HCS300/SN Microchip Integrated Circuit (Small Outline Packages) In Stock
Microchip HCS300/SN is a KEELOQ code-hopping encoder IC for secure remote keyless entry systems, providing 66-bit encrypted rolling code transmission in a compact 8-pin SOIC package. Available from stock worldwide with fast shipping.
- Manufacturer
- Microchip
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- HCS300/SN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.9500(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of HCS300/SN?
- KEELOQ 66-bit rolling code encryption algorithm providing billions of unique codes per transmitter, making replay attacks virtually impossible in automotive remote keyless entry systems
- Integrated 8-pin SOIC package with single-function encoder architecture, enabling simple low-component-count transmitter designs operating from 2.0 V to 6.3 V supply rails
- RoHS-compliant (Pb-free, JESD-609 e3) plastic SOIC-8 package rated to 260 °C peak reflow temperature for compatibility with lead-free SMT assembly processes
What is HCS300/SN used for?
The Microchip HCS300/SN is widely used in automotive remote keyless entry (RKE) transmitters, garage door openers, and home alarm system keyfobs requiring secure rolling-code authentication. Its KEELOQ algorithm generates a unique 66-bit encrypted code with each button press, preventing code-grabbing attacks that defeat fixed-code systems. The SOIC-8 form factor suits compact battery-powered RF transmitter modules operating at 315 MHz or 433.92 MHz.
What are the specifications of HCS300/SN?
| Pbfree Code | Yes |
| Manufacturer Package Code | SOIC-8 |
| Reach Compliance Code | Compliant |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Supply Voltage-Nom | 5V |
| Surface Mount | YES |
| Telecom IC Type | DATA ENCRYPTION CIRCUIT |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 40 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
Where can I find the HCS300/SN datasheet?
HCS300/SN Datasheet DownloadOfficial datasheet from Microchip
What are equivalent replacements for HCS300/SN?
Compatible alternatives and drop-in replacements for HCS300/SN:
Frequently Asked Questions
How secure is the KEELOQ rolling code in the HCS300/SN against replay attacks?
The HCS300/SN uses the KEELOQ algorithm to generate a 66-bit hopping code that changes with every transmission, creating over 18 billion unique code combinations per device. A recorded transmission cannot be replayed successfully because the receiver expects the next valid code in the rolling sequence, making the HCS300/SN resistant to electronic replay attacks in automotive and home security applications.
What supply voltage range does the HCS300/SN support and which battery types are suitable?
The HCS300/SN operates from a supply voltage range of approximately 2.0 V to 6.3 V, making it compatible with single CR2032 lithium coin cells (3 V nominal), two AA alkaline cells (3 V), and 12 V systems with a voltage regulator. This wide input range ensures the encoder continues operating as the battery discharges from 3 V down toward 2 V in a typical keyfob application.
Can the HCS300/SN replace fixed-code encoders in existing garage door opener designs?
Yes, the HCS300/SN can upgrade legacy fixed-code systems to rolling-code security. However, the receiver must be replaced or updated with a HCS300-compatible KEELOQ decoder such as the Microchip HCS515 or HCS200 receiver IC, as rolling codes are incompatible with fixed-code decoders. The transmitter redesign replaces the fixed encoder with the 8-pin HCS300/SN and its supporting resistors and capacitors.
For a compact keyfob PCB, how small is the HCS300/SN SOIC-8 package footprint?
The HCS300/SN SOIC-8 package (JESD-30 code R-PDSO-G8) measures approximately 5.0 mm x 4.0 mm with 1.27 mm pin pitch, occupying a very small PCB footprint. This compact 8-pin outline allows complete keyfob transmitter circuits with fewer than 10 additional passive components, fitting in enclosures smaller than 30 mm x 20 mm for automotive key fob form factors.
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More from Microchip
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 1+ | $1.4800 | $1.48 |
| 25+ | $1.4300 | $35.75 |
| 46+ | $0.9975 | $45.89 |
| 293+ | $0.9500 | $278.35 |
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