ULN2003AN - 50V 500mA 7-Ch Darlington Array | TI | DIP-16
部品番号: ULN2003AN ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.55 | $5.50 |
| 100 | $0.42 | $42.00 |
| 500 | $0.36 | $180.00 |
| 1,000 | $0.31 | $310.00 |
ULN2003AN 概要
A Darlington transistor array is a class of bipolar (BJT) integrated circuit that bundles multiple high-gain Darlington pairs on a single die, acting as a low-side driver. Within the broader taxonomy, it belongs to the discrete transistor category, sits below generic BJT arrays, and is widely classified as an interface/driver IC for relay, lamp, and motor loads. The ULN2003 family is the de-facto industry standard for 7-channel low-side switching from logic-level inputs, making it one of the longest-lived and most cloned ICs in the market.
Key features include seven identical Darlington output stages, 50V minimum collector-emitter sustaining voltage, 500 mA continuous collector current per channel (peak to 600 mA), built-in output clamp diodes for inductive load protection, inputs compatible with TTL/CMOS/PMOS/DTL logic, and an operating junction temperature range up to 150 C. The input pins present a series base resistor suitable for 3.3V and 5V logic; no external resistor network is required.
Architecturally, each channel pairs a driver transistor (Q1) and an output transistor (Q2) to multiply beta, with integrated 2.7 kohm base resistors on every input. This monolithic bipolar process yields predictable saturation behavior (Vce(sat) ~0.9-1.0V at low currents, ~1.1V at 350 mA) but introduces a measurable Vce drop that dissipates substantial power in high-current applications.
Typical applications include 5V relay driver cards, unipolar stepper motor driver boards (commonly paired with 28BYJ-48 motors), LED matrix row/column drivers, solenoid valves, DC brushed motor direction switches, and lamp/display drivers. Hobby and educational platforms (Arduino shields, Raspberry Pi HATs) frequently adopt the ULN2003AN because of its robust 500 mA rating and zero-firmware footprint.
Designers should budget headroom for the ~1V collector-emitter saturation drop and derate output current as duty cycle rises. The thermal resistance of PDIP-16 (theta_JA ~70 C/W typical) limits total package dissipation to roughly 1.5W without airflow, so high-current loads should be distributed across multiple channels rather than concentrated on a single pair.
This page synthesizes distributor pricing for the original TI part plus cloned second-source options, a drop-in alternative table for sourcing resilience, and practical PCB/application guidance beyond what the manufacturer datasheet covers in isolation.
ドロップイン代替品: ULN2003AN — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: ULN2003AN （同一形状・フットプリント） — 相違点: Package, Mounting Type, Logic Compatibility, Operating Temperature Range, RoHS Status.
クイック比較ツール — 並列比較する代替部品を選択:
ULN2003ANE4
✅ ドロップイン✓ 在庫あり
$0.12 / 個
データシートを見る →ULN2003AD
✅ ドロップイン✓ 在庫あり
$0.0843 / 個
データシートを見る →ULN2003AN
✅ ドロップイン✓ 在庫あり
$0.31 / 個
データシートを見る →ULN2003AN
✅ ドロップイン✓ 在庫あり
$0.31 / 個
データシートを見る →ULN2003AN
✅ ドロップイン✓ 在庫あり
$0.31 / 個
データシートを見る →ULN2003AD
✅ ドロップイン✓ 在庫あり
$0.0843 / 個
データシートを見る →ULN2003AN 最大定格＆電気的特性
| トランジスタタイプ | 7 x NPN Darlington Pair Array |
| Number of Channels | 7 |
| Collector-Emitter Voltage (Vce Max) | 50 V |
| Continuous Collector Current (Ic, single output) | 500 mA |
| Peak Collector Current | 600 mA |
| DC Current Gain (hFE, typical) | 1000 (min) |
| Vce(sat) at 100mA | 0.9 V to 1.0 V typical |
| Vce(sat) at 350mA | 1.1 V typical |
| Input Base Resistance | 2.7 kohm integrated |
| Clamp Diodes | Yes (common cathode to COM pin) |
| 動作温度範囲 | -20 C to +85 C (TI datasheet) |
| Junction Temperature (max) | 150 C |
| パッケージ | 16-PDIP (N) through-hole |
| 実装タイプ | Through Hole |
| Logic Compatibility | TTL, CMOS, DTL, PMOS, 5V/3.3V microcontrollers |
| RoHS ステータス | Compliant (lead-free N suffix) |
ULN2003AN ピン構成
| ピン 1 | 1B — Input 1 (base of Darlington pair 1, with 2.7 kohm series resistor) |
| ピン 2 | 2B — Input 2 (base of Darlington pair 2) |
| ピン 3 | 3B — Input 3 (base of Darlington pair 3) |
| ピン 4 | 4B — Input 4 (base of Darlington pair 4) |
| ピン 5 | 5B — Input 5 (base of Darlington pair 5) |
| ピン 6 | 6B — Input 6 (base of Darlington pair 6) |
| ピン 7 | 7B — Input 7 (base of Darlington pair 7) |
| ピン 8 | GND — Ground (emitter common for all seven Darlington pairs) |
| ピン 9 | COM — Common cathode of clamp diodes - tie to inductive load supply |
| ピン 10 | 7C — Output 7 (open collector of Darlington pair 7) |
| ピン 11 | 6C — Output 6 (open collector of Darlington pair 6) |
| ピン 12 | 5C — Output 5 (open collector of Darlington pair 5) |
| ピン 13 | 4C — Output 4 (open collector of Darlington pair 4) |
| ピン 14 | 3C — Output 3 (open collector of Darlington pair 3) |
| ピン 15 | 2C — Output 2 (open collector of Darlington pair 2) |
| ピン 16 | 1C — Output 1 (open collector of Darlington pair 1) |
主な用途
ULN2003AN の用途: 6 件s: Relay Driver Boards (5V/12V/24V Coils), Unipolar Stepper Motor Driver (28BYJ-48 / 35BYJ46), LED Matrix Row/Column Drivers, Solenoid Valve and Actuator Switching, Hobby and Educational Microcontroller Projects, Industrial Control and Automation Interfaces.
Relay Driver Boards (5V/12V/24V Coils)
The ULN2003AN directly switches 5V, 12V and 24V relay coils from logic-level GPIOs because each of its seven Darlington channels handles 50V Vce and 500 mA continuous collector current, with the COM pin tied to the relay supply for inductive clamp-recovery. Place the IC's input pins on the microcontroller side and the relay coil flyback diodes (already internal, COM pin) absorb the inductive kickback, eliminating the need for external snubbers per the TI typical application circuit. Compared with discrete MOSFET designs, the ULN2003AN saves roughly 14 components and footprint area while surviving coil overvoltage transients up to 50V.
おすすめ
Unipolar Stepper Motor Driver (28BYJ-48 / 35BYJ46)
The ULN2003AN is the de-facto driver for 5V and 12V unipolar stepper motors, switching all four phase windings plus optional indicator LEDs on its seven available channels. Each channel's 500 mA continuous rating comfortably exceeds the 240 mA typical phase current of the 28BYJ-48 motor at full-step drive, while the 50V Vce rating provides more than 4x headroom above the 12V motor supply for inductive transients. The TI datasheet typical stepper application shows direct GPIO-to-input mapping, allowing Arduino/ESP32 microcontrollers to sequence the motor with simple HIGH/LOW patterns and no firmware compensation for Vce drop.
おすすめ
LED Matrix Row/Column Drivers
The ULN2003AN serves as a low-side current sink for LED matrix displays and 7-segment multiplexed drivers. With seven open-collector outputs each rated at 500 mA, the IC can drive seven independent LED rows or columns without external transistors; the COM pin can be repurposed as a high-side enable or simply left tied to the LED supply. For matrix systems, multiple ULN2003ANs chain across rows/columns, and the bipolar Darlington saturation drop (~0.9V at low currents) introduces uniform dimming factor across the array - a feature exploited in monochrome sign-board designs.
おすすめ
Solenoid Valve and Actuator Switching
The ULN2003AN drives 12V and 24V solenoid valves, latching actuators, and small DC brushed motor windings from microcontrollers like the Arduino Uno or Raspberry Pi, leveraging its 500 mA per-channel capability and integrated clamp diodes for the inductive kick. For proportional control or PWM dimming, the Darlington's slow turn-off (~microseconds) limits switching frequency compared with MOSFET alternatives like the TBD62003, but for on/off solenoid control it is well-suited and widely available. Plan heatsinking if more than 2-3 channels operate continuously at 300 mA or above, since PDIP-16 theta_JA is approximately 70 C/W.
おすすめ
Hobby and Educational Microcontroller Projects
The ULN2003AN is a foundation component for Arduino, Raspberry Pi, and ESP32 projects because its inputs are 3.3V/5V-TTL/CMOS compatible and require no external resistors. From the 8-output ULN2803 educational comparisons to the seven-channel 'L293D alternative' discussions in forums, the ULN2003AN functions as the standard learning IC for relay/stepper/motor projects. Its PDIP-16 form fits easily on breadboards, and second-source clones at $0.09 enable cost-sensitive kits without compromising educational value.
おすすめ
Industrial Control and Automation Interfaces
The ULN2003AN's 50V/500 mA bipolar ratings are validated for industrial 24V PLC output stages, machine-tool indicator lamps, and process-control panel interfacing where the IC functions as an optocoupler-to-load driver. The TI datasheet confirms operation from -20 C to +85 C, and its 16-pin PDIP construction survives vibration and conformal coating treatments in factory-automation enclosures. Compared with solid-state relays (SSRs), the ULN2003AN is far lower cost per channel and compatible with bipolar logic-level signals from PLC discrete outputs.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: ULN2003AN — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | ULN2003ANE4 | ULN2003AD | ULN2003AN (HGSEMI) | ULN2003AN (XBLW) | ULN2003AN (TAEJIN) | ULN2003A (ST) |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | HGSEMI | XBLW | TAEJIN | STMicroelectronics |
| Package | 16-PDIP (N) | 16-PDIP (N) - same | 16-PDIP (N) - same | 16-PDIP - same | 16-DIP - same | 16-DIP - same | 16-PDIP - same |
| Number of Channels | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Vce(max) | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V | 50 V |
| Continuous Collector Current | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA | 500 mA |
| Input Compatibility | 3.3V/5V TTL/CMOS | 3.3V/5V TTL/CMOS | 3.3V/5V TTL/CMOS | 3.3V/5V TTL/CMOS | 3.3V/5V TTL/CMOS | 5V TTL | 3.3V/5V TTL/CMOS |
| Clamp Diodes | Yes (COM pin) | Yes | Yes | Yes | Yes | Yes | Yes |
主な差別化要因
- Industry-standard 7-channel Darlington in PDIP-16 （vs Discrete transistor designs)
- Wider sourcing base than ULN2803 （vs ULN2803APG)
- Lower-cost second-source options without re-spin （vs TI-only supply chain)
- Integrated clamp diodes eliminate snubber network （vs Discrete Darlington array without COM pin)
設計ノート
Estimated: PDIP-16 theta_JA is approximately 70 C/W (per TI package thermal metrics); running all seven channels at 350 mA continuously with Vce(sat) ~1.1V yields approximately 2.7W total dissipation, raising junction temperature roughly 189 C above ambient. Limit continuous operation above 250 mA per channel or distribute load across two ULN2003AN ICs. If multi-channel continuous high-current drive is unavoidable, add a small clip-on heatsink on the PDIP body or switch to the SOIC-16 ULN2003ADR variant with thermal pad.
Keep the COM-pin trace short and tie it directly to the inductive-load supply rail (typically +12V or +24V) for relay/stepper applications. Place a 0.1 uF ceramic decoupling capacitor between VCC (logic input side) and GND near the IC even though the ULN2003AN does not draw VCC supply current - this prevents microcontroller noise from coupling into the input base resistors. Maintain at least 2 mm spacing between the ULN2003AN outputs and adjacent low-voltage analog traces, because collector swings up to 50V can inject noise into nearby signals.
Do not exceed 500 mA continuous per channel and never exceed 600 mA peak. Remember the ~1V Vce(sat) drop dissipates significant power at high currents - it is NOT a MOSFET low-drop switch. Do not leave the COM pin floating when driving inductive loads, as the open-cathode clamp diodes cannot protect outputs against flyback voltage without COM tied to the supply. Pin 9 must also not be tied to ground - this shorts the clamp diodes and disables inductive protection.
The Darlington's intrinsic capacitance on the input base (due to integrated 2.7 kohm resistor and base-emitter junction) limits switching speed to roughly 1 us rise/fall time. This is acceptable for relay and stepper sequencing (typical step rates 100 Hz-1 kHz) but unsuitable for high-frequency PWM motor control above 10 kHz - consider the Toshiba TBD62003 or TI TPL7407LA as MOSFET alternatives for high-frequency switching.
コンプライアンス情報
TI ULN2003AN carries the N suffix denoting lead-free RoHS-compliant terminals. The part is not AEC-Q100 qualified; for automotive applications consult TI automotive-grade Darlington parts. Halogen-free and conflict-mineral status not explicitly cited in distributor snippet - set to unknown.
