10 MHz (100 ns period). The 6 mA drive strength maintains <0.4 V VOL under load, meeting TTL and 5 V CMOS input thresholds reliably.
Is the DIP-20 package RoHS-compliant and lead-free?
Yes. Per STMicroelectronics documentation (Doc ID 11727, Rev 5), the M74HC541B1R in plastic DIP-20 packaging is RoHS-compliant and lead-free, with matte tin lead finish. No exemptions apply, and it meets JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30°C/60% RH).
M74HC541B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- 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:
- Through Hole
- Supplier Device Package:
- 20-DIP
M74HC541B1R FAQ
1.How can I place an order for M74HC541B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC541B1R 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 M74HC541B1R reliable?
The price and inventory of M74HC541B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC541B1R is usually 5 days.
3.What payment methods are accepted for M74HC541B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC541B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC541B1R?
M74HC541B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC541B1R 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 M74HC541B1R?
For technical support, including M74HC541B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC541B1R requirements.
6.How does Aetrix verify that M74HC541B1R is sourced from the original manufacturer or authorized distributors?
All M74HC541B1R 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 M74HC541B1R meets industry standards.
7.What is the process for return or replacement of M74HC541B1R?
All M74HC541B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC541B1R, 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 M74HC541B1R part is unused and in its original packaging.
Return procedure for M74HC541B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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