MC145026D - 9-Line CMOS Encoder IC | NXP | 16-SOIC
MPN: MC145026D ✗ סוף ייצורMC145026D סקירה
A remote-control encoder IC is part of the broader interface and logic semiconductor hierarchy used to convert physical switch or control states into a compact serial signal. The MC145026D is intended for use with the MC145027 decoder family, allowing an encoded command or access-code word to be transmitted over a wired link and recovered by a compatible receiving circuit. Its repeated transmission behavior increases security by making the received word more resistant to simple single-event transmission errors.
The encoder accepts a transmit-enable input to initiate a serial encoding sequence. During normal operation, the nine input pins can represent individual control functions such as multiple button states, access-code positions, or discrete logic conditions. The trinary mode is especially useful for systems that need more than binary combinations, while binary mode can simplify the interface when each control line is restricted to two valid states.
The MC145026D is a dedicated encoder rather than a general-purpose microcontroller or communication transceiver. It does not require firmware, and its function is determined by the electrical state of the input pins and the transmit-enable control. This makes it suitable for simple, compact remote-control systems, keypad-based access devices, industrial control panels, and security-related key-entry modules where a hardware encoder is preferable to a programmable controller.
As a legacy CMOS logic device, the principal design considerations are operating voltage compatibility, input-state definitions, timing around the transmit-enable signal, and correct receiver pairing. The MC145026D should be used with an appropriate MC145027-family decoder and verified against the NXP datasheet for pin functions, electrical timing, and operating conditions. The part’s documented lifecycle status is obsolete, so new designs should confirm availability and consider a supported alternative before committing to a production release.
This page consolidates the manufacturer’s functional description, package information, application guidance, and replacement considerations into a design-focused reference for engineers evaluating the MC145026D in legacy remote-control systems.
חלופות תחליף ישיר עבור MC145026D — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
אין חלופות תואמות Drop-in עבור מוצר זה.
בקשת חלופותMC145026D דירוגים מרביים ומאפיינים חשמליים
| Product Type | CMOS encoder IC |
| Manufacturer | NXP Semiconductors |
| פונקציה | Nine-line encoder and serial transmitter |
| Number of Information Lines | 9 lines |
| Input Encoding | Trinary or binary |
| Trinary Input States | Low, high, or open |
| Binary Input States | Low or high |
| Possible Trinary Codes | 19,683 codes |
| Transmit Control | Active-low transmit-enable input |
| Transmission Security Feature | Each word transmitted twice per encoding sequence |
| מארז | 16-SOIC (0.295 inch, 7.50 mm width) |
| Terminal Count | 16 terminals |
| סוג הרכבה | Surface mount |
| Package Shape | Rectangular |
| Terminal Form | Gull wing |
מדריך תצורת פינים של MC145026D rectangular
תצורת פינים עבור MC145026D (מארזת rectangular). מעגל משולב דיגיטלי זה כולל GPIO, ממשקי תקשורת (UART, SPI, I2C) ופיני מתח. יש לעיין בגיליון הנתונים של היצרן לפונקציות פינים חלופיות ולאפשרויות תצורה. חיוני לתכנון מערכות משובצות ולפריסת PCB.
אין נתוני פריסת פינים מפורטים עבור MC145026D.
עיינו ב- גיליון נתונים עבור תצורת פינים מלאה.
יישומים טיפוסיים
MC145026D מתאים עבור 6 יישוםs: Remote-Control Transmitter, Access-Code Keypad, Security Code Transmitter, Industrial Control Panel Interface, Sequential Code Entry Module, Legacy Equipment Service Interface.
Remote-Control Transmitter
The MC145026D fits a hardware remote-control transmitter because it converts nine control inputs into a serial encoded word using the protocol expected by an MC145027-family receiver. A designer can assign low, high, or open states to the input lines in trinary operation, or use only low and high in binary operation. The NXP datasheet states that each word is transmitted twice per encoding sequence, which improves robustness against isolated transmission errors. The transmitter should include clean switch contacts or logic levels, defined transmit-enable control, and a receiver designed for the same coding and timing conventions.
מומלץ
Access-Code Keypad
The MC145026D can serve as the encoding element of an access-code keypad when the mechanical keypad requires several independently encoded positions. Its nine inputs support trinary coding, producing up to 19,683 possible combinations, which provides more flexibility than a simple binary button matrix. The practical implementation must define how key contacts generate low, high, or open states and must prevent ambiguous or floating conditions. Pair the encoder with an appropriate receiver and validate code behavior across all valid and invalid input combinations.
מומלץ
Security Code Transmitter
The MC145026D is appropriate for a legacy security-code transmitter because the repeated transmission of each encoded word increases system robustness compared with sending a word only once. Its nine-line input structure can represent a user-defined access sequence or several control states. The security benefit comes from the encoding and repetition scheme rather than cryptographic protection, so sensitive systems still need appropriate physical and electrical safeguards. Receiver-side validation and controlled access to the programming process remain important design requirements.
מומלץ
Industrial Control Panel Interface
The MC145026D can be used in a small industrial control panel where discrete selector positions, keys, or limit states must be conveyed over a wired serial link. The nine inputs provide a compact hardware interface, while binary operation simplifies design when every signal has only two valid states. Because the encoder has no firmware, it can provide deterministic operation in simple control panels. Engineers should add pull networks or other defined levels where switch wiring could float, isolate long external wiring from sensitive logic, and verify the complete transmitter-receiver timing at the intended cable length.
מומלץ
Sequential Code Entry Module
The MC145026D is suitable for a sequential code-entry module in which multiple positions must be encoded into one serial transmission. Trinary operation allows each position to carry low, high, or open information, while the complete nine-line word can represent a larger code space than a set of simple binary switches. The circuit should mechanically constrain or electrically constrain the code mechanism, as the IC encodes states rather than independently authenticating the user. A matching receiver and application-level validation are required for reliable code recognition.
מומלץ
Legacy Equipment Service Interface
The MC145026D can support a service interface in legacy equipment where an existing encoder board must be diagnosed, repaired, or replicated. Its fixed hardware encoding behavior makes the IC useful when recreating a known transmitter rather than designing a new user interface. The replacement board must preserve the original pin connections, input logic states, transmit-enable behavior, and receiver protocol. Before using the device in new production, confirm lifecycle status and obtain a formal sourcing response for the exact MC145026D ordering code and package.
מומלץ
נתוני עזר הנדסיים עבור MC145026D — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
מבדילים עיקריים
- Dedicated nine-line hardware encoder (לעומתMC145027P)
- Expanded trinary code space (לעומתMC145027P)
- Repeated word transmission (לעומתMC145027P)
הערות תכנון
Use the NXP MC145026 datasheet pin-description table to assign the 16-SOIC connections before PCB routing. Keep the nine encoder-input traces away from the serial output and transmit-enable traces where practical. A ground reference and short return paths will help maintain valid logic levels in equipment containing long switch wiring or switching power converters.
Do not treat the open input state as an ordinary logic high. The MC145026D supports low, high, and open states in trinary operation, so an unintended floating input can change the encoded word. Ensure every input has a deliberate electrical state, and verify the actual switch or resistor network against the selected binary or trinary coding scheme.
Account for the transmit-enable polarity and serial timing specified by the NXP datasheet. If the encoder is mounted near a relay, motor drive, or switching supply, route the serial link away from switching nodes and provide a stable return path. Receiver compatibility should be checked with the intended cable and termination arrangement rather than only at bench length.
מידע על תאימות
Compliance information is not stated in the manufacturer document or product listings available for this legacy part. Confirm current environmental and quality documentation with the manufacturer before new production use.
