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sitime

SiTime MEMS振荡器的MPN编码模式、后缀解码以及处理器指南。在使用SiTime定时组件或SiTimeHandler时参考。

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SiTime Manufacturer Skill

Overview

SiTime is a leading manufacturer of MEMS-based silicon timing solutions including:

  • MEMS oscillators (MHz and kHz)
  • Super-TCXOs (temperature-compensated)
  • Clock generators
  • Automotive-qualified timing devices

SiTime's MEMS technology offers advantages over traditional quartz crystals:

  • Higher shock/vibration resistance
  • Smaller footprint options
  • Programmable frequency
  • Better reliability in harsh environments

MPN Structure

SiTime MPNs follow this general structure:

SiT[FAMILY]-[TEMP/OPTIONS]-[PACKAGE]-[FREQUENCY][OUTPUT]
    │              │            │          │        │
    │              │            │          │        └── Optional output type suffix (X, M, K)
    │              │            │          └── Frequency in MHz or kHz (e.g., 24.000000, 32.768)
    │              │            └── Package size code (e.g., 18E, DCC, 32E)
    │              └── Temperature grade + options (e.g., AI, BI, H4)
    └── Product family (e.g., 1533, 8008, 9121)

Example Decoding

SiT1533AI-H4-18E-32.768000X
│   │   │   │   │    │     │
│   │   │   │   │    │     └── X = Output type suffix
│   │   │   │   │    └── 32.768000 = Frequency (32.768 kHz)
│   │   │   │   └── 18E = 1.6x1.2mm package (1612 size)
│   │   │   └── H4 = Voltage/configuration code
│   │   └── AI = Temperature grade A, option I
│   └── 1533 = MHz LVCMOS Oscillator series
└── SiT = SiTime prefix

SiT8021AC-82-33S-24.000000X
│   │    │   │   │    │     │
│   │    │   │   │    │     └── X = Output type suffix
│   │    │   │   │    └── 24.000000 = 24 MHz
│   │    │   │   └── 33S = 3.2x2.5mm SOIC variant
│   │    │   └── 82 = Voltage/configuration
│   │    └── AC = Temperature grade A, variant C
│   └── 8021 = Precision MHz Oscillator
└── SiT = SiTime prefix

Product Families

SiT15xx - MHz LVCMOS Oscillators

| Series | Description | Key Features | |--------|-------------|--------------| | SiT1533 | 32.768 kHz MEMS Oscillator | Crystal replacement, ultra-low power | | SiT1534 | 32.768 kHz MEMS Oscillator | Higher accuracy variant | | SiT1552 | 32.768 kHz with AEC-Q100 | Automotive qualified |

SiT16xx - Low Power Oscillators

| Series | Description | Key Features | |--------|-------------|--------------| | SiT1602 | Low Power MHz Oscillator | Battery applications | | SiT1618 | Ultra Low Power | IoT/wearable focus |

SiT17xx - Ultra Low Power

| Series | Description | Key Features | |--------|-------------|--------------| | SiT1701 | Ultra Low Power | Lowest power consumption |

SiT5xxx/SiT85xx - Super-TCXO

| Series | Description | Key Features | |--------|-------------|--------------| | SiT5155 | Super-TCXO | +/-0.5 ppm stability | | SiT5156 | Super-TCXO | Extended temperature range | | SiT85xx | Super-TCXO alternate naming | Same family |

SiT80xx - Precision MHz Oscillators

| Series | Description | Key Features | |--------|-------------|--------------| | SiT8008 | Precision Oscillator | Low jitter, wide freq range | | SiT8021 | High Precision | Sub-1 ppm stability |

SiT81xx - Differential Oscillators

| Series | Description | Key Features | |--------|-------------|--------------| | SiT8148 | LVDS Output | High-speed differential | | SiT8152 | LVPECL Output | Network/telecom applications |

SiT86xx - High Performance

| Series | Description | Key Features | |--------|-------------|--------------| | SiT8621 | High Performance | Data center, 5G applications |

SiT88xx - Network Sync

| Series | Description | Key Features | |--------|-------------|--------------| | SiT8814 | Network Sync Oscillator | Telecom synchronization |

SiT90xx - High Temperature

| Series | Description | Key Features | |--------|-------------|--------------| | SiT9002 | High Temp Oscillator | -55C to +125C industrial |

SiT91xx - Automotive AEC-Q100

| Series | Description | Key Features | |--------|-------------|--------------| | SiT9120 | Automotive Oscillator | AEC-Q100 Grade 1 | | SiT9121 | Automotive Oscillator | Enhanced automotive |

SiT93xx - Clock Generators

| Series | Description | Key Features | |--------|-------------|--------------| | SiT9367 | Multi-output Clock Gen | Multiple frequencies |

SiT95xx - High Performance Clock

| Series | Description | Key Features | |--------|-------------|--------------| | SiT9501 | High Performance | Ultra-low jitter |

Package Codes

Numeric Size Codes

| Code | Physical Size | Industry Name | Notes | |------|---------------|---------------|-------| | 18E / 18 | 1.6 x 1.2 mm | 1612 | Ultra-small | | 21E / 21 | 2.0 x 1.6 mm | 2016 | Very small | | 25E / 25 | 2.5 x 2.0 mm | 2520 | Small | | 32E / 32 | 3.2 x 2.5 mm | 3225 | Standard | | 50E / 50 | 5.0 x 3.2 mm | 5032 | Medium | | 70E / 70 | 7.0 x 5.0 mm | 7050 | Large |

Chip-Scale Packages

| Code | Physical Size | Notes | |------|---------------|-------| | DCC | 1.5 x 0.8 mm | Chip-Scale Package (CSP) | | DCS | 1.2 x 1.0 mm | Ultra-small CSP |

Other Packages

| Code | Package Type | Notes | |------|--------------|-------| | SOT | SOT23-5 | 5-pin small outline | | QFN | QFN | Quad Flat No-lead |

Temperature Grades

Temperature grades are typically indicated in the first segment after the family number:

| Grade Letter | Range | Application | |--------------|-------|-------------| | A | Standard | Commercial (0C to +70C) | | B | Extended | Industrial (-40C to +85C) | | C | Automotive | Automotive (-40C to +105C) | | E | Extreme | Extended industrial (-40C to +125C) |

Examples:

  • SiT1533AI - Grade A, Industrial option
  • SiT8021BC - Grade B, Extended

Voltage/Configuration Codes

The second segment (after temperature) often contains voltage and configuration info:

| Code | Typical Meaning | |------|-----------------| | H4 | High voltage config | | 71 | 1.8V supply | | 82 | 2.5V/3.3V supply | | 33S | 3.3V SOIC variant |

Note: These codes vary by product family - consult SiTime datasheets for specific mappings.

Frequency Encoding

Frequency appears as the last numeric segment before any output type suffix:

| Format | Meaning | Example | |--------|---------|---------| | 32.768 | 32.768 kHz | RTC applications | | 24.000000 | 24 MHz | Standard MHz oscillator | | 25.000000 | 25 MHz | Ethernet applications | | 48.000000 | 48 MHz | USB applications | | 100.000000 | 100 MHz | High-speed applications |

Common Frequencies

| Frequency | Application | |-----------|-------------| | 32.768 kHz | RTC, low power | | 10 MHz | Reference oscillator | | 12 MHz | USB full speed | | 24 MHz | Microcontroller clock | | 25 MHz | Ethernet PHY | | 48 MHz | USB high speed | | 100 MHz | High-speed logic | | 125 MHz | Gigabit Ethernet |

Output Type Suffixes

| Suffix | Output Type | Notes | |--------|-------------|-------| | X | LVCMOS | Standard push-pull | | M | LVDS | Differential | | K | Clipped sine | Low EMI | | (none) | Default for series | Check datasheet |

Component Types in Handler

The SiTimeHandler supports:

| ComponentType | Description | Pattern | |---------------|-------------|---------| | OSCILLATOR | Primary type | ^SIT[0-9]{4}.* | | CRYSTAL | 32.768 kHz parts | ^SIT1[567][0-9]{2}.*-32\.768.* | | IC | Generic IC type | ^SIT[0-9]{4}.* |

Note: 32.768 kHz MEMS oscillators can serve as drop-in replacements for quartz crystals, hence the CRYSTAL type registration for those frequencies.

Handler Implementation Notes

Series Extraction

// Series is extracted as "SiT" + first 2 digits of 4-digit family
// Example: SiT1533AI-H4-18E-32.768000X -> "SiT15"
// Example: SiT8021AC-82-33S-24.000000X -> "SiT80"

// Special case: SiT5xxx Super-TCXO series
// SiT5155 -> "SiT5" (not "SiT51")
if (upperMpn.startsWith("SIT5") && Character.isDigit(upperMpn.charAt(4))) {
    return "SiT5";
}

Package Extraction

// Package code is typically the third hyphen-separated segment
// SiT1533AI-H4-18E-32.768000X
//              ^^^
// Pattern: -([0-9]{2}[A-Z]|[A-Z]{2,3})-

Frequency Extraction

// Frequency is the last segment after the final hyphen
// SiT1533AI-H4-18E-32.768000X
//                  ^^^^^^^^^^
// Pattern: ([0-9]+(?:\.[0-9]+)?)[MKX]?$

Official Replacement Logic

Two SiTime parts can be replacements if:

  1. Same series (e.g., both SiT15)
  2. Same frequency

They may differ in:

  • Temperature grade
  • Package size
  • Voltage configuration

Example MPNs

| MPN | Series | Package | Frequency | Description | |-----|--------|---------|-----------|-------------| | SiT1533AI-H4-18E-32.768000X | SiT15 | 1.6x1.2mm | 32.768 kHz | LVCMOS 32.768kHz oscillator | | SiT1552BC-H4-DCC-32.768000 | SiT15 | 1.5x0.8mm CSP | 32.768 kHz | Automotive 32.768kHz | | SiT8008BI-82-33E-24.000000X | SiT80 | 3.2x2.5mm | 24 MHz | Precision oscillator | | SiT8021AC-82-33S-24.000000X | SiT80 | 3.2x2.5mm | 24 MHz | High precision oscillator | | SiT9121AI-2C1-25E-48.000000 | SiT91 | 2.5x2.0mm | 48 MHz | AEC-Q100 automotive | | SiT5156AI-H4-DCC-25.000000M | SiT5 | 1.5x0.8mm CSP | 25 MHz | Super-TCXO with LVDS | | SiT9367AI-JW-25E | SiT93 | 2.5x2.0mm | Programmable | Clock generator |

Crystal Replacement Use Case

SiTime 32.768 kHz oscillators are often used as drop-in replacements for traditional quartz crystals in RTC applications:

Traditional Crystal Circuit:

[MCU] --XTAL1-- [Crystal] --XTAL2-- [MCU]
                   |
                 [Caps]

SiTime MEMS Replacement:

[MCU] --OSC_IN-- [SiT1533] --VDD-- [Power]
                     |
                   [GND]

Advantages of MEMS replacement:

  • No external load capacitors needed
  • Better shock/vibration resistance
  • Faster startup time
  • More consistent frequency across temperature

Related Files

  • Handler: manufacturers/SiTimeHandler.java
  • Component types: OSCILLATOR, CRYSTAL, IC
  • Series descriptions: Available via getSeriesDescription(mpn) helper method

Learnings & Edge Cases

  • SiT5 vs SiT85: Both refer to Super-TCXO family. SiT5xxx and SiT85xx patterns are both registered.
  • Frequency parsing: Frequency appears after the last hyphen, before optional output suffix (X, M, K).
  • 32.768 kHz special case: These parts are registered as both OSCILLATOR and CRYSTAL types since they can replace quartz crystals.
  • Package code position: The package code is in the third hyphen-separated segment, not a suffix like many other manufacturers.
  • No manufacturer-specific ComponentTypes: SiTimeHandler uses generic types (OSCILLATOR, CRYSTAL, IC) rather than SiTime-specific types.
  • Case insensitivity: Handler converts MPNs to uppercase before pattern matching (SiT = SIT = sit).
  • Series extraction returns 2-digit: Unlike some handlers that return full part numbers, SiTime series extraction returns abbreviated form (e.g., "SiT15" not "SiT1533").
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