HCS301-I/P Microchip Integrated Circuit (Dual-In-Line Packages) In Stock
The HCS301-I/P is a rolling-code encoder IC from Microchip designed for secure remote keyless entry and access control transmitter applications, housed in an 8-pin 0.300-inch DIP package. It implements the KeeLoq algorithm with a 64-bit encrypted rolling code to prevent replay attacks. Ideal for garage door openers, automotive entry systems, and building access fobs requiring high-security wireless transmission.
- Manufacturer
- Microchip
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- HCS301-I/P Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $1.1610(MOQ 1)
- Temp Range
- -40.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of HCS301-I/P?
- KeeLoq 64-bit rolling-code encryption for anti-replay security
- 8-pin 0.300-inch PDIP through-hole package for easy prototyping
- Supports up to 4 transmit buttons with individual key inputs
- Operates from a wide supply voltage of 2.0 V to 6.3 V for battery compatibility
- Low-power standby mode for extended coin-cell battery life
- On-chip EEPROM stores 64-bit serial number and synchronization counter
- RoHS-compliant, lead-free (e3) construction
What is HCS301-I/P used for?
The HCS301-I/P is used in wireless remote control transmitters for residential and commercial access systems, including garage door openers, barrier gates, and building entry fobs, where the KeeLoq rolling code prevents code-grabbing attacks. Its 8-pin DIP package and simple interface to an RF transmitter module make it straightforward to prototype and integrate into custom remote-control PCBs with minimal external components. The wide 2.0 V to 6.3 V operating range ensures compatibility with coin cells, AA batteries, and small lithium cells used in compact handheld transmitters.
What are the specifications of HCS301-I/P?
| Pbfree Code | Yes |
| Manufacturer Package Code | PDIP-8 |
| Factory Lead Time | 18Weeks |
| YTEOL | 8 |
| JESD-30 Code | R-PDIP-T8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Screening Level | TS 16949 |
| Supply Current-Max | 12mA |
| Supply Voltage-Nom | 6.6V |
| Surface Mount | NO |
| Telecom IC Type | DATA ENCRYPTION CIRCUIT |
| Temperature Grade | INDUSTRIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.01 |
| Country of Origin | Thailand |
Where can I find the HCS301-I/P datasheet?
HCS301-I/P Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for HCS301-I/P?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What encryption method does the HCS301-I/P use to prevent code replay attacks in remote access systems?
The HCS301-I/P uses Microchip's proprietary KeeLoq algorithm, generating a new 64-bit encrypted rolling code for each button press. Because each transmission uses a unique code derived from the 64-bit serial number and a synchronization counter stored in on-chip EEPROM, a recorded transmission cannot be replayed successfully, providing strong protection against code-grabbing attacks used to compromise garage doors and vehicle entry systems.
What supply voltage range does the HCS301-I/P support, and is it suitable for coin-cell battery operation?
The HCS301-I/P operates over a supply voltage range of 2.0 V to 6.3 V, making it directly compatible with coin-cell batteries such as CR2032 (3 V nominal) and AA alkaline cells (1.5 V × 2 = 3 V). Its low-power standby mode keeps current draw in the nanoamp range between button presses, enabling years of operation from a single CR2032 cell in a typical garage door remote that is activated only a few times per day.
How many transmit button inputs does the HCS301-I/P support, and how does it encode multiple functions?
The HCS301-I/P supports up to 4 individual button inputs on its key input pins, allowing a single transmitter PCB to provide 4 distinct functions such as open, close, stop, and light control for a garage door system. Each button press triggers a new rolling-code transmission that includes a 2-bit button identifier, so the receiver can decode which of the 4 buttons was pressed along with verifying the 64-bit encrypted code.
How does the HCS301-I/P synchronize with the receiver after extended periods without use or after battery replacement?
The HCS301-I/P stores its 16-bit synchronization counter in on-chip EEPROM, which retains the count through power loss. The receiver is designed to accept codes within a resync window of typically 256 counts ahead of the last received value, so normal intermittent use does not lose synchronization. If the transmitter counter advances beyond the window—for example, after accidental repeated presses without the receiver nearby—most systems provide a re-learn procedure where the button is pressed twice in sequence to re-establish the synchronization baseline.
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|---|---|---|
| 1+ | $2.1500 | $2.15 |
| 45+ | $1.2900 | $58.05 |
| 117+ | $1.1610 | $135.84 |
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