Renesas ICM7555IBA

Overview

ICM7555IBA from Renesas Electronics is a CMOS general-purpose timer IC, pin-compatible with the classic NE555 but offering superior low-power operation, wide 2V–18V supply range, and sub-20pA input currents. It functions as a precision monostable or astable oscillator, delivering accurate time delays from microseconds to hours in industrial control, sensor timing, and power sequencing circuits.

For engineers reviewing the ICM7555IBA datasheet, ICM7555IBA pinout, ICM7555IBA application, or ICM7555IBA equivalent, key selection criteria include its guaranteed -25°C to +85°C operating range, 60µA typical supply current at 15V, 1MHz max oscillation frequency, and SOIC-8 RoHS-compliant packaging - all critical for battery-powered and thermally demanding embedded designs.

Technical Context

The ICM7555IBA implements a dual-comparator + SR flip-flop architecture with high-impedance CMOS inputs, enabling stable operation without Control Voltage decoupling. Its internal comparators feature precisely ratioed thresholds (1/3 VDD and 2/3 VDD) and ultra-low trigger/threshold currents (≤10nA), allowing use with high-value RC networks for long-duration timing.

Unlike bipolar 555 timers, it eliminates supply crowbarring during output transitions, reducing supply current spikes from ~400mA to <3mA and eliminating mandatory local bypass capacitors. Reset dominates all inputs, and output drivers source/sink sufficient current (≥0.8mA/20mA) to directly drive TTL or CMOS logic loads.

Key Specifications

Pinout & Package

ICM7555IBA is housed in an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, Renesas pkg code M8.15), RoHS-compliant, with 1.27mm lead pitch and 5.00mm × 4.00mm body dimensions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar timer IC applications.

Compared with TLC555CP and NE555P, the ICM7555IBA delivers 6× lower supply current, 2× wider temperature range, and SOIC-8 packaging - making it the optimal choice for modern, space-constrained, battery-operated, and industrial-grade timing systems.

Availability

ICM7555IBA is available at Aetrix Electronics and suitable for industrial control, sensor interface, and power management applications requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ICM7555IBA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and IoT markets.

The ICM7555IBA belongs to Renesas' precision timing IC portfolio, engineered specifically for low-power, high-accuracy RC-based timing in harsh environments where legacy 555 reliability and simplicity are required alongside modern efficiency.

FAQ

What is the operating temperature range of the ICM7555IBA?

The ICM7555IBA is rated for operation from -25°C to +85°C, as confirmed in the FN2867 Rev.10.01 datasheet under "Operating Conditions". This extended industrial temperature range distinguishes it from commercial-grade variants like the ICM7555CBAZ (0°C to +70°C) and makes the ICM7555IBA suitable for deployment in outdoor equipment, factory automation, and automotive under-hood modules where thermal resilience is critical.

Does the ICM7555IBA require a decoupling capacitor on the VDD pin?

No, the ICM7555IBA does not require a dedicated VDD decoupling capacitor in most applications. Its CMOS architecture eliminates the large supply current transients ("crowbarring") seen in bipolar 555 timers, limiting supply spikes to just 2–3mA versus 300–400mA. The FN2867 datasheet explicitly states that supply decoupling is "normally not necessary", though a 100nF ceramic capacitor is still recommended for noisy environments or high-speed switching nearby. This applies directly to the ICM7555IBA.

Can the ICM7555IBA replace a standard NE555 in an existing design?

Yes, the ICM7555IBA is designed as a direct pin-compatible and function-compatible replacement for the NE555 in most applications. It uses identical SOIC-8 pinout, same trigger/reset thresholds (1/3 and 2/3 VDD), and supports both monostable and astable modes. However, due to its ultra-low input currents and absence of crowbarring, external capacitors on CONTROL VOLTAGE and VDD may be omitted - resulting in a true drop-in upgrade with potential BOM reduction. This equivalence is documented for the ICM7555IBA in the datasheet's "General Purpose Timers" introduction.

What is the maximum frequency achievable with the ICM7555IBA in astable mode?

The ICM7555IBA achieves a maximum free-running frequency of 1MHz under specified test conditions: VDD = 5V, RA = 470Ω, RB = 270Ω, and C = 200pF (per FN2867 Rev.10.01, Electrical Specifications table). This limit arises from internal propagation delays and comparator response times. For reliable operation, design margins recommend staying ≤800kHz. The 1MHz capability enables use in ultrasonic driver clocks, high-speed PWM, and digital signal conditioning - capabilities beyond standard NE555's ~100kHz ceiling.

Is the ICM7555IBA RoHS compliant and lead-free?

Yes, the ICM7555IBA is RoHS compliant and lead-free. The datasheet's "Ordering Information" table explicitly lists "RoHS Compliant" for the ICM7555IBAZ and ICM7555IBAZ-T variants, and Note 2 confirms the use of "100% matte tin plate plus anneal (e3 termination finish)" meeting RoHS requirements. The ICM7555IBA shares the same SOIC-8 package (M8.15) and material set, confirming full compliance. This ensures compatibility with Pb-free reflow soldering processes per IPC/JEDEC J-STD-020.