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STMicroelectronics M74HC05B1R
- Part No.:
- M74HC05B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC05B1R.pdf
- Description:
- IC INVERTER 6CH 1-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,416
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Product details
Overview
M74HC05B1R from STMicroelectronics is a high-speed CMOS hex inverter with open-drain outputs, designed for level-shifting and wired-OR logic interfaces. It operates across 2V–6V supply, delivers 10ns typical propagation delay at 6V, supports ±25mA output current, and features 1µA max quiescent ICC at 25°C - used in industrial bus termination and I²C pull-up applications.
For engineers reviewing the M74HC05B1R datasheet, M74HC05B1R pinout, M74HC05B1R application, or M74HC05B1R equivalent, key selection criteria include open-drain drive capability, wide VCC range compatibility, input noise immunity (28% VCC min), and DIP-14 package suitability for through-hole prototyping and legacy board replacement.
Technical Context
The M74HC05B1R implements six independent inverting buffers with open-drain NMOS outputs, requiring external pull-up resistors to define high-level logic states. Its C2MOS silicon gate process enables rail-to-rail input voltage tolerance (0 to VCC) and low dynamic power consumption via CPD = 6.5pF.
All inputs integrate diode-based ESD protection (±20mA IK), and the 3-stage internal buffer architecture ensures stable switching with controlled rise/fall times (≤400ns at 6V). Output leakage remains ≤10µA over full temperature range (–55°C to +125°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing (e.g., 3.3V MCU driving 5V bus) |
| tPD (Typ.) | 10ns at VCC = 6V - enables >30MHz toggle rates in clocked logic paths |
| IO (Max) | ±25mA - drives standard TTL loads or multiple CMOS inputs directly |
| VNIH/VNIL | 28% VCC (min) - rejects >1.2V noise on 5V systems without false triggering |
| ICC (Max) | 1µA at TA = 25°C - suitable for battery-backed control logic with ultra-low standby drain |
| CIN / COUT | 5pF / 10pF - limits capacitive loading on high-speed data lines (e.g., I²C SDA/SCL) |
| Operating Temp | –55°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
Pinout & Package
Package: Plastic DIP-14 (dual in-line package, 0.3" width, through-hole mount).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 9, 11, 13 | Input (1A–6A) | CMOS-compatible logic inputs accepting 0–VCC voltage; internally protected against ±20mA ESD transients |
| 2, 4, 6, 8, 10, 12 | Open-Drain Output (1Y–6Y) | N-channel MOSFET drain terminals - require external pull-up to define HIGH state; sink up to 25mA |
| 7 | GND | Reference ground for all input thresholds and output discharge paths |
| 14 | VCC | Positive supply rail (2–6V); powers internal logic and defines input high/low thresholds |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain outputs | Enable wired-OR logic, I²C/SMBus bidirectional communication, and level translation without direction control |
| High noise immunity | 28% VCC input hysteresis margin prevents metastability in electrically noisy PLC backplanes |
| Wide VCC range | Single device replaces multiple 74LS/74HC variants across 2.0V, 3.3V, and 5V subsystems |
| Low ICC quiescent current | 1µA max at 25°C allows use in always-on supervisory circuits without compromising battery life |
| Full temperature rating | –55°C to +125°C operation supports deployment in engine control units and power converter gate drivers |
Applications
| I²C Bus Level Shifter | Industrial Digital Input Conditioning |
|---|---|
Use Scenario: Interfacing a 3.3V microcontroller I²C master to 5V slave peripherals. IC Role / Device Role / Timing Role: Open-drain inverters act as bidirectional voltage translators on SDA/SCL lines with external pull-ups. Use Value: Eliminates need for dedicated level-shifter ICs while maintaining I²C timing compliance (tPD < 10ns @ 6V). | Use Scenario: Converting 24V PLC field inputs to clean 5V logic signals for FPGA capture. IC Role / Device Role / Timing Role: Inverter with Schmitt-trigger-like noise margin conditions raw industrial inputs before sampling. Use Value: 28% VCC noise immunity rejects common-mode spikes on factory floor wiring without added RC filtering. |
| Wired-OR Logic for Fault Signaling | Legacy TTL Bus Termination |
Use Scenario: Aggregating fault flags from six independent motor drivers onto one shared alert line. IC Role / Device Role / Timing Role: Six open-drain outputs tied together form a single-wire OR'ed interrupt signal to host controller. Use Value: Hardware-wired fault aggregation reduces software polling overhead and guarantees sub-20ns response latency. | Use Scenario: Replacing obsolete 7405 in repair of vintage test equipment with 5V TTL backplanes. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement for 74-series open-drain inverters. Use Value: Maintains identical timing (tPD = 10ns typ.), drive strength, and layout footprint without PCB rework. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar hex open-drain inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC05N | Same logic function, identical DIP-14 pinout; slightly higher ICC (2µA max) and lower noise immunity (20% VCC) | Valid for commercial-temp (0°C to 70°C) designs only; not rated for –55°C operation | Select when cost is primary and extended temperature range is unnecessary |
| 74LVC05APW | TSSOP-14 package; 1.65V–5.5V VCC range; higher speed (tPD = 5.2ns @ 3.3V), but no –55°C rating | Requires PCB redesign for surface-mount assembly; unsuitable for high-reliability industrial environments | Choose for space-constrained, high-speed consumer electronics with 3.3V-only rails |
Compared with SN74HC05N and 74LVC05APW, the M74HC05B1R uniquely combines extended temperature support (–55°C to +125°C), DIP-14 through-hole compatibility, and 28% VCC noise immunity - making it the sole option for ruggedized legacy system upgrades and industrial field I/O modules.
Availability
M74HC05B1R is available at Aetrix Electronics and suitable for industrial automation, automotive body control modules, and legacy test equipment repair requiring stable component supply and long-term obsolescence mitigation.
Supply support for M74HC05B1R 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, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and power applications.
The M74HC05B1R belongs to ST's legacy HC logic family - engineered for pin-compatible replacement of 74-series devices while delivering improved speed, noise immunity, and power efficiency in industrial control and instrumentation systems.
FAQ
Can M74HC05B1R drive a 10kΩ pull-up resistor on a 5V I²C bus?
Yes. With VOL ≤ 0.1V at IO = 20µA and VCC = 5V, the output saturation voltage remains well below 0.4V - satisfying I²C standard LOW-level requirement (VOL ≤ 0.4V) even with 10kΩ pull-up. The 25mA sink capability further ensures robustness against bus capacitance and noise.
Is M74HC05B1R compatible with 3.3V-only microcontrollers?
Yes. Its 2V–6V VCC range and input thresholds referenced to VCC allow reliable operation with 3.3V supplies. VIH = 2.31V (min at VCC = 3.3V) and VIL = 0.99V (max) ensure clean recognition of 3.3V logic levels, and open-drain outputs interface seamlessly with 3.3V pull-ups.
Does M74HC05B1R require external decoupling capacitors?
Yes. A 100nF ceramic capacitor placed between VCC (pin 14) and GND (pin 7), as close as possible to the package, is required to suppress switching noise and maintain stable output transitions. This is critical for achieving specified tPD and noise immunity performance across temperature.
What is the maximum capacitive load the M74HC05B1R can drive reliably?
At VCC = 6V, the device maintains tPLZ/tPZL ≤ 23ns with CL = 50pF. Driving >100pF loads increases propagation delay nonlinearly and may cause ringing; for loads exceeding 50pF, add series resistance (e.g., 33Ω) near the output to dampen reflections and preserve signal integrity.
M74HC05B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Inverter
- Number of Circuits:
- 6
- Number of Inputs:
- 1
- Features:
- Open Drain
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 1 µA
- Current - Output High, Low:
- -, 5.2mA
- Input Logic Level - Low:
- 0.5V ~ 1.8V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 15ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
M74HC05B1R FAQ
1.How can I place an order for M74HC05B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC05B1R 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 M74HC05B1R reliable?
The price and inventory of M74HC05B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC05B1R is usually 5 days.
3.What payment methods are accepted for M74HC05B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC05B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC05B1R?
M74HC05B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC05B1R 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 M74HC05B1R?
For technical support, including M74HC05B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC05B1R requirements.
6.How does Aetrix verify that M74HC05B1R is sourced from the original manufacturer or authorized distributors?
All M74HC05B1R 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 M74HC05B1R meets industry standards.
7.What is the process for return or replacement of M74HC05B1R?
All M74HC05B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC05B1R, 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 M74HC05B1R part is unused and in its original packaging.
Return procedure for M74HC05B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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