logic

HT12

Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the HT12 family does

The HT12D/HT12F are CMOS decoders in the 212 series designed for remote control systems. These devices decode serial addresses and data transmitted via infrared or radio frequency, comparing inputs three times to ensure accuracy before transferring valid codes to output pins. The HT12D handles 8 address bits and 4 data bits, while the HT12F decodes 12 address bits only. Operating voltage spans 2.4V to 12V with low standby current and high noise immunity. They require only a 5% resistor for the built-in oscillator and feature a valid transmission indicator. Typically used in burglar alarms, car alarms, smoke detectors, security systems, and garage door controllers, these parts come in 18-pin DIP and 20-pin SOP packages with minimal external components needed.

Next step
Start building with HT12 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
Ordering code:
01 — Key specifications

HT12D datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 200 µA 400 µA 5V; No load, fOSC = 150kHz; idd; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
output current 1 mA 1.6 mA — 5V; VOL = 0.5V; io(d8~d11); Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
supply voltage range 2.4 V 5 V 12 V —; —; vdd; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
operating temperature -20 °C — 75 °C Holtek datasheet, p. 3
standby current — 100 nA 1 µA 5V; Oscillator stops; istb; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
output voltage high — 4.5 V — VDD = 5V, test condition for data output source current Holtek datasheet, p. 3 — Electrical Characteristics
output voltage low — 500 mV — VDD = 5V, test condition for data output sink current Holtek datasheet, p. 3 — Electrical Characteristics
01 — Key specifications

HT12F datasheet parameters

ParameterMinTypMaxConditionsSource
quiescent current — 200 µA 400 µA 5V; No load, fOSC = 150kHz; idd; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
output current 1 mA 1.6 mA — 5V; VOL = 0.5V; io(d8~d11); Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
supply voltage range 2.4 V 5 V 12 V —; —; vdd; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
operating temperature -20 °C — 75 °C Holtek datasheet, p. 3
standby current — 100 nA 1 µA 5V; Oscillator stops; istb; Electrical Characteristics Holtek datasheet, p. 3 — Electrical Characteristics
output voltage high — 4.5 V — VDD = 5V, test condition for data output source current Holtek datasheet, p. 3 — Electrical Characteristics
output voltage low — 500 mV — VDD = 5V, test condition for data output sink current Holtek datasheet, p. 3 — Electrical Characteristics
03 — Alternatives

Closest matches to HT12

HT12A 1.7× lower supply voltage range, similar operating temperature, similar quiescent current
NL17SZ125 20.0× higher output current, 1.4× lower supply voltage range, 1.3× higher operating temperature
SN54HC595 5.0× lower output voltage low, 2.4× lower output voltage high, 1.3× higher operating temperature
74HC14BQ 15.6× higher output current, 2.2× lower output voltage high, 1.1× lower operating temperature
74HC164BQ 15.6× higher output current, 2.2× lower output voltage high, 1.1× lower operating temperature
74HC595D 2.2× lower output voltage high, 1.2× lower supply voltage range, 1.2× lower operating temperature
74HCT165BQ 15.6× higher output current, 2.2× lower output voltage high, 1.5× higher operating temperature
74HCT595BQ 15.6× higher output current, 4.5× higher operating temperature, 2.5× lower quiescent current
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