DRDNB21D-7 - Dual Relay Driver Array, 100mA, SOT-363 | Diodes Inc
部品番号: DRDNB21D-7 ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0.62 | $0.62 |
| 10 | $0.54 | $5.40 |
| 100 | $0.42 | $42.00 |
| 500 | $0.35 | $175.00 |
| 1,000 | $0.28 | $280.00 |
| 3,000 | $0.22 | $660.00 |
DRDNB21D-7 概要
What is a relay driver array? A relay driver array is an integrated multi-component module that consolidates the discrete transistors, base resistors, and free-wheeling diodes typically required to drive electromechanical relays or similar inductive loads. By packaging these elements together, the array reduces PCB footprint, simplifies BOM, and improves reliability by eliminating wiring errors between discrete components. The DRDNB21D sits at the top of the discrete semiconductor hierarchy: relay driver array -> power switch/driver -> PMIC -> semiconductor device.
Key features include epitaxial planar die construction, integrated pre-biased transistor configuration that eliminates external base resistors, and built-in switching diodes that protect against back-EMF from inductive loads. The compact SOT-363 package measures only 2.0 mm × 1.25 mm × 0.95 mm, enabling high-density PCB layouts. Surface-mount termination supports tape-and-reel packaging for automated assembly processes, and the device is RoHS compliant.
The DRDNB21D-7 functions as a 1:1 low-side power switch with bipolar transistor technology. The integrated architecture allows each channel to sink up to 100 mA continuously, with internal base biasing networks sized to interface directly with logic-level microcontroller GPIO pins (typically 3.3 V or 5 V). The switching diodes are oriented to clamp inductive kickback when the relay coil is de-energized, protecting the driver transistors from reverse-voltage transients.
Typical applications include automotive relay modules, industrial control boards driving small signal relays or solenoids, HVAC control circuits, and home appliance switching subsystems. The device is also commonly used in telecom line cards and security system relay drivers where a compact, integrated solution reduces board area and assembly cost.
When designing with the DRDNB21D-7, ensure that the relay coil current does not exceed 100 mA per channel and that PCB traces to the relay can handle the peak inrush current. The integrated diodes eliminate the need for external flyback protection, but thermal management of the SOT-363 package becomes critical at high duty cycles above 50%.
This page synthesizes distributor pricing, drop-in alternatives, and design notes not found in the manufacturer datasheet alone, providing engineering decision support for sourcing and design.
ドロップイン代替品: DRDNB21D-7 — 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。
クイック比較ツール — 並列比較する代替部品を選択:
DRDNB21DWQ-7
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DRDNB21D-7-F
✅ ドロップイン📋 参考代替品（カタログ未掲載）
DRDNB21D-7 最大定格＆電気的特性
| Manufacturer | Diodes Incorporated |
| Part Number | DRDNB21D-7 |
| Part Description | Dual Relay Driver Array |
| Configuration | Complex Array (2 pre-biased NPN transistors + 2 switching diodes) |
| Switch Type | Power Switch/Driver 1:1 Bipolar |
| Output Current (Continuous) | 100 mA per channel |
| Number of Channels | 2 (dual) |
| Driver Type | Low Side |
| Transistor Technology | Bipolar NPN, Pre-Biased |
| Die Construction | Epitaxial Planar |
| パッケージ / ケース | 6-TSSOP, SC-88, SOT-363 |
| 実装タイプ | Surface Mount |
| MSLレベル | 1 |
| RoHS Compliance | Yes (RoHS Y) |
| Packaging | Tape & Reel (suffix -7) |
| トポロジー | Integrated base bias + flyback diode |
DRDNB21D-7 ピン構成
| ピン 1 | IN1 — Input/Base for channel 1 (pre-biased NPN) |
| ピン 2 | GND — Ground |
| ピン 3 | IN2 — Input/Base for channel 2 (pre-biased NPN) |
| ピン 4 | OUT2 — Output/Collector for channel 2 |
| ピン 5 | GND — Ground |
| ピン 6 | OUT1 — Output/Collector for channel 1 |
主な用途
DRDNB21D-7 の用途: 7 件s: Automotive Relay Module Driver, Industrial Control Relay Driver, HVAC Control Board Relay Switching, Home Appliance Switching Subsystem, Telecom Line Card Relay Driver, Security System Relay Output, Test Equipment Signal Relay Matrix.
Automotive Relay Module Driver
The DRDNB21D-7's 100 mA per channel continuous rating and integrated flyback diodes fit automotive relay modules controlling horns, lamps, and small motors. Two pre-biased NPN channels in one SOT-363 package drive two independent relays from logic-level GPIO (3.3 V or 5 V), eliminating external base resistors. The internal switching diodes clamp the inductive kickback that occurs when the relay coil de-energizes, protecting the transistors from reverse-voltage transients and removing the need for external snubbers. At 14 V automotive bus with typical relay coil currents of 50-80 mA, this array provides compact dual-relay control in a footprint smaller than discrete implementations. Designers should verify AEC-Q100 qualification when targeting automotive production; choose the Q-suffix variant DRDNB21DWQ-7 for IATF 16949 compliant automotive builds.
おすすめ
Industrial Control Relay Driver
Industrial control boards use the DRDNB21D-7 to drive small signal relays switching 24 V PLC outputs, solenoid valves, and indicator lamps at currents up to 100 mA per channel. The bipolar pre-biased configuration interfaces directly with 3.3 V or 5 V logic-level GPIO, removing the need for external base resistors and shrinking the BOM. Two integrated switching diodes protect against the inductive kickback from industrial relay coils, which can exceed 30 V reverse voltage if unclamped. The compact SOT-363 (SC-88) footprint enables high-density I/O modules, while the RoHS-compliant construction supports modern industrial designs. Pair with an optocoupler such as the ADUM1402CRWZ-RL for galvanic isolation between the logic controller and field-side relay circuitry in safety-critical industrial systems.
おすすめ
HVAC Control Board Relay Switching
The DRDNB21D-7 is well-suited for HVAC control boards driving small relays and contactors that switch fan motors, compressor contactor coils, and damper actuators. Its 100 mA per channel capability covers typical 24 VAC relay coil currents, while the integrated flyback diodes absorb the inductive kickback produced when the relay coil is de-energized. The SOT-363 surface-mount package supports automated assembly processes required for high-volume HVAC production. Two channels in one package reduce PCB footprint by approximately 50% versus discrete implementations, allowing more compact control board layouts. The device's bipolar NPN architecture operates reliably across the -40C to +85C industrial temperature range typical of HVAC equipment closets and outdoor units.
おすすめ
Home Appliance Switching Subsystem
Home appliances including washing machines, dishwashers, and microwave ovens use the DRDNB21D-7 to drive small relays that switch valve solenoids, door locks, and indicator lamps. The 100 mA per channel rating matches typical appliance relay coil currents of 30-80 mA, and the dual-channel SOT-363 package consolidates two driver channels into one component. The integrated switching diodes protect against inductive kickback from the relay coils, eliminating external snubber components and reducing BOM cost. Pre-biased transistor inputs interface directly with 3.3 V or 5 V logic signals from appliance MCUs. The RoHS-compliant construction and MSL 1 rating support modern lead-free reflow profiles used in high-volume consumer appliance manufacturing.
おすすめ
Telecom Line Card Relay Driver
Telecom line cards and central-office switching equipment use the DRDNB21D-7 to drive small reed relays and signal-switching relays that route voice and data circuits. The 100 mA continuous rating suits low-power telecom relay coils, while the dual-channel SOT-363 package enables high-density line card designs with hundreds of relays. Pre-biased NPN inputs interface with 3.3 V logic from telecom control ASICs, eliminating base resistors and simplifying layout. The integrated flyback diodes protect against inductive transients from the relay coils, ensuring reliable operation across the telecom equipment's 20+ year deployment lifetime. The compact SC-88 (SOT-363) footprint also supports automated optical-inspection processes used in telecom manufacturing.
おすすめ
Security System Relay Output
Security alarm panels and access control systems use the DRDNB21D-7 to drive output relays that switch sirens, strobe lights, door strikes, and auxiliary notification circuits. The 100 mA per channel continuous rating covers typical security relay coil currents, and the integrated switching diodes clamp the inductive flyback generated when each relay coil is de-energized. The SOT-363 surface-mount footprint supports high-density I/O boards with multiple zone outputs. Pre-biased NPN inputs interface directly with security panel MCUs at 3.3 V or 5 V logic, removing external base resistor components. The bipolar architecture provides robust transient immunity required for the electrically noisy environments typical of security installations.
おすすめ
Test Equipment Signal Relay Matrix
Automated test equipment (ATE) and bench instruments use the DRDNB21D-7 to drive reed relays and signal relays in test point switching matrices, multiplexer channels, and calibration circuits. The 100 mA per channel capability suits low-power signal relays, while the integrated flyback diodes protect against inductive transients. The dual-channel SOT-363 footprint enables high-density switching matrices with hundreds of test points. Pre-biased NPN inputs interface with 3.3 V or 5 V logic from test instrument MCUs and DSP controllers, eliminating external base biasing components. The compact SC-88 outline also simplifies routing on densely populated ATE PCBs with many relay channels.
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: DRDNB21D-7 — 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 | DRDNB21DWQ-7 | DRDNB21D-7-F |
|---|---|---|---|
| Package | SOT-363 (SC-88) | SOT-363 (SC-88) - same | SOT-363 (SC-88) - same |
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated |
| Output Current per Channel | 100 mA | 100 mA | 100 mA |
| Number of Channels | 2 | 2 | 2 |
| Integrated Flyback Diodes | Yes (2) | Yes (2) | Yes (2) |
| Automotive Grade (AEC-Q100) | No | Yes (AEC-Q100) | No |
| Pre-Biased Inputs | Yes (internal base resistors) | Yes | Yes |
| RoHS Compliance | Yes | Yes | Yes |
主な差別化要因
- Integrated pre-biased transistors eliminate external base resistors （vs Discrete 2N+ transistor + base resistor solution)
- Integrated switching diodes for inductive flyback protection （vs Discrete flyback diode solution)
- Compact SOT-363 (SC-88) 6-pin package （vs Larger SO-8 or DPAK discrete relay drivers)
設計ノート
Estimated: At 100 mA per channel continuous, with VCE(sat) of approximately 0.2 V, each channel dissipates roughly 20 mW. Both channels operating simultaneously produce 40 mW total dissipation in the SOT-363 package. With SOT-363 theta_JA around 350 C/W typical, junction temperature rise above ambient is approximately 14 C, well within safe operating limits. Avoid sustained operation above 50% duty cycle at 100 mA per channel in enclosed housings without forced airflow.
Place the DRDNB21D-7 close to the relay coils to minimize trace inductance and ensure effective flyback protection. Use a ground plane on the layer beneath the SOT-363 footprint for heat spreading, and connect both GND pins (2 and 5) directly to the ground plane with short traces. Input traces from the controlling GPIO should be kept short and routed away from the inductive relay outputs to avoid noise coupling. Follow the recommended reflow profile in the JEDEC J-STD-020 specification for MSL 1 parts.
Do not exceed 100 mA per channel continuous - the SOT-363 package cannot dissipate the heat from higher currents reliably. Verify the relay coil current under worst-case cold conditions (coil resistance drops at low temperatures, increasing inrush current). Ensure the GPIO drive voltage meets the pre-biased transistor's input VIH threshold; 3.3 V logic may require verification against the datasheet minimum input voltage for full turn-on. Do not use this part for high-side switching - the DRDNB21D-7 is designed for low-side drive only.
Route the relay coil return (the relay's switched-side) directly to the DRDNB21D-7 output pin and through the device to GND, rather than back through a shared ground path. This minimizes ground bounce during switching. Keep the integrated flyback diode paths short - even though the diodes are internal, long PCB traces to the relay coil add parasitic inductance that the diodes must clamp. Use 2 oz copper on power rails feeding the relay coils to handle the inrush current without significant voltage drop.
コンプライアンス情報
RoHS compliant per Diodes Incorporated product page and PartGenie listing. MSL 1 rated per JEDEC J-STD-020. Choose DRDNB21DWQ-7 for AEC-Q100 qualified automotive builds per the Diodes Incorporated datasheet PCN note. REACH, halogen-free, and conflict minerals status not explicitly stated in verified data.
