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HCS101T/SN from Microchip Technology is a fixed-code encoder for unidirectional remote-control transmitters in an 8-SOIC (0.154", 3.90mm Width) package.
Commercial-temperature tape-and-reel surface-mount ordering option. Check receiver design and code management before using it in a security-sensitive system.
HCS101 provides a 66-bit fixed-code transmission for remote-control systems. Three switch inputs provide seven button functions. On-chip EEPROM stores programmed serial-number and counter information; a compatible receiver and separate RF transmitter circuitry are still required.
Operates from 3.5 V to 13.3 V.
S0, S1 and S2 permit seven input combinations.
Includes an oscillator, timing circuitry and code-word completion.
The T prefix denotes tape-and-reel delivery; without -I, the listed ambient range is 0°C to +70°C.
Two programmable 32-bit serial numbers plus a 10-bit serial-number field are described in the data sheet.
Nonvolatile 16-bit counter is part of the programmed transmitter data.
66-bit code word, selectable baud rate and automatic completion.
Battery-low status can be conveyed to the receiver.
The registered package is 8-SOIC (0.154", 3.90mm Width), corresponding to Microchip's 8-lead, 150-mil-body SN outline.

The registered local JPG is present; use the manufacturer drawing for dimensions.
Microchip's top-view PDIP/SOIC pin diagram assigns:
Do not copy a different HCS-family pin map without checking its own data sheet.
| Function | Fixed-code encoder |
|---|---|
| Supply voltage | 3.5 V to 13.3 V |
| Ambient temperature | 0°C to +70°C, commercial option |
| Transmission code length | 66 bits |
| Switch inputs | Three; seven functions |
| Serial-number storage | Two programmable 32-bit fields and one 10-bit field |
| Counter | 16-bit nonvolatile |
| Package | 8-lead SOIC, 150-mil body |
| Order packaging | Tape and reel |
Consult the full DC and timing tables for application-specific operating conditions.
Microchip describes HCS101 as pin-compatible with the HCS201 code-hopping encoder, but HCS201 changes the security and receiver protocol. A package match does not make these devices functionally interchangeable. Check the complete ordering code, supply and temperature range, transmitter programming, receiver firmware and regulatory behavior before substitution.
No unverified internal substitute is linked here.
Microchip Technology identifies HCS101 as a fixed-code encoder. The T device prefix identifies tape-and-reel delivery; the blank temperature field denotes 0°C to +70°C and SN identifies the narrow 8-lead SOIC outline. Verify current manufacturer notices and order availability before procurement.
Button encoding for a compatible unidirectional receiver.
Command data for an external RF stage.
Compact transmitter logic for simple control functions.
Fixed-code signaling where system-level security assessment permits it.
Verify the full HCS101T/SN label, lot traceability and package marking. Confirm programmed identity and counter values under a controlled provisioning process, then test the complete transmitter and receiver pair.
No. It transmits a fixed-code format; do not infer HCS201 security behavior.
No. The DATA output feeds external transmitter circuitry.
T denotes tape-and-reel delivery and SN denotes the 8-lead narrow SOIC; the blank temperature field is 0°C to +70°C.
Yes. The local registered 8-SOIC JPG is present.
Use Microchip's HCS101 data sheet for schematic, timing, programming and package design. Fixed-code systems require explicit replay-risk review. Confirm commercial-temperature suitability and receiver compatibility before design approval.
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