hcpl 3120 – 2.5a igbt gate drive optocoupler – broadcom / avago technologies

HCPL-3120 – 2.5A IGBT Gate Drive Optocoupler

Key features:

  • Peak output current: 2.5A
  • High CMR: 25 kV/µs minimum
  • Supply voltage: 15V to 30V
  • UVLO protection with hysteresis
  • Fast switching speed: 500ns max
  • Low output voltage: 0.5V max
  • Low supply current: 5mA max
  • Operating temperature: -40°C to +100°C
  • Isolation voltage: 3750Vrms
  • DIP-8 package
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The HCPL-3120 is a high-performance IGBT/MOSFET gate drive optocoupler manufactured by Broadcom (formerly Avago Technologies and Agilent Technologies) . It consists of a GaAsP light-emitting diode (LED) optically coupled to an integrated circuit with a power output stage, providing complete electrical isolation between input and output circuits .

This optocoupler is ideally suited for directly driving power IGBTs and MOSFETs used in motor control inverter applications. The high operating voltage range of the output stage (15V to 30V) provides the gate drive voltages required by power switching devices. The high peak output current of 2.5A makes it capable of directly driving IGBTs rated up to 1200V/100A .

Key design advantages include:

  • UVLO protection with hysteresis ensures the IGBT/MOSFET is not driven in linear mode (under-saturated) under low voltage conditions

  • High CMR of 25 kV/µs prevents false triggering in noisy industrial environments

  • Low VOL (0.5V max) allows the use of a single positive supply (no negative gate bias needed)

  • Built-in shielding for outstanding noise immunity

The HCPL-3120 is available in multiple package variants:

  • HCPL-3120: Standard DIP-8 package

  • HCPL-J312: Higher insulation voltage (VIORM = 1230Vpeak)

  • HCNW3120: Highest insulation voltage (VIORM = 1414Vpeak) in a wide-body package

Parameters

Parameters Specifications
Manufacturer Broadcom / Avago Technologies
Part Number HCPL-3120
Number of Channels 1
Output Type Gate Driver (Push-Pull)
Peak Output Current (Max) 2.5A
Peak Output Current (Min) 2.0A
Supply Voltage (Vcc – Vee) 15V to 30V (operating)
Maximum Supply Voltage 35V
Output High Voltage Vcc – 2.5V (min)
Output Low Voltage (VOL) 0.5V maximum
Supply Current (Icc) 5mA maximum
Input Forward Current (IF) 10mA typical, 25mA absolute max
Peak Input Current 16mA
Switching Speed 500ns maximum
Propagation Delay (tPHL / tPLH) 500ns maximum
Common Mode Rejection (CMR) 25 kV/µs minimum at Vcm = 1500V
Isolation Voltage (HCPL-3120) 3750 Vrms for 1 min (UL)
Operating Temperature -40°C to +100°C
Storage Temperature -55°C to +125°C
Package Type DIP-8 (0.300″, 7.62mm)
Mounting Type Through Hole
RoHS Compliant Yes (-xxxE suffix denotes lead-free)

Applications

  • IGBT and MOSFET gate drive – Direct drive for IGBTs up to 1200V/100A

  • AC motor drives and brushless DC motor drives – Industrial motor control inverters

  • Industrial inverters – Variable frequency drives (VFDs)

  • Switch mode power supplies (SMPS) – Isolated power conversion

  • Solar inverters – Renewable energy power conversion systems

  • Electric vehicle (EV) and hybrid vehicle systems – Battery management and motor control

  • Robotics and industrial automation – Isolated control interfaces

  • Welding equipment – High-power switching applications

Pin Configuration (8-pin DIP)

 
Pin Name Description
1 NC No Connection
2 ANODE LED Anode (Input +)
3 CATHODE LED Cathode (Input -)
4 NC No Connection
5 VEE Negative Supply / Ground
6 VO Output (Gate Drive)
7 VO Output (Gate Drive)
8 VCC Positive Supply (15V-30V)

Note: A 0.1µF bypass capacitor must be connected between pins 5 and 8 .

Important Notes:

  • The HCPL-3120 is an active, in-production device

  • For surface-mount applications, refer to HCPL-3120-500E (tape and reel) or HCPL-3120-300E(surface mount)

  • For lead-free (RoHS compliant) versions, order with -xxxE suffix (e.g., HCPL-3120-000E)

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