motor drivers

ULN2803A

Every spec below is cited to the manufacturer datasheet. Pick your exact ordering code, compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the ULN2803A family does

The ULN2803A is a single-chip, eight-channel high-voltage Darlington transistor array designed to drive inductive loads like relays and stepper motors. It features built-in flyback diodes and delivers 500 mA per channel with a 50 V collector-emitter voltage rating. The device accepts TTL/CMOS logic inputs and operates across a -40°C to +85°C temperature range in both DIP18 and SOP18 packages. Engineers typically use this component for relay control, indicator lamp driving, and LED display applications where robust current switching and noise immunity are required.

Next step
Start building with ULN2803A → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

ULN2803A datasheet parameters

ParameterMinTypMaxConditionsSource
output current — 370 mA — DIP18, TPW = 25ms TA = 85°C TJ = 120°C, Duty = 10% Mixic datasheet, p. 3 — 推荐工作条件
supply voltage range 0 V — 50 V Mixic datasheet, p. 3 — 推荐工作条件
forward voltage — 1.7 V 2 V IF = 350mA (Figure 8); clamp UTD Semiconductor Co.,Limited datasheet, p. 4
operating temperature -40 °C — 85 °C Mixic datasheet, p. 3 — 推荐工作条件
power dissipation — — 760 mW TA = 85°C Mixic datasheet, p. 3 — 推荐工作条件
reverse voltage — — 50 V Mixic datasheet, p. 3 — 推荐工作条件
reverse leakage current — — 50 µA TA = 25°C, VR = 50V (Figure 7); clamp UTD Semiconductor Co.,Limited datasheet, p. 4
input capacitance — 15 pF 30 pF UTD Semiconductor Co.,Limited datasheet, p. 4
propagation delay — 150 ns 1 µs VL = 12V RL = 45Ω; tphl; 电参数特性表 Mixic datasheet, p. 4 — 电参数特性表
collector emitter voltage (abs max) -500 mV — 50 V collector; 6. Absolute Maximum Ratings UTD Semiconductor Co.,Limited datasheet, p. 3 — 6. Absolute Maximum Ratings
driver count (abs max) — — 8 Mixic datasheet, p. 3 — 绝对最大额定值
03 — Alternatives

Closest matches to ULN2803A

DRV8803 14.2× higher supply voltage range, 5.3× higher propagation delay, 4.1× higher output current
L293D 8.4× higher supply voltage range, 5.3× higher power dissipation, 2.4× higher operating temperature
TB67S109AFNG 10.8× higher output current, 6.7× higher propagation delay, 1.7× higher power dissipation
TB6612FNG 7.8× higher operating temperature, 5.4× higher output current, 1.4× lower forward voltage
TB67H450FNG 9.5× higher output current, 3.8× higher power dissipation, 3.3× higher propagation delay
TB67H451AFNG 9.5× higher output current, 3.8× higher power dissipation, 3.3× higher propagation delay
A4988 9.0× higher supply voltage range, 5.4× higher output current, 1.4× higher operating temperature
AP1511B 11.5× lower propagation delay, 2.1× higher supply voltage range, 1.9× higher operating temperature
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