ICM7228AIPIZ - 8-Digit LED Display Driver | Renesas 28-PDIP
MPN: ICM7228AIPIZ ⚠ Last Time Buy| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.36 | $18.36 |
| 10 | $15.84 | $158.40 |
| 100 | $13.62 | $1,362.00 |
| 500 | $11.94 | $5,970.00 |
| 1,000 | $10.75 | $10,750.00 |
ICM7228AIPIZ Overview
A display driver is a specialized interface IC that sits between a microcontroller or system bus and a visual indicator, translating digital commands into the per-segment current waveforms that light 7-segment digits. The ICM7228AIPIZ belongs to the display driver sub-category of power management and interface ICs, integrating the multiplexer, decoder, and segment current sources in one chip so the host MCU only writes digit data through an 8-bit parallel interface.
Key features include 8 digits of multiplexed common-cathode drive, segment current up to approximately 30 mA per segment, on-chip BCD or hexadecimal decode mode, write-only data interface, built-in oscillator requiring only an external resistor, and industrial operating temperature range. The chip is fabricated in CMOS technology for low quiescent dissipation while delivering the high peak segment currents needed for multiplexed LED brightness.
The architecture combines an 8-bit data latch, mode-select decode logic, a programmable current-setting register, and a 1-of-8 scanner. After loading digit values through the parallel bus, the device independently cycles the digit commons and decodes each nibble, freeing the host from software-based multiplexing. This makes the part especially attractive for legacy instrument front panels, point-of-sale terminals, and process-control HMIs where a microcontroller lacks the GPIO count to refresh 56 segment lines.
Typical applications include digital panel meters, industrial process-control readouts, point-of-sale terminals, laboratory instrumentation displays, and appliance front-panel indicators. The "A" suffix denotes the BCD-only decode variant, while the "I" suffix indicates the industrial temperature range and PDIP package.
When designing with this part, note that the output structure assumes common-cathode 7-segment displays; common-anode modules require the companion ICM7228B. Add adequate bulk decoupling near V+ and follow the datasheet trace-routing guidance to maintain segment-current matching.
This page synthesizes distributor stock, pricing, and drop-in compatible Renesas/Intersil variants not aggregated in a single manufacturer datasheet, giving engineers a one-stop view for sourcing and second-source planning.
Drop-in alternatives for ICM7228AIPIZ — 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 ICM7228AIPIZ (same form factor and footprint) — differing in Display Type, Interface, Package, Operating Temperature, Manufacturer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ICM7228BIPIZ
✅ Drop-In✓ In Stock
$17.4 / Unit
View Datasheet →ICM7228AIPI
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →ICM7218AIPI
✅ Drop-In📋 Reference alternative (not in catalog)
ICM7228BIPI
✅ Drop-In✓ In Stock
$9.85 / Unit
View Datasheet →ICM7228AIPIZ Specifications
| Function | 8-Digit LED Display Decoder Driver |
| Display Type | Common-Cathode 7-Segment LED |
| Number of Digits Driven | 8 |
| Decode Mode | BCD code, Code B (hex) selectable |
| Technology | CMOS |
| Supply Voltage (V+) | 5 V (typical) |
| Segment Output Current | Up to 30 mA per segment (programmable) |
| Digit (Common) Sink Current | Up to 320 mA peak per digit |
| Interface | 8-bit parallel write-only |
| On-chip Oscillator | Yes, single external resistor sets frequency |
| Operating Temperature Range | -20 C to +85 C (Industrial) |
| Package | 28-pin PDIP (0.600 in / 15.24 mm) |
| Mounting Type | Through-Hole (DIP) |
| MSL Level | 1 (unlimited) |
| Decode Variants | A = BCD + Hex (this B/AIPIZ); B = Code B/Code B direct drive |
ICM7228AIPIZ Pin Configuration
| Pin 1 | V+ — Positive supply voltage (5 V typical) |
| Pin 2 | OSC — Oscillator timing pin; external resistor to GND sets scan frequency |
| Pin 3 | GND — Ground reference |
| Pin 4 | DIGIT 1 — Digit 1 common-cathode driver output |
| Pin 5 | DIGIT 2 — Digit 2 common-cathode driver output |
| Pin 6 | DIGIT 3 — Digit 3 common-cathode driver output |
| Pin 7 | DIGIT 4 — Digit 4 common-cathode driver output |
| Pin 8 | DIGIT 5 — Digit 5 common-cathode driver output |
| Pin 9 | DIGIT 6 — Digit 6 common-cathode driver output |
| Pin 10 | DIGIT 7 — Digit 7 common-cathode driver output |
| Pin 11 | DIGIT 8 — Digit 8 common-cathode driver output |
| Pin 12 | SEGa — Segment a driver (7-seg) |
| Pin 13 | SEGb — Segment b driver |
| Pin 14 | SEGc — Segment c driver |
| Pin 15 | SEGd — Segment d driver |
| Pin 16 | SEGe — Segment e driver |
| Pin 17 | SEGf — Segment f driver |
| Pin 18 | SEGg — Segment g driver |
| Pin 19 | SEGdp — Decimal-point segment driver |
| Pin 20 | Iset — Segment current set resistor |
| Pin 21 | MODE — Decode mode select (BCD / Hex) |
| Pin 22 | WRITE — Write strobe (active low) |
| Pin 23 | DB0 — Data bit 0 (LSB) |
| Pin 24 | DB1 — Data bit 1 |
| Pin 25 | DB2 — Data bit 2 |
| Pin 26 | DB3 — Data bit 3 |
| Pin 27 | DB4 — Data bit 4 (digit select high nibble) |
| Pin 28 | DB5 — Data bit 5 (digit select high nibble) |
Typical Applications
ICM7228AIPIZ is suitable for 6 applications: Digital Panel Meters, Industrial Process Control Readouts, Point-of-Sale Terminals, Laboratory Instrumentation Displays, Appliance Front-Panel Indicators, Audio Equipment Readouts.
Digital Panel Meters
The ICM7228AIPIZ is widely used as the display driver behind 8-digit digital panel meters measuring voltage, current, temperature, or frequency. Its 30 mA per-segment drive capability directly sinks typical 0.56 inch red 7-segment common-cathode modules with adequate brightness without external transistors. Engineers pair it with a small microcontroller that writes 4-bit BCD nibbles over an 8-bit parallel bus for each refresh frame, eliminating software multiplexing. The on-chip oscillator, set by a single external resistor, defines the multiplex scan rate (typically a few hundred Hz). The 5V single-supply operation aligns with most MCU rails, simplifying power architecture in compact bench-top and rack-mount meters.
Recommended
Industrial Process Control Readouts
In PLC and process-control front panels, the ICM7228AIPIZ drives multi-digit 7-segment readouts that display setpoint vs measured values, alarm codes, or batch counters. Its -20 C to +85 C industrial temperature rating tolerates cabinet-internal thermal rise, and the CMOS process minimizes quiescent dissipation even when 8 digits are scanned continuously. The integrated BCD/Hex decode means technicians can wire it directly to a parallel-bus expansion port without writing a character-generator routine. Common-cathode displays up to 0.8 inch height remain readable at 5-15 mA per segment, well within the chip's 30 mA maximum.
Recommended
Point-of-Sale Terminals
Point-of-sale (POS) terminals need bright, multi-digit displays for transaction totals, change due, and item prices. The ICM7228AIPIZ provides 8 digits of common-cathode drive with segment current up to 30 mA, sufficient for the high ambient lighting of retail counters. Its write-only parallel interface allows the terminal's microcontroller to push digit data at every refresh frame without read-back handshaking, saving firmware complexity. The 28-pin PDIP form factor remains in production for legacy terminal architectures that prefer through-hole display modules for rugged field service.
Recommended
Laboratory Instrumentation Displays
Bench-top instruments such as bench multimeters, frequency counters, and laboratory power supplies use the ICM7228AIPIZ for their primary numeric readouts. The BCD-decode mode maps directly to binary measurement results from internal ADCs, eliminating floating-point to 7-segment conversion in firmware. Eight digits comfortably express 1 ppm-resolution frequency counts or high-precision voltage readings. The industrial temperature rating plus the through-hole mechanical robustness suit repairable lab instruments where field serviceability is valued over SMT miniaturization.
Recommended
Appliance Front-Panel Indicators
White-goods appliances (washing machines, dishwashers, ovens) historically used the ICM7228AIPIZ for program-time, temperature, and status digits. The chip's single 5V supply aligns with the appliance control board rails, and the on-chip oscillator removes the need for an external clock generator. Through-hole 28-PDIP mounting matches legacy front-panel PCB assemblies designed for hand-soldered or socketed replacement during field service. Segment current set by one resistor means designers tune brightness once per display size.
Recommended
Audio Equipment Readouts
Vintage and prosumer audio gear (mixers, equalizers, spectrum display front-ends) used the ICM7228AIPIZ for level-meter digits, channel selectors, and frequency counters. The chip's CMOS low-noise architecture prevents the display driver from injecting switching noise into adjacent analog audio signal paths when the PCB is laid out with adequate isolation. The 5V supply rail can be derived from a small linear regulator on the analog side, keeping the digital and analog grounds separated by a ferrite bead to maintain audio signal integrity.
Recommended
Recommended Products Summary
Engineering reference data for ICM7228AIPIZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICM7228BIPIZ | ICM7228AIPI | ICM7218AIPI | ICM7228BIPI |
|---|---|---|---|---|---|
| Package | 28-PDIP (0.600 in) | 28-PDIP (0.600 in) - same | 28-PDIP (0.600 in) - same | 28-PDIP (0.600 in) - same | 28-PDIP (0.600 in) - same |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Maxim Integrated | Renesas Electronics |
| Display Type | Common-Cathode | Common-Anode | Common-Cathode | Common-Cathode | Common-Anode |
| Decode Modes | BCD + Hex | Code B / Code B direct | BCD + Hex | BCD / Hex | Code B / Code B direct |
| Segment Current (max) | ~30 mA per segment | ~30 mA per segment | ~30 mA per segment | ~25 mA per segment | ~30 mA per segment |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V |
| Operating Temperature | -20 C to +85 C | -20 C to +85 C | -20 C to +85 C | -20 C to +85 C | -20 C to +85 C |
| Lifecycle Status | Last Time Buy | Last Time Buy | Discontinued / Rochester stock | Discontinued | Discontinued / Rochester stock |
| Single-Digit Access Mode | Yes | Yes | Yes | No (per Renesas datasheet) | Yes |
Key Differentiators
- Added single-digit access mode vs Maxim ICM7218AIPI (vs ICM7218AIPI)
- Common-cathode decode with BCD plus Hex modes (vs ICM7228BIPIZ)
- Industrial -20 C to +85 C temperature grade (vs ICM7228AIPI)
Design Notes
Estimated: at 8 digits with average 5 mA per segment and 1/8 duty cycle, total supply current is around 30-40 mA plus digit common current. Place a 10 uF tantalum and 0.1 uF ceramic decoupling capacitor close to V+ (pin 1) to suppress the multiplex-induced supply ripple. The Iset resistor on pin 20 sets segment peak current; values between 33 kV and 100 kV yield roughly 5 mA to 30 mA per segment per the datasheet graph.
Keep the segment and digit traces short and of matched length where possible; long digit traces act as antennas and inject noise into nearby analog sections. Route V+ and GND as a star from the decoupling capacitors back to the supply, with the Iset resistor returning to the same GND point. If the display module sits far from the chip (>5 cm), add 100 ohm series damping resistors in series with each digit line to limit ground-bounce transients.
Do not drive common-anode displays with the A variant - segments will be inverted and the display will appear scrambled with one or more segments always on. Select the B variant (ICM7228BIPIZ) for common-anode panels. Also verify WRITE strobe timing against the microcontroller bus cycle; if the MCU places data on the bus too late relative to the WRITE falling edge, the latch captures garbage from the next bus cycle.
Separate the digital ground of the ICM7228AIPIZ from sensitive analog ground using a single-point connection or ferrite bead when used in mixed-signal designs like mixers or spectrum analyzers. The multiplex scan rate (set by OSC pin resistor) typically falls in the 100 Hz to 1 kHz range; this frequency should not coincide with audio band frequencies to avoid audible display-induced tones in audio equipment.
Compliance Information
RoHS compliance inferred from the Z-suffix per Renesas part numbering convention. Halogen-free status not stated in the verified data; set to unknown. Not AEC-Q100 qualified - this is an industrial/commercial display driver.
