CD4541BM - 20V CMOS Programmable Timer | Texas Instruments
MPN: CD4541BM ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.4392 | $0.44 |
| 10 | $0.4392 | $4.39 |
| 100 | $0.4392 | $43.92 |
| 500 | $0.4392 | $219.60 |
| 1,000 | $0.4392 | $439.20 |
CD4541BM Overview
A programmable timer is a timing and clock-management integrated circuit that generates repeatable delays or oscillation signals from external timing components. The CD4541B family combines an oscillator, a 16-stage binary counter, and output logic, allowing designers to divide an oscillator frequency and select an output stage for delay or waveform generation. Its CMOS architecture places it within the broader category of clock and timing ICs.
Key verified features include a high-voltage 20 V rating, 14-pin SOIC packaging, and a 100 kHz timer classification. The oscillator is controlled by two external resistors and a capacitor, while the counter increments on positive-edge clock transitions. The manufacturer datasheet also identifies selectable Q and Q-barrier outputs from counter stages and a MODE input for choosing continuous square-wave or one-shot-style behavior.
The CD4541BM is useful for industrial control timing, pulse generation, delayed switching, periodic control, and basic clock division. Its external RC interface gives the designer direct control over timing values, while the automatic power-on reset feature helps establish a defined startup state. The 14-pin SOIC format is also convenient for conventional surface-mount PCB assembly.
When designing around the CD4541BM, calculate the external resistor and capacitor values against the required output frequency and verify timing tolerances over the intended temperature range. Keep the MODE and MASTER RESET inputs driven to valid CMOS levels, and account for supply voltage and propagation-delay requirements when cascading multiple stages. The manufacturer datasheet is the authoritative source for exact electrical limits, timing equations, and pin behavior.
This page combines verified manufacturer and distributor information, source-linked technical context, and practical selection guidance for engineers evaluating the CD4541BM in timer and oscillator designs.
Drop-in alternatives for CD4541BM — 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 CD4541BM (same form factor and footprint) — differing in Mounting Type, Operating Temperature, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesCD4541BM Specifications
| Product Type | CMOS programmable timer |
| Voltage Rating | 20 V |
| Oscillator Classification | 100 kHz |
| Counter | 16-stage binary counter |
| Timing Components | 2 external resistors and 1 external capacitor |
| Operating Temperature | -55 °C to +125 °C |
| Package | 14-pin SOIC |
| Package Family | SOIC-14 surface-mount package |
| Mounting Type | Surface mount |
| Counter Output Stages | Q or Q-barrier outputs from counter stages |
| Output Modes | Continuous square wave or selected one-shot mode |
| Reset | Automatic power-on reset and MASTER RESET input |
| Input Type | CMOS |
| Technology | CMOS |
CD4541BM Pin Configuration
| Pin 1 | [DATA_NEEDED: pin 1 name] — [DATA_NEEDED: pin 1 function] |
| Pin 2 | [DATA_NEEDED: pin 2 name] — [DATA_NEEDED: pin 2 function] |
| Pin 3 | [DATA_NEEDED: pin 3 name] — [DATA_NEEDED: pin 3 function] |
| Pin 4 | [DATA_NEEDED: pin 4 name] — [DATA_NEEDED: pin 4 function] |
| Pin 5 | [DATA_NEEDED: pin 5 name] — [DATA_NEEDED: pin 5 function] |
| Pin 6 | [DATA_NEEDED: pin 6 name] — [DATA_NEEDED: pin 6 function] |
| Pin 7 | [DATA_NEEDED: pin 7 name] — [DATA_NEEDED: pin 7 function] |
| Pin 8 | [DATA_NEEDED: pin 8 name] — [DATA_NEEDED: pin 8 function] |
| Pin 9 | [DATA_NEEDED: pin 9 name] — [DATA_NEEDED: pin 9 function] |
| Pin 10 | MODE — Selects output operating mode according to the manufacturer truth table |
| Pin 11 | [DATA_NEEDED: pin 11 name] — [DATA_NEEDED: pin 11 function] |
| Pin 12 | [DATA_NEEDED: pin 12 name] — [DATA_NEEDED: pin 12 function] |
| Pin 13 | [DATA_NEEDED: pin 13 name] — [DATA_NEEDED: pin 13 function] |
| Pin 14 | [DATA_NEEDED: pin 14 name] — [DATA_NEEDED: pin 14 function] |
Typical Applications
CD4541BM is suitable for 6 applications: Industrial Periodic Control, Pulse and Delay Generation, Square-Wave Clock Source, Automatic Startup Sequencing, Motor and Actuator Timing, LED and Indicator Timing.
Industrial Periodic Control
The Texas Instruments CD4541BM fits periodic machine-control tasks because it combines an external-RC oscillator with a 16-stage binary counter and selectable outputs. Engineers can use the timing network to establish a repeatable base interval, select a counter stage for division, and drive a relay, indicator, or control input through appropriate interface circuitry. The 14-pin SOIC package supports conventional surface-mount assembly. Before deployment, verify supply limits, reset timing, output loading, and environmental requirements against the TI CD4541B datasheet.
Recommended
Pulse and Delay Generation
The CD4541BM is useful for pulse-width, delayed-switching, and one-shot-style functions because its counter and output logic can be programmed through MODE and output-stage selection. The oscillator supplies the timing reference, while the 16-stage counter divides that reference into longer intervals. In a control circuit, the output can trigger a driver stage rather than directly powering a high-current load. Confirm the exact timing equation, output polarity, and reset behavior in the manufacturer datasheet before setting component values.
Recommended
Square-Wave Clock Source
When MODE is set to logic 1, the CD4541BM can provide a continuous square wave according to the manufacturer description, with frequency based on the oscillator divided by 2N. This makes it suitable for clock division, periodic sampling triggers, and low-to-medium-frequency control waveforms. The external resistor-capacitor network determines the oscillator behavior, so validate timing tolerance and duty cycle at the intended voltage and temperature. The device should not be treated as a precision crystal oscillator.
Recommended
Automatic Startup Sequencing
The automatic power-on reset in the CD4541BM helps establish a defined state after power is applied, which is valuable in circuits that must not begin an output sequence from an indeterminate condition. The MASTER RESET input can also force the timer into a known state during system initialization or fault recovery. Designers should still define startup states for downstream logic and check the required reset pulse width and timing in the TI datasheet. The timer is best used for supervisory timing, not as the sole safety mechanism.
Recommended
Motor and Actuator Timing
The CD4541BM can provide delayed or periodic control signals for actuators where a fixed timing sequence is needed and the output current is below the timer’s permitted load. Its oscillator, counter stages, MODE input, and reset logic allow an external controller to trigger an operation after a programmable interval. Use an appropriate transistor or driver for motors, relays, solenoids, or other inductive loads, and account for isolation, flyback paths, and supply transients. Exact output-drive limits must be confirmed from the datasheet.
Recommended
LED and Indicator Timing
The CD4541BM is suitable for LED blink, periodic indication, and delayed warning functions because it can divide an oscillator frequency and provide selectable logic outputs. Its CMOS operation and low pin count make it convenient for small control boards, while the SOIC package supports automated assembly. A current-limiting resistor and suitable transistor or buffer should be used for the LED arrangement. Confirm the output voltage, current, duty cycle, and temperature performance in the manufacturer documentation.
Recommended
Recommended Products Summary
Engineering reference data for CD4541BM — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CD4541BC | CD4541BT | CD4541BM96 | CD4541BE | MC14541BCPG |
|---|---|---|---|---|---|---|
| Product Type | CMOS programmable timer | CD4541-family CMOS programmable timer | CD4541-family CMOS programmable timer | CD4541-family programmable timer | CD4541-family programmable timer | CMOS programmable timer |
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi |
Key Differentiators
- CD4541-family programmable timing architecture (vs CD4541BP)
- Verified 20 V high-voltage rating (vs CD4541BM96)
- Continuous square-wave mode (vs CD4541BC)
Design Notes
Estimated: the exact CD4541BM supply-current value is not included in the verified data, so do not assume a quiescent-current budget. Before layout, identify the actual supply range from the TI datasheet and calculate worst-case dissipation from the supply voltage, load current, and output duty cycle. Add local supply bypassing and route the return path close to the timer ground. If the timer drives external circuitry through a buffer, include that interface current in the system power estimate rather than assigning it to the timer alone.
Do not select CD4541BP or another CD4541-family suffix solely by function. Package, pinout, supply range, timing characteristics, and ordering grade must match the CD4541BM footprint and schematic. The supplied search results identify several related CD4541 variants but do not provide a complete equivalence matrix. Before substitution, compare the exact manufacturer datasheet, package drawing, truth table, and electrical characteristics. A timer that works electrically but has a different SOIC lead arrangement can still prevent board assembly.
Keep the external oscillator resistors and capacitor physically close to the timer’s oscillator pins, and keep the timing node away from high-current switching nodes and long unprotected traces. Route MODE and MASTER RESET as short, clean control nets with defined logic levels. Place any output-stage driver or buffer after the timer rather than relying on the timer to directly source an actuator. The verified 14-pin SOIC package requires a land pattern matching the TI package drawing; the supplied data does not provide the exact PCB footprint dimensions.
Compliance Information
The supplied verified results do not provide explicit RoHS, REACH, lead-free, halogen-free, or conflict-minerals statements for CD4541BM. AEC-Q100 is not identified as a qualification for this timer.
