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Microchip Technology HCS300/P
- Part No.:
- HCS300/P
- Manufacturer:
- Microchip Technology
- Category:
- Specialized ICs
- Package:
- 8-DIP (0.300", 7.62mm)
- Description:
- IC CODE HOPPING ENCODER 8DIP
- Quantity:
Unit Price:$0
Ext Price:$0
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- Shipping:
Product Details
HCS300/P - KEELOQ Code-Hopping Encoder
HCS300/P is a Microchip code-hopping encoder intended for unidirectional remote-keyless-entry transmitters. The exact /P order code is an eight-lead, 300-mil plastic DIP in the commercial 0°C to +70°C temperature grade.
Use a compatible learned receiver and assess the mature KEELOQ security design against the current system threat model.
Overview
A button input triggers a 66-bit code word containing a 32-bit hopping portion and fixed serial, button, and status information. The synchronization value advances across transmissions. The encoder provides a PWM output for external transmitter circuitry and stores its cryptographic key and configuration in read-protected EEPROM.
Key Advantages
The code-hopping portion changes as the synchronization counter advances.
Four switch inputs support up to fifteen functions including combinations.
On-chip EEPROM, timing components, and LED output reduce external logic.
The /P code selects an eight-pin, 300-mil DIP body.
Feature Summary
A 28-bit serial number and 64-bit encryption key are stored on chip.
Each 66-bit transmission contains a 32-bit hopping code and 34 fixed/status bits.
Microchip's feature summary specifies 2.0 V to 6.3 V operation.
PWM carries the code word to transmitter circuitry; LED provides a current-limited indicator output.
Package & Footprint
LCDChip registers 8-DIP (0.300", 7.62mm). The Microchip product-identification table defines /P as an eight-lead, 300-mil plastic DIP; a blank temperature suffix is commercial 0°C to +70°C. Do not interchange its through-hole footprint with the /SN SOIC option.
- Confirm row spacing and drilling from the controlled drawing.
- Use the top-view pin-one mark for orientation.
- Keep LED and PWM routes consistent with the datasheet circuit.
The expected local JPG is absent and the production package URL returns HTTP 404. Keep the draft unpublished until the correct image is restored.
Pin Functions
Microchip assigns pin 1 S0, pin 2 S1, pin 3 S2 (also programming clock), pin 4 S3, pin 5 VSS, pin 6 PWM (also programming data), pin 7 LED (indicator cathode connection), and pin 8 VDD. Verify the package top view and programming circuit before layout.
Key Specifications
| Function | KEELOQ code-hopping encoder |
|---|---|
| Exact order code | HCS300/P |
| Registered package | 8-DIP, 300-mil body |
| Temperature grade | Commercial, 0°C to +70°C |
| Operating supply | 2.0 V to 6.3 V per feature summary |
| Button inputs | Four, S0 to S3 |
| Available functions | Fifteen |
| Transmission length | 66 bits |
| Hopping portion | 32 bits |
| Fixed/status portion | 34 bits |
| Serial number | 28-bit programmable |
| Cryptographic key | 64-bit programmable, read-protected |
| Signal output | PWM |
| Indicator output | LED cathode connection with current limiting |
Detailed DC and timing limits are conditional; apply the manufacturer tables to the actual supply and load.
Replacement Considerations
Other HCS-family encoders may differ in pin functions, button count, code format, power range, receiver learning, and programming. Package and grade must also match. No unverified LCDChip alternative link is included.
Manufacturer Information
Microchip's HCS300 KEELOQ Code Hopping Encoder Data Sheet, DS21137F, defines the feature set, eight-pin assignment, product identification, electrical characteristics, and programming behavior. Check the latest manufacturer-controlled revision and lifecycle status during design review.
Applications
Encode button commands for a compatible receiver.
Provide a learned changing code to external RF circuitry.
Support handheld transmitters with up to four button inputs.
Use only after reviewing system security and receiver design.
Quality & Authenticity
Verify physical marking, lot traceability, DIP dimensions, switch inputs, PWM waveform, and LED behavior. Protect manufacturer codes and device keys during provisioning. Test receiver learning and synchronization; evaluate legacy cipher security against contemporary requirements.
FAQ
Is the RF transmitter integrated?
No. HCS300 encodes commands and needs external RF circuitry and a compatible decoder.
What does /P designate?
An eight-lead, 300-mil plastic DIP; with no -I suffix, the temperature grade is commercial.
Is HCS300 pin-compatible with HCS201?
Do not assume so; their input and output functions differ and must be compared pin by pin.
Why is this page not published?
The registered 8-DIP JPG is not accessible on the production site.
Engineering Notice
Verify the current Microchip datasheet for programming, RF interface timing, electrical limits, package drawing, and key-management requirements. Restore and inspect the production package JPG before formal publication.
HCS300/P Information
- Specifications
- Tags
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- KEELOQ®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Type:
- Code Hopping Encoder
- Applications:
- Remote Secure Access, Keyless Entry
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
- Grade:
- -
- Qualification:
- -
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