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onsemi DM74ALS27MX
- Part No.:
- DM74ALS27MX
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74ALS27MX.pdf
- Description:
- IC GATE NOR 3CH 3-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,460
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Product details
Overview
DM74ALS27MX from Fairchild Semiconductor is a triple 3-input NOR gate logic IC implemented in advanced oxide-isolated, ion-implanted Schottky TTL technology. It delivers guaranteed switching performance at 50 pF load across full temperature (0°C to +70°C) and supply voltage (4.5V–5.5V) ranges, with propagation delays as low as 3 ns (tPHL) and 4 ns (tPLH), enabling high-speed combinational logic in industrial control and digital instrumentation.
For engineers reviewing the DM74ALS27MX datasheet, pinout, applications, or equivalent options, key selection considerations include its SOIC-14 package, 8 mA low-level output drive, −0.4 mA high-level output capability, input clamp voltage of −1.5 V, and functional compatibility with standard TTL families including 74S27 and 74LS27.
Technical Context
The DM74ALS27MX integrates three independent 3-input NOR gates on a single die using Schottky-clamped bipolar transistor technology. Each gate implements the Boolean function Y = A + B + C with active-low output logic, and supports fan-out of up to 20 LS-TTL loads under recommended operating conditions.
Its electrical behavior is characterized by guaranteed AC timing over the full commercial temperature range and VCC tolerance, with VIH = 2.0 V minimum, VIL = 0.8 V maximum, VOL = 0.5 V max at IOL = 8 mA, and VOH ≥ VCC − 2 V at IOH = −0.4 mA - ensuring robust noise margin and interoperability with legacy TTL systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation across standard TTL power rail tolerances |
| tPHL / tPLH | 3 ns / 4 ns min - enables sub-10 ns critical path timing in synchronous logic designs |
| IOL / IOH | 8 mA / −0.4 mA - drives up to 20 LS-TTL inputs without buffering |
| VIL / VIH | 0.8 V / 2.0 V - provides 0.4 V DC noise margin against TTL-compatible logic thresholds |
| VIK | −1.5 V - protects inputs from negative transients during hot insertion or ESD events |
| ICC (Outputs LOW) | 2–4 mA - defines worst-case power draw in active-low output states for thermal budgeting |
Pinout & Package
DM74ALS27MX is supplied in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, 0.150″ narrow body, with θJA = 116.0°C/W. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 5, 6, 8, 10, 11, 12 | Input (A/B/C per gate) | Three independent 3-input NOR gates: Gate 1 (pins 1,2,3→4), Gate 2 (5,6,8→9), Gate 3 (10,11,12→13) |
| 4, 9, 13 | Output (Y) | Active-low NOR outputs - sink current when any input is HIGH |
| 7 | GND | Logic ground reference and primary return path for output sink current |
| 14 | VCC | +5 V supply input - powers all three gates and internal clamping diodes |
Key Features
| Feature | Design Value |
|---|---|
| Triple 3-input NOR logic | Reduces board space vs. discrete gate implementations; supports compact sum-of-products logic synthesis |
| Guaranteed AC specs at 50 pF | Enables predictable timing closure without derating for capacitive loading in PCB traces and fan-out |
| Pin-for-pin compatible with 74S27/74LS27 | Allows drop-in replacement in existing TTL designs without layout changes or signal integrity revalidation |
| Advanced Schottky TTL process | Delivers faster switching than standard TTL while maintaining backward compatibility and lower power than 74S |
Applications
| Industrial PLC Logic Modules | Digital Instrumentation Front-Ends |
|---|---|
Use Scenario: Implementing reset arbitration and status encoding in programmable logic controller I/O modules. IC Role / Device Role / Timing Role: NOR gate performing wired-OR logic inversion for fault-safe reset generation. Use Value: Sub-10 ns propagation delay ensures deterministic response to emergency stop signals within cycle-time budgets. | Use Scenario: Signal conditioning and level translation between sensor interface ASICs and microcontroller GPIOs. IC Role / Device Role / Timing Role: Level-shifting combinatorial logic block interfacing 5 V sensors to 3.3 V MCU inputs via open-collector pull-up. Use Value: 8 mA sink capability directly drives standard pull-up resistors without external buffers. |
| Legacy Computer Backplanes | Test Equipment Control Panels |
Use Scenario: Bus arbitration and address decoding in vintage 8-bit computer expansion slots. IC Role / Device Role / Timing Role: Active-low enable generator for memory-mapped peripheral selection. Use Value: Guaranteed timing across 0°C–70°C ensures reliable boot sequence execution in unregulated environments. | Use Scenario: Pushbutton debouncing and mode selection logic in benchtop oscilloscope front-panel controllers. IC Role / Device Role / Timing Role: Synchronous NOR-based state encoder for multi-button priority resolution. Use Value: Input clamp voltage of −1.5 V prevents damage from user-induced ESD during panel interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NOR gate logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ALS27N | Same logic function and AC/DC specs, but in PDIP-14 (N14A) package with θJA = 86.5°C/W | Better thermal performance in through-hole prototyping or low-volume manual assembly | Select SN74ALS27N when board assembly uses wave soldering or requires socketed evaluation |
| 74F27SCX | Fast TTL variant with tPHL/tPLH ≈ 2.5 ns, higher ICC (6–10 mA), and VIH = 2.0 V identical | Higher speed at cost of increased power and reduced noise margin margin at VCC extremes | Select 74F27SCX only when sub-3 ns propagation is mandatory and thermal/power budgets allow |
Compared with SN74ALS27N and 74F27SCX, the DM74ALS27MX offers optimal balance of speed (3–4 ns), power efficiency (2–4 mA ICC), and SOIC-14 footprint for automated SMT production - making it preferred for volume industrial control boards where thermal management favors surface-mount packages.
Availability
DM74ALS27MX is available at Aetrix Electronics and suitable for industrial PLC logic modules, digital instrumentation front-ends, and legacy computer backplane designs requiring stable component supply and long-term obsolescence mitigation.
Supply support for DM74ALS27MX 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 semiconductors, acquired by ON Semiconductor in 2016. Its legacy TTL logic portfolio remains widely deployed in industrial and aerospace systems.
The DM74ALS27MX belongs to Fairchild's 74ALS advanced low-power Schottky logic family, engineered for high-speed, low-power digital control applications where compatibility with earlier TTL generations is essential.
FAQ
What logic function does the DM74ALS27MX implement?
The DM74ALS27MX implements three independent 3-input NOR gates, each producing Y = NOT(A OR B OR C). Its truth table confirms active-low output: output is HIGH only when all three inputs are LOW. This function is used for negative-logic decoding, reset generation, and wired-OR bus structures in legacy digital systems.
Is the DM74ALS27MX pin-compatible with other 74-series NOR gates?
Yes, the DM74ALS27MX is pin-for-pin compatible with the 74S27 and 74LS27 in the same SOIC-14 package. Pin assignments for inputs, outputs, VCC, and GND match exactly, enabling direct substitution in existing layouts without redesign. However, AC timing and drive strength differ - verify timing margins in high-frequency applications.
What is the maximum output sink current specification for the DM74ALS27MX?
The DM74ALS27MX guarantees a minimum low-level output current (IOL) of 8 mA at VOL ≤ 0.5 V with VCC = 4.5 V. This allows direct driving of up to 20 LS-TTL inputs or standard 4.7 kΩ pull-up resistors, supporting robust fan-out without external buffer stages in industrial control logic networks.
Does the DM74ALS27MX support operation outside the commercial temperature range?
No, the DM74ALS27MX is rated for 0°C to +70°C free-air operating temperature only. Its electrical characteristics - including propagation delay, VOL, and VIH - are specified and guaranteed solely within this commercial range. For extended temperature applications, consider automotive-qualified alternatives such as the SN74AHCT27QPWRQ1.
What package type is used for the DM74ALS27MX?
The DM74ALS27MX uses a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-012, designated M14A, with 0.150″ body width and standard 1.27 mm lead pitch. This surface-mount package supports automated pick-and-place assembly and offers better thermal resistance (θJA = 116.0°C/W) than PDIP variants.
DM74ALS27MX 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:
- NOR Gate
- Number of Circuits:
- 3
- Number of Inputs:
- 3
- 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:
- 15ns @ 5V, 50pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
DM74ALS27MX FAQ
1.How can I place an order for DM74ALS27MX through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74ALS27MX 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 DM74ALS27MX reliable?
The price and inventory of DM74ALS27MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74ALS27MX is usually 5 days.
3.What payment methods are accepted for DM74ALS27MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74ALS27MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74ALS27MX?
DM74ALS27MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74ALS27MX 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 DM74ALS27MX?
For technical support, including DM74ALS27MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74ALS27MX requirements.
6.How does Aetrix verify that DM74ALS27MX is sourced from the original manufacturer or authorized distributors?
All DM74ALS27MX 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 DM74ALS27MX meets industry standards.
7.What is the process for return or replacement of DM74ALS27MX?
All DM74ALS27MX units undergo pre-shipment inspection (PSI). If there is an issue with DM74ALS27MX, 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 DM74ALS27MX part is unused and in its original packaging.
Return procedure for DM74ALS27MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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