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STMicroelectronics M74HC27B1R
- Part No.:
- M74HC27B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC27B1R.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,308
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Product details
Overview
M74HC27B1R from STMicroelectronics is a high-speed CMOS triple 3-input NOR gate in 14-pin DIP package, operating from 2V to 6V supply, with typical propagation delay of 9ns at 6V, symmetrical output drive (±4mA), and high noise immunity (28% VCC). It serves as combinational logic for reset generation, enable control, and bus arbitration in industrial control panels.
For engineers reviewing the M74HC27B1R datasheet, M74HC27B1R pinout, M74HC27B1R application, or M74HC27B1R equivalent, key selection criteria include verified 3-input NOR functionality, DIP-14 through-hole compatibility, guaranteed 4mA output drive at 6V, and operation across -55°C to +125°C industrial temperature range.
Technical Context
The M74HC27B1R implements three independent 3-input NOR gates using silicon gate C2MOS technology, each with buffered output stages to ensure stable switching and high noise margin. Its internal structure provides matched tPLH/tPHL delays and symmetrical |IOH|/IOL drive capability.
It operates within a wide VCC range (2–6V) and supports input rise/fall times up to 1000ns at 2V, enabling robust interfacing with legacy TTL and mixed-voltage logic systems without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - Enables direct interface with 3.3V and 5V logic families without voltage translation. |
| tPD (Typ.) | 9ns at VCC = 6V - Supports >50 MHz toggle rates in critical timing paths. |
| IOL / IOH | ±4mA min. - Drives standard 74HC loads and small capacitive buses (≤50pF) reliably. |
| VNIH / VNIL | 28% VCC min. - Ensures ≥1.68V noise margin at 6V supply, rejecting common-mode transients. |
| ICC (Max) | 1µA at TA = 25°C - Enables ultra-low static power in battery-backed or always-on monitoring circuits. |
| Operating Temp | -55°C to +125°C - Qualified for under-hood automotive, industrial PLC, and aerospace avionics environments. |
Pinout & Package
Package: Plastic DIP-14 (Dual In-line Package), 0.3" wide body, through-hole mounting, JEDEC MS-001 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 9 | 1A, 2A, 3A - Input A of NOR Gates 1–3 | Three independent logic inputs accepting 0–VCC voltage levels; ESD-protected. |
| 2, 4, 10 | 1B, 2B, 3B - Input B of NOR Gates 1–3 | Second input per gate; identical DC and AC specs to Pin A terminals. |
| 13, 5, 11 | 1C, 2C, 3C - Input C of NOR Gates 1–3 | Third input per gate; enables full 3-input NOR boolean function (Y = NOT(A+B+C)). |
| 12, 6, 8 | 1Y, 2Y, 3Y - Output Y of NOR Gates 1–3 | Active-low open-drain compatible outputs; capable of sourcing/sinking ±4mA. |
| 7 | GND | Logic ground reference; must be connected to system 0V plane with low-inductance path. |
| 14 | VCC | Positive supply rail; bypassing with 100nF ceramic capacitor near pin is mandatory for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Triple 3-input NOR architecture | Provides three independent Boolean NOR functions in one package, reducing board space vs. discrete gate arrays. |
| Buffered output stage | Eliminates output waveform distortion and improves fan-out capability to ≥10 74HC loads. |
| Input ESD protection | Integrated diode clamps withstand ±2kV HBM, enabling safe handling and assembly without external TVS. |
| Wide VCC tolerance | Operates correctly across 2V–6V, supporting both 3.3V microcontroller I/O and legacy 5V backplane logic. |
Applications
| Industrial PLC Input Conditioning | Automotive Body Control Module |
|---|---|
Use Scenario: Detecting simultaneous activation of three safety interlock switches before enabling motor drive. IC Role / Device Role / Timing Role: Combinational logic gate performing real-time hardware-level AND-NOT (NOR) evaluation with sub-10ns latency. Use Value: Eliminates software polling delay and MCU interrupt latency, ensuring deterministic <100ns response to fault conditions. | Use Scenario: Generating master reset signal when ignition OFF, door open, and brake pedal released occur concurrently. IC Role / Device Role / Timing Role: Hardware-based reset arbiter combining three sensor inputs into single active-low system reset. Use Value: Guarantees fail-safe reset assertion without firmware dependency or clock domain crossing risks. |
| Legacy Bus Arbitration Logic | Test Equipment Signal Gating |
Use Scenario: Resolving bus contention between three legacy ISA peripheral cards sharing a single IRQ line. IC Role / Device Role / Timing Role: Priority encoder pre-logic element detecting exclusive request patterns on shared control lines. Use Value: Reduces arbitration latency by 3× versus software-polling schemes, improving throughput in data acquisition systems. | Use Scenario: Enabling analog signal path only when calibration mode, test trigger, and valid reference are all asserted. IC Role / Device Role / Timing Role: Safety-critical gating logic preventing erroneous signal injection during equipment self-test sequences. Use Value: Prevents false measurements by enforcing strict 3-input hardware validation before analog switch activation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple 3-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC27N | Same logic function, identical pinout, but TI's version specifies tPD = 12ns (typ.) at 6V and ICC = 2µA (max.) at 25°C. | Marginally slower propagation and higher quiescent current; suitable where 3ns delay penalty is acceptable. | Select SN74HC27N only if TI's supply chain or qualification history better matches OEM procurement requirements. |
| 74VHC27N | Higher speed (tPD = 5.5ns typ. at 5V), lower ICC (0.5µA max.), but narrower VCC range (2V–5.5V) and no -55°C rating. | Not qualified for extended temperature or 6V operation; unsuitable for automotive under-hood use. | Choose 74VHC27N only for commercial-grade 3.3V/5V systems requiring maximum speed and lowest static power. |
Compared with SN74HC27N and 74VHC27N, the M74HC27B1R uniquely combines 9ns speed, 1µA ICC, full -55°C to +125°C rating, and 6V operation-making it the sole option for high-reliability industrial and automotive applications demanding all four attributes simultaneously.
Availability
M74HC27B1R is available at Aetrix Electronics and suitable for industrial PLC input conditioning, automotive body control modules, legacy bus arbitration logic, and test equipment signal gating requiring stable component supply across extended temperature ranges.
Supply support for M74HC27B1R 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 consumer markets.
The M74HC27B1R belongs to ST's high-speed CMOS logic family, engineered specifically for robust, low-power, wide-voltage combinational logic in harsh-environment industrial and transportation systems.
FAQ
Is M74HC27B1R pin-compatible with standard 74LS27?
Yes, M74HC27B1R is pin- and function-compatible with 74LS27, but operates at higher speed (9ns vs. ~15ns) and lower power (1µA vs. ~10mA). Voltage levels differ: HC logic uses CMOS thresholds (VIL ≤ 1.8V, VIH ≥ 4.2V at 6V), while LS uses TTL thresholds. Direct replacement requires verifying input voltage compatibility.
What is the maximum capacitive load this device can drive reliably?
M74HC27B1R is characterized for CL = 50pF in AC testing, and its ±4mA output drive supports stable operation into ≤50pF loads at 6V. For heavier loads (>70pF), propagation delay increases nonlinearly and output rise/fall times degrade; external buffer stages are recommended beyond this limit.
Does M74HC27B1R support mixed-voltage interfacing (e.g., 3.3V inputs driving a 5V-powered device)?
No-M74HC27B1R does not support mixed-voltage operation. Inputs must remain within 0V to VCC. Driving it with 3.3V signals while powered at 5V violates VIH minimum (3.15V at VCC=4.5V), risking undefined logic states. Use level translators or select VCC = 3.3V if interfacing with 3.3V systems.
Is there a surface-mount alternative to M74HC27B1R in stock at Aetrix?
Yes-M74HC27M1R (SO-14) and M74HC27TTR (TSSOP-14) are in-stock surface-mount variants. Both share identical logic, timing, and DC specs with M74HC27B1R, differing only in package dimensions and thermal resistance. SO-14 offers 110°C/W θJA; TSSOP-14 offers 160°C/W θJA and 5mm × 4.4mm footprint.
M74HC27B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 1 µA
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Input Logic Level - Low:
- 0.5V ~ 1.8V
- Input Logic Level - High:
- 1.5V ~ 4.2V
- Max Propagation Delay @ V, Max CL:
- 14ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
M74HC27B1R FAQ
1.How can I place an order for M74HC27B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC27B1R 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 M74HC27B1R reliable?
The price and inventory of M74HC27B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC27B1R is usually 5 days.
3.What payment methods are accepted for M74HC27B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC27B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC27B1R?
M74HC27B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC27B1R 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 M74HC27B1R?
For technical support, including M74HC27B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC27B1R requirements.
6.How does Aetrix verify that M74HC27B1R is sourced from the original manufacturer or authorized distributors?
All M74HC27B1R 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 M74HC27B1R meets industry standards.
7.What is the process for return or replacement of M74HC27B1R?
All M74HC27B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC27B1R, 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 M74HC27B1R part is unused and in its original packaging.
Return procedure for M74HC27B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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