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onsemi DM74ALS03BM
- Part No.:
- DM74ALS03BM
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74ALS03BM.pdf
- Description:
- IC GATE NAND 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
DM74ALS03BM from Fairchild Semiconductor is a quad 2-input NAND gate 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 = 8 mA sink capability, features tPLH/tPHL = 3–50 ns propagation delays (CL = 50 pF), and is rated for 0°C to +70°C industrial temperature range.
For engineers reviewing the DM74ALS03BM datasheet, pinout, applications, or equivalent options, key selection considerations include open-collector drive strength, guaranteed AC performance across full VCC/temperature, compatibility with legacy Schottky TTL bus structures, and SOIC-14 thermal characteristics (θJA = 116.0°C/W).
Technical Context
This device implements four independent NAND gates using advanced oxide-isolated, ion-implanted Schottky TTL process technology. Each output is open-collector, requiring external pull-up resistors - enabling wired-AND configuration, voltage-level shifting, and interface with higher-voltage logic families.
Switching specifications are guaranteed over full recommended operating conditions (VCC = 4.5–5.5 V, TA = 0–70°C) and tested at CL = 50 pF. The DM74ALS03BM is functionally and pin-for-pin compatible with standard Schottky (74S03) and low-power Schottky (74LS03) TTL counterparts, supporting drop-in replacement in existing designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard TTL supply tolerance. |
| IOL (Max) | 8 mA - supports driving multiple TTL inputs or moderate-current loads via external pull-up. |
| tPLH / tPHL | 3 ns (min) to 50 ns (max) - defines timing window for synchronous bus interfacing at 20 MHz worst-case. |
| VOH (Min) | 5.5 V - allows safe interface with 5 V CMOS or higher-voltage logic when pulled up externally. |
| VIH / VIL | 2.0 V / 0.8 V - matches standard TTL input thresholds for reliable signal recognition. |
| θJA | 116.0°C/W - indicates thermal resistance of SOIC-14 package, critical for power dissipation planning. |
| Operating Temp | 0°C to +70°C - qualifies for commercial/industrial ambient environments without derating. |
Pinout & Package
DM74ALS03BM is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150" narrow body (Package Number M14A). Thermal resistance θJA = 116.0°C/W reflects its surface-mount thermal profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 12, 13 | Input (A/B per gate) | Eight total inputs across four NAND gates; each pair (e.g., pins 1&2) forms one gate's A/B inputs. |
| 3, 6, 10, 11 | Open-collector Output (Y) | Four independent open-collector outputs - require external pull-up for HIGH assertion and enable wired-AND logic. |
| 7 | GND | Ground reference for all logic and power paths; must be low-impedance connection. |
| 14 | VCC | Positive supply rail (4.5–5.5 V); decoupling capacitor required near pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Open-collector outputs | Enable wired-AND bus architectures and level translation between 5 V TTL and higher-voltage logic families. |
| Guaranteed AC specs over full VCC/temp | Ensures consistent timing behavior in unregulated supplies or variable-temperature enclosures without revalidation. |
| Advanced Schottky TTL process | Delivers improved speed-power trade-off vs. standard 74S/74LS, with lower ICC (0.43–3 mA) under static conditions. |
| Pin-for-pin compatibility | Direct replacement for 74S03 and 74LS03 in existing PCB layouts - no redesign needed for upgrade path. |
| 50 pF switching test load | Validates performance under typical PCB trace + input capacitance loading, aligning with real-world routing conditions. |
Applications
| Industrial Bus Interface | Legacy System Logic Expansion |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to 12 V relay driver arrays in factory automation PLC modules. IC Role / Device Role / Timing Role: Level-shifting NAND gate providing inverted control signals with current-sinking capability for optocoupler inputs. Use Value: Open-collector outputs allow direct connection to 12 V pull-ups, eliminating level-shifters while maintaining TTL-compatible input thresholds. | Use Scenario: Adding active-low enable logic to memory-mapped peripheral select decoding in retro-computing hardware. IC Role / Device Role / Timing Role: Quad NAND used as combinational logic element for address decoding and chip-select generation. Use Value: Guaranteed 3–50 ns propagation delay ensures setup/hold timing compliance with 8-bit CPU buses running ≤20 MHz. |
| Wired-AND Interrupt Bus | TTL-Compatible Sensor Aggregation |
Use Scenario: Consolidating interrupt requests from multiple sensors onto a shared MCU interrupt line in embedded instrumentation. IC Role / Device Role / Timing Role: Wired-AND combiner using open-collector outputs to implement active-low OR logic (NAND + inversion). Use Value: Eliminates discrete diodes and pull-ups; single DM74ALS03BM provides four independent interrupt channels with deterministic LOW assertion. | Use Scenario: Conditioning digital outputs from analog comparators and limit switches into unified 5 V TTL logic levels for data acquisition front-ends. IC Role / Device Role / Timing Role: Signal conditioning gate ensuring VIH ≥ 2.0 V and VIL ≤ 0.8 V before ADC controller inputs. Use Value: Input threshold specs guarantee noise margin >0.4 V in electrically noisy industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NAND gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS03N | Same ALS logic family, identical electrical specs, but in PDIP-14 (θJA = 86.5°C/W) instead of SOIC-14. | Better thermal performance in through-hole prototyping or low-volume manual assembly; larger footprint. | Select SN74ALS03N for breadboarding, legacy repair, or thermal-limited through-hole designs. |
| 74HC03PW | CMOS-based, 2–6 V supply range, IOL = 4 mA (weaker sink), VIH/VIL = 3.15/1.35 V (non-TTL thresholds). | Not TTL-compatible; requires level-shifting for mixed-logic systems; lower power but slower at 5 V than ALS. | Choose 74HC03PW only in pure CMOS designs where supply flexibility and ultra-low ICC (<1 µA) outweigh TTL interoperability needs. |
Compared with SN74ALS03N, DM74ALS03BM offers superior board density and reflow compatibility; versus 74HC03PW, it guarantees TTL-level interoperability and higher sink current - critical for driving legacy loads without added components.
Availability
DM74ALS03BM is available at Aetrix Electronics and suitable for industrial bus interface, legacy system logic expansion, wired-AND interrupt aggregation, and TTL-compatible sensor aggregation requiring stable component supply and long-term obsolescence management.
Supply support for DM74ALS03BM 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 provider of high-performance analog and power semiconductor solutions, acquired by ON Semiconductor in 2016. Its legacy TTL and ALS logic families remain widely deployed in industrial and aerospace systems.
The DM74ALS03BM belongs to Fairchild's Advanced Low-Power Schottky (ALS) logic series, engineered for enhanced speed and reduced power consumption in TTL-compatible digital systems requiring robust noise immunity and bus-driving capability.
FAQ
What is the maximum sink current supported by each output of the DM74ALS03BM?
Each open-collector output of the DM74ALS03BM supports a guaranteed minimum sink current (IOL) of 8 mA at VO = 0.4 V (VCC = 4.5 V). This rating enables direct driving of multiple TTL inputs or small-signal loads like LEDs or optocouplers when paired with an appropriate external pull-up resistor.
Does the DM74ALS03BM require external pull-up resistors, and why?
Yes, the DM74ALS03BM requires external pull-up resistors on all four open-collector outputs. Because the outputs lack internal pull-ups, they can only actively pull LOW; HIGH states depend entirely on external resistors connecting to VCC or another logic supply. This architecture enables wired-AND logic and voltage-level translation.
Is the DM74ALS03BM pin-compatible with older TTL NAND gate variants?
Yes, the DM74ALS03BM is functionally and pin-for-pin compatible with 74S03 and 74LS03 devices. Its SOIC-14 footprint (M14A) matches the pinout of those families, allowing direct substitution in existing designs without layout changes - provided thermal and soldering process requirements are met.
What is the thermal resistance (θJA) of the DM74ALS03BM, and how does it impact design?
The DM74ALS03BM has a junction-to-ambient thermal resistance (θJA) of 116.0°C/W in its SOIC-14 package. This value informs thermal design margins: at 3 mA ICC (outputs LOW), power dissipation is ~15 mW, resulting in ~1.7°C rise above ambient - well within safe limits for standard PCB layouts without heatsinking.
Can the DM74ALS03BM operate outside the 0°C to +70°C temperature range?
No - the DM74ALS03BM is specified only for 0°C to +70°C free-air operating temperature. While absolute maximum ratings extend to −65°C to +150°C, electrical characteristics (propagation delay, VOL, IOL) are not guaranteed outside the recommended range. For extended temperature use, consider automotive-qualified alternatives or derating analysis with validation.
DM74ALS03BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74ALS
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -, 8mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 50ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DM74ALS03BM FAQ
1.How can I place an order for DM74ALS03BM through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS03BM 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 DM74ALS03BM reliable?
The price and inventory of DM74ALS03BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS03BM is usually 5 days.
3.What payment methods are accepted for DM74ALS03BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS03BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS03BM?
DM74ALS03BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS03BM 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 DM74ALS03BM?
For technical support, including DM74ALS03BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS03BM requirements.
6.How does Aetrix verify that DM74ALS03BM is sourced from the original manufacturer or authorized distributors?
All DM74ALS03BM 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 DM74ALS03BM meets industry standards.
7.What is the process for return or replacement of DM74ALS03BM?
All DM74ALS03BM units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS03BM, 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 DM74ALS03BM part is unused and in its original packaging.
Return procedure for DM74ALS03BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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