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STMicroelectronics M74HC20B1R
- Part No.:
- M74HC20B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC20B1R.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,391
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Product details
Overview
M74HC20B1R from STMicroelectronics is a high-speed CMOS dual 4-input NAND 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 quiescent current ≤1µA at 25°C; used for combinational logic in industrial control panels and digital instrumentation signal conditioning.
For engineers reviewing the M74HC20B1R datasheet, M74HC20B1R pinout, M74HC20B1R application, or M74HC20B1R equivalent, key selection criteria include VCC range (2–6V), noise immunity (28% VCC min), output drive capability at 4.5V/6V, dual-gate independence, and DIP-14 through-hole compatibility for prototyping and legacy board replacement.
Technical Context
The M74HC20B1R implements two independent 4-input NAND gates using silicon gate C2MOS technology, with three-stage buffered output architecture that ensures stable switching and high noise immunity. Each gate features identical input thresholds (VIH = 3.15V min at VCC = 4.5V; VIL = 1.35V max), and outputs are fully rail-to-rail compatible across the full 2–6V operating range.
It supports wide temperature operation (−55°C to +125°C), exhibits balanced tPLH/tPHL propagation delays (≤20ns max at 6V), and maintains low dynamic power via CPD = 27pF - enabling predictable ICC(opr) calculation under varying input frequencies and loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 2V to 6V - supports single-supply battery-powered and mixed-voltage logic systems without level shifters |
| tPD Propagation Delay | 9ns (typ.) at VCC = 6V - enables reliable operation up to ~35MHz toggle frequency in simple combinatorial paths |
| IOL / IOH Output Drive | ±4mA min at VCC = 4.5V - sufficient to directly drive multiple 74HC inputs or small LEDs with series resistor |
| VNI Noise Immunity | 28% VCC (min) - provides robust rejection of coupled transients on PCB traces or shared power rails |
| ICC Quiescent Current | 1µA (max) at TA = 25°C - enables ultra-low static power in always-on monitoring circuits |
| Input Capacitance | 5pF (typ.) - minimizes loading on preceding drivers and preserves signal edge integrity |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
Package: Plastic DIP-14 (dual in-line package, 0.3" wide, through-hole mount). Dimensions per STMicroelectronics mechanical drawing P001A.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | 1A, 2A - Input A of Gate 1 and Gate 2 | Dedicated logic inputs; internally protected against ESD and transient overvoltage |
| 2, 10 | 1B, 2B - Input B of Gate 1 and Gate 2 | Identical electrical characteristics to Pin 1/9; no internal coupling between gates |
| 3, 11 | N.C. - Not Connected | No internal connection; must be left unconnected or tied to GND/VCC only if required by board layout |
| 4, 12 | 1C, 2C - Input C of Gate 1 and Gate 2 | Full 4-input NAND functionality per gate; all inputs equally valid and interchangeable |
| 5, 13 | 1D, 2D - Input D of Gate 1 and Gate 2 | Enables compact implementation of 4-input logic functions without external fan-in |
| 6, 8 | 1Y, 2Y - Output Y of Gate 1 and Gate 2 | Active-low open-drain–compatible outputs; capable of sourcing/sinking ≥4mA at 4.5V |
| 7 | GND - Ground Reference | Common return path for all internal circuitry; requires low-impedance connection to system ground plane |
| 14 | VCC - Positive Supply | Primary power rail; decoupling capacitor (100nF ceramic) recommended within 10mm of this pin |
Key Features
| Feature | Design Value |
|---|---|
| Symmetrical output impedance | |IOH| = IOL = 4mA (min) at VCC = 4.5V - eliminates duty cycle distortion in clock distribution or feedback paths |
| Balanced propagation delays | tPLH ≅ tPHL - ensures minimal skew between rising/falling edges for precise timing in synchronous logic |
| High noise immunity | VNIH = VNIL = 28% VCC (min) - rejects >1.2V of superimposed noise on 4.5V supply without false triggering |
| Pin/function compatibility | Fully compatible with standard 74-series 20 (e.g., 74LS20, 74F20) - allows drop-in upgrade from TTL to HC with no board change |
| Static discharge protection | All inputs equipped with integrated protection diodes - withstands ≥2kV HBM ESD without external components |
Applications
| Industrial PLC Logic Modules | Digital Panel Meter Signal Conditioning |
|---|---|
Use Scenario: Implementing enable/disable gating for analog-to-digital conversion triggers in programmable logic controllers. IC Role / Device Role / Timing Role: Dual 4-input NAND performs address decoding and strobe validation before ADC sampling. Use Value: Low propagation delay (9ns typ.) ensures tight timing alignment between control signals and sample clocks. | Use Scenario: Debouncing and synchronizing front-panel pushbutton inputs in digital multimeters and panel meters. IC Role / Device Role / Timing Role: One gate filters mechanical switch bounce; second gate combines multiple button states into a single status bus line. Use Value: High noise immunity (28% VCC) prevents spurious readings caused by EMI near high-voltage measurement circuits. |
| Legacy Equipment Repair | Test Fixture Control Logic |
Use Scenario: Replacing obsolete 74LS20 in aging test equipment where board space and pinout are fixed. IC Role / Device Role / Timing Role: Direct functional replacement for TTL NAND logic with improved noise margin and lower power. Use Value: Pin- and function-compatible with 74-series 20, eliminating redesign while cutting quiescent current by >99%. | Use Scenario: Generating pass/fail enable signals in automated production test fixtures interfacing with microcontroller GPIO. IC Role / Device Role / Timing Role: Combines sensor readiness flags and test mode bits to gate final result latching. Use Value: Wide VCC range (2–6V) allows direct interface with both 3.3V MCU I/O and 5V relay drivers without level translation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-input NAND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC20N | Same logic function, identical AC/DC specs, but TI's DIP-14 packaging uses different lead finish and slightly tighter tPD tolerance (8–11ns vs. 9–12ns) | Approved for TI-specific qualification flow; identical thermal profile and footprint | Select when sourcing from TI-authorized channels or requiring TI's QML-38534 compliance documentation |
| 74HC20D | Same die, but in SO-14 package (not DIP); 1.5mm height vs. DIP's 4.5mm; no through-hole mounting | Used in space-constrained PCBs where surface-mount assembly is mandatory | Select only if board design supports SOIC footprint and reflow soldering; not mechanically interchangeable |
Compared with SN74HC20N and 74HC20D, the M74HC20B1R uniquely offers STMicroelectronics' extended temperature rating (−55°C to +125°C), DIP-14 through-hole form factor for manual repair, and documented 1µA max ICC at 25°C - making it optimal for field-serviceable industrial hardware.
Availability
M74HC20B1R is available at Aetrix Electronics and suitable for industrial PLC logic modules, digital panel meter signal conditioning, and legacy equipment repair requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for M74HC20B1R 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 analog, digital, and mixed-signal ICs for industrial, automotive, and consumer applications.
The M74HC20B1R belongs to ST's high-speed CMOS logic family, engineered specifically for low-power, noise-immune digital control in harsh environments - emphasizing reliability, wide voltage operation, and long-term availability.
FAQ
Is M74HC20B1R compatible with 5V TTL logic inputs?
Yes - its VIH minimum is 3.15V at VCC = 4.5V and 4.2V at VCC = 6V, exceeding standard TTL VOH (2.4V min), ensuring reliable recognition of TTL-high signals. Inputs tolerate up to VCC + 0.5V, allowing safe interfacing without clamping diodes.
What is the maximum fan-out for M74HC20B1R at 5V supply?
At VCC = 5V, each output can drive ≥10 standard 74HC inputs (based on IOL = 4mA min and typical HC input current of 1µA), or up to 20 low-power HC inputs. Fan-out is limited by total capacitive load (CL ≤ 50pF recommended for specified AC performance).
Does M74HC20B1R require external pull-up resistors on unused inputs?
No - unused inputs may be tied directly to VCC or GND. Internal protection diodes and high input impedance (>10MΩ) prevent floating states; however, tying to VCC/GND is preferred over leaving open to avoid noise coupling and ensure deterministic logic levels.
Can M74HC20B1R operate reliably at 2.2V supply?
Yes - it is fully specified down to 2V, with guaranteed VIH = 1.5V and VIL = 0.5V at that rail. Propagation delay increases to ~120ns (max), but logic functionality remains intact, making it suitable for battery-powered systems with brown-out conditions.
M74HC20B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NAND Gate
- Number of Circuits:
- 2
- Number of Inputs:
- 4
- 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
M74HC20B1R FAQ
1.How can I place an order for M74HC20B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC20B1R 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 M74HC20B1R reliable?
The price and inventory of M74HC20B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC20B1R is usually 5 days.
3.What payment methods are accepted for M74HC20B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC20B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC20B1R?
M74HC20B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC20B1R 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 M74HC20B1R?
For technical support, including M74HC20B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC20B1R requirements.
6.How does Aetrix verify that M74HC20B1R is sourced from the original manufacturer or authorized distributors?
All M74HC20B1R 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 M74HC20B1R meets industry standards.
7.What is the process for return or replacement of M74HC20B1R?
All M74HC20B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC20B1R, 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 M74HC20B1R part is unused and in its original packaging.
Return procedure for M74HC20B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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