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onsemi MC74LCX02DG
- Part No.:
- MC74LCX02DG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MC74LCX02DG.pdf
- Description:
- IC GATE NOR 4CH 2-INP 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MC74LCX02DG from onsemi is a low-voltage CMOS quad 2-input NOR gate operating from 1.65 V to 5.5 V, featuring 5 V-tolerant inputs, 24 mA balanced output drive at 3.0 V, near-zero static supply current (10 µA), and TTL/LVCMOS compatibility. It enables level-shifting logic interfacing in mixed-voltage systems such as industrial I/O controllers and embedded microcontroller peripheral buses.
For engineers reviewing the MC74LCX02DG datasheet, pinout, applications, or equivalent options, key selection considerations include its 5 V input tolerance for legacy TTL coexistence, SOIC-14 package footprint, guaranteed operation up to +125°C, and propagation delay of 4.2 ns at 5 V - critical for timing-critical glue logic and bus arbitration circuits.
Technical Context
The MC74LCX02DG implements four independent 2-input NOR gates in a single monolithic CMOS structure with high-impedance TTL-compatible inputs and rail-to-rail CMOS outputs. Its VIH/VIL thresholds scale with VCC across 1.65–5.5 V, enabling robust noise margin in both 1.8 V and 3.3 V domains.
Input protection includes 5.5 V absolute maximum rating and ESD robustness >2000 V HBM, while output stages deliver symmetrical ±24 mA sink/source capability at 3.0 V - supporting direct driving of multiple LVTTL loads without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.65 V to 5.5 V - supports direct integration into mixed-supply systems without level shifters |
| Input Voltage Tolerance | Up to 5.5 V - allows safe connection to 5 V TTL outputs without clamping diodes or resistors |
| Propagation Delay | 4.2 ns max at VCC = 4.5–5.5 V - enables sub-200 MHz toggle rates in combinatorial paths |
| Output Drive | ±24 mA at VCC = 3.0 V - drives up to 10 LVTTL loads or 2 LVCMOS loads simultaneously |
| Quiescent Current | 10 µA max - reduces standby power in battery-backed or always-on control modules |
| Operating Temperature | −40°C to +125°C - qualified for under-hood automotive and industrial motor-control environments |
| ESD Rating | Human Body Model >2000 V - withstands handling and board-level ESD events without protection circuitry |
Pinout & Package
MC74LCX02DG is packaged in a 14-pin SOIC (Case 751A), with 1.27 mm pitch, 8.75 mm × 3.9 mm body, and Pb-free finish. Pin 1 is marked by notch or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | O0, O1, O2, O3 | NOR gate outputs - active-low logic; tri-state capable only via external enable (not internal) |
| 2, 3, 5, 6, 8, 9, 11, 12 | A0/B0, A1/B1, A2/B2, A3/B3 | Independent input pairs per gate - must not float; tie unused inputs to VCC or GND |
| 7 | GND | Digital ground reference - decoupling capacitor required within 5 mm of pin |
| 14 | VCC | Power supply - accepts 1.65–5.5 V; requires local 0.1 µF ceramic bypass |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant inputs | Enables seamless interface between 3.3 V/2.5 V logic domains and legacy 5 V TTL peripherals without external voltage translators |
| 24 mA balanced output drive | Eliminates need for buffer ICs when driving multiple downstream logic inputs or small-signal LEDs |
| 10 µA quiescent ICC | Reduces system-level leakage current in always-on monitoring circuits, extending battery life in portable diagnostics |
| Latchup immunity >100 mA | Prevents destructive latchup during transient overvoltage or hot-plug events in industrial backplane applications |
| Pb-free, RoHS-compliant packaging | Meets global environmental compliance requirements for automotive and medical OEM production programs |
Applications
| Industrial PLC I/O Modules | Automotive Body Control Units |
|---|---|
Use Scenario: Logic-level translation and signal conditioning between 5 V sensor interfaces and 3.3 V microcontroller GPIOs in programmable logic controllers. IC Role / Device Role / Timing Role: Quad NOR gate performing active-low enable decoding and bus arbitration for discrete input/output expansion cards. Use Value: Eliminates need for discrete level-shifters while maintaining <4.2 ns propagation delay for real-time response to emergency stop signals. |
Use Scenario: Door lock actuator control sequencing and mirror position feedback validation in vehicle body electronics. IC Role / Device Role / Timing Role: Glue logic implementing NAND/NOR-based state machines for multi-signal interlock verification before motor activation. Use Value: 125°C operation ensures reliability in engine bay proximity; 5 V tolerance accommodates legacy 5 V LIN transceiver signaling. |
| Medical Diagnostic Equipment | Test & Measurement Instrumentation |
Use Scenario: Isolated power-up sequencing and fault flag consolidation across analog front-end subsystems in portable ultrasound units. IC Role / Device Role / Timing Role: Combinatorial logic element generating system-ready strobes and error latches from multiple sensor health monitors. Use Value: Near-zero ICC minimizes standby current in battery-operated devices; RoHS/Pb-free compliance meets IEC 60601-1 regulatory requirements. |
Use Scenario: Digital pattern generation and trigger synchronization between FPGA-based waveform generators and ADC capture controllers. IC Role / Device Role / Timing Role: High-speed gating element for pulse-width modulation edge alignment and clock domain crossing handshaking. Use Value: 4.2 ns delay at 5 V enables precise 200+ MHz timing resolution; low CIN/COUT (7/8 pF) preserves signal integrity on dense PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input NOR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC02APWR | Lower VCC min (1.65 V same), but VI max = 5.5 V only with external clamp; 24 mA drive at 3.3 V only | Requires external 5 V clamping for legacy TTL interface; less robust in mixed-voltage hot-swap scenarios | Preferred where cost sensitivity outweighs 5 V input robustness; verify layout-level ESD protection |
| 74AUP2G02GW,125 | Ultra-low ICC (0.9 µA), but VI max = 3.6 V; no 5 V tolerance; 4 mA drive at 3.3 V | Suitable only for pure 1.8/2.5/3.3 V systems; incompatible with 5 V signal sources | Select only in battery-powered IoT nodes where ultra-low static power dominates timing and interface needs |
Compared with SN74LVC02APWR and 74AUP2G02GW,125, the MC74LCX02DG uniquely delivers verified 5 V input tolerance without external components, full 24 mA drive across its entire 1.65–5.5 V range, and guaranteed +125°C operation - making it the only drop-in solution for industrial and automotive mixed-voltage glue logic requiring zero design margin compromise.
Availability
MC74LCX02DG is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive body control units, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74LCX02DG 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.
The MC74LCX02DG belongs to the LCX family of low-voltage, 5 V-tolerant logic ICs designed specifically for seamless voltage-domain bridging in next-generation embedded systems with heterogeneous supply rails.
FAQ
What is the maximum input voltage rating for MC74LCX02DG?
The MC74LCX02DG has a DC input voltage rating of −0.5 V to +6.5 V, with a specified 5.5 V maximum for normal operation. This 5 V tolerance allows direct interfacing with standard TTL outputs without external protection, and is validated across the full −40°C to +125°C temperature range per the official onsemi datasheet Rev. 11.
Does MC74LCX02DG support operation at 1.8 V supply?
Yes, MC74LCX02DG is fully specified for operation at 1.65 V to 5.5 V, including 1.8 V. At VCC = 1.8 V, it delivers guaranteed VIH = 1.17 V and VIL = 0.63 V, with propagation delay ≤10.3 ns and 24 mA output drive capability - all confirmed in the Recommended Operating Conditions and DC Electrical Characteristics tables.
Is MC74LCX02DG pin-compatible with standard 74-series NOR gates?
No, MC74LCX02DG uses the industry-standard 14-pin SOIC pinout for quad 2-input NOR gates (pin 1 = O0, pins 2–3 = A0/B0, etc.), matching the 74HC02 and 74LS02 footprints. However, its 5 V-tolerant inputs and low-voltage operation differentiate its electrical behavior - mechanical compatibility does not imply functional drop-in replacement without verifying voltage domain constraints.
What is the thermal resistance (θJA) of MC74LCX02DG in SOIC-14 package?
The MC74LCX02DG in SOIC-14 (Case 751A) has a junction-to-ambient thermal resistance (θJA) of 116°C/W, measured under JEDEC JESD51-7 conditions (76 mm × 114 mm, 2-oz copper, still air). This value is documented in the Maximum Ratings table on page 2 of the official datasheet and applies to standard PCB mounting with recommended copper pour.
Can unused inputs on MC74LCX02DG be left floating?
No - the datasheet explicitly states "For ICC reasons, DO NOT FLOAT Inputs" and recommends tying all unused inputs to either VCC or GND. Floating inputs increase quiescent current, cause unpredictable logic states, and may induce oscillation or excessive power dissipation due to intermediate voltage biasing of CMOS input stages.
MC74LCX02DG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- NOR Gate
- Number of Circuits:
- 4
- Number of Inputs:
- 2
- Features:
- -
- Voltage - Supply:
- 2V ~ 3.6V
- Current - Quiescent (Max):
- 10 µA
- Current - Output High, Low:
- 24mA, 24mA
- Input Logic Level - Low:
- 0.7V ~ 0.8V
- Input Logic Level - High:
- 1.7V ~ 2V
- Max Propagation Delay @ V, Max CL:
- 5.5ns @ 3.3V, 50pF
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
MC74LCX02DG FAQ
1.How can I place an order for MC74LCX02DG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX02DG 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 MC74LCX02DG reliable?
The price and inventory of MC74LCX02DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX02DG is usually 5 days.
3.What payment methods are accepted for MC74LCX02DG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX02DG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX02DG?
MC74LCX02DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX02DG 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 MC74LCX02DG?
For technical support, including MC74LCX02DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX02DG requirements.
6.How does Aetrix verify that MC74LCX02DG is sourced from the original manufacturer or authorized distributors?
All MC74LCX02DG 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 MC74LCX02DG meets industry standards.
7.What is the process for return or replacement of MC74LCX02DG?
All MC74LCX02DG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX02DG, 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 MC74LCX02DG part is unused and in its original packaging.
Return procedure for MC74LCX02DG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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