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STMicroelectronics 74AC20MTR
- Part No.:
- 74AC20MTR
- Manufacturer:
- STMicroelectronics
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74AC20MTR.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,440
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Product details
Overview
74AC20MTR from STMicroelectronics is a dual 4-input NAND gate in advanced CMOS technology, operating from 2V to 6V supply, with 4ns typical propagation delay at 5V, ±24mA symmetrical output drive, and 2µA max quiescent current at 25°C - used in high-speed digital logic interfacing, address decoding, and control signal conditioning in industrial PLCs and instrumentation.
For engineers reviewing the 74AC20MTR datasheet, 74AC20MTR pinout, 74AC20MTR application, or 74AC20MTR equivalent, key selection criteria include transmission-line driving capability (50Ω), latch-up immunity, ESD tolerance (2kV), noise margin (28% VCC), and compatibility with legacy 74-series logic families.
Technical Context
The device implements two independent 4-input NAND gates using sub-micron C2MOS process with three-stage buffered output architecture, enabling balanced tPLH/tPHL delays and stable switching under capacitive loads. Input and output stages integrate protection diodes for ±20mA DC diode current rating and transient voltage suppression.
It supports incident-wave switching on 50Ω transmission lines and maintains symmetrical |IOH| = |IOL| ≥ 24mA across –55°C to +125°C, with VIH/VIL thresholds defined at 30%/70% of VCC for robust noise immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - enables interoperability with 3.3V and 5V logic domains without level shifters |
| tPD (Typ.) | 4ns at VCC = 5V - supports >100MHz toggle rates in combinatorial logic paths |
| IOL / IOH | ≥24mA - drives standard 50Ω transmission lines directly without external buffers |
| VNIH / VNIL | 28% VCC min - ensures reliable operation under high-noise industrial environments |
| ICC (Max) | 2µA at TA = 25°C - suitable for low-power standby modes in battery-backed systems |
| ESD Rating | 2kV HBM - protects against handling-induced discharge during board assembly and field service |
| Operating Temp | –55°C to +125°C - qualified for extended-temperature industrial and automotive under-hood applications |
Pinout & Package
TSSOP-14 package: 4.9 × 6.4 mm body, 0.65 mm pitch, 1.1 mm height, gull-wing leads, moisture sensitivity level 1 (MSL1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 | 1A, 2A - Input A of Gate 1 & Gate 2 | Dedicated logic inputs; accept 0–VCC voltage range, tolerate 2kV ESD |
| 2, 10 | 1B, 2B - Input B of Gate 1 & Gate 2 | Identical electrical behavior to Pin 1/9; no internal connection between gates |
| 3, 11 | N.C. - Not Connected | Internally unconnected; must be left floating or tied to GND/VCC per layout best practice |
| 4, 12 | 1C, 2C - Input C of Gate 1 & Gate 2 | Supports full 4-input NAND truth table; VIH/VIL thresholds track VCC proportionally |
| 5, 13 | 1D, 2D - Input D of Gate 1 & Gate 2 | Final input per gate; enables compact implementation of 4-input logic functions |
| 6, 8 | 1Y, 2Y - Output Y of Gate 1 & Gate 2 | Active-low open-drain compatible outputs; drive 50Ω lines with <11ns max skew |
| 7 | GND | Ground reference for all I/O and internal circuitry; requires low-inductance PCB return path |
| 14 | VCC | Positive supply rail; bypassing with 100nF ceramic capacitor near pin recommended |
Key Features
| Feature | Design Value |
|---|---|
| Pin- and function-compatible with 74LS20/74HC20 | Direct drop-in replacement for legacy TTL and HC logic without redesign |
| 50Ω transmission line driving | Eliminates need for series termination resistors in high-speed routing |
| Balanced tPLH ≅ tPHL | Reduces duty cycle distortion in clocked logic and synchronous state machines |
| Improved latch-up immunity | Enables reliable operation in noisy power environments with fast transients |
| 2kV HBM ESD protection on all pins | Meets IEC 61000-4-2 Level 2 requirements without external TVS devices |
Applications
| Industrial Control Logic | Automotive Body Controller |
|---|---|
Use Scenario: Address decoding and enable gating in modular I/O backplanes with distributed 5V/3.3V supplies. IC Role / Device Role / Timing Role: Dual 4-input NAND performs active-low chip select generation and bus arbitration logic. Use Value: 4ns propagation delay ensures setup/hold timing margins for 25MHz parallel bus interfaces. | Use Scenario: Door lock actuation sequencing and mirror position validation in centralized body control modules. IC Role / Device Role / Timing Role: Combinatorial logic element implementing safety interlock conditions before motor driver activation. Use Value: –55°C to +125°C rating guarantees functional integrity across full vehicle thermal envelope. |
| Test Equipment Signal Conditioning | Medical Diagnostic Interface |
Use Scenario: Pulse shaping and signal inversion in automated test equipment (ATE) pattern generators. IC Role / Device Role / Timing Role: High-fidelity logic gate preserving edge integrity on 50Ω coaxial traces up to 100MHz. Use Value: Symmetrical 24mA drive eliminates rise/fall time mismatch in critical timing paths. | Use Scenario: Isolated control signal translation between microcontroller GPIO and isolated sensor interface ICs. IC Role / Device Role / Timing Role: Level-shifting NAND gate enabling 3.3V MCU to drive 5V logic in analog front-end subsystems. Use Value: 2V–6V VCC range allows direct operation from regulated 3.3V or 5V rails without external regulators. |
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 |
|---|---|---|---|
| 74HC20PW,118 (Nexperia) | Slower tPD (15ns typ. at 4.5V); lower drive (±5.2mA); 2V–6V VCC | Not suitable for >25MHz logic paths or 50Ω line driving | Prefer where cost sensitivity outweighs speed/power trade-offs |
| SN74AC20N (Texas Instruments) | Same AC specs; DIP-14 only; no TSSOP option; identical pinout | Requires through-hole assembly; incompatible with fine-pitch SMT production | Select when legacy DIP prototyping or repair is required |
Compared with 74HC20PW and SN74AC20N, the 74AC20MTR uniquely combines TSSOP-14 miniaturization, 4ns speed, and 24mA drive - making it optimal for space-constrained, high-speed industrial control boards requiring surface-mount scalability.
Availability
74AC20MTR is available at Aetrix Electronics and suitable for industrial control logic, automotive body controllers, test equipment signal conditioning, and medical diagnostic interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74AC20MTR 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 industrial, automotive, and consumer markets.
The 74AC logic family targets high-speed, low-power, and robust industrial-grade digital interfacing - emphasizing noise immunity, wide supply range, and enhanced reliability over standard HC/HCT variants.
FAQ
Is 74AC20MTR pin-compatible with 74LS20?
Yes - 74AC20MTR uses identical pin numbering and logic function mapping as 74LS20, including dual 4-input NAND configuration and shared VCC/GND positions. However, its CMOS input structure draws negligible current versus LS TTL's base-current loading, eliminating fan-out limitations and reducing PCB-level loading effects.
Can 74AC20MTR operate reliably at 3.3V supply?
Yes - the device is fully specified from 2V to 6V, with guaranteed VIH ≥ 2.1V and VIL ≤ 1.5V at VCC = 3.3V, and tPD ≤ 8.5ns (max) under CL = 50pF. Its 28% VCC noise margin ensures robustness against ground bounce and supply ripple in mixed-voltage systems.
What is the significance of "N.C." pins 3 and 11?
Pins 3 and 11 are internally not connected - they serve no electrical function and must not be bonded or wired in the die. In PCB layout, they may be left unconnected, tied to GND for mechanical stability, or routed as unused vias; no current flows through them under any operating condition.
Does 74AC20MTR require external decoupling capacitors?
Yes - STMicroelectronics recommends placing a 100nF ceramic capacitor between VCC (Pin 14) and GND (Pin 7) within 5mm of the package. This suppresses high-frequency supply noise generated by simultaneous switching outputs and maintains stable internal node voltages during fast transitions.
74AC20MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74AC
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- NAND Gate
- Number of Circuits:
- 2
- Number of Inputs:
- 4
- Features:
- -
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Max):
- 2 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.9V ~ 1.65V
- Input Logic Level - High:
- 2.1V ~ 3.85V
- Max Propagation Delay @ V, Max CL:
- 7ns @ 5V, 50pF
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SO
74AC20MTR FAQ
1.How can I place an order for 74AC20MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74AC20MTR 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 74AC20MTR reliable?
The price and inventory of 74AC20MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74AC20MTR is usually 5 days.
3.What payment methods are accepted for 74AC20MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74AC20MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74AC20MTR?
74AC20MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74AC20MTR 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 74AC20MTR?
For technical support, including 74AC20MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74AC20MTR requirements.
6.How does Aetrix verify that 74AC20MTR is sourced from the original manufacturer or authorized distributors?
All 74AC20MTR 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 74AC20MTR meets industry standards.
7.What is the process for return or replacement of 74AC20MTR?
All 74AC20MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74AC20MTR, 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 74AC20MTR part is unused and in its original packaging.
Return procedure for 74AC20MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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