About us Contact Us Submit BOM
RFQs(0)
English
Close Menu
View All

Please refer to the English Version as our Official Version.Return

Europe
France(Français) Germany(Deutsch) Italy(Italia) Russian(русский) Poland(polski) Czech(Čeština) Luxembourg(Lëtzebuergesch) Netherlands(Nederland) Iceland(íslenska) Hungarian(Magyarország) Spain(español) Portugal(Português) Turkey(Türk dili) Bulgaria(Български език) Ukraine(Україна) Greece(Ελλάδα) Israel(עִבְרִית) Sweden(Svenska) Finland(Svenska) Finland(Suomi) Romania(românesc) Moldova(românesc) Slovakia(Slovenská) Denmark(Dansk) Slovenia(Slovenija) Slovenia(Hrvatska) Croatia(Hrvatska) Serbia(Hrvatska) Montenegro(Hrvatska) Bosnia and Herzegovina(Hrvatska) Lithuania(lietuvių) Spain(Português) Switzerland(Deutsch) United Kingdom(English)
Asia/Pacific
Japan(日本語) Korea(한국의) Thailand(ภาษาไทย) Malaysia(Melayu) Singapore(Melayu) Vietnam(Tiếng Việt) Philippines(Pilipino)
Africa, India and Middle East
United Arab Emirates(العربية) Iran(فارسی) Tajikistan(فارسی) India(हिंदी) Madagascar(malaɡasʲ)
South America / Oceania
New Zealand(Maori) Brazil(Português) Angola(Português) Mozambique(Português)
North America
United States(English) Canada(English) Haiti(Ayiti) Mexico(español)
HomeProductsIntegrated Circuits (ICs)Logic - Gates and Inverters74LCX38MTCX
74LCX38MTCX Image
74LCX38MTCX Image - 1
Image may be representation.
See specifications for product details.
Share
 Favorite
EXPRESS OPTION
Payment method

74LCX38MTCX - Fairchild Semiconductor

Manufacturer Part Number
74LCX38MTCX
Manufacturer
Fairchild (onsemi)
Allelco Part Number
32D-74LCX38MTCX
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
149,670 pcs available, New & Original
Parts Description
NAND GATE, LVC/LCX/Z SERIES, 4-F
Package
14-TSSOP
Data sheet
-
RoHs Status
 
Compare
Our certification
In stock: 149670
  • Unit Price: $0.297
  • Subtotal: $0.00

Want a better price?
Add to Cart and Submit RFQ now, we'll contact you immediately.

Quantity Unit Price Ext. Price
1+ $0.297 $0.30
10+ $0.289 $2.89
30+ $0.283 $8.49
100+ $0.278 $27.80
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

74LCX38MTCX Tech Specifications
Fairchild Semiconductor - 74LCX38MTCX technical specifications, attributes, parameters and parts with similar specifications to Fairchild Semiconductor - 74LCX38MTCX

Product Attribute Attribute Value
Manufacturer Fairchild (onsemi)
Voltage - Supply 2V ~ 3.6V
Supplier Device Package 14-TSSOP
Series 74LCX
Package / Case 14-TSSOP (0.173", 4.40mm Width)
Package Bulk
Operating Temperature -40°C ~ 85°C
Number of Inputs 2
Number of Circuits 4
Product Attribute Attribute Value
Mounting Type Surface Mount
Max Propagation Delay @ V, Max CL 5ns @ 3.3V, 50pF
Logic Type NAND Gate
Input Logic Level - Low 0.7V ~ 0.8V
Input Logic Level - High 1.7V ~ 2V
Features Open Drain
Current - Quiescent (Max) 10 µA
Current - Output High, Low -, 24mA
Base Product Number 74LCX38

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
ECCN EAR99
HTSUS 8542.39.0001

Frequently Asked Questions(FAQ)

What are the key differences between the 74LCX38MTCX and a standard 74HC38 NAND gate in terms of supply voltage compatibility and drive capability?
The 74LCX38MTCX operates across a supply voltage range of 2V to 3.6V, offering improved low-voltage operation compared to many HC-series devices that typically require at least 4.5V. This makes it suitable for mixed-voltage systems. Additionally, the LCX38 features an open-drain output configuration with a maximum output current of 24mA in the low state, providing better flexibility in interfacing than standard totem-pole outputs found in HC variants. However, unlike the 74HC38, the LCX38 does not specify a high-state output current, indicating its design emphasis on sinking rather than sourcing current.
Can the 74LCX38MTCX safely interface with 5V logic signals when used in a 3.3V system without level shifting?
Yes, the 74LCX38MTCX can tolerate 5V inputs even when powered at 3.3V due to its 5V-tolerant input buffers. The input high-level threshold is specified as 1.7V to 2V at VCC = 3.3V, which allows robust recognition of standard 5V TTL high levels (typically ≥2.4V) without degradation. Similarly, the low-level threshold remains well below 0.8V, ensuring reliable detection of ground-referenced signals. This feature simplifies system integration in mixed-voltage environments where legacy 5V components must coexist with 3.3V logic.
How does the propagation delay of the 74LCX38MTCX compare to other low-power logic families like 74LVC or 74LVX under similar loading conditions?
At VCC = 3.3V and a load capacitance of 50pF, the 74LCX38MTCX exhibits a propagation delay of approximately 5ns. While slightly slower than some newer LVC-family gates (which may achieve sub-3ns delays under identical conditions), the LCX38 maintains competitive performance due to its optimized transistor design. It generally outperforms older HC/LS series parts by 30–50% in speed while consuming significantly less static power—quiescent current remains below 10µA across the full temperature range.
Is it acceptable to use multiple stages of 74LCX38MTCX gates in cascade for signal buffering in high-speed digital designs?
Yes, but with careful attention to fan-out and timing margins. Each gate can sink up to 24mA, allowing moderate fan-out capability—typically supporting 4–6 standard CMOS loads per output. However, because the outputs are open drain, pull-up resistors are required on each output line, which adds parasitic capacitance and may increase rise times. For cascading applications requiring tight synchronization (e.g., clock distribution), consider using dedicated buffer ICs instead. In general-purpose digital control paths with moderate frequency requirements (<100 MHz), cascaded LCX38s function reliably within their specified 5ns propagation delay budget.
What considerations apply when selecting pull-up resistors for the open-drain outputs of the 74LCX38MTCX in bus applications?
Pull-up resistor values must balance speed versus power and noise immunity. Lower resistances (e.g., 1kΩ–4.7kΩ) reduce rise time and improve noise margin but increase DC current draw from VCC. Higher values (10kΩ–100kΩ) save power but result in slower transitions, potentially violating setup/hold times at higher frequencies. For I²C-style protocols or shared buses, typical values around 4.7kΩ are common. Always ensure total sink current does not exceed the combined capacity of all active drivers; worst-case current through any single pull-up path should be limited to stay within safe operating limits relative to VCC and ambient temperature.
Does the 74LCX38MTCX support hot-swapping or live insertion in industrial environments?
Not inherently. Although the device includes ESD protection diodes on inputs and outputs, these are designed for handling electrostatic discharge events during normal handling, not continuous exposure to inductive surges or voltage transients from live insertion. Hot-swapping without external protection (such as TVS diodes or series resistors) risks exceeding absolute maximum ratings—particularly on VCC and input pins—and could compromise reliability over time. Therefore, for robust industrial implementations involving plug-in modules, additional circuit isolation is strongly recommended.
How does the operating temperature range (-40°C to 85°C) of the 74LCX38MTCX impact its use in automotive or extended-environment applications?
The -40°C to 85°C rating indicates suitability for commercial and industrial temperature grades but falls short of AEC-Q100 Grade 1 qualification required for full automotive operation (up to 125°C). While the device functions reliably within this range, long-term drift in propagation delay or leakage current near upper bounds may affect timing-critical designs. If deployed in harsh environments beyond 85°C (e.g., engine bays or outdoor enclosures), thermal derating of timing margins or selection of higher-grade alternatives should be evaluated.
Can the 74LCX38MTCX replace a discrete transistor-based NAND gate implementation in space-constrained PCB layouts?
Absolutely. With four independent 2-input NAND channels in a compact 14-TSSOP package (4.40mm width), the 74LCX38MTCX offers significant board area savings compared to discrete solutions. Its surface-mount packaging enables automated assembly, and the integrated open-drain outputs simplify driving LEDs, relays, or pull-up networks without extra components. Given its low quiescent current (≤10µA) and fast response (5ns), it efficiently replaces multiple discrete transistors while improving consistency and reducing parasitic effects in miniaturized designs.
Are there any known limitations when using the 74LCX38MTCX as part of a glitch-filtering circuit with RC networks?
Yes. Because the outputs are open drain, connecting them directly to a capacitor without a parallel pull-up resistor creates a floating node that cannot charge properly. This configuration fails to form a valid RC filter and risks undefined logic states. To implement edge filtering, connect a fixed resistor between the output pin and VCC, then place the capacitor from output to ground. Choose resistor value to limit sink current and capacitor size to avoid excessive delay. Ensure resulting time constant remains compatible with system timing requirements.
How does package thermal resistance affect the 74LCX38MTCX’s performance under continuous heavy switching loads?
Although not explicitly detailed in the datasheet, the 14-TSSOP package has modest thermal conductivity compared to larger SOIC or QFN variants. Under sustained high-frequency switching with multiple outputs active simultaneously, localized heating may occur. While the junction-to-ambient thermal resistance (θJA) isn't published, empirical data suggests junction temperatures could rise several degrees above ambient during prolonged operation. Designers should verify that total power dissipation (P = Icc × VCC + switching losses) stays well below maximum ratings, especially near 85°C ambient, to maintain stable propagation delay and prevent parametric shifts.
Is backward compatibility with older logic families assured when substituting the 74LCX38MTCX for legacy 74LS38 circuits?
Partial compatibility exists, but with caveats. The 74LCX38MTCX accepts lower input thresholds (0.7–0.8V for LOW, 1.7–2V for HIGH at 3.3V), making it more tolerant of noisy signals than LS-series inputs. However, LS gates expect higher input currents (~1.6mA), whereas LCX draws microamps. When driving an LS load, ensure output low voltage meets LS requirements (typically <0.5V); since the LCX38 can sink 24mA, this is achievable. Conversely, driving LCX inputs from LS outputs is straightforward due to voltage compatibility. Thus, bidirectional substitution is feasible in most cases, provided output loading doesn’t exceed specifications.
What precautions should be taken regarding simultaneous switching noise (SSN) when routing signals connected to the 74LCX38MTCX?
Simultaneous switching of multiple open-drain outputs can create transient ground bounce if return paths are poorly managed. Minimize loop area by placing decoupling capacitors (0.1µF ceramic) close to the VCC and GND pins. Route power and ground traces with adequate width to reduce impedance, and avoid splitting ground planes beneath the device. Since each active output sinks current momentarily, ensure local ground integrity to prevent voltage droop affecting adjacent logic levels. These measures help maintain signal integrity despite rapid transitions inherent to digital switching.
Can the 74LCX38MTCX be used in battery-powered devices where minimizing quiescent current is critical?
Yes, the 74LCX38MTCX consumes only up to 10µA of quiescent current across its entire operating range, making it highly efficient for low-power applications. Even with four channels active, average current draw remains negligible compared to many CMOS logic families that exhibit hundreds of microamps. However, note that each open-drain output draws additional current through its pull-up resistor when asserted low. Select resistor values carefully to balance sleep-mode efficiency against wake-up speed in microcontroller-driven systems.
Does the 74LCX38MTCX support Schmitt-trigger inputs for noise immunity in slow-changing signal environments?
No. The 74LCX38MTCX uses standard CMOS-compatible Schmitt-trigger inputs only in certain variants (e.g., 74LVCxx series). The LCX family implements conventional CMOS input stages without hysteresis. In noisy or slowly varying signal paths, external Schmitt triggers or comparator circuits should be added upstream if clean digital transitions are required. Alternatively, ensure input signals transition faster than the propagation delay to avoid metastability risks.

Parts with Similar Specifications

The three parts on the right have similar specifications to Fairchild Semiconductor 74LCX38MTCX

Product Attribute 74LCX38MTCX 74LCX38MTC 74LCX38MX 74LCX38MX
Part Number 74LCX38MTCX 74LCX38MTC 74LCX38MX 74LCX38MX
Manufacturer onsemi onsemi onsemi Fairchild Semiconductor
Input Logic Level - High - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Number of Circuits - - - -
Current - Quiescent (Max) - - - -
Number of Inputs - - - 2
Logic Type - - - -
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Input Logic Level - Low - - - -
Voltage - Supply - - - -
Features - - - Simultaneous Sampling
Base Product Number - DAC34H84 MAX500 ADS62P42
Current - Output High, Low - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Series - - - -
Max Propagation Delay @ V, Max CL - - - -
Mounting Type - Surface Mount Through Hole Surface Mount

Customers Also Interested in

Recommended Products

Customer Reviews

Evaluation: 10 Articles

  • Arch***ct
    Jul 15, 2026

    Used this device in a communication signal processing board. Stable timing and no unexpected issues during implementation.

  • FPGA***lorer88
    Jul 7, 2026

    The FPGA works properly and all functions operate as expected. Documentation required some additional research, but overall it is a usable device for smaller signal processing projects.

  • Nath***oleman
    Jun 29, 2026

    Used this sensor component in an industrial automation setup. Detection accuracy was consistent and installation was straightforward.

  • Emil***rperTech
    Jun 23, 2026

    Works exactly as described. I used it as a USB-to-SPI bridge in a small MCU development project and communication was stable from the first setup.

  • Liam***terTech
    Jun 15, 2026

    Used this CPLD in a logic control project. Programming was straightforward and signal timing matched the design requirements.

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

Write a Review

Your Email address will not be published.

Shipment

Delivery Time

In-stock items can be shipped within 24 hours. Some parts will be arranged for delivery within 1-2 days from the date all items arrive at our warehouse. And Allelco ships order once a day at about 17:00, except Sunday. Once the goods are shipped, the estimated delivery time depends on the shipping methods and Delivery destination. The table below shows are the logistic time for some common countries.

Delivery Cost

  1. Use your express account for shipment if you have one.
  2. Use our account for the shipment. Refer to the table below for the approximate charges.
(Different time frame / countries / package size has different price.)

Delivery Method

  1. Global Common Shipment by DHL / UPS / FedEx / TNT / EMS / SF we support.
  2. Others more shipping ways, please get in touch with your customer manager.

Common Countries Logistic Time Reference
Region Country Logistic Time(Day)
America United States 5
Brazil 7
Europe Germany 5
United Kingdom 4
Italy 5
Oceania Australia 6
New Zealand 5
Asia India 4
Japan 4
Middle East Israel 6
DHL & FedEx Shipment Charges Reference
Shipment charges(KG) Reference DHL(USD$)
0.00kg-1.00kg USD$30.00 - USD$60.00
1.00kg-2.00kg USD$40.00 - USD$80.00
2.00kg-3.00kg USD$50.00 - USD$100.00
Note:
The above table is for reference only. There may have some data bias for the uncontrollable factors.
Contact us if you have any questions.
  • QC (Quality Warranty)
  • Payment Support
  • Packaging
  • Certifications & Memberships

QC (Quality Warranty)

Allelco is committed to exceeding customer expectations through customer service excellence, order accuracy, and on-time delivery.
This is achieved through our commitment to the continual improvement of our processes, services, and products.


Strict quality inspection builds a solid foundation for electronic component quality.
  1. Visual inspection
  2. Performance testing and reliability verification
  3. Standardized full-process testing
  4. Precise control of every parameter
We eliminate defective components and ensure the stable operation of electronic devices through professional quality standards.
Quality Inspection
Quality Inspection Image - 01
Quality Inspection Image - 02
Quality Inspection Image - 03
Quality Inspection Image - 04

Payment Support

The payment method can be chosen from the methods shown below: Wire Transfer (T/T, Bank Transfer), Western Union, Credit card, PayPal.
  • HKBea
  • Paypal
  • MasterCard
  • Western-Union
  • VISA
Stable Delivery, Sincere Partnership — Your Faithful Supply Chain Partner
  • Efficient Supply Management
  • Cost-Saving Procurement
  • Fast Sourcing & Delivery
Contact us if you have any questions.

Packaging

Electrostatic Discharge Protection and Handling

All electrostatic-sensitive components are handled in accordance with electrostatic discharge control procedures. The products are hermetically sealed in anti-static safe packaging to prevent electrostatic damage. Appropriate labeling is also applied for identification and traceability. This ensures product integrity during storage, handling and transportation.


ESD

Certifications & Memberships

Third-party certified, strict quality control. Our certification
  • ISO 9001: 2015
  • ISO 13485: 2016
  • ISO 14001: 2015
  • ISO 28000: 2007
  • ISO 45001: 2018
  • GB/T 27922-2011
  • SMTA
  • IPC
  • ESD
  • PSMA
74LCX38MTCX Image

74LCX38MTCX

Fairchild Semiconductor
32D-74LCX38MTCX

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

Allelco
About Us
History
Certifications
Recruitment
Policies
Terms & Conditions
Privacy Policy
Cookie Policy
Services
Order Tracking
Return & Replacement
Frequently Asked Questions
Contact Us
Order
Shipping & Delivering
Payment Methods
My Account
The BlogsHot PartsChange LanguageNewsSite map
Contact Us
Headquarters Address:
Room C 13/F Harvard Commercial Building
105-111 Thomson Road Wan Chai
HongKong
Service Tel: +852-91464856
Service Email: info@allelco.com
Follow us
Copyright © 2012-2025 AllelcoElec.com. All rights reserved.
0 RFQ
Shopping cart (0 Items)
It is empty.
Submit RFQ
Compare List (0 Items)
It is empty.
Feedback

Your feedback matters! At Allelco, we value the user experience and strive to improve it constantly.
Please share your comments with us via our feedback form, and we'll respond promptly.
Thank you for choosing Allelco.

Subject
E-mail
Comments
Captcha
Drag or click to upload file
Upload File
types: .xls, .xlsx, .doc, .docx, .jpg, .png and .pdf.
Max file size: 10MB