ULN2074B STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
STMicroelectronics ULN2074B is a 4-channel open-collector Darlington peripheral driver in 16-pin DIP with built-in transient suppression. Sinks high-current loads such as relays, solenoids, and stepper motors. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- ULN2074B Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $2.4700(MOQ 25)
- Temp Range
- -20.0°C to 85.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 4-channel Darlington transistor array with open-collector outputs rated to sink high inductive loads directly from logic-level inputs
- Integrated transient suppression diodes on each channel protect against back-EMF spikes from relays, solenoids, and motor coils
- Standard input characteristics accept signals from TTL, CMOS, and NMOS logic without additional interface components in 16-pin DIP
Applications
The ULN2074B is used to drive inductive loads such as relay coils, solenoids, stepper motor windings, and lamp drivers directly from low-current microcontroller or logic outputs. The 4-channel Darlington array with built-in flyback diodes makes it a compact, single-package solution for industrial control boards, home automation relay modules, and printer motor drive circuits. Its 16-pin DIP format simplifies prototyping and field-service replacement in through-hole designs.
Specifications
| YTEOL | 0 |
| Built-in Protections | TRANSIENT |
| Driver Number of Bits | 4 |
| Input Characteristics | STANDARD |
| Interface IC Type | BUFFER OR INVERTER BASED PERIPHERAL DRIVER |
| JESD-30 Code | R-PDIP-T16 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Characteristics | OPEN-COLLECTOR |
| Output Current Flow Direction | SINK |
| Output Current-Max | 1.5A |
| Output Polarity | TRUE |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Surface Mount | NO |
| Terminal Finish | Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Turn-off Time | 1.5 µs |
| Turn-on Time | 1 µs |
| ## ULN2074B Alternates Showing results | Image |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Malaysia |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ULN2074B:
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Frequently Asked Questions
How many output channels does the ULN2074B have and what types of loads can each channel drive?
The ULN2074B has 4 output channels, each capable of sinking high current through open-collector Darlington outputs; typical loads include relay coils, solenoids, stepper motor windings, and lamps operating at voltages up to the rated collector-emitter breakdown of the device.
Does the ULN2074B include protection against inductive kickback from relays and solenoids?
Yes, the ULN2074B integrates built-in transient suppression diodes on each output channel, clamping the back-EMF voltage spike generated when relay coils or solenoids are de-energized, which protects the Darlington transistors and upstream logic without external freewheeling diodes.
Can the ULN2074B inputs be driven directly from a 3.3 V microcontroller without level shifters?
The ULN2074B uses standard input characteristics compatible with TTL and CMOS logic levels; at 3.3 V supply, designers should verify the input high voltage threshold against their specific logic, but the standard Darlington input stage typically turns on reliably from a 3.3 V CMOS output with sufficient base current.
What package does the ULN2074B come in and how does it compare to the ULN2003A for a 4-channel relay board?
The ULN2074B uses a 16-pin DIP package and provides 4 channels, whereas the ULN2003A uses a 16-pin DIP with 7 channels; for a 4-relay board the ULN2074B may offer higher per-channel current ratings, while the ULN2003A is preferred when 7 channels are needed in the same footprint.
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| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 25+ | $4.0900 | $102.25 |
| 75+ | $2.5700 | $192.75 |
| 200+ | $2.5400 | $508.00 |
| 400+ | $2.4700 | $988.00 |
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