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onsemi DM74ALS20AN
- Part No.:
- DM74ALS20AN
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
DM74ALS20AN.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14MDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
DM74ALS20AN from Fairchild Semiconductor is a dual 4-input NAND gate IC in a 14-lead PDIP package, operating at VCC = 4.5–5.5 V, with propagation delays as low as 3 ns (tPLH/tPHL), output drive capability of −112 mA (IO), and guaranteed performance across 0°C to +70°C ambient temperature - used in TTL-based digital logic control and address decoding.
For engineers reviewing the DM74ALS20AN datasheet, pinout, applications, or equivalent options, key selection criteria include its 4-input NAND dual-gate architecture, 50 pF load switching specification, Schottky TTL compatibility, and PDIP-14 mechanical footprint for through-hole prototyping and industrial control logic boards.
Technical Context
The DM74ALS20AN implements two independent 4-input NAND gates using advanced oxide-isolated, ion-implanted Schottky TTL process technology. It delivers improved AC performance over standard Schottky and low-power Schottky TTL counterparts while maintaining functional and pin-for-pin compatibility.
Each gate accepts four TTL-compatible inputs (VIH ≥ 2 V, VIL ≤ 0.8 V) and drives standard TTL loads with VOH ≥ VCC−2 V and VOL ≤ 0.5 V at IOL = 8 mA. Propagation delay is specified under RL = 500 Ω and CL = 50 pF conditions across full VCC and temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation with standard +5 V TTL power rails and tolerates supply ripple. |
| tPLH / tPHL | 3 ns (min) to 11 ns (max) - enables high-speed combinational logic in address decoders and state-machine control paths. |
| IOL / IOH | 8 mA sink / −0.4 mA source - directly drives multiple standard TTL inputs without buffering. |
| VIL / VIH | 0.8 V / 2.0 V - provides robust noise margin against TTL-level signal degradation in noisy industrial environments. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded systems and instrumentation applications. |
| Input Clamp Voltage | −1.5 V - protects inputs from negative transients during hot insertion or ESD events. |
Pinout & Package
DM74ALS20AN is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with through-hole mounting and industry-standard lead pitch (0.100").
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5 | Gate 1 Inputs A–D | Four TTL-compatible logic inputs for first NAND gate; all must be HIGH to assert LOW output. |
| 6 | Gate 1 Output Y1 | Active-low open-collector–compatible output; sinks up to 8 mA at VOL ≤ 0.5 V. |
| 8, 9, 12, 13 | Gate 2 Inputs A–D | Four independent TTL inputs for second NAND gate; electrically isolated from Gate 1. |
| 11 | Gate 2 Output Y2 | Dedicated output for second gate; supports parallel logic expansion without crosstalk. |
| 7 | GND | Ground reference for both gates; required for proper biasing and noise immunity. |
| 14 | VCC | +5 V supply input; powers both gates simultaneously with shared rail decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced Schottky TTL Process | Oxide-isolated, ion-implanted fabrication enables lower power-delay product vs. standard TTL. |
| Full Temperature & Voltage Spec | Switching and DC parameters guaranteed from 0°C to +70°C and VCC = 4.5–5.5 V - no derating needed. |
| Pin-for-Pin Compatibility | Direct replacement for 74S20 and 74LS20 in existing PDIP-14 layouts without PCB modification. |
| 50 pF Load Switching Spec | Propagation delay validated at realistic capacitive loading - reflects real-world board trace and fanout conditions. |
Applications
| Industrial Control Logic | Memory Address Decoding |
|---|---|
Use Scenario: Discrete logic layer in PLC I/O modules performing safety interlock validation and enable gating. IC Role / Device Role / Timing Role: Dual 4-input NAND gate implementing AND-NOT logic for multi-signal arbitration before actuator activation. Use Value: Guaranteed 3 ns minimum propagation delay ensures deterministic response within 10 µs control cycles under full temperature range. | Use Scenario: Chip-select generation in 8-bit microcontroller systems with 64 KB address space and multiple peripherals. IC Role / Device Role / Timing Role: Combining upper address bits (A14–A15) and control signals (RD/WR) to generate peripheral-specific chip enables. Use Value: 8 mA output sink current directly drives multiple 74-series address latch inputs without added buffers. |
| Test Equipment Signal Gating | Legacy System Repair & Replacement |
Use Scenario: Input conditioning stage in automated test fixtures where stimulus signals require synchronized enable/disable control. IC Role / Device Role / Timing Role: Enabling/disabling analog multiplexer control lines based on pattern generator outputs and pass/fail status. Use Value: −1.5 V input clamp voltage prevents damage from transient coupling during high-speed relay switching. | Use Scenario: Drop-in replacement for obsolete 74S20 or 74LS20 in field-repair of vintage telecom switching cards and lab instruments. IC Role / Device Role / Timing Role: Functional and pin-compatible TTL NAND gate preserving original timing and loading behavior. Use Value: Identical N14A PDIP footprint and 0.300" width allows reuse of existing solder pads and socket footprints. |
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 |
|---|---|---|---|
| SN74ALS20N | Same ALS family, identical electrical specs and pinout; manufactured by Texas Instruments. | No functional difference; validated in same legacy designs requiring ALS-speed NAND logic. | Select when TI-sourced supply chain alignment or dual-sourcing is required. |
| DM74LS20N | Lower speed (15 ns max tPD), higher ICC (1.6–4.5 mA), same PDIP-14 package and pinout. | Suitable only where <10 MHz clock domains or relaxed timing margins exist. | Choose for cost-sensitive, non-critical timing applications where ALS performance is not required. |
Compared with SN74ALS20N and DM74LS20N, the DM74ALS20AN offers identical timing and drive strength to the TI variant but improves on LS-series speed and power - making it optimal for timing-critical legacy upgrades where pin compatibility and proven reliability are mandatory.
Availability
DM74ALS20AN is available at Aetrix Electronics and suitable for industrial control logic, memory address decoding, test equipment signal gating, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS20AN 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 designer and manufacturer of analog and discrete semiconductors, acquired by ON Semiconductor in 2016.
The DM74ALS20AN belongs to the 74ALS (Advanced Low-Power Schottky) logic family, engineered for high-speed, low-power TTL-compatible digital systems requiring improved AC performance over earlier 74S and 74LS generations.
FAQ
What is the maximum propagation delay of the DM74ALS20AN at 5 V supply?
The DM74ALS20AN has a maximum propagation delay of 11 ns for LOW-to-HIGH (tPLH) and 10 ns for HIGH-to-LOW (tPHL) transitions, measured under RL = 500 Ω and CL = 50 pF at VCC = 4.5–5.5 V and TA = 0°C to +70°C. These values are guaranteed across the full operating range, not just typical conditions. The DM74ALS20AN maintains this performance without derating.
Is the DM74ALS20AN compatible with standard TTL input and output levels?
Yes, the DM74ALS20AN is fully TTL-compatible: VIH = 2.0 V (min), VIL = 0.8 V (max), VOH ≥ VCC−2 V, and VOL ≤ 0.5 V at IOL = 8 mA. Its input thresholds and output swing match standard TTL specifications, allowing direct interfacing with 74LS, 74S, and other TTL-family devices. This compatibility is confirmed in the DM74ALS20AN datasheet's Electrical Characteristics table.
Does the DM74ALS20AN support operation at 4.5 V supply voltage?
Yes, the DM74ALS20AN is fully specified down to VCC = 4.5 V, with all DC and switching parameters guaranteed across 4.5–5.5 V. At 4.5 V, VOH remains ≥ 2.5 V (VCC−2), VOL ≤ 0.4 V (at IOL = 4 mA), and tPLH/tPHL stay within 3–11 ns. This makes the DM74ALS20AN suitable for systems with marginal +5 V regulation or battery-backed operation where voltage may dip.
What is the thermal resistance (θJA) of the DM74ALS20AN in its PDIP package?
Per the DM74ALS20AN datasheet, the junction-to-ambient thermal resistance (θJA) for the N14A PDIP package is 86.5°C/W. This value assumes standard JEDEC test conditions (single-layer board, 1 in² copper pad). It enables thermal design margin estimation: at 1.7 mA ICC (outputs LOW) and 5.5 V, power dissipation is ~9.4 mW, resulting in <1°C junction rise above ambient - well within safe operating limits.
Can the DM74ALS20AN replace a 74S20 in an existing design?
Yes, the DM74ALS20AN is explicitly stated as functionally and pin-for-pin compatible with 74S20 and 74LS20. It uses the same N14A PDIP package, identical pinout, and meets or exceeds S-series speed (3 ns min vs. 4 ns min for 74S20) while consuming less power. No layout changes or signal integrity revalidation are required when substituting DM74ALS20AN for 74S20 in legacy designs.
DM74ALS20AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- 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:
- 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:
- Through Hole
- Supplier Device Package:
- 14-MDIP
DM74ALS20AN FAQ
1.How can I place an order for DM74ALS20AN through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS20AN 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 DM74ALS20AN reliable?
The price and inventory of DM74ALS20AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS20AN is usually 5 days.
3.What payment methods are accepted for DM74ALS20AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS20AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS20AN?
DM74ALS20AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS20AN 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 DM74ALS20AN?
For technical support, including DM74ALS20AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS20AN requirements.
6.How does Aetrix verify that DM74ALS20AN is sourced from the original manufacturer or authorized distributors?
All DM74ALS20AN 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 DM74ALS20AN meets industry standards.
7.What is the process for return or replacement of DM74ALS20AN?
All DM74ALS20AN units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS20AN, 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 DM74ALS20AN part is unused and in its original packaging.
Return procedure for DM74ALS20AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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