SFP Controller with Dual LDD Interface

Industry's First Dual Tx Controller for Video SFP Modules

Please check latest availability status for a specific part variant.


The DS1876 controls and monitors all functions for dual transmitter modules. The memory map is based on SFF-8472. The DS1876 supports APC and modulation control and eye safety functionality for two laser drivers. It continually monitors for high output current, high bias current, and low and high transmit power to ensure that laser shutdown for eye safety requirements are met without adding external components. Six ADC channels monitor VCC, temperature, and four external monitor inputs that can be used to meet all monitoring requirements.
DS1876: Typical Operating Circuit DS1876: Typical Operating Circuit Enlarge+

Key Features

  • Meets All SFF-8472 Transmitter Control and Monitoring Requirements
  • Six Analog Monitor Channels: Temperature, VCC, PMON1, BMON1, PMON2, BMON2
    • PMON_ and BMON_ Support Internal and External Calibration
    • Scalable Dynamic Range
    • Internal Direct-to-Digital Temperature Sensor
    • Alarm and Warning Flags for All Monitored Channels
  • Six Quick Trips for Fast Monitoring of Critical Functions for Laser Safety
  • Four 10-Bit Delta-Sigma Outputs
    • Each Controlled by 72-Entry Temperature Lookup Table (LUT)
  • Digital I/O Pins: Six Inputs, Five Outputs
  • Comprehensive Fault Measurement System with Maskable Laser Shutdown Capability
  • Flexible, Two-Level Password Scheme Provides Three Levels of Security
  • 256 Additional Bytes Located at A0h Slave Address
  • Transmitter 1 Is Accessed at A2h Slave Address
  • Transmitter 2 Is Accessed at B2h Slave Address
  • I²C-Compatible Interface
  • +2.85V to +3.9V Operating Voltage Range
  • -40°C to +95°C Operating Temperature Range
  • 28-Pin TQFN (5mm x 5mm x 0.8mm) Package


  • Dual Tx Video SFP Modules

See parametric specs for Fiber Monitoring and Control (14)

Part NumberADCsResolution
# DACs/ ResistorsFS Out
StepsTemp. SensorMemoryVSUPPLY
Control InterfacePackage/PinsBudgetary
(See Notes)
DS1876 5-Input Muxable134 DACsNoneNoneInternalEEPROM2.85 to 3.9I2C
$1.76 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
Product Reliability Reports: DS1876.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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