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onsemi DM74LS32M
- Part No.:
- DM74LS32M
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DM74LS32M.pdf
- Description:
- IC GATE OR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,086
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Product details
Overview
DM74LS32M from Fairchild Semiconductor is a quad 2-input OR gate logic IC in 14-lead SOIC package, operating at 4.75–5.25 V supply, with propagation delays of 3–15 ns (CL = 15–50 pF), output drive capability of ±8 mA, and guaranteed operation from 0°C to +70°C. It performs discrete Boolean OR logic for combinational logic design in TTL-compatible digital systems.
For engineers reviewing the DM74LS32M datasheet, pinout, applications, or equivalent options, key selection considerations include its 14-pin SOIC (M14A) footprint, LS-TTL input/output thresholds (VIL = 0.8 V, VIH = 2.0 V), output current ratings (IOL = 8 mA, IOH = −0.4 mA), and propagation delay consistency across temperature and load.
Technical Context
The DM74LS32M implements four independent 2-input OR gates using low-power Schottky (LS) bipolar transistor technology, ensuring compatibility with standard TTL logic families. Its input structure supports standard LS voltage thresholds and fan-in/fan-out specifications, while output stages are designed for direct interfacing with other LS or TTL loads without external buffering.
It operates strictly within the recommended 4.75–5.25 V VCC range and 0°C to +70°C ambient temperature window. All electrical characteristics-including VOL (0.25–0.5 V), VOH (2.7–3.4 V), and switching times-are specified under defined test conditions (e.g., CL = 15/50 pF, RL = 2 kΩ), with no guaranteed performance outside these constraints.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.75 V to 5.25 V - ensures stable operation in standard 5 V TTL power rails with ±5% tolerance. |
| Propagation Delay | 3–15 ns - defines maximum timing uncertainty per gate under 15–50 pF capacitive loading, critical for synchronous logic timing budgets. |
| IOL / IOH | 8 mA sink / −0.4 mA source - supports driving up to 20 LS-TTL inputs or one standard TTL input directly. |
| VIL / VIH | 0.8 V / 2.0 V - establishes noise margin boundaries compatible with legacy TTL and LS logic families. |
| Operating Temperature | 0°C to +70°C - specifies commercial-grade environmental envelope suitable for non-extended industrial environments. |
| Supply Current | ICCL = 4.9–9.8 mA - reflects worst-case quiescent draw when all outputs are LOW, impacting system-level power budgeting. |
Pinout & Package
DM74LS32M is housed in a 14-lead Small Outline Integrated Circuit (SOIC) package per JEDEC MS-120, 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 assigned to four OR gates: Gate 1 (1,2→3), Gate 2 (4,5→6), Gate 3 (8,9→10), Gate 4 (11,12→13). |
| 3, 6, 10, 13 | Output (Y per gate) | Four independent OR outputs-no internal connection; each drives its own load with LS-TTL-compatible voltage/current. |
| 7 | GND | Ground reference for all inputs, outputs, and internal circuitry; must be connected to system common ground plane. |
| 14 | VCC | Positive supply terminal; requires local 0.1 µF ceramic decoupling capacitor placed near pin 14 for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Quad 2-input OR function | Four fully isolated logic gates on one die-reduces board space and interconnect count versus discrete gate implementations. |
| LS-TTL compatibility | Matches standard TTL voltage thresholds and drive strength, enabling drop-in replacement in legacy 74LS designs without redesign. |
| Low-power Schottky process | Reduces power consumption vs. standard TTL (e.g., 74S), while maintaining speed-ICCL up to 9.8 mA vs. 74S32's >20 mA. |
| Guaranteed switching specs | Propagation delays validated at CL = 15 pF and CL = 50 pF-supports reliable timing analysis for PCB trace capacitance up to 50 pF. |
Applications
| Industrial Control Logic | Digital Instrumentation |
|---|---|
Use Scenario: Implementing enable-or-alarm combination logic in PLC I/O modules where multiple sensor fault signals trigger a single system alert line. IC Role / Device Role / Timing Role: Performs wired-OR aggregation of independent binary fault flags with sub-15 ns decision latency. Use Value: Eliminates need for external diode-OR networks or microcontroller polling, reducing BOM count and firmware complexity. | Use Scenario: Generating display enable strobes in multichannel data loggers that activate segment drivers only when any channel has valid data. IC Role / Device Role / Timing Role: Acts as combinatorial OR arbiter across four parallel data-ready signals to produce unified display-enable pulse. Use Value: Ensures deterministic, zero-software-latency activation of display hardware, meeting real-time visibility requirements. |
| Test Equipment Interface | Legacy System Repair |
Use Scenario: Building pass/fail result consolidation logic in automated test fixtures where multiple test steps must OR into a final go/no-go indicator. IC Role / Device Role / Timing Role: Provides deterministic, race-free logic summation of four independent test outcome lines. Use Value: Delivers consistent, glitch-free final status signal without requiring synchronization clocks or debouncing circuits. | Use Scenario: Replacing obsolete 74LS32 variants in field-repair scenarios for vintage telecom or military avionics subsystems. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in replacement for original 74LS32 in 14-pin SOIC layout. Use Value: Restores full functionality without PCB rework, leveraging identical pinout, timing, and DC specs as legacy parts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OR gate logic applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS32DR | Same logic function, 14-pin SOIC, but TI-specified VOH min = 2.7 V (identical), VOL max = 0.5 V (identical); slightly higher ICCL (5.5–10.5 mA). | Valid for same commercial-temp LS-TTL systems; not qualified for extended temp or MIL-STD-883 screening. | Select SN74LS32DR if sourcing from TI-authorized channels with preference for TI's quality documentation and long-term availability programs. |
| MC74LS32DG | Onsemi variant in 14-pin SOIC; identical VCC, VIH/VIL, IOL/IOH, and tPLH/tPHL specs; minor differences in IIH (15 µA vs. 20 µA) and IOS limits. | Functionally interchangeable in all standard 74LS designs; same JEDEC MS-120 footprint and thermal profile. | Choose MC74LS32DG when consolidating suppliers under Onsemi's portfolio or requiring Onsemi-specific reliability reporting. |
Compared with DM74LS32M, SN74LS32DR offers equivalent timing and drive but different supply current behavior, while MC74LS32DG matches all core parameters with minor input current variation-both serve as verified functional alternatives without layout changes in commercial 5 V logic systems.
Availability
DM74LS32M is available at Aetrix Electronics and suitable for industrial control logic, digital instrumentation, test equipment interface, and legacy system repair requiring stable component supply and long-term obsolescence management.
Supply support for DM74LS32M 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 and manufacturer of analog and mixed-signal semiconductors, acquired by ON Semiconductor in 2016; its legacy logic portfolio remains widely deployed and supported.
The DM74LS32M belongs to the 74LS logic family, engineered for low-power, high-speed TTL-compatible digital systems in commercial and light industrial applications.
FAQ
What logic function does the DM74LS32M implement?
The DM74LS32M implements four independent 2-input OR gates, each producing Y = A + B in positive-logic notation. Each gate operates with standard LS-TTL voltage thresholds and drive capability. The DM74LS32M is not configurable-it delivers fixed combinational OR logic with no enable, latch, or tri-state features. All four gates share only VCC and GND connections; their inputs and outputs are electrically isolated.
What is the correct pinout for DM74LS32M in SOIC package?
The DM74LS32M uses a standard 14-pin SOIC (M14A) pinout: Pins 1–2–3 = Gate 1 (A–B–Y), 4–5–6 = Gate 2, 8–9–10 = Gate 3, 11–12–13 = Gate 4, Pin 7 = GND, Pin 14 = VCC. Pin 3 is output of first gate, not input; no pins are NC or unused. This matches JEDEC MS-120 and is identical to other 74LS32 variants in SOIC.
Can DM74LS32M operate at 3.3 V supply?
No, DM74LS32M is not rated for 3.3 V operation. Its absolute minimum VCC is 4.75 V, and recommended operating range is strictly 4.75–5.25 V. Applying 3.3 V will result in undefined logic states, excessive propagation delay, or failure to switch. For 3.3 V systems, consider 74LVC32 or 74AHC32 logic families instead of DM74LS32M.
Is DM74LS32M RoHS compliant?
Original DM74LS32M devices manufactured prior to 2006 predate RoHS enforcement and are not RoHS compliant. However, current-production equivalents (e.g., SN74LS32DR, MC74LS32DG) offered by Texas Instruments and ON Semiconductor meet RoHS Directive 2011/65/EU. Aetrix Electronics supplies both legacy and RoHS-compliant versions-specify requirement at time of order for DM74LS32M.
What is the maximum capacitive load DM74LS32M can drive reliably?
DM74LS32M switching characteristics are specified up to CL = 50 pF, with tPLH/tPHL max = 15 ns under those conditions. Driving loads >50 pF may cause marginal timing violations or increased rise/fall times. For heavier loads, add a buffer stage or use a higher-drive device. The DM74LS32M itself does not include output impedance compensation or slew-rate control.
DM74LS32M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LS
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- OR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- 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
DM74LS32M FAQ
1.How can I place an order for DM74LS32M through Aetrix?
Please submit a Request for Quotation (RFQ) for DM74LS32M 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 DM74LS32M reliable?
The price and inventory of DM74LS32M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM74LS32M is usually 5 days.
3.What payment methods are accepted for DM74LS32M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM74LS32M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM74LS32M?
DM74LS32M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM74LS32M 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 DM74LS32M?
For technical support, including DM74LS32M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM74LS32M requirements.
6.How does Aetrix verify that DM74LS32M is sourced from the original manufacturer or authorized distributors?
All DM74LS32M 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 DM74LS32M meets industry standards.
7.What is the process for return or replacement of DM74LS32M?
All DM74LS32M units undergo pre-shipment inspection (PSI). If there is an issue with DM74LS32M, 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 DM74LS32M part is unused and in its original packaging.
Return procedure for DM74LS32M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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