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
What are the key features of ULN2074B?
- 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
What is ULN2074B used for?
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.
What are the specifications of ULN2074B?
| 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 |
Where can I find the ULN2074B datasheet?
ULN2074B Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for ULN2074B?
Compatible alternatives and drop-in replacements for ULN2074B:
suggested
suggested
suggested
suggested
suggested
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.
Related Guides
SN74LVC14APWR Schmitt-Trigger Inverter Selection Guide
Select SN74LVC14APWR by voltage, thresholds, package, alternatives, and sourcing requirements before approving your next order.
Nov 8, 2026
RK73H1ETTP1002F PCB Application and Validation Guide
Implement RK73H1ETTP1002F in pull-ups, dividers, and bias filters with practical power, leakage, assembly, and validation checks.
Nov 8, 2026
TLMG1100-GS08 Indicator LED PCB Design and Validation Guide
Design and validate a TLMG1100-GS08 indicator PCB with current calculations, GPIO checks, polarity review, and enclosure tests.
Nov 7, 2026
How to Choose RK73H1ETTP1002F: Chip Resistor Selection Guide 2026
Select RK73H1ETTP1002F for 10 kΩ circuits: compare four catalog options, check power and package limits, and prepare an exact-part sourcing request.
Nov 7, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| 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 |
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“FindMyChip sourced our entire STM32 BOM in 48 hours when our usual distributor had 16-week lead times.”
You May Also Like
ACS770ECB-200U-PFF-T
Allegro Microsystems
Integrated Circuit
ACS770KCB-150U-PFF-T
Allegro Microsystems
Integrated Circuit
MC33901WEF
NXP
Integrated Circuit
MC7808BDTRKG
ON Semiconductor
Integrated Circuit
PA94EC
Apex Microtechnology
Integrated Circuit
AP7315-28SR-7
Diodes Inc.
Integrated Circuit
74HCT245D
Nexperia
Integrated Circuit
CY62256VNLL-70ZXCT
Cypress Semiconductor
Integrated Circuit
EPM7032AETC44-4N
Intel
Integrated Circuit
EPM3512AQC208-10N
Intel
Integrated Circuit
EPM3256ATC144-7N
Intel
Integrated Circuit
EPM3256AQC208-7N
Intel
Integrated Circuit
EPM3256AQC208-10N
Intel
Integrated Circuit
EPM3128ATC100-7N
Intel
Integrated Circuit
EPM1270F256C4N
Intel
Integrated Circuit
EPF8282ATC100-4N
Intel
Integrated Circuit
EPF6016QC208-2N
Intel
Integrated Circuit
EPF6016ATC144-3N
Intel
Integrated Circuit
EPF10K30ATC144-3N
Intel
Integrated Circuit
EPC2TI32N
Intel
Integrated Circuit
EPC2LC20
Intel
Integrated Circuit
EP3SL150F1152C4N
Intel
Integrated Circuit
EP2SGX60DF780C5N
Intel
Integrated Circuit
EP2SGX60CF780C5N
Intel
Integrated Circuit