AP7370-50W5-7 - 300mA, 18V, 5V Fixed ULDO Regulator | Diodes Inc
N.º da peça: AP7370-50W5-7 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0.4 | $0,40 |
| 10 | $0.36 | $3,60 |
| 100 | $0.22 | $22,00 |
| 500 | $0.15 | $75,00 |
| 1.000 | $0.1 | $100,00 |
| 3.000 | $0.07 | $210,00 |
AP7370-50W5-7 Visão geral
An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly higher than the output - the dropout voltage is the minimum VIN-VOUT headroom required for regulation. LDOs are a subset of linear regulators, which in turn belong to the broader family of voltage regulators and power management ICs (PMICs). Unlike switching regulators, LDOs introduce no switching noise, making them the preferred choice for post-regulation after a switching converter, or as a stand-alone rail for noise-sensitive analog/RF loads.
Key features of the AP7370-50W5-7 include ±2% output voltage accuracy, integrated short-circuit current limit, thermal shutdown, and reverse-current protection that prevents current backflow when the input rail collapses below the output. The device operates over a -40 °C to +125 °C junction temperature range, is rated to a maximum junction temperature of +150 °C, and is qualified to the JEDEC JESD22-A114 power-cycling and MSL-1 moisture-sensitivity levels. The SOT-25 footprint occupies roughly 2.9 mm × 1.6 mm of board area, making the part one of the densest 300 mA ULDOs available in this voltage class.
The AP7370-50W5-7 is built on a CMOS process and uses a bandgap reference trimmed at wafer level. Its 2.5 µA quiescent current is among the lowest in the 300 mA / 5 V fixed class, and reverse-current protection eliminates the need for an external blocking diode when the part is powered from a USB rail that may be removed while the output capacitor holds charge. The output capacitor requires only a small ceramic (1 µF X7R is sufficient per the datasheet), simplifying BOM and reducing PCB area versus LDOs that need bulk tantalum or aluminum-polymer capacitors.
Typical applications include USB-powered devices, battery packs, smart meters, IoT sensor nodes, portable instrumentation, and standby rails in consumer electronics where standby current must remain below 5 µA. The wide 18 V input tolerance also makes it well suited to 12 V industrial bus rails and to post-regulation downstream of a buck converter.
When designing with this device, place the 1 µF ceramic input and output capacitors as close as possible to the IC pins to ensure loop stability, and verify that worst-case VIN-VOUT × IOUT stays within the SOT-25's thermal limits - for example, at VIN = 12 V, VOUT = 5 V, IOUT = 300 mA, the package must dissipate 2.1 W, which requires thermal copper pours.
This page synthesizes distributor pricing, SOT-25 drop-in alternatives (notably the TI TPS70950QDBVRQ1 used as a confirmed drop-in by mass-production designs), and practical thermal and PCB-layout notes that are not found together in the manufacturer datasheet.
Alternativas drop-in para AP7370-50W5-7 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com AP7370-50W5-7 (mesmo formato e footprint) — diferindo em Package, Input Voltage Range, MSL Level, Manufacturer, Operating Temperature Range.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AP7370-50WG-7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AP7375-50W5-7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AP7375-50WG-7
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AP7345D-3333RH4-7
✅ Drop-In✓ Em estoque
$0.26 / unidade
Ver ficha técnica →TPS70950QDBVRQ1
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
TPS70950DBVR
✅ Drop-In✓ Em estoque
$0.39 / unidade
Ver ficha técnica →AP7370-50W5-7 Classificações máximas e características elétricas
| Manufacturer | Diodes Incorporated |
| Part Number | AP7370-50W5-7 |
| Regulator Type | Linear, Low Dropout (LDO), Positive Fixed |
| Tensão de saída | 5.0 V (fixed, nominal) |
| Output Voltage Accuracy | ±2% |
| Faixa de tensão de entrada | up to 18 V (max) |
| Corrente de saída (máx.) | 300 mA |
| Tensão de dropout | 500-550 mV at 100 mA |
| Quiescent Current (Iq) | 2.5 µA (typ) |
| Output Capacitor | 1 µF ceramic (X7R) |
| Temperatura de junção de operação | -40 °C to +125 °C (max Tj 150 °C) |
| Protection Features | Short-Circuit Current Limit, Thermal Shutdown, Reverse-Current Protection |
| Encapsulamento | SOT-25 (5-pin, also referred to as SC-74A / SOT-753) |
| Tipo de montagem | Surface Mount |
| Nível MSL | MSL-1 (per JEDEC J-STD-020) |
| Status RoHS | Compliant |
Configuração de pinos do AP7370-50W5-7
| Pino 1 | VIN — Input voltage supply |
| Pino 2 | GND — Ground |
| Pino 3 | EN — Enable (active-high; tie to VIN for always-on) |
| Pino 4 | NC — Not connected (per datasheet) |
| Pino 5 | VOUT — Regulated 5.0 V output |
Aplicações típicas
AP7370-50W5-7 é adequado para 6 aplicaçãos: USB-Powered Device Rails, Battery-Powered IoT Sensor Nodes, Industrial 12 V Bus Post-Regulation, Portable Instrumentation & Metering, Standby / Always-On Rails in Appliances, After-Switching-Regulator Post-Filter.
USB-Powered Device Rails
The AP7370-50W5-7 is ideally suited for USB-powered device rails delivering a clean 5.0 V at up to 300 mA from a 5 V VBUS or from a higher step-down rail. According to the Diodes Incorporated datasheet, the part's integrated reverse-current protection eliminates the need for an external blocking diode at the USB input, while its 2.5 µA quiescent current keeps the system within the 100 µA USB suspend-current budget. The 18 V wide-input tolerance also tolerates USB-PD voltage transients on the input, making it a robust post-regulator after a buck converter.
Recomendado
Battery-Powered IoT Sensor Nodes
The AP7370-50W5-7 fits battery-powered IoT sensor nodes because its 2.5 µA quiescent current adds virtually no load during deep-sleep cycles, and its 300 mA output is more than sufficient to drive an MCU, sensor, and sub-GHz radio in burst. The 18 V input tolerance allows direct connection to a multi-cell battery or energy-harvester stack without a pre-regulator, and the reverse-current protection prevents battery backflow when the input collapses. Per the Diodes Incorporated datasheet, the SOT-25 footprint and 1 µF ceramic output cap minimize PCB area - critical for coin-cell or energy-harvester form factors.
Recomendado
Industrial 12 V Bus Post-Regulation
The AP7370-50W5-7 is well suited for industrial 12 V bus post-regulation downstream of a switching converter or directly from a 12 V / 24 V backplane (clamped by the 18 V input limit). The 300 mA continuous output supports relay drivers, optocouplers, and 5 V logic interfaces commonly used in PLC I/O cards and sensor interfaces. According to the Diodes Incorporated datasheet, the part's -40 °C to +125 °C junction temperature range and integrated thermal shutdown provide the headroom required for industrial enclosures with limited airflow, while ±2% output accuracy holds the 5 V rail within tolerance for downstream logic.
Recomendado
Portable Instrumentation & Metering
The AP7370-50W5-7 fits portable instrumentation such as handheld multimeters, smart meters, and field-test equipment. The 5 V fixed output powers an LCD driver, low-power MCU, and op-amp signal chain directly from a 9 V or 12 V battery. Per the Diodes Incorporated datasheet, the part's 2.5 µA quiescent current extends battery life between charges, while the wide-input tolerance handles rechargeable battery voltage swings from 6 V to 12.6 V without a pre-regulator. The thermal-shutdown and short-circuit protection are critical safety features for handheld products exposed to wiring faults.
Recomendado
Standby / Always-On Rails in Appliances
The AP7370-50W5-7 is a strong fit for standby or always-on 5 V rails in white goods and appliances, where the rail must remain live even when the main system is off so a low-power MCU can monitor buttons, IR receivers, or BLE wake-up events. Per the Diodes Incorporated datasheet, the 2.5 µA quiescent current keeps standby power below 10 mW (5 V × 2.5 µA), helping products meet IEC 62301 standby-power regulations. The 18 V input tolerance allows direct connection to rectified mains (post-cap) rails common in appliance designs.
Recomendado
After-Switching-Regulator Post-Filter
The AP7370-50W5-7 is commonly used as a post-filter (second-stage regulator) after a switching buck converter to clean up switching ripple on noise-sensitive analog or RF rails. The 300 mA output, 5 V fixed regulation, and 18 V input tolerance cover most 5 V analog/mixed-signal loads downstream of a 12 V or 9 V switching stage. According to the Diodes Incorporated datasheet, the LDO adds no high-frequency switching noise to the output, while its reverse-current protection prevents load-side voltage from feeding back into the switching converter during startup transients.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AP7370-50W5-7 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | AP7370-50WG-7 | AP7375-50W5-7 | AP7345D-3333RH4-7 | TPS70950QDBVRQ1 | TPS70950DBVR |
|---|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Texas Instruments | Texas Instruments |
| Package | SOT-25 | SOT-25 (same) | SOT-25 (same) | SOT-25 (same) | SOT-23-5 (DBV) (same footprint) | SOT-23-5 (DBV) (same footprint) |
| Output Voltage | 5.0 V fixed | 5.0 V fixed | 5.0 V fixed | 3.3 V + 3.3 V dual | 5.0 V fixed | 5.0 V fixed |
| Output Current (Max) | 300 mA | 300 mA | 300 mA | 300 mA total (dual) | 150 mA | 150 mA |
| Input Voltage (Max) | 18 V | 18 V | 18 V | 6 V | 30 V | 30 V |
| AEC-Q100 Automotive | No | No | No | No | Yes | No |
| Reverse-Current Protection | Yes | Yes | Yes | Yes | Yes | Yes |
| Unit Price (1k reel) | ~$0.10 | ~$0.10 | ~$0.12 | ~$0.18 | ~$0.55 | ~$0.45 |
Principais diferenciais
- Ultra-low 2.5 µA quiescent current for battery-powered standby (vs TPS70950QDBVRQ1)
- 300 mA continuous output vs 150 mA on TI alternative (vs TPS70950QDBVRQ1)
- Integrated reverse-current protection eliminates external blocking diode (vs AP7375-50W5-7)
- Wide 18 V input eliminates need for pre-regulator in 12 V industrial systems (vs AP7345D-3333RH4-7)
Notas de projeto
Estimated: at VIN = 12 V, VOUT = 5 V, IOUT = 300 mA, the AP7370-50W5-7 must dissipate approximately (12 V - 5 V) × 0.3 A = 2.1 W in the SOT-25 package. With the SOT-25 thermal resistance of about 200-250 °C/W on a 1 oz. 1 square-inch copper pour, junction temperature rises roughly 420-525 °C above 25 °C ambient - well above the 150 °C max Tj. Either reduce VIN-VOUT, derate output current, or increase copper area to at least 1-2 square inches plus thermal vias to a backside pour. For continuous 300 mA operation, consider the AP7375 family or the TPS70950QDBVRQ1 (150 mA, but thermally friendlier at 30 V input).
Per the Diodes Incorporated datasheet, place the 1 µF X7R input and output ceramic capacitors within 3 mm of the IC pins and use a solid ground plane under the device. The SOT-25 thermal pad (pin 4 NC, but exposed lead frame) should be soldered to a copper pour stitched with thermal vias for heat spreading. Avoid routing noisy switching traces beneath the LDO's input/output capacitors to prevent ripple injection. Keep the EN pin trace short; if unused, tie it directly to VIN.
Three pitfalls to avoid with the AP7370-50W5-7: (1) Do not exceed the 18 V absolute-maximum VIN - clamp transients from USB-PD or inductive loads; (2) The AP7370 family is marked "NOT RECOMMENDED FOR NEW DESIGN, USE AP7375" per the manufacturer datasheet - new designs should migrate to AP7375 or to a TI TPS70950 alternative to avoid future EOL; (3) The dropout voltage scales with load, so at 300 mA full load the dropout approaches ~1 V, which must be subtracted from VIN to keep VOUT in regulation across temperature.
Informações de conformidade
RoHS and lead-free per JLCPCB/LCSC listings and Diodes Incorporated product page. The part is not AEC-Q100 qualified - choose TPS70950QDBVRQ1 for automotive. Marked 'NOT RECOMMENDED FOR NEW DESIGN, USE AP7375' per the manufacturer datasheet cover page.
