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onsemi DM74ALS20AMX
- Part No.:
- DM74ALS20AMX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74ALS20AMX.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,107
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Product details
Overview
DM74ALS20AMX from Fairchild Semiconductor is a dual 4-input NAND gate IC in 14-lead SOIC (M14A) package, operating at VCC = 4.5–5.5 V, with propagation delays as low as 3 ns (tPLH/tPHL), IOL = 8 mA sink capability, and guaranteed performance over 0°C to +70°C - used in TTL-compatible digital logic control and address decoding.
For engineers reviewing the DM74ALS20AMX datasheet, pinout, applications, or equivalent options, key selection considerations include its ALS-family speed-power trade-off, 50 pF load switching specification, SOIC narrow-body footprint, and functional compatibility with 74S/74LS20 devices in legacy board upgrades.
Technical Context
The DM74ALS20AMX implements two independent 4-input NAND gates using advanced oxide-isolated, ion-implanted Schottky TTL process, delivering improved AC performance over standard Schottky and low-power Schottky TTL counterparts. It operates strictly within TTL voltage thresholds: VIH ≥ 2.0 V, VIL ≤ 0.8 V, VOH ≥ VCC − 2 V, VOL ≤ 0.4 V at IOL = 4 mA.
Designed for industrial-grade reliability, it guarantees switching characteristics across full temperature (0°C to +70°C) and supply (4.5–5.5 V) ranges, with absolute maximum ratings including 7 V supply and input voltage limits. Its logic function Y = ABCD is fully defined in the truth table with no undefined states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures compatibility with standard 5 V TTL power rails and noise margin stability |
| tPLH / tPHL | 3 ns (min) to 11 ns (max) - enables high-speed combinational logic in address decoders and state machines |
| IOL | 8 mA - supports direct drive of multiple TTL inputs or small LED loads without buffering |
| VIH / VIL | 2.0 V / 0.8 V - defines unambiguous TTL logic level recognition under worst-case noise and fanout |
| Operating Temp | 0°C to +70°C - qualifies for commercial and industrial ambient environments, not extended or automotive |
| ICC (Outputs HIGH) | 0.22–0.4 mA - reflects low quiescent power typical of ALS family vs. standard TTL |
| Package | SOIC-14, JEDEC MS-012, 0.150" narrow body - surface-mount compatible with standard reflow profiles |
Pinout & Package
DM74ALS20AMX uses a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body (Package Number M14A), with standard pin spacing and thermal resistance θJA = 116.0°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 | Input A–D of Gate 1 | Four independent logic inputs for first NAND gate; all must be HIGH to yield LOW output |
| 6 | Output Y1 | Active-low output of Gate 1; sinks up to 8 mA, drives TTL-compatible loads |
| 8, 9, 12, 13 | Input A–D of Gate 2 | Four independent logic inputs for second NAND gate; electrically isolated from Gate 1 |
| 11 | Output Y2 | Active-low output of Gate 2; identical electrical specs to Y1, share same VCC/GND |
| 7 | GND | Ground reference for both gates; required for proper biasing and noise immunity |
| 14 | VCC | +5 V supply rail; powers both gates; bypass capacitor recommended near this pin |
Key Features
| Feature | Design Value |
|---|---|
| ALS process technology | Oxide-isolated, ion-implanted Schottky TTL - delivers faster switching than LS while consuming less power than S-series |
| Guaranteed 50 pF switching | Specified tPLH/tPHL tested at RL = 500 Ω, CL = 50 pF - ensures predictable timing in real PCB trace loads |
| Full temp/VCC range spec | All AC/DC parameters guaranteed from 0°C to +70°C and VCC = 4.5–5.5 V - eliminates derating in commercial systems |
| Pin-for-pin compatibility | Matches 74S20 and 74LS20 footprints and logic behavior - enables drop-in replacement in existing designs |
| TTL input/output levels | VIH = 2.0 V, VOL = 0.4 V @ IOL = 4 mA - ensures interoperability with legacy 74xx TTL families without level shifting |
Applications
| Memory Address Decoding | Industrial Control Logic |
|---|---|
Use Scenario: Selecting RAM/ROM chips in microcontroller-based data acquisition systems with 16-bit address buses. IC Role / Device Role / Timing Role: Dual 4-input NAND gate performing active-low chip select generation from upper address bits. Use Value: Propagation delay ≤11 ns ensures setup/hold timing compliance with 10 MHz bus cycles and eliminates race conditions. | Use Scenario: Implementing safety interlock logic in PLC I/O modules where redundant input validation is required. IC Role / Device Role / Timing Role: Performing AND-NOT logic on four sensor inputs to assert a hardware shutdown signal. Use Value: 8 mA output drive directly interfaces with optocoupler inputs or relay drivers without external transistors. |
| Legacy System Repair | Test Equipment Signal Gating |
Use Scenario: Replacing obsolete 74S20 or 74LS20 in vintage test instrumentation requiring TTL-level compatibility. IC Role / Device Role / Timing Role: Drop-in logic gate maintaining original timing margins and fanout capability. Use Value: Pin-for-pin and functionally identical behavior allows repair without PCB modification or firmware update. | Use Scenario: Enabling/disabling analog signal paths in automated calibration fixtures using digital control lines. IC Role / Device Role / Timing Role: Gating clock or enable signals with precise edge alignment via dual independent gates. Use Value: Matched propagation delays between gates (≤1 ns skew) preserve signal integrity in synchronous gating applications. |
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 |
|---|---|---|---|
| SN74ALS20AN | Same ALS process, identical AC/DC specs, but in PDIP-14 (N14A) package | Through-hole mounting only; higher θJA (86.5°C/W) but easier prototyping and socketing | Select when manual assembly, breadboarding, or legacy through-hole PCBs require replacement |
| 74F20PC | Fast TTL family: lower tPLH/tPHL (≈2.5 ns), higher ICC (≈15 mA), VIH = 2.0 V same, but VOL = 0.5 V @ IOL = 20 mA | Higher speed and drive, but increased power and reduced noise margin; not drop-in due to different DC loading | Select when timing-critical paths demand sub-3 ns delay and system can accommodate higher supply current |
Compared with SN74ALS20AN and 74F20PC, the DM74ALS20AMX offers optimal balance of speed (3–11 ns), power (0.4 mA quiescent), and SOIC surface-mount compatibility - making it preferred for space-constrained, medium-speed industrial control boards where thermal and layout efficiency matter.
Availability
DM74ALS20AMX is available at Aetrix Electronics and suitable for memory address decoding, industrial control logic, legacy system repair, and test equipment signal gating requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS20AMX 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and discrete power products, acquired by ON Semiconductor in 2016; known for robust TTL, MOSFET, and optoelectronic portfolios.
The DM74ALS20AMX belongs to Fairchild's Advanced Low-Power Schottky (ALS) TTL logic family, engineered for high-speed digital systems needing better performance than LS with lower power than S-series - especially in commercial and industrial control applications.
FAQ
What is the logic function implemented by each gate in the DM74ALS20AMX?
Each gate in the DM74ALS20AMX performs the 4-input NAND function: Y = NOT(A AND B AND C AND D). The device contains two completely independent gates, with no internal connection between them. This logic is verified in the function table provided in the official Fairchild datasheet DS006184, where output Y is LOW only when all four inputs are HIGH; all other input combinations yield HIGH output. The DM74ALS20AMX implements this behavior using oxide-isolated Schottky TTL circuitry.
Is the DM74ALS20AMX pin-compatible with the 74LS20 and 74S20?
Yes, the DM74ALS20AMX is functionally and pin-for-pin compatible with both the 74LS20 and 74S20, as explicitly stated in the "Features" section of the Fairchild DS006184 datasheet. All three devices use identical 14-pin SOIC or PDIP footprints, share the same pinout (inputs 1/2/4/5 → Y1, inputs 8/9/12/13 → Y2), and operate with standard TTL voltage thresholds. This allows direct substitution in existing designs without layout changes - confirmed for the DM74ALS20AMX variant in M14A package.
What is the maximum capacitive load the DM74ALS20AMX can drive while meeting its specified propagation delay?
The DM74ALS20AMX switching characteristics are guaranteed at CL = 50 pF, as specified in the "Switching Characteristics" table of DS006184. At this load, tPLH and tPHL are bounded between 3 ns and 11 ns under recommended conditions (VCC = 4.5–5.5 V, TA = 0°C to +70°C). Driving larger capacitances will increase delay nonlinearly and may violate timing margins; for loads >50 pF, buffer staging or lower-capacitance routing is recommended. The DM74ALS20AMX does not specify performance beyond 50 pF.
Does the DM74ALS20AMX support operation at 3.3 V supply voltage?
No, the DM74ALS20AMX is not rated for 3.3 V operation. Its recommended VCC range is strictly 4.5 V to 5.5 V, and absolute maximum supply voltage is 7 V. Operation below 4.5 V risks failure to meet VIH (2.0 V) and VOL (0.4 V) specifications, resulting in unreliable logic levels and increased propagation delay. For 3.3 V systems, consider modern CMOS alternatives like 74LVC20A; the DM74ALS20AMX requires a 5 V rail to function correctly.
What is the thermal resistance (θJA) of the DM74ALS20AMX in its SOIC package?
According to the "Absolute Maximum Ratings" table in the Fairchild DS006184 datasheet, the DM74ALS20AMX in the M14A SOIC package has a typical junction-to-ambient thermal resistance (θJA) of 116.0°C/W. This value assumes standard JEDEC 2-layer board conditions and is critical for calculating junction temperature rise under steady-state current draw. The PDIP version (DM74ALS20AN) has lower θJA (86.5°C/W) due to greater thermal mass and leadframe exposure - a key distinction when selecting the DM74ALS20AMX for thermally constrained layouts.
DM74ALS20AMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- 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:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- 400µA, 8mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DM74ALS20AMX FAQ
1.How can I place an order for DM74ALS20AMX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS20AMX 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 DM74ALS20AMX reliable?
The price and inventory of DM74ALS20AMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS20AMX is usually 5 days.
3.What payment methods are accepted for DM74ALS20AMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS20AMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS20AMX?
DM74ALS20AMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS20AMX 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 DM74ALS20AMX?
For technical support, including DM74ALS20AMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS20AMX requirements.
6.How does Aetrix verify that DM74ALS20AMX is sourced from the original manufacturer or authorized distributors?
All DM74ALS20AMX 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 DM74ALS20AMX meets industry standards.
7.What is the process for return or replacement of DM74ALS20AMX?
All DM74ALS20AMX units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS20AMX, 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 DM74ALS20AMX part is unused and in its original packaging.
Return procedure for DM74ALS20AMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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