MM5450YN - 34-Output LED Display Driver, 40-PDIP | Microchip
MPN: MM5450YN ✓ NakahandaMM5450YN Ulas
An LED display driver is a dedicated power management IC that converts serial or parallel control data into per-segment constant or switched current outputs capable of directly driving LEDs. In the display-driver hierarchy, the MM5450 belongs to the non-multiplexed (direct-drive) class: each output drives one LED segment or lamp continuously, so no multiplex timing, no external transistors, and no refresh software are required. This contrasts with multiplexed drivers, which time-share fewer outputs across many digits.
Key features include 34 open-drain-style outputs that can each sink current for direct LED connection, continuous analog brightness control by setting a reference current through a single variable resistor connected to the supply, a simple serial data interface requiring only a clock and data line, and a data-enable input that gates output updates. The 500 kHz-class serial clock rate allows fast full-frame refresh of all 34 outputs.
The device is fabricated in an N-channel, metal-gate MOS process that produces low-threshold, enhancement-mode and ion-implanted depletion-mode devices, a mature process that yields robust, well-characterized output structures suited to long-life industrial displays.
Typical applications include industrial panel meters, instrument front-panel displays, elevator and equipment status indicators, vending-machine and appliance LED arrays, and any static LED lamp or 7-segment cluster where a microcontroller must drive many LEDs with minimal I/O pins - only two or three MCU lines are consumed regardless of LED count.
A key design consideration is output current setting: brightness is set globally through the single brightness pin resistor, so individual segment dimming is not possible; plan current-limiting resistors per output where segments of different colors share a display.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Mga alternatibo na pwedeng ilagay na MM5450YN — parehas na package, pin-to-pin na katugmang. Hindi kasama ang mga bahagi ng iba't-ibang package na nangangailangan ng pagpapaayos ng PCB.
Variante sa Seri na ito
Katulad na modelo sa serye na katugma sa pagpasok MM5450YN (parehas na form factor at footprint) — pagkakaiba sa Brightness Control, Interface, Package.
MM5451YN
✅ Drop-InMagkontak para sa presyo
Tingnan ang Datasheet →MM5450YV
✅ Drop-In📋 Alternatibo na Reference (hindi sa katalogo)
MM5450YN Mga Pinakamataas na Rating at Electrical Characteristics
| Fungsi | LED Display Driver |
| Bilang ng Outputs | 34 |
| Drive Topology | Non-multiplexed (direct drive) |
| Supply Voltage Range | 4.75 V to 11 V |
| Serial Clock Frequency | 500 kHz |
| Type ng Output | 1.8 V / 2.7 mA class outputs |
| Interface | Serial data input, no load signal required |
| Brightness Control | Continuous, single-pin (external resistor to supply) |
| Pin na Pinapayagan | Yes |
| Process Technology | N-channel metal-gate MOS |
| Packhaging | 40-PDIP (0.600 inch wide) |
| Uri ng Pagpapasok | Through Hole |
| Manufacturer Part Suffix | YN = 40-pin PDIP package |
Gabay sa Pin Configuration ng MM5450YN 40-pdip (0.600 inch wide)
Pin configuration para sa MM5450YN (40-pdip (0.600 inch wide) package). Ang power device na ito ay may gate, drain, at source terminals. Para sa mga non-polarized package, sumangguni sa datasheet ng manufacturer para sa eksaktong oryentasyon ng pin 1 at mga detalye ng footprint. Kasama sa mga karaniwang aplikasyon ang disenyo ng power supply, motor driving, at load switching.
Wala ng detalyadong pinout data na magagamit para sa MM5450YN.
Sumangguni sa datasheet para sa buong pin configuration.
Tipikal na mga Gamit
MM5450YN ay nararapat para sa 6 aplikasyons: Industrial Panel Meters, Instrument Front-Panel Status Indicators, Legacy Equipment Repair and Maintenance, Vending and Appliance LED Arrays, Elevator and Building Indicator Systems, Embedded Learning and Hobby Displays.
Industrial Panel Meters
The MM5450YN fits industrial panel meters because its 34 static outputs can drive four complete 7-segment digits with decimal points continuously, eliminating multiplex flicker that can corrupt optical sensor readings near the display. Its 4.75 V to 11 V supply range attaches directly to typical industrial 5 V or higher instrument rails without a dedicated regulator. Only two or three microcontroller I/O lines are consumed by the serial clock, data, and enable signals, leaving MCU bandwidth free for measurement tasks. The 500 kHz serial rate updates the entire 34-segment frame in well under a millisecond, so display refresh never bottlenecks the control loop.
Inirekomenda
Instrument Front-Panel Status Indicators
Equipment front panels often need 20-34 discrete LED indicators for alarms, status, and mode flags. The MM5450YN's non-multiplexed architecture drives each lamp continuously, so every indicator has uniform, stable brightness with no scan artifacts on camera or when viewed at an angle. Single-pin continuous brightness control lets a technician dim the panel with a trimmer resistor for dark control rooms or brighten it for factory floors without firmware changes. The enable pin permits blanking the entire panel during startup or fault conditions with one logic line, an important safety behavior in test and measurement instruments.
Inirekomenda
Legacy Equipment Repair and Maintenance
The MM5450YN remains one of the few non-multiplexed LED display drivers still in active production in a through-hole 40-DIP package, making it the standard repair part for legacy industrial controllers, elevator indicators, and test equipment designed around the original Micrel part. Replacement is a direct socket-in: identical pin map, supply range, and serial protocol preserve the original firmware. For boards where the original MM5450YN is unobtainable in small quantities, the MM5451YN serves as a near substitute, and sourcing through distributors such as DigiKey and LCSC keeps repair turnaround short as of 2026-10-16.
Inirekomenda
Vending and Appliance LED Arrays
Vending machines and white-goods control panels drive many discrete LEDs for price displays, selection buttons, and status annunciation. The MM5450YN consolidates all 34 lamp drivers into one 40-DIP IC, replacing dozens of discrete transistors and resistors and reducing BOM count and assembly cost. Its metal-gate MOS outputs are robust against the noisy, inductive-load environments typical of appliance solenoids and compressors, and the analog brightness trim adapts the same board to different enclosure aesthetics. Serial control means one cheap MCU handles both user interface and display, keeping total electronics cost low in price-sensitive consumer hardware.
Inirekomenda
Elevator and Building Indicator Systems
Floor indicators and hall-lantern arrays in elevators demand high reliability and 24/7 continuous duty. The MM5450YN's static drive eliminates refresh-dependent failure modes, and its mature N-channel metal-gate process has decades of field history in exactly this application class. The 11 V maximum supply suits systems with higher-voltage signaling rails, while the enable pin supports emergency-blank behavior required in some building codes. Because brightness is set by one resistor, installers can match display luminance to lobby lighting conditions on site. Its through-hole DIP package also simplifies field replacement by maintenance technicians without surface-mount rework equipment.
Inirekomenda
Embedded Learning and Hobby Displays
The through-hole 40-DIP package and two-wire serial interface make the MM5450YN ideal for breadboard prototyping and education. A student can drive 34 LEDs from any 5 V microcontroller with just clock, data, and enable lines - no multiplex timers, no driver transistors, no interrupt service routines. The analog brightness pin demonstrates reference-current concepts, and the 500 kHz clock tolerance teaches serial timing fundamentals. DIP packaging survives repeated insertion cycles that destroy surface-mount parts, and the extensive archived datasheet ecosystem from both Microchip and Micrel provides abundant reference material for coursework and hobby projects.
Inirekomenda
Buod ng mga Inirekomendang Produkto
Impormasyon ng Talumpati sa Engineering for MM5450YN — ikabit, gabay sa disenyo, at impormasyon ng pagsunod sa kautusan.
Paunawang Hanapin
Ikabit sa Mga Alternatibo
| Parametro | Ito ang Producto | MM5451YN | MM5450YV |
|---|---|---|---|
| Package | 40-PDIP | 40-PDIP - same | PLCC-44 (same die, different body) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology |
| Number of Outputs | 34 | 33 | 34 |
| Supply Voltage Range | 4.75 V to 11 V | 4.75 V to 11 V | 4.75 V to 11 V |
| Drive Topology | Non-multiplexed (static) | Non-multiplexed (static) | Non-multiplexed (static) |
| Brightness Control | Single-pin continuous analog | Single-pin continuous analog | Single-pin continuous analog |
| Mounting Type | Through Hole | Through Hole | Surface Mount |
| Serial Frame Difference | 34-output frame | 33-output frame (1 bit shorter) | Identical to MM5450YN |
Pangunahing mga Pagkakaiba
- One extra output channel (kumpara saMM5451YN)
- Through-hole 40-DIP availability (kumpara saMM5450YV)
- Static non-multiplexed drive (kumpara saMM5451YN (same class) and multiplexed modern drivers)
Talaan ng Disenyo
The MM5450YN accepts 4.75 V to 11 V, but output drive capability scales with supply. When driving many segments simultaneously at full brightness, total package power dissipation is the sum of per-output current times output voltage drop plus quiescent power - verify against the datasheet absolute maximum power rating for your specific supply and LED current configuration. Decouple VDD with a 0.1 uF ceramic capacitor placed within 10 mm of pin 1 to prevent serial-data corruption from LED switching transients on long boards.
Do not substitute the MM5451YN without firmware changes: its serial frame is one bit shorter (33 outputs vs 34), so a controller written for the MM5450 frame will misalign the output map by one bit, lighting the wrong segments. Similarly, the MM5450YV uses PLCC-44 pin numbering that is completely different from the DIP-40 despite identical silicon. Always re-verify the bit order (data format is per the manufacturer datasheet) when moving between family members.
As a through-hole DIP-40 on a 0.600-inch pitch, provide a socket for field-serviceable designs - a strong recommendation for industrial repair applications where this part is typically replaced, not reflowed. Route the 34 output traces with adequate spacing for the LED series resistors; since brightness is global, place the brightness-pin trimmer resistor at the panel edge for calibration access, keeping that analog node short and away from the serial clock line to avoid brightness jitter.
Impormasyon ng Pagsunod sa Kautusan
Compliance status not stated in the provided web data. As a mature metal-gate MOS product, verify RoHS/lead-free status on the current Microchip product page or certificate of conformance before specifying.
