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Texas Instruments SN74AS20DRG4
- Part No.:
- SN74AS20DRG4
- Manufacturer:
- Texas Instruments
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74AS20DRG4.pdf
- Description:
- IC GATE NAND 2CH 4-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
SN74AS20DRG4 from Texas Instruments is a dual 4-input positive-NAND gate logic IC operating at 4.5–5.5 V, delivering 20 mA low-level output drive and 5 ns typical propagation delay (tPLH/tPHL) at 50 pF load. It performs Boolean Y = A • B • C • D in positive logic and is rated for 0°C to 70°C industrial operation. It serves as a high-speed combinational logic building block in digital control and interface circuitry.
For engineers reviewing the SN74AS20DRG4 datasheet, SN74AS20DRG4 pinout, SN74AS20DRG4 application, or SN74AS20DRG4 equivalent, this page provides verified functional identity, validated SOIC-14 package mapping, confirmed timing and drive specifications, and two technically documented alternative parts for logic-level compatibility assessment.
Technical Context
The SN74AS20DRG4 implements two independent TTL-compatible NAND gates with totem-pole outputs-no 3-state or open-collector functionality. Its AS (Advanced Schottky) process delivers faster switching than ALS variants, with tPLH/tPHL ≤ 5 ns under 50 pF/500 Ω conditions.
It requires a single 5 V supply (4.5–5.5 V), accepts standard TTL input thresholds (VIH = 2 V, VIL = 0.8 V), and sinks up to 20 mA per output while sourcing −2 mA. Input clamp voltage (VIK = −1.2 V) and output saturation (VOL = 0.5 V at IOL = 20 mA) are specified across the full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Dual 4-input positive-NAND: Y = A•B•C•D (positive logic) |
| Propagation Delay | ≤ 5 ns (tPLH/tPHL, VCC = 5 V, CL = 50 pF, RL = 500 Ω) |
| Output Drive | Sinks 20 mA (IOL), sources −2 mA (IOH) - sufficient for direct TTL fanout or LED driving |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V digital rails, not 3.3 V tolerant |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments |
| Input Thresholds | VIH = 2.0 V (min), VIL = 0.8 V (max) - matches standard TTL logic levels |
| Package | SOIC-14 (D package), 3.90 mm body width, 1.75 mm max height - surface-mount compatible |
Pinout & Package
SN74AS20DRG4 is housed in a 14-pin plastic small-outline integrated circuit (SOIC-D) package, pin-compatible with industry-standard 14-pin DIP and SOIC footprints. The device has no internal connections on pins 3 and 11 (NC).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A, 1B, 1C, 1D | Gate 1 inputs | Four logic inputs for first NAND gate; all must be HIGH to pull 1Y LOW |
| 1Y | Gate 1 output | Active-low NAND output; drives loads directly without external pull-up |
| 2A, 2B, 2C, 2D | Gate 2 inputs | Four logic inputs for second independent NAND gate |
| 2Y | Gate 2 output | Independent active-low output; electrically isolated from 1Y |
| VCC (Pin 14) | Power supply | Positive supply terminal; must be decoupled locally with 0.1 µF ceramic capacitor |
| GND (Pin 7) | Ground reference | Return path for all inputs, outputs, and internal logic; shared with system ground plane |
| Pins 3, 11 | No connect | Unbonded die pads; must remain unconnected on PCB - no routing or stitching |
Key Features
| Feature | Design Value |
|---|---|
| High-speed AS logic | 5 ns typical propagation delay enables use in >100 MHz clock-domain glue logic |
| TTL-compatible interface | Accepts standard 0.8 V / 2.0 V input thresholds and drives 20 mA loads - interoperable with legacy 74-series systems |
| Low power consumption | ICCL = 8.7 mA max at VCC = 5.5 V - lower dynamic current than original 74S family |
| Robust input clamping | VIK = −1.2 V supports safe handling of transient negative spikes on inputs |
| SOIC-14 packaging | Industry-standard footprint with 1.27 mm pitch - compatible with automated SMT assembly and IPC-7351 land patterns |
Applications
| Industrial Control Logic | Digital Signal Conditioning |
|---|---|
|
Use Scenario: Combining status signals from multiple sensors (e.g., limit switches, pressure thresholds) before enabling a motor driver or safety interlock. IC Role / Device Role / Timing Role: Dual NAND gate performing wired-AND logic reduction and noise-immune signal validation prior to microcontroller input or relay activation. Use Value: Eliminates need for discrete diode-OR networks or additional MCU GPIOs; 5 ns delay ensures real-time response within PLC scan cycles. |
Use Scenario: Converting asynchronous pushbutton inputs into clean, debounced enable pulses for clocked registers or state machines. IC Role / Device Role / Timing Role: NAND-based SR latch or edge-triggered synchronizer stage, leveraging fast propagation to suppress contact bounce artifacts. Use Value: Achieves sub-10 ns setup/hold margin against 10 MHz system clocks without external RC filtering or firmware debouncing overhead. |
| Legacy System Interface | Test Equipment Signal Gating |
|
Use Scenario: Adapting between modern FPGA I/O banks and legacy backplane buses requiring strict TTL voltage levels and fanout capability. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for address/data strobes in retro-computing or instrumentation chassis. Use Value: Matches 74LS/74S timing envelopes and drive strength - avoids timing violations when interfacing with vintage ASICs or PROMs. |
Use Scenario: Enabling precise pulse-width control in automated test fixtures by gating high-frequency clock signals with programmable control lines. IC Role / Device Role / Timing Role: High-speed enable/disable gate for 10–50 MHz clock distribution paths during parametric testing sequences. Use Value: 5 ns propagation + 0.5 V VOL at 20 mA ensures minimal jitter injection and reliable low-state termination into 50 Ω loads. |
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 |
|---|---|---|---|
| SN74ALS20ADR | Slower (11 ns max tPLH), lower IOL (8 mA), lower ICCL (1.5 mA) | Lower power, less drive - suitable where speed < 20 MHz and fanout ≤ 10 | Prefer SN74ALS20ADR only if thermal budget or static power is critical and timing margin allows ≥2× delay penalty. |
| SN74F20N | F-family: 8 ns max tPLH, 12 mA IOL, higher ICCL (12 mA), PDIP-only packaging | Higher power, through-hole only - fits legacy board rework but lacks SOIC option | Choose SN74F20N only for through-hole prototyping or replacement in existing DIP-based designs where SOIC is not feasible. |
Compared with SN74ALS20ADR and SN74F20N, the SN74AS20DRG4 uniquely balances sub-5 ns speed, 20 mA drive, and SOIC-14 surface-mount compatibility - making it the optimal choice for new industrial control boards requiring both performance and manufacturability.
Availability
SN74AS20DRG4 is available at Aetrix Electronics and suitable for industrial control logic, digital signal conditioning, legacy system interface, and test equipment signal gating requiring stable component supply and long-term production continuity.
Supply support for SN74AS20DRG4 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
Texas Instruments is a global semiconductor leader founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74AS20DRG4 belongs to TI's 74AS logic family - engineered for high-speed, TTL-compatible digital interfacing in commercial-temperature applications where propagation delay and output drive outweigh ultra-low-power requirements.
FAQ
What logic function does the SN74AS20DRG4 implement?
The SN74AS20DRG4 implements two independent 4-input positive-NAND gates, performing Y = A • B • C • D in positive logic. Each gate outputs LOW only when all four inputs are HIGH; otherwise, the output is HIGH. This Boolean behavior is defined in the device's function table and confirmed across all operating conditions in the SDAS192B datasheet.
Is SN74AS20DRG4 compatible with 3.3 V logic systems?
No, SN74AS20DRG4 is not 3.3 V compatible. It requires a 4.5–5.5 V supply and uses TTL input thresholds (VIH = 2.0 V min, VIL = 0.8 V max). Driving its inputs from 3.3 V logic may result in marginal or undefined switching, and powering it at 3.3 V violates absolute maximum ratings. Use level translators or 5 V–tolerant I/O buffers when interfacing with 3.3 V systems.
What is the maximum capacitive load the SN74AS20DRG4 can drive reliably?
The SN74AS20DRG4 is characterized for CL = 50 pF in its switching specifications, with tPLH/tPHL guaranteed ≤ 5 ns under those conditions. While it can drive heavier loads, propagation delay increases linearly with capacitance, and output rise/fall times degrade. For loads > 50 pF, verify timing margins in-system or add a dedicated buffer stage - the SN74AS20DRG4 itself is not rated beyond 50 pF in official specifications.
Are pins 3 and 11 on SN74AS20DRG4 required to be grounded or left floating?
Pins 3 and 11 on SN74AS20DRG4 are No Connect (NC) terminals with no internal bond wire or silicon connection. They must be left unconnected - neither grounded nor tied to VCC. Routing traces to these pins or placing solder paste on them risks unintended shorts or assembly defects. The datasheet explicitly states "NC − No internal connection" for both pins.
Does SN74AS20DRG4 support 3-state or open-collector outputs?
No, SN74AS20DRG4 does not support 3-state or open-collector outputs. It features standard totem-pole (push-pull) outputs capable of actively driving HIGH and LOW. There is no output-enable (OE) pin, and the device cannot enter a high-impedance state. For bus-sharing or wired-OR applications, external pull-up resistors or discrete transistors are required - the SN74AS20DRG4 itself provides only active-drive logic outputs.
SN74AS20DRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AS
- 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:
- 2mA, 20mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 5ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
SN74AS20DRG4 FAQ
1.How can I place an order for SN74AS20DRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AS20DRG4 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 SN74AS20DRG4 reliable?
The price and inventory of SN74AS20DRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AS20DRG4 is usually 5 days.
3.What payment methods are accepted for SN74AS20DRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AS20DRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74AS20DRG4?
SN74AS20DRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AS20DRG4 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 SN74AS20DRG4?
For technical support, including SN74AS20DRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AS20DRG4 requirements.
6.How does Aetrix verify that SN74AS20DRG4 is sourced from the original manufacturer or authorized distributors?
All SN74AS20DRG4 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 SN74AS20DRG4 meets industry standards.
7.What is the process for return or replacement of SN74AS20DRG4?
All SN74AS20DRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AS20DRG4, 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 SN74AS20DRG4 part is unused and in its original packaging.
Return procedure for SN74AS20DRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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