component
ht1307arz
Public Unreviewedby Ray
HTCSEMI Real-time Clocks (RTC), SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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README
markdownHT1307ARZ
HTCSEMI · Real-time Clocks (RTC) · SOIC-8
HT1307ARZ from HTCSEMI, in a SOIC-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | X1 | input | Connection to one terminal of the external 32.768 kHz quartz crystal used by the on-chip oscillator. Recommended crystal load capacitance CLX = 12.5 pF. |
| 2 | X2 | output | Connection to the second terminal of the external 32.768 kHz quartz crystal for the on-chip oscillator. Recommended crystal load capacitance CLX = 12.5 pF. |
| 3 | VBAT | power_in | Backup battery supply input, 2.0-3.5 V (absolute max -0.5 to 7.0 V). Sustains timekeeping and RAM when VCC is removed; typical IBAT is 0.5 uA (SQW off) or 0.8 uA (SQW on, 32 kHz on) at VBAT = 3 V. |
| 4 | GND | power_in | Device ground. All voltages are referenced to this pin. |
| 5 | SDA | bidirectional | Serial data I/O for the two-wire (I2C-compatible) bus. Open-drain output requires an external pull-up resistor to VCC. VOL <= 0.4 V at 5 mA sink; total bus capacitance up to 400 pF; supports standard-mode transfers at 100 kHz. |
| 6 | SCL | input | Serial clock input for the two-wire (I2C-compatible) bus. Requires an external pull-up to VCC; input leakage ILI <= 1 uA. Maximum SCL frequency 100 kHz (standard mode). |
| 7 | SQW/OUT | output | Programmable square-wave / general-purpose output. When SQWE (control register bit 4) = 1, outputs 1 Hz, 4.096 kHz, 8.192 kHz, or 32.768 kHz selected by RS1:RS0. When SQWE = 0, the pin is driven to the level of the OUT bit. Open-drain: requires an external pull-up resistor. |
| 8 | VCC | power_in | Primary supply, 4.5-5.5 V (absolute max -0.5 to 7.0 V). When VCC > VBAT + 0.2 V the device operates from VCC; when VCC falls below 1.25 x VBAT the device inhibits access and switches to VBAT. Typical ICC 200 uA static / 1500 uA max during I2C traffic at 100 kHz. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | SOIC-8 |
| Category | RTC |
| Pins | 8 |
Ordering variants
HT1307ARZ
CAD (KiCad official)
- Symbol:
HT1307ARZ - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOIC-8 (KiCad packages3D, STEP)
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HTCSEMI datasheet (None pp, sha256
98877efba26d92a8, retrieved 2026-08-17, tier: lcsc) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).