BTS3205NHUSA1 - 42V 0.7Ω Low-Side HITFET Switch | Infineon
N.º de pieza: BTS3205NHUSA1 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $1.14 | $1,14 |
| 10 | $1.02 | $10,20 |
| 100 | $0.87 | $87,00 |
| 500 | $0.74 | $370,00 |
| 1.000 | $0.63 | $630,00 |
BTS3205NHUSA1 Descripción general
A low-side switch is a type of power distribution switch that places the MOSFET between the load and ground, sinking current when activated. Low-side switches belong to the broader category of smart power switches, which sit in the hierarchy: power switch -> load driver -> power management IC -> semiconductor. Compared to high-side switches, low-side switches are simpler to drive (gate referenced to ground), more efficient (no charge pump required), and lower cost - making them the standard choice for resistive and inductive loads whose negative terminal can safely connect to chassis ground, which is typical in automotive 12V systems.
Key differentiating specifications include 42 V maximum load-dump-rated operating voltage, 0.7 Ω typical on-resistance, integrated thermal shutdown with auto-restart, and automotive AEC-Q100 qualification. The PG-SOT223-4 package exposes the drain tab for direct PCB heatsinking, achieving a low thermal resistance suitable for continuous 350 mA operation. An internal clamp handles inductive load turn-off, eliminating the need for an external freewheeling diode in most relay and solenoid circuits.
The BTS3205N die combines a vertical N-channel DMOS output stage with CMOS-compatible logic input, allowing direct connection to 3.3 V or 5 V microcontrollers. Internal charge management provides fast turn-on/turn-off transitions, minimizing switching losses. The device operates across -40 °C to +150 °C junction temperature, supporting underhood automotive environments where ambient temperatures regularly exceed 125 °C.
Typical applications include automotive relay replacement (direct driving of lamps, valves, and motors), body control modules, HVAC blower and fan control, central locking actuators, and industrial 24V solenoid drivers. The 42 V rating comfortably handles 12V and 24V automotive buses including load-dump transients per ISO 7637-2.
When designing with the BTS3205NHUSA1, route the tab (drain) to a copper pour large enough to keep junction temperature below 150 °C under worst-case load. The logic input pin requires no external pull-up or driver - connect directly to a GPIO. For inductive loads above 1 mH, verify the internal clamp energy rating against the load's stored energy (½LI²) to prevent avalanche overstress.
This page synthesizes distributor pricing, drop-in alternatives from the Infineon HITFET family, and practical PCB design guidance not found in the manufacturer datasheet - enabling faster component selection for automotive and industrial low-side switching designs.
Alternativas directas para BTS3205NHUSA1 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con BTS3205NHUSA1 (mismo factor de forma y huella) — difiere en Number of Outputs, Operating Temperature Range, Package, Product Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
BTS3207N
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
BTS3030TF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
BTS3028TF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
VN5E010MH
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
BTS3205NHUSA1 Valores máximos y características eléctricas
| Product Type | Single-channel N-channel low-side power switch |
| Technology Family | Classic HITFET (High-Integrated Temperature-protected FET) |
| Maximum Operating Voltage (Vds) | 42 V |
| Typical On-Resistance RDS(on) | 0.7 Ω |
| Continuous Load Current | 350 mA |
| Configuración de salida | Low-side switch, 1:1 |
| Número de salidas | 1 |
| Input Logic Level | CMOS/TTL compatible (3.3 V and 5 V) |
| Integrated Protections | Over-temperature, short-circuit, over-current, over-voltage, ESD |
| Apagado térmico | Yes, with auto-restart |
| Inductive Load Clamp | Internal avalanche clamp |
| Rango de temperatura de funcionamiento | -40 °C to +150 °C (Tj) |
| Encapsulado | PG-SOT223-4 (3 leads + tab), also known as TO-261-4 / TO-261AA |
| Tipo de montaje | Surface Mount |
| Automotive Qualification | AEC-Q100 qualified |
| RoHS Compliance | Compliant |
Configuración de pines de BTS3205NHUSA1
| Pin 1 | IN — Logic input (CMOS/TTL compatible, 3.3V/5V) |
| Pin 2 | GND — Ground / Source |
| Pin 3 | OUT — Drain output to load |
| Pin 4 (Tab) | DRAIN — Drain / Tab - thermal pad, internally connected to OUT |
Aplicaciones típicas
BTS3205NHUSA1 es adecuado para 7 aplicacións: Automotive Relay Replacement, Solenoid and Valve Drivers, Body Control Module (BCM) Outputs, HVAC Blower and Fan Control, Industrial 24V Solenoid and Relay Control, LED Lighting Modules, Central Door Lock Actuators.
Automotive Relay Replacement
The BTS3205NHUSA1 is purpose-built for replacing electromechanical relays in 12V automotive body-control applications such as lamp clusters, horn drivers, and door-lock actuators. With a 42 V maximum Vds that comfortably absorbs ISO 7637-2 load-dump transients and 350 mA continuous current rating, it directly switches typical 12V coil loads without external flyback components. The 0.7 Ω RDS(on) keeps conduction loss below 100 mW per channel, eliminating the need for a heatsink. Integrated thermal shutdown, short-circuit, and over-current protection provide the same fault tolerance as a fuse-protected relay, but with diagnostic feedback capability when paired with a sense-microcontroller.
Recomendado
Solenoid and Valve Drivers
For hydraulic and pneumatic solenoid valves in automotive transmission control and industrial process automation, the BTS3205NHUSA1 provides a compact, protected low-side drive solution. The internal avalanche clamp absorbs inductive kickback when de-energizing a solenoid coil with stored energy up to the datasheet's EAS limit, eliminating the external freewheeling diode. With -40 °C to +150 °C junction temperature range and AEC-Q100 qualification, it tolerates underhood thermal stress and harsh industrial environments. The CMOS-compatible input allows direct connection to a 3.3 V microcontroller GPIO without level shifting.
Recomendado
Body Control Module (BCM) Outputs
Body control modules typically aggregate 20-30 low-side outputs for lighting, mirror adjustment, and accessory control. The BTS3205NHUSA1's PG-SOT223-4 package with exposed drain tab provides excellent thermal performance in the densely packed BCM PCB environment, where adjacent heat sources constrain available copper area. Each channel dissipates up to ~150 mW at full load, allowing 8-10 channels to share a single heatsink-free copper pour. The integrated protection suite (thermal, short-circuit, over-current, ESD) reduces the external component count per channel by 40-60% versus discrete MOSFET solutions.
Recomendado
HVAC Blower and Fan Control
In automotive HVAC systems, the BTS3205NHUSA1 drives the blower motor relay coil and auxiliary fan switches with PWM capability up to several hundred Hz. While not optimized for high-frequency PWM motor speed control directly, it excels at the on/off relay drive function and at low-frequency PWM for fan speed modulation. The 350 mA continuous rating covers the relay coil current with substantial margin, and the integrated protections safeguard against wiring harness shorts to ground - a common fault mode in HVAC subsystems routed near chassis metalwork.
Recomendado
Industrial 24V Solenoid and Relay Control
Beyond automotive, the BTS3205NHUSA1's 42 V Vds rating makes it well-suited for industrial 24V bus systems controlling pneumatic valves, hydraulic actuators, and small motor starters in PLC discrete output modules. With 24V nominal supply and transient excursions to 36V on inductive switching, the device's 42V ceiling provides 16% margin - tight but acceptable for benign industrial environments. The CMOS input allows direct drive from 24V-to-5V opto-isolated PLC outputs, and the integrated thermal shutdown prevents module damage during wiring faults in the field.
Recomendado
LED Lighting Modules
For automotive interior and exterior LED lighting - including daytime running lights, brake light segments, and dashboard backlighting - the BTS3205NHUSA1 provides a protected constant-current sink with simple on/off control. When paired with a series resistor for current setting, it switches 12V LED strings up to 350 mA with diagnostic capability via the thermal flag. The integrated short-circuit protection guards against PCB solder-bridge defects during LED module manufacturing, and the AEC-Q100 qualification satisfies automotive OEM reliability requirements for exterior lighting.
Recomendado
Central Door Lock Actuators
Central locking systems require bidirectional drive of small DC motors, and the BTS3205NHUSA1 can be paired as a low-side half of an H-bridge driver. Two BTS3205NHUSA1 devices sink current from each motor terminal while two high-side switches source the supply, allowing forward and reverse motor rotation with protected switching. The 350 mA continuous rating suits the small actuators in compact vehicles, while the integrated clamp handles the motor's back-EMF at switch-off without external diodes - reducing PCB area in the door module where space is at a premium.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para BTS3205NHUSA1 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | BTS3207N | BTS3030TF | BTS3028TF | VN5E010MH |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | STMicroelectronics |
| Package | PG-SOT223-4 (TO-261-4) | PG-SOT223-4 - same | PG-SOT223-4 - same | PG-SOT223-4 - same | SOT-223 equivalent footprint |
| Maximum Vds | 42 V | 42 V | 42 V | 42 V | 40 V |
| RDS(on) typical | 0.7 Ω | 0.5 Ω | 30 mΩ | 28 mΩ | 10 mΩ |
| Continuous Drain Current | 350 mA | 700 mA | 3 A | 2 A | 60 A (much higher) |
| Technology Family | Classic HITFET (N-channel) | HITFET family | HITFET family | HITFET family | VIPower (ST equivalent family) |
| Integrated Clamp | Yes (avalanche) | Yes | Yes | Yes | Yes |
| Automotive AEC-Q100 | Qualified | Qualified | Qualified | Qualified | Qualified |
| Typical Unit Price (qty 1) | ~$1.14 | ~$1.20 | ~$0.85 | ~$0.90 | ~$0.95 |
Diferenciadores clave
- Lower RDS(on) at higher current rating (frente a BTS3207N)
- Significantly higher current capability (frente a BTS3030TF)
- Mature HITFET family with extensive automotive pedigree (frente a VN5E010MH (STMicroelectronics))
Notas de diseño
Estimated: at the rated 350 mA continuous current and 12V supply switching a relay coil, the BTS3205NHUSA1 dissipates approximately I²R = 0.35² × 0.7 = 86 mW. With PG-SOT223-4 thermal resistance of about 70 °C/W to a 1-square-inch copper pour, junction temperature rises only 6 °C above ambient - well within the 150 °C Tj limit. For designs without copper heatsinking or with higher ambient (underhood automotive), reduce continuous current to 250 mA or add copper area. Always refer to the Infineon datasheet's thermal derating curves for production designs.
The PG-SOT223-4 tab (pin 4) is internally connected to the drain and must be soldered to a copper pad for both thermal dissipation and electrical connection. Route a copper pour at least 100 mm² (about 0.15 sq inch) directly under the tab to keep thermal resistance below the 70 °C/W datasheet value. Place the input bypass capacitor (typically 100 nF) within 5 mm of the IN pin to prevent false triggering from supply transients. The OUT trace should be wide enough to carry the full load current without significant voltage drop - typically 0.5 mm width per 100 mA.
Do not exceed 42 V on the drain terminal - even transient excursions above this rating can permanently damage the avalanche clamp. The internal thermal shutdown activates around 150 °C junction temperature; if the device is repeatedly entering thermal shutdown under normal load conditions, the PCB thermal design is inadequate or the load current exceeds the rated 350 mA continuous. For inductive loads above 1 mH stored energy, verify against the datasheet's single-pulse avalanche energy (EAS) rating to prevent cumulative degradation of the clamp structure over the device lifetime.
The CMOS input has hysteresis of typically 0.5 V around 1.5 V threshold, allowing direct connection to 3.3 V or 5 V microcontroller GPIO without external pull-ups. For long input traces (>50 mm) in noisy automotive environments, add a 10 kΩ pull-down resistor and 1 nF filter capacitor at the IN pin to reject RF interference and prevent false turn-on from coupled transients. The device does not include an internal pull-down on the input, so a floating input could leave the switch in an undefined state during MCU reset.
Información de cumplimiento
AEC-Q100 qualified for automotive applications per Infineon datasheet. RoHS and REACH compliant. Lead-free and halogen-free per Infineon product environmental compliance documentation.
