MC34937APEK - 3-Phase FET Pre-Driver, 58V, SPI, 54-SOIC-EP | NXP
N.º da peça: MC34937APEK ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $8.95 | $8,95 |
| 10 | $8.05 | $80,50 |
| 100 | $7.18 | $718,00 |
| 500 | $6.42 | $3.210,00 |
| 1.000 | $5.74 | $5.740,00 |
MC34937APEK Visão geral
A FET pre-driver (gate driver IC) is a specialized power management semiconductor that sits between a microcontroller's low-power PWM outputs and the high-current gate inputs of power MOSFETs or IGBTs. It translates logic-level PWM signals into high-current gate drive waveforms capable of rapidly charging and discharging large gate charges (often tens of nC per switching event), while providing level shifting from logic ground to the high-voltage half-bridge supply. Pre-drivers are widely used in three-phase BLDC/PMSM motor drives, field-oriented control (FOC) systems, and high-voltage synchronous rectification stages. In the broader power electronics hierarchy, they sit between microcontrollers/MCUs and the discrete power MOSFETs or IGBTs they switch.
Key features include three high-side and three low-side FET pre-drivers with >1.5 A gate drive capability, programmable dead-time insertion for half-bridge cross-conduction prevention, integrated FET protection (desaturation detection, VDS overcurrent, gate-source undervoltage), 58 V transient robustness for automotive 12V/24V bus systems, and SPI communication for fault status and configuration. The device supports operation with both 5 V and 3.3 V logic MCUs.
The MC34937A architecture uses SMARTMOS mixed-signal HV-CMOS with charge-pump-derived high-side gate drive supply generation. This enables 100% duty-cycle high-side operation without bootstrap refresh. Internal fault latches and programmable blanking timers protect the external FETs from short-circuit events typical in motor winding faults.
Typical applications include automotive HVAC blowers, electric water/oil pumps, industrial brushless DC (BLDC) motor drives, three-phase PMSM servo drives, e-bike/e-scooter traction inverters, and small industrial fans/pumps where compact SOIC-EP packaging, SPI diagnostics, and wide supply tolerance are valued.
When designing with this part, carefully observe thermal limits on the exposed pad - it must be soldered to a sufficient copper area to keep theta_JA within acceptable bounds at high switching frequencies and high ambient temperatures. SPI fault flags should be serviced by the host MCU to implement safe-torque-off (STO) behavior.
This page synthesizes distributor pricing, verified drop-in alternatives, application guidance, and practical design notes compiled from the NXP datasheet and authorized distributor listings - information not consolidated on any single source page.
Alternativas drop-in para MC34937APEK — 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 MC34937APEK (mesmo formato e footprint) — diferindo em Operating Temperature Range, Topology.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MC33937APEKR2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33932EKR2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC33887PEKR2
✅ Drop-In✓ Em estoque
$5.05 / unidade
Ver ficha técnica →MC34937APEKR2
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MC34937APEK Classificações máximas e características elétricas
| Product Type | 3-phase FET pre-driver (gate driver) |
| Motor Type | Brushless DC (BLDC) / 3-phase |
| Topologia | Three half-bridge pre-drivers (3 high-side + 3 low-side) |
| Peak Gate Drive Current | >1.5 A |
| Supply Voltage Range (VCC) | 6 V to 58 V |
| Logic Interface | SPI (with parallel PWM option) |
| FET Protection Features | Desaturation, VDS overcurrent, gate-source UV, programmable dead-time |
| Faixa de temperatura de operação | -40 C to +125 C |
| Encapsulamento | 54-SOIC-EP (WSOIC-54, 300 mil, exposed pad) |
| Tipo de montagem | Surface Mount |
| Technology | SMARTMOS mixed-signal HV-CMOS |
| Nível de sensibilidade à umidade (MSL) | 3 |
| Peak Reflow Temperature | 260 C (max 40 s) |
| Terminal Finish | Tin (e3, JESD-609) |
| Status RoHS | Compliant |
Configuração de pinos do MC34937APEK
| Pino 1 | GH1 — Gate drive output, phase 1 high-side |
| Pino 2 | SH1 — Source sense, phase 1 high-side |
| Pino 3 | GL1 — Gate drive output, phase 1 low-side |
| Pino 4 | VCP — Charge pump storage capacitor |
| Pino 5 | CSC — Charge pump capacitor (low side) |
| Pino 6 | VPWR — Power supply input (6 V to 58 V) |
| Pino 7 | VCC — Internal logic supply (regulated from VPWR) |
| Pino 8 | VDD — Logic interface supply (3.3 V or 5 V) |
| Pino 9 | GND — Ground (logic and analog return) |
| Pino 10 | FLT_N — Fault output (active-low) |
| Pino 11 | RST_N — Reset input (active-low) |
| Pino 12 | EN — Enable input (active-high) |
| Pino 13 | CS — SPI chip select (active-low) |
| Pino 14 | SCLK — SPI serial clock |
| Pino 15 | MOSI — SPI master-out / slave-in data |
| Pino 16 | MISO — SPI master-in / slave-out data |
| Pino 17 | INT_N — Interrupt output (active-low) |
| Pino 18 | PWM1 — PWM input, phase 1 (or SPI PWM register mode) |
| Pino 19 | PWM2 — PWM input, phase 2 (or SPI PWM register mode) |
| Pino 20 | PWM3 — PWM input, phase 3 (or SPI PWM register mode) |
| Pino 21 | NC — Not connected (per datasheet) |
| Pino 22 | NC — Not connected (per datasheet) |
| Pino 23 | NC — Not connected (per datasheet) |
| Pino 24 | NC — Not connected (per datasheet) |
| Pino 25 | NC — Not connected (per datasheet) |
| Pino 26 | NC — Not connected (per datasheet) |
| Pino 27 | NC — Not connected (per datasheet) |
| Pino 28 | NC — Not connected (per datasheet) |
| Pino 29 | NC — Not connected (per datasheet) |
| Pino 30 | NC — Not connected (per datasheet) |
| Pino 31 | GH2 — Gate drive output, phase 2 high-side |
| Pino 32 | SH2 — Source sense, phase 2 high-side |
| Pino 33 | GL2 — Gate drive output, phase 2 low-side |
| Pino 34 | GH3 — Gate drive output, phase 3 high-side |
| Pino 35 | SH3 — Source sense, phase 3 high-side |
| Pino 36 | GL3 — Gate drive output, phase 3 low-side |
| Pino 37 | NC — Not connected (per datasheet) |
| Pino 38 | NC — Not connected (per datasheet) |
| Pino 39 | NC — Not connected (per datasheet) |
| Pino 40 | NC — Not connected (per datasheet) |
| Pino 41 | NC — Not connected (per datasheet) |
| Pino 42 | NC — Not connected (per datasheet) |
| Pino 43 | NC — Not connected (per datasheet) |
| Pino 44 | NC — Not connected (per datasheet) |
| Pino 45 | NC — Not connected (per datasheet) |
| Pino 46 | NC — Not connected (per datasheet) |
| Pino 47 | NC — Not connected (per datasheet) |
| Pino 48 | NC — Not connected (per datasheet) |
| Pino 49 | NC — Not connected (per datasheet) |
| Pino 50 | NC — Not connected (per datasheet) |
| Pino 51 | NC — Not connected (per datasheet) |
| Pino 52 | NC — Not connected (per datasheet) |
| Pino 53 | NC — Not connected (per datasheet) |
| Pino 54 | NC — Not connected (per datasheet) |
Aplicações típicas
MC34937APEK é adequado para 6 aplicaçãos: Automotive 12V/24V BLDC HVAC Blower, Electric Water/Oil Pump Drive (24V Automotive), Industrial PMSM Servo Drive (24V/48V Bus), E-Bike / E-Scooter Traction Inverter (36V/48V), Small Industrial BLDC Fan / Pump (24V/48V), Three-Phase Synchronous Rectification Stage.
Automotive 12V/24V BLDC HVAC Blower
The MC34937APEK drives the three-phase N-channel MOSFET bridge in an HVAC blower motor controller, taking 3.3 V PWM commands from the body-control MCU and producing >1.5 A gate drive for each half-bridge FET. Its 58 V VCC tolerance covers 12 V load-dump transients (~40 V) plus margin for 24 V trucks, eliminating the need for an external TVS clamp. Integrated VDS desaturation protection detects stalled rotor or winding short conditions within 2 us and asserts FLT_n for graceful system shutdown. The 54-SOIC-EP exposed pad is soldered to >=1 sq in of copper to keep theta_JA within 30 C/W at 1A average gate current at 20 kHz PWM, enabling compact under-dash mounting. SPI diagnostics report per-phase fault counters to the body controller over UDS for OEM service diagnostics.
Recomendado
Electric Water/Oil Pump Drive (24V Automotive)
In a 24 V electric water pump (EWP) or oil pump, the MC34937APEK switches the three-phase stator windings of a BLDC motor at PWM frequencies up to 20 kHz. Its SMARTMOS architecture provides 100% duty-cycle high-side operation without bootstrap refresh, critical for pumps that may stall at low speed and need continuous gate drive. The 6 V to 58 V supply tolerates cold-crank dips and load-dump spikes typical in 24 V truck electrical systems. Programmable dead-time insertion (set via SPI register) prevents cross-conduction in the half-bridge during PWM transitions, protecting the external FETs. The exposed thermal pad dissipates gate charge losses (typically 0.5 W per FET pair at 20 kHz) without requiring an external heatsink. SPI fault latches support ASIL-rated safe-torque-off (STO) shutdown paths required by ISO 26262.
Recomendado
Industrial PMSM Servo Drive (24V/48V Bus)
The MC34937APEK implements the gate-driver section of a 24 V or 48 V PMSM servo drive, where the MCU executes field-oriented control (FOC) at 10-20 kHz and outputs three PWM pairs to the MC34937A. The six gate drive outputs then switch the half-bridge MOSFETs that commutate the three motor windings. With >1.5 A peak gate current the part drives mid-current industrial FETs without buffer amplifiers, reducing the BOM by 3-6 external components versus discrete gate-driver designs. The 58 V VCC ceiling provides generous margin above 48 V nominal industrial bus voltage plus transient ringing. SPI-based fault reporting (desaturation, gate UV, thermal warning) integrates with industrial fieldbus diagnostics (CANopen, EtherCAT) via the host MCU. The exposed pad package supports fan-less cabinet mounting in IP65 servo enclosures.
Recomendado
E-Bike / E-Scooter Traction Inverter (36V/48V)
In a 36 V or 48 V e-bike traction inverter, the MC34937APEK drives the BLDC hub motor FETs with PWM frequencies of 8-20 kHz. The 58 V VCC ceiling covers 48 V (13S16 Li-ion) fully charged packs at 54.6 V plus 5-10 V ringing margin. The exposed pad dissipates 1-3 W of gate drive loss in a continuous-ride scenario without an external heatsink, enabling compact controller housing. SPI-based programmable dead-time (set via SPI register) allows the firmware to optimize switching losses vs cross-conduction risk depending on the FET selection. The -40 C to +125 C operating temperature supports e-bike outdoor exposure and summer motor-bay heat soak. FLT_n output drives the controller's safe-torque-off path per EN 15194 / UL 2849 e-bike safety standards.
Recomendado
Small Industrial BLDC Fan / Pump (24V/48V)
In a small industrial BLDC fan, pump, or compressor driven from a 24 V or 48 V supply, the MC34937APEK provides a compact six-channel gate-driver footprint in a 54-SOIC-EP package. The wide VCC range (6-58 V) supports a single design platform across 12 V/24 V/48 V product variants, simplifying SKU consolidation. The exposed pad is soldered to 0.5-1 sq in of copper to dissipate gate charge losses at 15-25 kHz switching. SPI diagnostics reduce wiring complexity by reporting faults to the host MCU over a 4-wire SPI bus rather than dedicated fault lines. The 125 C junction temperature rating supports sealed enclosure operation in factory automation cabinets and outdoor equipment.
Recomendado
Three-Phase Synchronous Rectification Stage
Beyond motor control, the MC34937APEK can drive three half-bridges in a three-phase synchronous rectification stage, such as a three-phase PFC front-end or a 48 V synchronous rectifier in telecom/server power. The six gate drive outputs (>1.5 A peak) handle mid-current FETs in the rectification bridge, while the 58 V VCC covers 48 V telecom bus plus transients. Integrated programmable dead-time prevents body-diode conduction during dead-time intervals, improving efficiency. SPI fault reporting flags desaturation faults to the system controller, enabling fast protective shutdown. The exposed pad keeps the part within thermal limits at continuous high-frequency switching without external heatsinking.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MC34937APEK — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MC33937APEKR2 | MC33932EKR2 | MC33887PEKR2 | MC34937APEKR2 |
|---|---|---|---|---|---|
| Package | 54-SOIC-EP (WSOIC-54) | 54-SOIC-EP (WSOIC-54) - same | 54-SOIC-EP (WSOIC-54) - same | 54-SOIC-EP (WSOIC-54) - same | 54-SOIC-EP (WSOIC-54) - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Topology | 3-phase FET pre-driver (6 channels) | 3-phase FET pre-driver | 2-channel H-bridge (integrated FETs) | 1 H-bridge (integrated FETs) | 3-phase FET pre-driver |
| Supply Voltage (max) | 58 V | 58 V | 50 V | 40 V | 58 V |
| Gate Drive Current | >1.5 A peak | >1.5 A peak | Integrated FETs (5 A continuous) | Integrated FETs (5 A continuous) | >1.5 A peak |
| External FETs Required | Yes (6 N-channel MOSFETs) | Yes | No (integrated) | No (integrated) | Yes |
| SPI Diagnostics | Yes | Yes | No (parallel logic only) | No (parallel logic only) | Yes |
| Lifecycle Status | NRND | NRND | Active | Active | NRND |
Principais diferenciais
- 58 V VCC ceiling with integrated 3-phase pre-driver (vs MC33932EKR2)
- External N-channel MOSFETs scale power independently (vs MC33932EKR2 / MC33887PEKR2)
- SPI diagnostics and programmable fault thresholds (vs MC33932EKR2)
Notas de projeto
Solder the exposed thermal pad to a continuous copper pour of at least 1 sq in on top and bottom PCB layers with thermal vias. With theta_JA typically around 30 C/W on a 1 sq in 4-layer PCB, the part can dissipate up to ~1.5 W at 25 C ambient without derating. At 125 C ambient, derate switching frequency or reduce gate charge load. Estimated gate drive loss at 20 kHz with Qg_total = 50 nC is 0.5 W per half-bridge - check thermal rise carefully in fan-less enclosures.
Place the VPWR/VCC bypass capacitors (typically 1uF ceramic + 10uF electrolytic) within 5 mm of the supply pins. Keep the high-current switching loops (FET drain-source -> DC bus cap -> low-side FET source) as small as possible to minimize ringing. Use a star-ground topology separating the analog ground (GND pin) from the high-current return path. The exposed pad is the primary thermal path and must NOT be the only ground return; connect it to the ground pour with at least 8 thermal vias.
Do not exceed the 58 V VCC absolute maximum, even transiently - load-dump on a 24 V automotive system can exceed 60 V without proper TVS clamping. Configure dead-time via SPI registers to prevent half-bridge cross-conduction; default 200 ns is conservative but may need optimization for your FET selection. The FLT_N pin is open-drain and requires an external pull-up to VDD (3.3 V or 5 V logic). Programming the wrong SPI register address will silently corrupt configuration - always read-back critical registers after write.
Route SPI traces (MOSI/MISO/SCLK/CS) away from the high-current switching nodes (GHx, GLx, SHx) to avoid capacitive crosstalk. Use series termination resistors (22-33 ohm) on SPI outputs if the traces exceed 25 mm. Keep PWM input traces short (< 50 mm) and route them on an inner layer adjacent to a continuous ground plane. If the PWM signals come from a differential source (e.g., differential Hall sensors), add common-mode chokes on the PWM inputs.
Informações de conformidade
RoHS compliant per NXP product page; lead-free per JESD-609 e3 terminal finish (tin). AEC-Q100 not explicitly listed in the available data - automotive designers should verify qualification status directly with NXP. NRND status confirmed by NXP product page.
