The A2135-H GPS receiver modules enable fastest acquisition and tracking with the latest SiRFstarIV technology. This small form-factor module fully addresses the demand for lowest power consumption with, amongst other features, SiRFaware technology.

The removal of jammers does not only facilitate designs of new products, but guarantees operation even in hostile environments. High sensitivity during acquisition or while tracking allows for use in many different environments and under toughest operating conditions.

Product Highlights

  • SMT based integrated GPS antenna module
  • 17.8 x 16.5 mm2
  • 29 mA average tracking (full power mode)
  • -163 dBm tracking
  • Up to 8 strongest interferes signals detected and mitigated


  • Simplified integration
  • Efficient time to market
  • Leading performance

Key Markets

A2135-H Overview

The A2135-H (flash) is Lantronix answers to the most critical challenges in the GPS market: simplified integration, leading performance, and efficient time to market. The combination of the enhanced fully functional SiRFStar IV GPS engine and a custom-designed high directional patch antenna on board help to ease engineers integration effort of leading GPS technology into devices. The A2135-H address the demand for extreme low power operation and ultra-fast Time-To-First-Fix. Their high level of sensitivity allows for use in the most demanding environmental conditions.

Small footprint

The power pins, ground pins, and dedicated pins are at the same pin location across device densities so it can adapt to your actual configuration.

Ultra Low power consumption

SiRFaware’s advanced low power management modes, high level of integration and multiple communication ports in a small form-factor makes the A2135-H suitable for a broad spectrum of GPS applications where performance, cost and time to market are prime considerations (only 29 mA average tracking)

Anti-jamming detection

Our receivers offer an anti jamming feature: they constantly scan the signals in the area and blank out the non-satellite ones. You are then safe from jammers and others interferences.

Download SiRF Live

Test the performance of Maestro GNSS receivers and develop your application with SiRF Live software. Download here

A2135-H Tech Specs

Channels 48 parallel tracking
Correlators 400,000 plus
Frequency LI – 1,575 MHz
Tracking – 163 dBm
Navigation – 160 dBm
Acquisition (cold start) – 148 dBm
Position Accuracy
< 2.5 m CEP (autonomous)
< 2.0 m CEP SBAS
Time To First Fix
Hot Start < 1 s
Warm Start < 32 s
Cold Start < 35 s
Update Rate 1 Hz / 5 Hz Supported
UART – NMEA (Default)
NMEA message Switchable GGA, RMC, GSA, GSV, VTG, GLL, ZDA
Baud rate
4,800 (default)
1,200 to 115.2k
Ports Tx (NMEA output)
Rx (NMEA input)
UART – SiRF Specific SSB/OSP
SiRFbinary protocol Protocol for SiRFstar product family up to SSIII
One Socket Protocol Protocol extension for SiRFstarIV
Baud rate
57.6k (default)
1,200 to 115.2k
Ports Tx (NMEA output)
Rx (NMEA input)
SiRFnavTM High availability and coverage; improved TTFF in weak signal environments
SiRFawareTM Keeps module in a state of readiness for rapid navigation (hot start)
Jammer remover technology Detects and removes up to 8 in-band jammers with minimal loss of sensitivity
A-GPS Embedded Extended Ephemeris (SiRFInstantFix1) and Ephemeris Push support
MEMS I2C interface Prepared to use additional sensor information for improved navigation
Flash-based design
(A2135-H only)
Prepared to store configuration and calibration data and to allow firmware updates
Internal antenna Best matched build-in antenna for easy integration
Input voltage 3.0 to 3.6 VDC
Nominal 3.3 VDC
Average Current Draw A2135-H A2235-H
Full power mode (Searching) 36 mA 36 mA
Full power mode (tracking) 24 mA 22 mA
PTF mode 0.7 mA 0.9 mA
TricklePowerTM Mode 8.7 mA 7.2 mA
Hibernate 27 μA 27 μA
Antenna supply via Vant
Voltage range up to 5.0V
Max. allowed current 50 mA
L x W x H 17.8 x 16.5 x 7.1 mm
L x W x H 0.7” x 0.65” x 0.28”
Weight 4.0 g / 0.14 oz.
Operating -40°C to +85°C
Storage -40°C to +85°C
Humidity Non condensing
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