CD4521BM Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The CD4521BM is a CMOS 24-stage frequency divider from Texas Instruments in the 4000-series logic family, featuring a 2-channel binary counter with outputs accessible from the last 7 stages and a maximum input frequency of 2 MHz in a 16-pin SOIC package. It is designed for wide supply voltage operation from 3 V to 18 V, making it versatile for battery-powered and industrial timing applications. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD4521BM Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 24-stage binary ripple counter with outputs tapped from the last 7 stages, providing selectable divide ratios up to 2^24 from a single IC
- Wide supply voltage range (3 V to 18 V) and CMOS 4000-series compatibility for easy integration in battery-powered and mixed-voltage timing designs
- 16-pin SOIC package with 2 MHz maximum input frequency, suitable for low-power clock division and precision long-duration timing circuits
Applications
The CD4521BM is used in clock division, frequency scaling, and long-interval timer circuits in industrial and consumer electronics. Its 24-stage binary counter architecture allows generation of very long time delays from a high-frequency oscillator, making it ideal for real-time clock dividers, programmable timers, and frequency synthesis pre-scalers. The wide supply range and low quiescent current suit battery-operated portable instruments and remote sensor nodes.
Specifications
| YTEOL | 0 |
| Additional Feature | OUTPUTS FROM LAST 7 STAGES AVAILABLE |
| Count Direction | UP |
| Family | 4000/14000/40000 |
| JESD-30 Code | R-PDSO-G16 |
| JESD-609 Code | e4 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | NO |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 2000000Hz |
| Max I(ol) | 0.0024A |
| Mode of Operation | ASYNCHRONOUS |
| Number of Bits | 24 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP16,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Power Supply Current-Max (ICC) | 3mA |
| Prop. Delay@Nom-Sup | 4500ns |
| Propagation Delay (tpd) | 12000ns |
| Qualification Status | Not Qualified |
| Schmitt Trigger | NO |
| Supply Voltage-Max (Vsup) | 18V |
| Supply Voltage-Min (Vsup) | 3V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | YES |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Type | NEGATIVE EDGE |
| fmax-Min | 6.5MHz |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mexico |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD4521BM:
Binary Counter, 4000/14000/40000 Series, Asynchronous, Negative Edge Triggered, 24-Bit, Up Direction, CMOS, PDSO16
Binary Counter, 4000/14000/40000 Series, Asynchronous, Negative Edge Triggered, 24-Bit, Up Direction, CMOS, PDSO16
Frequently Asked Questions
How many divider stages does the CD4521BM have?
The CD4521BM contains 24 binary divider stages arranged as an up-counter. Outputs from the last 7 stages are externally accessible, allowing the designer to select divide ratios of 2^18 through 2^24 depending on the application's required output frequency.
What is the maximum input frequency the CD4521BM can handle?
The CD4521BM supports a maximum input clock frequency of 2 MHz (2,000,000 Hz) at nominal supply voltage. This makes it suitable for dividing standard crystal oscillator frequencies down to audio-range or sub-Hz output frequencies for timing and control circuits.
What supply voltage range does the CD4521BM support?
As a member of the CMOS 4000-series logic family, the CD4521BM operates over a wide supply voltage range of 3 V to 18 V. This flexibility allows it to work directly with 3.3 V, 5 V, or 12 V system power rails without additional level shifting.
What package does the CD4521BM use?
The CD4521BM is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, identified by JESD-30 code R-PDSO-G16. The surface-mount SOIC footprint is widely compatible with standard PCB assembly processes and is suitable for compact board designs.
Related Guides
SN74LVC14APWR Hex Schmitt-Trigger Inverter: Application Note and Design Guide
Complete design guide for the SN74LVC14APWR hex Schmitt-trigger inverter: thresholds, decoupling, oscillator design, package selection, and common pitfalls.
May 21, 2026
TPS62841DGRR Buck Converter Selection Guide: Ultra-Low 60 nA IQ for Battery-Powered IoT
How to choose the right TPS62841 variant for IoT, wearables, and wireless sensors: quiescent current, voltage range, package, and application examples.
May 21, 2026
TPS54160DGQR Selection Guide: How to Choose a 60V Step-Down Buck Converter
Complete selection guide for the TPS54160DGQR 60V/1.5A step-down converter. Compare specs, alternatives, and sourcing options for industrial and automotive designs.
May 20, 2026
LMV932MM Dual Low-Voltage CMOS Op-Amp: Application Design Guide
Complete application design guide for the LMV932MM dual rail-to-rail CMOS op-amp: supply decoupling, RRIO design rules, stability, and recommended circuits for 1.8V–5.5V battery-powered systems.
May 20, 2026
Why Buy from FindMyChip
About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“We've been using FindMyChip for 2 years. Pricing is consistently 20-30% below Mouser/DigiKey for volume orders.”