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onsemi DM7438N
- Part No.:
- DM7438N
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
DM7438N.pdf
- Description:
- IC GATE NAND 4CH 2-INP 14MDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,868
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Product details
Overview
DM7438N from Fairchild Semiconductor is a quad 2-input NAND buffer IC with open-collector outputs, designed for wired-AND logic, level translation, and bus interface applications in TTL-compatible digital systems. It operates at 5V supply (4.75–5.25V), delivers 48mA sink current per output, and features propagation delays of 18–22ns at 25°C with 45pF load.
For engineers reviewing the DM7438N datasheet, pinout, applications, or equivalent options, key selection considerations include open-collector drive capability, input voltage thresholds (VIH = 2V, VIL = 0.8V), output voltage compliance (VOH = 5.5V), and compatibility with standard 14-pin PDIP layouts for legacy board integration.
Technical Context
The DM7438N implements four independent TTL-compatible NAND gates, each with an open-collector output requiring external pull-up resistors. Its logic function Y = AB is strictly defined by the truth table, with no internal pull-ups or Schmitt-trigger inputs.
It adheres to standard 74LS/74S-level input thresholds and output drive strength, supporting wired-logic configurations and mixed-voltage interfacing when paired with appropriate external resistors and supply rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Quad 2-input NAND (Y = AB) with independent gates |
| Output Type | Open-collector - requires external pull-up for HIGH output; enables wired-AND and level shifting |
| Supply Voltage | 4.75V to 5.25V - compatible with standard TTL power rails |
| Output Sink Current | 48mA per output - supports driving multiple TTL inputs or moderate loads |
| Propagation Delay | 18–22ns (tPHL/tPLH) at VCC = 5V, CL = 45pF, RL = 133Ω - suitable for medium-speed digital control |
| Input Thresholds | VIH = 2.0V min, VIL = 0.8V max - ensures reliable recognition of TTL logic levels |
| Operating Temperature | 0°C to +70°C - commercial-grade operation for non-extended environment applications |
Pinout & Package
DM7438N is housed in a 14-lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" wide, with standard through-hole mounting and 0.100" lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 4, 5, 8, 9, 11, 12 | Input (A/B) | Eight total inputs across four NAND gates - pins assigned as A1/B1, A2/B2, A3/B3, A4/B4 |
| 3, 6, 10, 13 | Output (Y) | Four open-collector outputs - each requires external pull-up resistor for HIGH logic assertion |
| 7 | GND | Ground reference for all logic and supply connections |
| 14 | VCC | +5V supply rail - powers internal circuitry; not connected to outputs directly due to open-collector architecture |
Key Features
| Feature | Design Value |
|---|---|
| Wired-AND capability | Enabled by open-collector outputs - allows multiple DM7438N outputs (or other OC devices) to share one pull-up and perform logical AND without external gates |
| TTL-compatible input thresholds | VIH ≥ 2.0V and VIL ≤ 0.8V - ensures interoperability with 74LS, 74S, and standard TTL families |
| High sink current per output | 48mA rating - supports direct driving of LEDs, relays, or multiple downstream TTL inputs (fan-out ≥ 20) |
| Standard 14-pin DIP footprint | JEDEC MS-001 compliant - enables drop-in replacement in legacy designs using 74xx38 or equivalent PDIP logic |
| Commercial temperature range | 0°C to +70°C operation - optimized for cost-sensitive industrial control, instrumentation, and consumer electronics |
Applications
| Industrial Control Panels | Legacy System Bus Interfaces |
|---|---|
Use Scenario: Discrete logic implementation for enable/disable sequencing of motor drivers and sensor modules in PLC I/O racks. IC Role / Device Role / Timing Role: DM7438N provides NAND-based gate control with open-collector outputs tied to shared bus lines for synchronized actuator activation. Use Value: Enables hardware-level priority arbitration and fault-safe shutdown via wired-AND configuration without additional logic layers. | Use Scenario: Interfacing between microcontroller address/data buses and peripheral chips requiring active-low enable signals. IC Role / Device Role / Timing Role: DM7438N generates decoded chip-select signals using NAND logic, with open-collector outputs pulled to 3.3V or 5V rails as needed. Use Value: Allows level translation between mixed-voltage subsystems while maintaining timing integrity (22ns max delay). |
| LED Status Indication | Power Supply Sequencing |
Use Scenario: Driving multiple panel-mounted LEDs in industrial HMIs where brightness and reliability are critical. IC Role / Device Role / Timing Role: DM7438N sinks LED current directly through its 48mA-rated open-collector outputs, eliminating need for discrete transistors. Use Value: Reduces BOM count and PCB area versus transistor+resistor solutions while ensuring consistent on/off timing. | Use Scenario: Generating controlled power-on reset and enable signals for multi-rail DC/DC converters in embedded power supplies. IC Role / Device Role / Timing Role: DM7438N implements NAND-based delay and synchronization logic to sequence 12V, 5V, and 3.3V rail activation. Use Value: Provides deterministic, component-level timing (18–22ns) for safe power-up without software dependency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NAND buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN7438N | Identical logic function, pinout, and electrical specs; manufactured by Texas Instruments with same 14-pin PDIP package | No functional deviation - validated for identical use cases including wired-AND and bus driving | Select SN7438N when TI-sourced components are required for supply chain diversification or qualification consistency |
| MC7438PG | Onsemi variant with identical 14-pin PDIP mechanical form and matching VIH/VIL/IOL specs; minor differences in ICCL (34–54mA vs 35–55mA) | Same open-collector architecture and timing performance; fully interchangeable in legacy designs | Choose MC7438PG for long-term availability assurance where Fairchild sourcing is constrained |
Compared with DM7438N, SN7438N offers identical functionality and second-source assurance, while MC7438PG provides extended lifecycle support with negligible parametric variance - both preserve wired-AND capability and 48mA sink strength without layout changes.
Availability
DM7438N is available at Aetrix Electronics and suitable for industrial control panels, legacy system bus interfaces, LED status indication, and power supply sequencing requiring stable component supply and long-lifecycle support.
Supply support for DM7438N 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 U.S.-based semiconductor company specializing in analog and discrete power products before its acquisition by ON Semiconductor in 2016.
The DM7438N belongs to Fairchild's legacy 74-series TTL logic family, engineered for robust wired-logic implementation, bus interfacing, and industrial control applications where open-collector flexibility and proven reliability are essential.
FAQ
What is the maximum sink current per output of the DM7438N?
The DM7438N specifies a maximum low-level output current (IOL) of 48mA per open-collector output under recommended operating conditions. This rating allows the DM7438N to directly drive LEDs, relays, or multiple TTL inputs without external buffering. The value is guaranteed across the full 0°C to +70°C temperature range and at VCC = 4.75V minimum.
Does the DM7438N have internal pull-up resistors on its outputs?
No, the DM7438N does not include internal pull-up resistors. Its outputs are strictly open-collector and require externally connected pull-up resistors to establish HIGH logic levels. This design enables wired-AND functionality and voltage-level translation - a defining feature confirmed in the device's General Description and Function Table sections of the official datasheet.
What is the propagation delay of the DM7438N at typical operating conditions?
The DM7438N exhibits a HIGH-to-LOW propagation delay (tPHL) of up to 18ns and a LOW-to-HIGH delay (tPLH) of up to 22ns when operated at VCC = 5V, TA = 25°C, with CL = 45pF and RL = 133Ω. These values are specified in the Switching Characteristics table and reflect real-world timing behavior for medium-speed digital control applications.
Can the DM7438N be used in mixed-voltage systems?
Yes, the DM7438N supports mixed-voltage interfacing via its open-collector outputs. By selecting an external pull-up resistor connected to a different supply rail (e.g., 3.3V), the DM7438N can generate logic-compatible HIGH levels for downstream 3.3V devices while being powered from 5V - a capability explicitly enabled by its VOH = 5.5V rating and open-collector architecture.
What package type is used for the DM7438N?
The DM7438N uses a 14-lead Plastic Dual-In-Line Package (PDIP), designated JEDEC MS-001 and package number N14A, with 0.300" body width and 0.100" lead pitch. This through-hole package is mechanically and electrically identical to industry-standard 74xx-series DIP logic, enabling direct replacement in legacy designs.
DM7438N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 7400
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NAND Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- Open Collector
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Max):
- -
- Current - Output High, Low:
- -, 48mA
- Input Logic Level - Low:
- 0.8V
- Input Logic Level - High:
- 2V
- Max Propagation Delay @ V, Max CL:
- 22ns @ 5V, 45pF
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-MDIP
DM7438N FAQ
1.How can I place an order for DM7438N through Aetrix?
Please submit a Request for Quotation (RFQ) for DM7438N 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 DM7438N reliable?
The price and inventory of DM7438N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DM7438N is usually 5 days.
3.What payment methods are accepted for DM7438N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DM7438N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DM7438N?
DM7438N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DM7438N 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 DM7438N?
For technical support, including DM7438N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DM7438N requirements.
6.How does Aetrix verify that DM7438N is sourced from the original manufacturer or authorized distributors?
All DM7438N 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 DM7438N meets industry standards.
7.What is the process for return or replacement of DM7438N?
All DM7438N units undergo pre-shipment inspection (PSI). If there is an issue with DM7438N, 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 DM7438N part is unused and in its original packaging.
Return procedure for DM7438N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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