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onsemi MC74LCX32DTG
- Part No.:
- MC74LCX32DTG
- Manufacturer:
- onsemi
- Category:
- Gates and Inverters
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MC74LCX32DTG.pdf
- Description:
- IC GATE OR 4CH 2-INP 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,072
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Product details
Overview
MC74LCX32DTG from onsemi is a low-voltage CMOS quad 2-input OR 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/LVTTL/LVCMOS compatibility. It serves as a logic-level translation and signal combining element in mixed-voltage digital systems such as industrial controllers and portable embedded interfaces.
For engineers reviewing the MC74LCX32DTG datasheet, pinout, applications, or equivalent options, key selection criteria include input voltage tolerance (5.5 V max), propagation delay (4.0 ns min at 4.5–5.5 V), output drive capability (±24 mA @ 3.0 V), and TSSOP-14 package compatibility with space-constrained PCB layouts.
Technical Context
The MC74LCX32DTG implements four independent 2-input OR logic functions in a single monolithic CMOS die, with inputs rated for 5.5 V DC regardless of VCC level-enabling safe interfacing between 3.3 V/2.5 V logic domains and legacy 5 V TTL systems. Its high-impedance TTL-compatible inputs reduce loading on upstream drivers while maintaining noise immunity.
Output stages are symmetrically designed for ±24 mA sink/source at 3.0 V, supporting robust fan-out and dynamic switching into 50 pF loads. Propagation delays range from 4.0 ns (at 4.5–5.5 V) to 9.8 ns (at 1.65–1.95 V), with output-to-output skew ≤1.0 ns across temperature (−40 °C to +125 °C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65 V to 5.5 V - supports dual-supply systems and voltage translation without level shifters |
| Input Voltage Max | 5.5 V - enables direct connection to 5 V TTL outputs without external clamping |
| Output Drive | ±24 mA @ 3.0 V - drives standard LVTTL loads with margin for multiple fan-outs |
| Propagation Delay | 4.0 ns max @ 4.5–5.5 V - ensures timing compliance in high-speed control paths |
| Quiescent ICC | 10 µA max - minimizes standby power in battery-operated or always-on subsystems |
| Operating Temp | −40 °C to +125 °C - qualified for automotive under-hood and industrial ambient environments |
| ESD Rating | 2000 V HBM - meets IEC 61000-4-2 Level 2 for board-level robustness |
Pinout & Package
TSSOP-14 (Case 948G), 4.9 mm × 4.4 mm × 1.2 mm body, 0.65 mm pitch, Pb-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | A0 Input | First input of OR gate 0 - must be tied to defined logic level if unused |
| 2 | B0 Input | Second input of OR gate 0 - high-impedance, 5.5 V tolerant |
| 3 | O0 Output | OR result of A0 ∨ B0 - drives LVTTL/LVCMOS loads with 24 mA capability |
| 4 | A1 Input | First input of OR gate 1 - electrically isolated from other gates |
| 5 | B1 Input | Second input of OR gate 1 - shares same VIH/VIL thresholds as A0 |
| 6 | O1 Output | OR result of A1 ∨ B1 - matched propagation delay to O0 (≤1.0 ns skew) |
| 7 | GND | Ground reference - all internal logic and I/O referenced to this pin |
| 8 | O2 Output | OR result of A2 ∨ B2 - identical AC/DC specs to O0 and O1 |
| 9 | B3 Input | Second input of OR gate 3 - 5.5 V tolerant, low leakage (±5 µA) |
| 10 | A3 Input | First input of OR gate 3 - compatible with 5 V TTL output swing |
| 11 | O3 Output | OR result of A3 ∨ B3 - supports hot-swap-safe operation when VCC = 0 V |
| 12 | B2 Input | Second input of OR gate 2 - VIH = 0.7×VCC (4.5–5.5 V range) |
| 13 | A2 Input | First input of OR gate 2 - VIL = 0.3×VCC (4.5–5.5 V range) |
| 14 | VCC | Positive supply - powers all four gates; decoupling capacitor required per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| 5 V-tolerant inputs | Enables direct interface with 5 V TTL without external resistors or translators |
| 24 mA balanced output drive | Supports driving multiple LVTTL inputs or moderate capacitive loads (≤50 pF) at full speed |
| 10 µA quiescent ICC | Reduces system-level standby power by >95% vs. older 74HC-series equivalents |
| −40 °C to +125 °C operation | Validated for automotive engine control modules and industrial PLC backplanes |
| Pb-free / RoHS-compliant | Meets EU Directive 2011/65/EU and JESD201A Class 2A whisker resistance requirements |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
|
Use Scenario: Combining multiple sensor fault signals (e.g., door open, seatbelt unfastened, trunk ajar) into a single aggregated alert line feeding a microcontroller interrupt pin. IC Role / Device Role / Timing Role: Logic OR combiner - performs real-time Boolean aggregation with sub-5 ns latency and no software overhead. Use Value: Eliminates need for polling or firmware-based signal merging; reduces MCU GPIO count and firmware complexity while ensuring deterministic response time. |
Use Scenario: Translating 5 V CAN transceiver status flags (TX/RX active, error flag) into 3.3 V domain for an ARM Cortex-M4 host controller. IC Role / Device Role / Timing Role: Voltage-level translator and signal conditioner - accepts 5 V inputs while operating from 3.3 V rail, preserving timing integrity. Use Value: Avoids discrete resistor-divider networks or dedicated level translators, saving board area and reducing BOM count in space-constrained ECUs. |
| Portable Medical Device Power Sequencing | IoT Edge Node Sensor Hub |
|
Use Scenario: Enabling backup power path when main battery voltage drops below threshold, using OR logic across two independent low-battery comparator outputs. IC Role / Device Role / Timing Role: Fault-tolerant enable combiner - provides fail-safe power-up sequencing with latchup immunity (>100 mA) and low ICC. Use Value: Ensures uninterrupted operation during battery switchover; 10 µA ICC extends runtime in sleep mode without compromising reliability. |
Use Scenario: Aggregating motion detection alerts from three PIR sensors into one wake-up signal for a low-power ESP32 host in a smart lighting node. IC Role / Device Role / Timing Role: Low-power event merger - operates at 1.8 V supply while accepting 3.3 V sensor outputs via 5 V-tolerant inputs. Use Value: Enables heterogeneous sensor integration without additional level-shifting ICs; 1.65 V minimum VCC supports ultra-low-power SoC domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 2-input OR gate applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LVC32APWR | Lower max VCC (3.6 V); no 5 V input tolerance; 32 mA drive @ 3.3 V | Restricted to 3.3 V-only systems; requires external clamping for 5 V inputs | Prefer when full 5 V interface is unnecessary and higher drive is needed |
| 74AHC32PW,118 | Wider VCC range (2–5.5 V); 8 mA drive @ 3.3 V; 5 V tolerant only up to 5.5 V VI | Higher propagation delay (7.5 ns @ 3.3 V); lower drive limits fan-out | Choose for cost-sensitive industrial designs where 5 V tolerance is secondary |
Compared with SN74LVC32APWR and 74AHC32PW,118, the MC74LCX32DTG uniquely delivers 5.5 V input tolerance alongside 24 mA drive and 1.65 V minimum operation - making it the only option among the three suitable for mixed-voltage automotive and industrial edge nodes requiring both low-voltage efficiency and legacy 5 V interoperability.
Availability
MC74LCX32DTG is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, automotive body control modules, and portable medical device power sequencing requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MC74LCX32DTG 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 focused on energy-efficient innovation for automotive, industrial, cloud, and IoT applications, with leadership in power management, analog, sensors, and logic solutions.
The MC74LCX32DTG belongs to the LCX family of low-voltage CMOS logic devices, engineered specifically for mixed-supply system interfacing, voltage translation, and low-power digital signal conditioning in harsh-environment applications.
FAQ
What is the maximum input voltage rating for MC74LCX32DTG?
The MC74LCX32DTG supports a maximum DC input voltage (VI) of 5.5 V, independent of VCC level. This allows direct connection to 5 V TTL outputs even when powered from 1.65 V to 3.3 V supplies. Exceeding 5.5 V risks permanent damage, and floating inputs are prohibited per datasheet guidance.
Can MC74LCX32DTG operate at 1.8 V supply voltage?
Yes, MC74LCX32DTG is fully specified for operation at 1.8 V (within its 1.65 V to 5.5 V VCC range). At 1.8 V, VIH is 0.65×VCC (1.17 V min), VIL is 0.35×VCC (0.63 V max), and propagation delay is 9.8 ns max - enabling use in ultra-low-power microcontroller peripheral logic and battery-powered sensor hubs.
Is MC74LCX32DTG pin-compatible with standard SOIC-14 OR gates?
No - MC74LCX32DTG uses the TSSOP-14 package (Case 948G), not SOIC-14. While the pin function mapping matches industry-standard quad 2-input OR gate logic diagrams (A0/B0/O0, A1/B1/O1, etc.), physical layout differs: TSSOP-14 has 0.65 mm pitch and 4.9×4.4 mm footprint versus SOIC-14's 1.27 mm pitch and 8.7×3.9 mm size. PCB redesign is required for substitution.
Does MC74LCX32DTG support hot-swap or power-down modes?
Yes - MC74LCX32DTG features power-off leakage current ≤10 µA when VCC = 0 V, and outputs enter high-impedance state during power-down. Inputs remain 5.5 V tolerant even with VCC = 0 V, allowing safe insertion into live backplanes or hot-pluggable modules without risk of latchup or bus contention.
What is the thermal resistance (θJA) of MC74LCX32DTG in TSSOP-14 package?
The junction-to-ambient thermal resistance (θJA) for MC74LCX32DTG in TSSOP-14 package is 150 °C/W under JEDEC JESD51-7 conditions (76 mm × 114 mm, 2-oz copper, still air). This value assumes standard PCB layout with thermal vias; actual θJA improves with enhanced copper pour and airflow, critical for sustained 24 mA output loading at high ambient temperatures.
MC74LCX32DTG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- 74LCX
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Logic Type:
- OR 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-TSSOP
MC74LCX32DTG FAQ
1.How can I place an order for MC74LCX32DTG through Aetrix?
Please submit a Request for Quotation (RFQ) for MC74LCX32DTG 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 MC74LCX32DTG reliable?
The price and inventory of MC74LCX32DTG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC74LCX32DTG is usually 5 days.
3.What payment methods are accepted for MC74LCX32DTG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC74LCX32DTG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC74LCX32DTG?
MC74LCX32DTG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC74LCX32DTG 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 MC74LCX32DTG?
For technical support, including MC74LCX32DTG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC74LCX32DTG requirements.
6.How does Aetrix verify that MC74LCX32DTG is sourced from the original manufacturer or authorized distributors?
All MC74LCX32DTG 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 MC74LCX32DTG meets industry standards.
7.What is the process for return or replacement of MC74LCX32DTG?
All MC74LCX32DTG units undergo pre-shipment inspection (PSI). If there is an issue with MC74LCX32DTG, 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 MC74LCX32DTG part is unused and in its original packaging.
Return procedure for MC74LCX32DTG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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