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STMicroelectronics M74HC32B1R
- Part No.:
- M74HC32B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC32B1R.pdf
- Description:
- IC GATE OR 4CH 2-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
M74HC32B1R from STMicroelectronics is a high-speed CMOS quad 2-input OR gate in 14-pin DIP package, operating from 2V to 6V supply, with typical propagation delay of 8ns at 6V, symmetrical output drive (±4mA), and high noise immunity (28% VCC). It serves as a logic-level combinatorial gate in industrial control signal routing, power-on sequencing, and digital interface enable logic.
For engineers reviewing the M74HC32B1R datasheet, M74HC32B1R pinout, M74HC32B1R application, or M74HC32B1R equivalent, this page delivers verified electrical parameters, functional pin mapping, real-world use cases, and validated alternative options for legacy-compatible 74HC-series logic design.
Technical Context
The M74HC32B1R implements four independent OR gates using silicon gate C2MOS technology, each with buffered output stages that ensure stable switching and high noise rejection. Its symmetrical output impedance (|IOH| = IOL ≥ 4mA) and balanced tPLH/tPHL delays support clean signal fan-out in mixed-voltage systems.
Designed for wide-supply operation (2–6V), it maintains guaranteed VIH/VIL thresholds across temperature (–55°C to +125°C) and meets stringent static discharge protection per internal input diode clamping. Input rise/fall time limits are specified up to 1000ns at 2V, enabling compatibility with slow-edge microcontroller GPIOs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports direct interfacing with 3.3V and 5V logic families without level shifters |
| tPD (Typ.) | 8ns at VCC = 6V - enables sub-100MHz combinational logic timing in synchronous designs |
| IOL / IOH | ≥ 4mA - drives standard TTL loads or multiple 74HC inputs (fan-out ≥ 10) |
| VIH / VIL | 3.15V / 1.35V at VCC = 4.5V - ensures robust noise margin (>1.3V) in noisy industrial environments |
| ICC (Max) | 1µA at TA = 25°C - enables ultra-low-static-power operation in battery-backed or standby circuits |
| Operating Temp | –55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
| CIN | 5pF - minimizes capacitive loading on driving sources, preserving signal edge integrity |
Pinout & Package
Package: Plastic DIP-14 (dual in-line package, 0.3" width, through-hole mounting).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | Input A (Gate 1–4) | First input of each OR gate; accepts 0–VCC logic levels with ±20µA leakage |
| 2, 5, 10, 13 | Input B (Gate 1–4) | Second input of each OR gate; electrically identical to Pin A inputs |
| 3, 6, 8, 11 | Output Y (Gate 1–4) | Active-high OR output; capable of sourcing/sinking ≥4mA with rail-to-rail swing |
| 7 | GND | Logic ground reference; must be connected before VCC to prevent latch-up |
| 14 | VCC | Positive supply rail; decoupling capacitor (100nF) required within 1cm for stable AC operation |
Key Features
| Feature | Design Value |
|---|---|
| High noise immunity | VNIH/VNIL = 28% VCC min - rejects common-mode transients up to ±1.7V at 6V supply |
| Symmetrical output drive | |IOH| = IOL ≥ 4mA - eliminates skew between rising/falling edges in bus arbitration logic |
| Balanced propagation delays | tPLH ≅ tPHL - ensures predictable setup/hold timing in feedback or clock-gating paths |
| ESD-protected inputs | Internal diode clamps - withstands ≥2kV HBM without external TVS components |
| Wide voltage operation | 2V–6V range - interoperable with 2.5V FPGA I/O, 3.3V MCU, and 5V legacy peripherals |
Applications
| Industrial PLC Input Conditioning | Automotive Body Control Module |
|---|---|
Use Scenario: Aggregating multiple sensor fault signals (e.g., door open, seatbelt unfastened, hood ajar) into a single OR'd warning flag. IC Role / Device Role / Timing Role: Combinatorial logic gate performing real-time Boolean OR of asynchronous safety inputs. Use Value: Enables fail-safe detection with no propagation delay penalty (<8ns), meeting ISO 16750-2 transient immunity requirements via inherent noise margin. | Use Scenario: Enabling power to auxiliary lighting circuits only when ignition ON AND headlight switch is active. IC Role / Device Role / Timing Role: Gate-level enable logic combining two control signals before driving a MOSFET load switch. Use Value: Eliminates need for microcontroller polling; operates reliably across –40°C to +125°C ambient without derating. |
| Legacy System Bus Arbitration | Medical Device Power-On Self-Test |
Use Scenario: Resolving bus grant requests from multiple peripheral controllers onto a shared data bus. IC Role / Device Role / Timing Role: Priority-agnostic OR node generating composite BUS_REQ signal for central arbiter. Use Value: Delivers deterministic <10ns delay variation across channels, preventing metastability in synchronous arbitration state machines. | Use Scenario: Validating presence of all critical subsystems (CPU, RAM, ADC) before releasing reset to main controller. IC Role / Device Role / Timing Role: Final-stage "all-clear" combiner asserting SYSTEM_READY only when all self-test flags are high. Use Value: Achieves <1µA quiescent current during standby, extending battery life in portable diagnostic instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC32N | Identical logic function and DC specs; tPD = 9ns (typ.) at 6V; same DIP-14 footprint | No difference in pinout or thermal profile; TI version uses different oxide process but same JEDEC timing bin | Select for dual-sourcing where TI's long-term availability program is preferred |
| CD74HC32E | Slightly higher ICC (2µA max); tPD = 10ns (typ.) at 6V; identical VCC range and output drive | Same mechanical fit; minor timing degradation acceptable in non-critical glue logic | Choose when cost sensitivity outweighs 2ns delay penalty in low-frequency control planes |
Compared with SN74HC32N and CD74HC32E, the M74HC32B1R offers the lowest typical propagation delay (8ns) and tightest ICC guarantee (1µA), making it optimal for timing-critical or ultra-low-power industrial control nodes where marginal performance gains directly impact system responsiveness or battery runtime.
Availability
M74HC32B1R is available at Aetrix Electronics and suitable for industrial PLC input conditioning, automotive body control modules, and legacy system bus arbitration requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HC32B1R 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, specializing in automotive, industrial, and power management ICs with broad analog, digital, and mixed-signal portfolios.
The M74HC32B1R belongs to ST's legacy high-speed CMOS logic family, designed specifically for drop-in replacement of obsolete 74LS devices while delivering lower power, wider voltage range, and enhanced noise immunity in industrial control and instrumentation.
FAQ
Is M74HC32B1R compatible with 5V TTL logic inputs?
Yes - its VIH minimum is 3.15V at VCC = 4.5V and 4.2V at VCC = 6V, exceeding TTL's 2.0V VIH threshold. Inputs tolerate 0–VCC voltage range and include internal clamping diodes, allowing safe interfacing with 5V TTL outputs without external resistors or level shifters.
What is the maximum capacitive load this device can drive reliably?
The M74HC32B1R is characterized with CL = 50pF in AC specs and guarantees tPLH/tPHL ≤ 19ns (max) at 6V. Driving >100pF may increase transition time and reduce noise margin; for loads above 50pF, add series termination or verify timing margins using the CPD = 21pF value and ICC(opr) = CPD × VCC × fIN + ICC/4 formula.
Does M74HC32B1R support mixed-voltage operation between inputs and VCC?
No - all inputs must remain within 0V to VCC. The absolute maximum rating specifies VI = –0.5V to VCC + 0.5V, and operation outside 0–VCC risks undefined output states or increased ICC. For mixed-voltage systems, use dedicated level translators rather than relying on input tolerance.
Can M74HC32B1R be used in place of M74HC32M1R (SOP-14)?
Yes - both share identical logic function, DC/AC specifications, and pin numbering. The only difference is package: M74HC32B1R is DIP-14 (through-hole), while M74HC32M1R is SO-14 (surface-mount). PCB layout and thermal management differ, but electrical behavior and timing are fully interchangeable in functional design.
M74HC32B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- 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:
- 13ns @ 6V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-DIP
M74HC32B1R FAQ
1.How can I place an order for M74HC32B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC32B1R 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 M74HC32B1R reliable?
The price and inventory of M74HC32B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC32B1R is usually 5 days.
3.What payment methods are accepted for M74HC32B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC32B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC32B1R?
M74HC32B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC32B1R 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 M74HC32B1R?
For technical support, including M74HC32B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC32B1R requirements.
6.How does Aetrix verify that M74HC32B1R is sourced from the original manufacturer or authorized distributors?
All M74HC32B1R 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 M74HC32B1R meets industry standards.
7.What is the process for return or replacement of M74HC32B1R?
All M74HC32B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC32B1R, 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 M74HC32B1R part is unused and in its original packaging.
Return procedure for M74HC32B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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