STMicroelectronics E-L6220

Overview

E-L6220 from STMicroelectronics is a monolithic quad Darlington switch IC designed for high-current, high-voltage inductive load switching. It integrates four independent Darlington drivers (two non-inverting, two inverting), a common inhibit input, integral fast recirculation diodes, TTL-compatible logic inputs, and supports 50 V output voltage and 1.8 A continuous per-channel current. Used in stepper motor drivers and relay/valve control circuits.

For engineers reviewing the E-L6220 datasheet, E-L6220 pinout, E-L6220 application, or E-L6220 equivalent, key selection criteria include output saturation voltage (1.6 V @ 1.8 A), thermal resistance (3 °C/W junction-to-case for Multiwatt-15), clamp diode forward voltage (2.0 V @ 1.8 A), truth table behavior under inhibit control, and package-specific mounting requirements for thermal management.

Technical Context

The E-L6220 implements a dual-mode logic interface with two non-inverting and two inverting inputs, all gated by a single active-low INHIBIT signal that disables all outputs simultaneously. Its internal architecture combines open-collector Darlington transistors with integrated clamp diodes tied in pairs (CLAMP A for Drivers 1–2, CLAMP B for Drivers 3–4), enabling safe energy recirculation during inductive turn-off.

Each channel shares a common emitter node and supports paralleling of inputs/outputs for higher current capability. The device operates with a 4.5–5.5 V logic supply (Vs), tolerates up to 7 V absolute max, and features low-input-current TTL-compatible thresholds (I_INH ≤ ±10 µA, V_INL ≤ 0.8 V, V_INH ≥ 2.0 V), ensuring direct interfacing with microcontrollers and logic families.

Key Specifications

Pinout & Package

Package: Multiwatt-15 plastic package (15-lead vertical mount), thermally optimized with low R_{th j–case} = 3 °C/W. GND pins (pins 1, 14, 15) must be soldered to PCB copper area or heatsink for thermal compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad Darlington switching applications.

Compared with ULN2803A and TB6549FG, the E-L6220 uniquely balances high per-channel current (1.8 A), integrated inhibit control, and Darlington-level voltage gain-making it optimal for cost-sensitive, high-reliability unipolar stepper and relay systems where simplicity and thermal margin are critical.

Availability

E-L6220 is available at Aetrix Electronics and suitable for industrial relay driving, unipolar stepper motor control, DC solenoid actuation, and valve interface applications requiring stable component supply and long-term lifecycle support.

Supply support for E-L6220 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in power management, analog, microcontrollers, and discrete devices for industrial, automotive, and consumer markets.

The L62xx series was developed specifically for high-voltage, high-current industrial interface applications-emphasizing ruggedness, integrated protection, and simplified PCB layout for electromechanical control systems.

FAQ

What is the maximum allowable ambient temperature for continuous 1.8 A operation per channel?

At 1.8 A per channel and full conduction, the E-L6220 in Multiwatt-15 package requires a maximum ambient temperature of 70 °C to stay within its 20 W total power dissipation limit at T_case = 90 °C. This assumes proper heatsinking via GND pins to ≥10 cm² copper area or external heatsink with R_{th j–amb} ≤ 35 °C/W.

Can IN1–IN4 be driven directly from a 3.3 V microcontroller GPIO?

No-E-L6220 requires TTL-compatible input thresholds: V_INH ≥ 2.0 V (min) and V_INL ≤ 0.8 V (max). While 3.3 V logic may exceed the high threshold, its output low voltage (often >0.4 V) risks marginal noise immunity. A 5 V buffer or level shifter is recommended for reliable operation.

How does the CLAMP A and CLAMP B functionality differ from standard flyback diodes?

CLAMP A and CLAMP B are shared-cathode nodes connecting the anodes of fast recirculation diodes across Driver 1+2 and Driver 3+4 respectively. Unlike discrete diodes per channel, this topology reduces component count and PCB area but requires careful routing to avoid cross-talk-especially when only one driver in a pair is active.

Is the E-L6220 pin-compatible with the L6220N?

Yes-the E-L6220 is the commercial-grade variant of the L6220N, sharing identical Multiwatt-15 pinout, electrical specifications, and thermal characteristics. Both use the same 15-lead package outline, terminal numbering, and functional pin assignments per the STMicroelectronics datasheet Rev. September 2003.