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onsemi DM74ALS38AMX
- Part No.:
- DM74ALS38AMX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74ALS38AMX.pdf
- Description:
- IC GATE NAND 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
DM74ALS38AMX from Fairchild Semiconductor is a quadruple 2-input NAND buffer IC with open-collector outputs, designed for wired-AND logic and level translation in TTL-compatible systems. It operates at VCC = 4.5–5.5 V, delivers IOL = 24 mA per output, and achieves tPHL as low as 2 ns (typ) with CL = 50 pF - enabling high-speed bus interfacing in industrial control backplanes.
For engineers reviewing the DM74ALS38AMX datasheet, pinout, applications, or equivalent options, key selection factors include its guaranteed AC performance across 0°C to +70°C, compatibility with LS-TTL logic families, and requirement for external pull-up resistors due to open-collector architecture.
Technical Context
The DM74ALS38AMX implements four independent NAND gates using advanced oxide-isolated, ion-implanted Schottky TTL process technology. Each gate features open-collector outputs requiring external pull-up resistors, supporting wired-AND configurations and mixed-voltage interface translation.
It guarantees switching specifications over full temperature (0°C to +70°C) and supply voltage (4.5 V to 5.5 V) ranges. Propagation delays are specified at RL = 500 Ω and CL = 50 pF, with tPLH ≤ 33 ns (max) and tPHL ≤ 12 ns (max), confirming suitability for 20+ MHz bus timing in legacy digital systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard TTL supply tolerances without regulation. |
| IOL (per output) | 24 mA - supports direct driving of multiple LS-TTL inputs or small-signal relays without buffering. |
| tPHL (max) | 12 ns - enables reliable operation in 20 MHz clock domains with margin for trace delay. |
| VIL / VIH | 0.8 V / 2.0 V - matches LS-TTL input thresholds for seamless integration into existing 5 V logic systems. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade industrial control and instrumentation environments. |
| Output Type | Open-collector - allows wired-AND logic, level shifting, and interface to higher-voltage buses (e.g., 12 V). |
Pinout & Package
DM74ALS38AMX is supplied in a 14-lead SOIC package (JEDEC MS-012, 0.150" narrow body, Package Number M14A), with 1.27 mm lead pitch and surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input (A/B per gate) | Eight total inputs across four NAND gates; each pair (e.g., Pin 1 & 2) forms one 2-input NAND. |
| 3, 6, 10, 13 | Open-collector output (Y) | Four independent open-collector outputs; require external pull-up for HIGH-level assertion. |
| 7 | GND | Ground reference for all logic and output stages; must be low-impedance connection. |
| 14 | VCC | Positive supply (4.5–5.5 V); decoupling capacitor (0.1 µF) required near this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Open-collector outputs | Enables wired-AND logic, mixed-voltage interfacing (e.g., 5 V logic to 12 V bus), and termination flexibility. |
| LS-TTL pin and functional compatibility | Direct replacement for 74LS38 in existing designs without PCB or firmware changes. |
| Guaranteed AC specs over full temp/VCC | Eliminates derating calculations for industrial ambient conditions (0°C to +70°C, 4.5–5.5 V). |
| Advanced Schottky TTL process | Reduces propagation delay vs. standard LS (tPHL typ 2 ns vs. 15 ns for 74LS38) while maintaining noise immunity. |
Applications
| Industrial Bus Arbitration | Legacy System Level Translation |
|---|---|
Use Scenario: Multiple microcontrollers share a common status bus, where only one asserts LOW at a time to signal readiness. IC Role / Device Role / Timing Role: DM74ALS38AMX implements wired-AND arbitration logic using open-collector outputs tied to shared pull-up. Use Value: Eliminates need for discrete diodes or additional logic; supports deterministic bus contention resolution at ≤20 MHz. | Use Scenario: A 5 V microcontroller communicates with a 12 V sensor interface board via shared control lines. IC Role / Device Role / Timing Role: DM74ALS38AMX acts as unidirectional level translator - inputs driven by 5 V MCU, outputs pulled to 12 V. Use Value: Provides robust 12 V-compatible logic levels without optocouplers or MOSFET translators. |
| LED Driver Interface | TTL-Compatible Test Fixture Logic |
Use Scenario: Driving common-anode LED arrays in automated test equipment where sink current exceeds MCU capability. IC Role / Device Role / Timing Role: DM74ALS38AMX serves as active-low LED driver - output sinks up to 24 mA per channel. Use Value: Enables direct LED control from logic signals without external transistors or current-limiting resistors on the anode side. | Use Scenario: Building a manual logic probe or test fixture that generates programmable enable/disable patterns for DUTs. IC Role / Device Role / Timing Role: DM74ALS38AMX provides combinational NAND logic for generating test strobes and gating signals. Use Value: Delivers sub-15 ns propagation delay and guaranteed timing across temperature - critical for repeatable test signal edges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NAND buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS38N | Same logic function and AC/DC specs; PDIP package (N14A) instead of SOIC (M14A). | Through-hole assembly; higher θJA (83°C/W vs. 114°C/W), less suitable for dense SMT layouts. | Select SN74ALS38N for prototyping or legacy through-hole production; DM74ALS38AMX preferred for volume SMT. |
| 74F38PC | Fast TTL variant: lower tPHL (3.5 ns max), higher IOL (20 mA), but wider VCC range (4.5–5.5 V same) and higher ICC. | Better speed/power trade-off for new designs targeting >25 MHz operation; not drop-in due to different AC characteristics. | Choose 74F38PC when propagation delay is critical and power budget allows; verify timing margins in target load. |
Compared with SN74ALS38N and 74F38PC, DM74ALS38AMX offers optimal balance of proven reliability, SOIC packaging for modern assembly, and guaranteed performance across commercial temperature - making it ideal for sustaining legacy industrial control upgrades.
Availability
DM74ALS38AMX is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system refurbishment, and test equipment design requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS38AMX 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 leading designer of analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its legacy TTL and logic families remain widely deployed in industrial infrastructure.
The DM74ALS38AMX belongs to the 74ALS (Advanced Low-Power Schottky) logic family, engineered for improved speed-power efficiency over standard LS-TTL while maintaining full compatibility with existing 5 V TTL systems.
FAQ
What is the maximum sink current per output of the DM74ALS38AMX?
The DM74ALS38AMX specifies a maximum LOW-level output current (IOL) of 24 mA per open-collector output, tested under VCC = 4.5 V and VOL = 0.5 V. This rating allows direct driving of multiple LS-TTL inputs or small-signal loads without external buffering. The DM74ALS38AMX maintains this current capability across its full operating temperature range (0°C to +70°C).
Does the DM74ALS38AMX require external pull-up resistors?
Yes, the DM74ALS38AMX requires external pull-up resistors on all four open-collector outputs to achieve defined HIGH-level logic states. The value depends on total connected load: typical design uses 1–10 kΩ for TTL fanout, calculated using IOH, IIH, and IIL totals per the manufacturer's pull-up resistor equations. Without pull-ups, outputs remain floating in HIGH state.
Is the DM74ALS38AMX pin-compatible with the 74LS38?
Yes, the DM74ALS38AMX is functionally and pin-for-pin compatible with the 74LS38, sharing identical pinout, logic function, and DC electrical characteristics. Its improved AC performance (e.g., tPHL down to 2 ns typ vs. 15 ns for 74LS38) allows direct substitution in existing 74LS38-based designs without layout or firmware changes.
What is the operating temperature range of the DM74ALS38AMX?
The DM74ALS38AMX is rated for commercial operation from 0°C to +70°C ambient temperature, matching standard TTL environmental qualification. This range is explicitly guaranteed in the Recommended Operating Conditions table and supported by all published AC/DC specifications - no derating is required within this interval.
Can the DM74ALS38AMX be used for level translation between 5 V and 12 V systems?
Yes, the DM74ALS38AMX open-collector outputs can interface 5 V logic to 12 V buses when pulled up to 12 V, provided the output transistor's breakdown voltage (7 V absolute max) is not exceeded. Since the output only sinks current, the 12 V rail connects to the pull-up resistor, not the IC. This configuration is confirmed in Fairchild's application guidance for wired-AND and level-shifting use cases.
DM74ALS38AMX 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:
- 4
- Number of Inputs:
- 2
- Features:
- Open Collector
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -, 24mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 33ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DM74ALS38AMX FAQ
1.How can I place an order for DM74ALS38AMX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS38AMX 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 DM74ALS38AMX reliable?
The price and inventory of DM74ALS38AMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS38AMX is usually 5 days.
3.What payment methods are accepted for DM74ALS38AMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS38AMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS38AMX?
DM74ALS38AMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS38AMX 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 DM74ALS38AMX?
For technical support, including DM74ALS38AMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS38AMX requirements.
6.How does Aetrix verify that DM74ALS38AMX is sourced from the original manufacturer or authorized distributors?
All DM74ALS38AMX 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 DM74ALS38AMX meets industry standards.
7.What is the process for return or replacement of DM74ALS38AMX?
All DM74ALS38AMX units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS38AMX, 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 DM74ALS38AMX part is unused and in its original packaging.
Return procedure for DM74ALS38AMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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