CD54HC40103F Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
CD54HC40103F is a single 8-bit synchronous/asynchronous binary down counter from Texas Instruments in the HC High-Speed CMOS family, packaged in a 16-pin ceramic DIP. It features a terminal count output (TCO), synchronous load, and asynchronous reset-to-maximum-count capability for flexible countdown timing applications. Available from stock worldwide for military, aerospace, and industrial designs requiring ceramic package reliability.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD54HC40103F 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
What are the key features of CD54HC40103F?
- 8-bit binary down counter with synchronous parallel load for presettable countdown intervals from 1 to 255 clock cycles
- Terminal Count Output (TCO) goes low when counter reaches zero, enabling direct cascade or interrupt generation without external decode logic
- Asynchronous reset-to-maximum-count (255) pin allows instant counter reinitialization independent of the clock, with HC CMOS 2 V to 6 V operation
What is CD54HC40103F used for?
The CD54HC40103F is used in programmable timer and watchdog circuits where an 8-bit countdown from a preset value triggers an event or interrupt upon reaching zero, with the TCO output directly signaling the terminal state. It is also applied in frequency divider chains and event sequencing controllers in avionics and military electronics where the ceramic DIP package ensures reliability across extended temperature ranges. The synchronous load feature makes it easy to implement periodic interrupt generation by reloading the counter automatically in cascaded digital timer designs.
What are the specifications of CD54HC40103F?
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | TCO OUTPUT; RESET TO MAX COUNT |
| Count Direction | DOWN |
| Family | HC/UH |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 10000000Hz |
| Max I(ol) | 0.0052A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 8 |
| Number of Functions | 1 |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.08mA |
| Prop. Delay@Nom-Sup | 64ns |
| Propagation Delay (tpd) | 450ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 6V |
| Supply Voltage-Min (Vsup) | 2V |
| Supply Voltage-Nom (Vsup) | 4.5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 12MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Where can I find the CD54HC40103F datasheet?
CD54HC40103F Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for CD54HC40103F?
Compatible alternatives and drop-in replacements for CD54HC40103F:
Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 8-Bit, Down Direction, CMOS, PDIP16
Binary Counter, HC/UH Series, Synchronous, Positive Edge Triggered, 8-Bit, Down Direction, CMOS, CDIP16
Frequently Asked Questions
What is the counting range and direction of the CD54HC40103F, and how does the preset load work?
The CD54HC40103F counts down from a preloaded 8-bit value (1 to 255 decimal) to zero on each clock edge. The synchronous parallel load input (PL) transfers the 8-bit data from the D0–D7 pins into the counter register on the next rising clock edge. When the counter reaches zero, the Terminal Count Output (TCO) goes active low to signal completion or trigger an external reload.
How does the Terminal Count Output (TCO) of the CD54HC40103F facilitate cascading multiple counters?
When the CD54HC40103F reaches a count of zero, its TCO output goes low for one clock period. By connecting the TCO of a lower-order counter to the clock enable of a higher-order CD54HC40103F, designers build 16-bit (2-stage) or 24-bit (3-stage) countdown timers without additional decode logic, achieving countdown intervals far beyond the single 8-bit (255-count) limit.
Why is the ceramic DIP package of the CD54HC40103F preferred in military and aerospace applications?
The ceramic dual-in-line package (CDIP-16) provides hermetic sealing that protects the die from moisture, ionic contamination, and corrosive atmospheres far better than plastic packages. It also withstands wider temperature extremes, typically -55°C to 125°C, meeting MIL-spec screening requirements. For aerospace avionics and defense electronics with long service lives, ceramic packaging ensures consistent electrical performance over decades.
What supply voltage range does the CD54HC40103F support, and how does it compare to TTL-based down counters?
The CD54HC40103F operates from 2 V to 6 V, covering both 3.3 V and 5 V systems, while its HC CMOS inputs accept TTL-level signals at 5 V. Compared to older bipolar TTL down counters such as the 74LS40103, the HC CMOS version consumes significantly less quiescent current—typically under 1 µA static versus milliamp-level TTL standby—making it far more power-efficient in battery-backed timer circuits.
Related Guides
CSD87313DMS Synchronous Buck Power Stage Design Guide
Design a compact CSD87313DMS synchronous buck stage with practical guidance for loss, gate drive, PCB layout, EMI, thermal validation, and sourcing.
Aug 6, 2026
STEF05SGR eFuse Selection Guide for 5 V Overcurrent Protection
Choose STEF05SGR for 5 V overcurrent protection by checking current-limit margin, inrush, thermal loss, fault response, and sourcing.
Aug 6, 2026
C0402C103K3RACTU Selection Guide: Choosing a 10 nF 0402 MLCC
Select C0402C103K3RACTU by voltage margin, X7R behavior, tolerance, 0402 assembly risk, and qualified alternatives.
Aug 4, 2026
STM32H753VIT6 MCU Selection Guide: Memory, Package, Connectivity, and Security
Choose STM32H753VIT6 by evaluating memory architecture, LQFP-100 pin fit, connectivity, security, power, and sourcing tradeoffs.
Aug 4, 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.
More from Texas Instruments
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.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit