MM5451YN - 35-Output LED Display Driver DIP-40 | Microchip
MPN: MM5451YN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.62 | $4.62 |
| 10 | $4.16 | $41.60 |
| 100 | $3.71 | $371.00 |
| 500 | $3.34 | $1,670.00 |
| 1,000 | $2.98 | $2,980.00 |
MM5451YN Overview
An LED display driver is a dedicated power-management interface IC that sits between a digital controller (microcontroller, FPGA, or logic) and an LED load. In the display-driver hierarchy, the MM5451YN belongs to the non-multiplexed, directly driven class of LED drivers: each output sinks current continuously, so no multiplexing timing is required from the host and no external driver transistors are needed for typical segment loads.
The MM5451YN is fabricated in an N-channel, metal-gate MOS process producing low-threshold enhancement-mode and ion-implanted depletion-mode devices. Its headline features are 35 open-drain-style current-sinking outputs, a serial data interface requiring only clock and data lines, and a single-pin brightness control: one external variable resistor from the brightness pin to the supply sets a reference current that scales all 35 outputs simultaneously.
Because the part is non-multiplexed, each output runs at continuous duty cycle, giving maximum instantaneous brightness per segment and eliminating multiplex flicker. The 500 kHz-class serial clock rate allows a full 35-bit shift-register update in well under 100 microseconds, fast enough for animation on large bar-graph and status panels. Output capability is specified around 1.8V output voltage at 2.7 mA per output per FindIC's summary of the Micrel datasheet; for higher-current operation the datasheet output ratings should be consulted.
Typical applications include industrial panel meters, instrumentation annunciator and bar-graph displays, appliance and white-goods LED indicators, elevator and HVAC status boards, and vending or kiosk front panels - anywhere a static LED array of up to 35 points must be driven from a small microcontroller with minimal pin count.
A key design consideration: because the MM5451YN is not multiplexed, total package power dissipation scales directly with the number of lit segments and the per-segment current set by the brightness resistor, so thermal budgeting on the DIP-40 package is essential at high duty cycles.
This page adds value beyond the datasheet by synthesizing distributor pricing, drop-in alternative analysis against the MM5450 and ST M5451 families, and practical design notes in one place.
Drop-in alternatives for MM5451YN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MM5451YN (same form factor and footprint) — differing in Brightness Control, Interface, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MM5451BN
✅ Drop-In📋 Reference alternative (not in catalog)
MM5450YN
✅ Drop-In✓ In Stock
$3.53 / Unit
View Datasheet →MM5450BN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
M5451B7
✅ Drop-In📋 Reference alternative (not in catalog)
MM5451YN Maximum Ratings & Electrical Characteristics
| Function | LED Display Driver |
| Output Channels | 35 |
| Supply Voltage Range | 4.75 V to 11 V |
| Interface | Serial (clock + data) |
| Display Type | LED, non-multiplexed direct drive |
| Output Voltage | 1.8 V |
| Output Current | 2.7 mA |
| Switching Frequency | 500 kHz |
| Brightness Control | Single-pin, external variable resistor sets reference current |
| Process Technology | N-channel metal-gate MOS |
| Package | 40-DIP (0.600 in, 15.24 mm) |
| Mounting Type | Through Hole |
MM5451YN 40-dip (0.600 in, 15.24 mm) Pin Configuration Guide
Pin configuration for MM5451YN (40-dip (0.600 in, 15.24 mm) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for MM5451YN.
Refer to the datasheet for full pin configuration.
Typical Applications
MM5451YN is suitable for 6 applications: Industrial Panel Meters and Annunciators, Bar-Graph Level Indicators, Appliance and White-Goods Front Panels, Elevator and HVAC Status Boards, Vending Machines and Kiosk Front Panels, Test and Measurement Front-Panel Indicators.
Industrial Panel Meters and Annunciators
The MM5451YN fits industrial panel instrumentation because its 4.75V to 11V supply range absorbs rail variation common on control panels, while its two-wire serial interface lets a small microcontroller drive up to 35 indicators without port expansion. The non-multiplexed outputs hold constant current through every lit segment, giving steady, flicker-free annunciation that is easy to read at distance and on camera. With 35 channels, a single device covers a 4-digit 7-segment readout plus decimal points and alarm flags. Designers should budget package dissipation from the number of simultaneously lit segments and the current set by the single brightness resistor, since continuous-duty static drive dissipates more power than multiplexed schemes at the same perceived brightness.
Recommended
Bar-Graph Level Indicators
A 35-output, non-multiplexed driver is a natural fit for bar-graph level displays - audio VU meters, tank-level indicators, and process loop bargraphs - because each of the 35 segments maps to one driver output with continuous duty cycle, producing uniform segment brightness with no scan artifacts. The single-pin brightness control sets the reference current for all outputs at once, so a front-panel potentiometer gives calibrated, flicker-free dimming across the whole bar without firmware changes or PWM timing. Updates via the serial interface complete a full 35-bit frame quickly at the part's clock capability, supporting smooth animated level indication. Because all segments below the level point may be lit simultaneously, verify total package power dissipation on the DIP-40 through-hole package and provide adequate copper or airflow for full-scale indications.
Recommended
Appliance and White-Goods Front Panels
Appliance control boards - ovens, washing machines, refrigerators - need many status LEDs and a few numeric digits driven from a low-cost microcontroller. The MM5451YN serves this role with 35 outputs and only clock and data lines to the host, minimizing connector and harness cost between the user-interface board and the main controller. Its supply range of 4.75V to 11V tolerates unregulated or loosely regulated appliance supplies, and the analog single-pin brightness control supports the soft-dim night-mode behavior consumers expect, with no PWM flicker that could show up in product photography or video reviews. The through-hole DIP-40 package suits wave-soldered, serviceable consumer appliance PCBs where field repair and long mechanical part lives are design requirements.
Recommended
Elevator and HVAC Status Boards
Floor-indicator and HVAC status displays often require dozens of discrete LED points - floor numbers, arrow indicators, and fault flags - driven reliably for decades. The MM5451YN addresses this with 35 static outputs, eliminating multiplex timing from the host and removing the flicker and uneven-brightness artifacts of scanned displays, which matters in continuously operating building equipment viewed from a distance. The 4.75V to 11V supply tolerance copes with building control supply variation, and continuous-duty drive gives each lit point maximum instantaneous brightness without peak-current stress on the LEDs. The serial interface allows one controller to update the board over simple wiring, and the DIP-40 through-hole package supports the high-reliability, repairable construction typical of elevator and building-automation hardware.
Recommended
Vending Machines and Kiosk Front Panels
Unattended retail equipment uses arrays of LEDs for selection buttons, price displays, and service flags. The MM5451YN drives 35 points from a single serial-interface driver, so a low-pin-count controller can illuminate an entire selection-panel matrix without charlieplexing complexity or multiplex firmware. Static drive means every lit selection LED shows constant brightness regardless of how many others are active - a visible quality advantage over scanned designs on glossy kiosk fascias. Brightness is adjusted globally with one resistor, letting operators tune panel visibility for brightly lit store environments versus dim lobbies. Designers should derate total lit-segment current against the DIP-40 package thermal capability, and the 4.75V to 11V input range accepts the loosely regulated internal supplies typical of vending electronics.
Recommended
Test and Measurement Front-Panel Indicators
Bench instruments and rack equipment need dependable status and range indication that never flickers during acquisition - exactly what the MM5451YN's non-multiplexed, continuously driven 35 outputs deliver. Range LEDs, limit flags, and a small numeric readout fit within one device, addressed over a simple serial link from the instrument's microcontroller. The analog single-pin brightness scheme produces no PWM switching artifacts that could radiate into sensitive analog front ends, an advantage over PWM-dimmed LED drivers in precision measurement products. The 4.75V to 11V supply range integrates with classic instrument rails, and the through-hole DIP-40 package suits the serviceable, long-lifecycle construction expected of laboratory equipment. Total dissipation scales with lit segments, so check package power at worst-case full-panel indication.
Recommended
Recommended Products Summary
Engineering reference data for MM5451YN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MM5451BN | MM5450YN | MM5450BN | M5451B7 |
|---|---|---|---|---|---|
| Package | 40-DIP (0.600, 15.24mm) | 40-DIP - same footprint | 40-DIP (0.600, 15.24mm) - same footprint | 40-DIP - same footprint | 40-DIP - same footprint |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | STMicroelectronics |
| Output Channels | 35 | 35 | 34 | 34 | 35 |
| Interface | Serial | Serial | Serial | Serial | Serial |
| Brightness Control | Single-pin resistor | Single-pin resistor | Single-pin resistor | Single-pin resistor | Single-pin resistor |
| Drive Type | Non-multiplexed, continuous | Non-multiplexed, continuous | Non-multiplexed, continuous | Non-multiplexed, continuous | Non-multiplexed, continuous |
| Process Technology | N-channel metal-gate MOS | N-channel metal-gate MOS | N-channel metal-gate MOS | N-channel metal-gate MOS | N-channel silicon-gate MOS |
Key Differentiators
- Full 35-output channel count (vs MM5450YN)
- True drop-in cross-brand equivalent exists (vs M5451B7)
- Analog single-pin dimming with zero flicker (vs MM5451BN)
Design Notes
Estimated: because the MM5451YN is non-multiplexed, package dissipation equals the sum of (output headroom voltage x set current) over all lit segments. With, for example, 20 segments lit at 2.7 mA and roughly 1.8 V output headroom, dissipation is about 20 x 2.7 mA x 1.8 V = 97 mW - modest, but at higher per-output currents or more lit segments the DIP-40 through-hole thermal resistance becomes the limiting factor. Compute worst-case dissipation from your actual segment count and brightness resistor setting before finalizing the layout.
Set the per-channel current with the single external variable resistor from the brightness pin to the supply - this one component scales all 35 outputs, so use a stable, low-tempco resistor (or a fixed resistor plus trimmer) for repeatable brightness. Do not exceed the 11V maximum supply. When substituting the MM5450YN, remember it has only 34 outputs: the 35th segment will be unaddressable. Verify LED string voltage plus output headroom stays within supply budget so sinks remain in regulation.
For the through-hole DIP-40, provide a solid ground path to the LED return network and keep the serial clock and data traces short and away from LED current loops to avoid clock glitches that would corrupt the shift register. Place a 0.1 uF ceramic decoupling capacitor close to the supply pin. If the panel is large, consider a small ground plane section under the driver to reduce ground bounce between LED return currents and the logic interface.
Compliance Information
Compliance status was not stated in the provided web data. Confirm RoHS/REACH status on the Microchip product page or distributor listing before procurement.
