component
HT4338ARZ
Public Made by Adomby adom
HTCSEMI Real Time Clocks, SOP-8. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownHT4338ARZ
HTCSEMI · Real Time Clocks · SOP-8
HT4338ARZ from HTCSEMI, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | X1 | input | Connection for a standard 32.768kHz quartz crystal with a specified load capacitance of 12.5pF, and it is the input to the internal oscillator that can optionally be driven by an external 32.768kHz oscillator. |
| 2 | X2 | output | Output of the internal oscillator for the crystal, which is left floating when an external oscillator is connected to X1. |
| 3 | VBAT | power_in | Backup supply input for a standard 3V lithium cell or other energy source, which must be held between the datasheet's minimum and maximum limits (2.0 V to 3.5 V) for proper operation, and must be grounded if no backup supply is used. |
| 4 | GND | power_in | Ground reference for the device. |
| 5 | SDA | bidirectional | Serial data input/output for the I2C-type two-wire interface; the pin is open drain and requires an external pullup resistor. |
| 6 | SCL | input | Serial clock input for the two-wire interface that synchronizes data movement on SDA. |
| 7 | SQW/OUT | output | Programmable square-wave/output driver, open drain, requiring an external pullup resistor, that outputs 1Hz, 4kHz, 8kHz or 32kHz when enabled and operates with either VCC or VBAT applied. |
| 8 | VCC | power_in | Primary power supply, which must be within the normal limits of 4.5 V to 5.5 V for full read/write access, and below which access is inhibited when a backup supply is connected. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | HTCSEMI |
| Package | SOP-8 |
| Category | Clock/Timing |
| Pins | 8 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Supply voltage | VCC | 4.5 | 5.5 | V | 3 | ||
| Battery voltage | VBAT | 2 | 3.5 | V | 3 | ||
| Low level input voltage | VIL | -0.3 | 0.8 | V | 3 | ||
| High level input voltage | VIH | 2.2 | V | max printed as VCC+ 0.3 | 3 | ||
| Supply voltage (limit permissible) | VCC | -0.5 | 7 | V | Limit permissible mode | 3 | |
| Battery voltage (limit permissible) | VBAT | -0.5 | 7 | V | Limit permissible mode | 3 | |
| Low level input voltage (limit permissible) | VIL | -0.5 | 7 | V | Limit permissible mode | 3 | |
| High level input voltage (limit permissible) | VIH | -0.5 | 7 | V | Limit permissible mode | 3 | |
| Storage temperature | TS | -55 | 125 | °C | Limit permissible mode | 3 | |
| Input leakage current (SCL only) | ILI | 1 | µA | 3 | |||
| In/Out leakage current (SDA and SQW/OUT) | ILO | 1 | µA | 3 | |||
| Low level output voltage | VOL | 0.4 | V | VCC = 4.5 V; load current 5 mA (note 1) | 3 | ||
| Consumption current in the data transfer mode | ICCA | 1500 | µA | fSCL = 100 kHz | 3 | ||
| Consumption current in the static mode | ICCS | 200 | µA | VCC = 5 V and SDA, SCL = 5 V | 3 | ||
| Consumption current in the battery mode (SQW/OUT OFF, 32 kHz ON) | IBAT1 | 0.5 | µA | VCC = 0 V, VBAT = 3 V; SQW/OUT OFF, 32 kHz ON | 3 | ||
| Consumption current in the battery mode (SQW/OUT ON, 32 kHz ON) | IBAT2 | 0.8 | µA | VCC = 0 V, VBAT = 3 V; SQW/OUT ON, 32 kHz ON | 3 | ||
| Cycle frequency SCL | fSCL | 0 | 100 | kHz | 4 | ||
| Time of the bus vacant status between STOP and START | tBUF | 4.7 | µsec | 4 | |||
| Hold time (repeated) of START status | tHD:STA | 4 | µsec | 4 | |||
| Duration of the low status of the cycle pulse SCL | tLOW | 4.7 | µsec | 4 | |||
| Duration of the cycle pulse high status SCL | tHIGH | 4 | µsec | 4 | |||
| Pre-set time for the repeated status START | tSU:STA | 4.7 | µsec | 4 | |||
| Data hold time | tHD:DAT | 0 | µsec | 4 | |||
| Data pre-set time | tSU:DAT | 250 | nsec | 4 | |||
| Rise time of signals SDA and SCL | tR | 1000 | nsec | 4 | |||
| Drop time of signals SDA and SCL | tF | 300 | nsec | 4 | |||
| Pre-set time for the status STOP | tSU:STO | 4.7 | µsec | 4 | |||
| Total capacitance load per each bus line | CB | 400 | pF | 4 | |||
| IN / OUT capacitance | CI/O | 10 | 10 | pF | 4 | ||
| Load capacitance of the quartz resonator | CLX | 12.5 | 12.5 | pF | 4 |
CAD (KiCad official)
- Symbol:
HT4338ARZ - Footprint:
Package_SO:SOIC-8_3.9x4.9mm_P1.27mm - 3D model: SOP-8 (KiCad packages3D, STEP)
- 3D model files:
ht4338arz-etched.step/ht4338arz-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);ht4338arz.step/ht4338arz.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: HTCSEMI datasheet (12 pp, sha256
fed9f0f595cd65d0, retrieved 2026-10-19, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).