TPS26400PWPR - 42V 2A eFuse w/ Reverse Polarity | Texas Instruments
MPN： TPS26400PWPR ✓ 啟用中TPS26400PWPR 概覽
An eFuse (electronic fuse) is a solid-state circuit-protection device that replaces a traditional glass-cartridge fuse or PTC with an integrated MOSFET-based switch. It detects overcurrent, overvoltage, short-circuit, and reverse-polarity faults in microseconds, then either latches off or auto-retries depending on configuration. Within the broader system hierarchy, eFuses sit between discrete protection components (TVS diodes, PTC) and supervisor ICs in the power-management block, providing fast, resettable protection for downstream rails loads.
Key features of the TPS26400PWPR include an integrated back-to-back FET topology for true reverse-input blocking down to -42 V, an adjustable current-limit threshold set by an external resistor (RILIM), programmable inrush current slew rate via SS pin, and a fault output (FLT) for system telemetry. The device operates over the -40 °C to +125 °C industrial temperature range and offers an IMON current-monitor output for accurate load-current measurement.
The TPS26400PWPR uses TI's proprietary hot-swap controller architecture with charge-pump gate drive, enabling a typical Rds(on) of approximately 30 mΩ in the pass FET path. Internal comparators monitor VIN, VOUT, and current-sense voltages with programmable response timing, while the FAULT pin supports latch-off or auto-retry modes. Reverse-polarity protection is achieved without additional series diodes loss, preserving efficiency in 24-V industrial bus applications.
Typical applications include 24-V industrial PLC I/O protection, factory-automation sensor and actuator rails, motor-drive auxiliary supplies, building-automation backplane power, and PoE/PoDL powered-device input protection. The wide 4.5 V to 42 V input range also covers 12-V and 36-V automotive and telecom nominal buses.
When designing with this device, derate the HTSSOP-EP package carefully at high VIN and full 2-A load - at VIN = 24 V and VOUT = 12 V, the IC dissipates roughly 24 W under fault conditions and requires substantial copper pour to keep junction temperature in spec.
This page synthesizes distributor pricing, drop-in alternatives (TPS26600PWPR, TPS2HB50AQPWPRQ1, etc.), and practical design notes not found in the TI datasheet alone.
直接替換替代品，適用於 TPS26400PWPR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
TPS26600PWPR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS26400PWP
✅ 直接替換📋 參考替代品（不在目錄中）
TPS26600PWP
✅ 直接替換📋 參考替代品（不在目錄中）
TPS2HB50AQPWPRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
TPS26400PWPR 規格
| Product Type | Industrial eFuse / Hot-Swap Controller |
| Input Voltage Range (operating) | 4.5 V to 42 V |
| Reverse Input Polarity Rating | -42 V (down to) |
| Maximum Continuous Load Current | 2 A |
| Maximum Output Current (datasheet peak) | 2.2 A |
| Nominal Bus Voltage | 24 V |
| Pass Element | Integrated N-channel MOSFET (back-to-back) |
| Current-Limit Programmability | Adjustable via external RILIM resistor |
| Inrush Slew-Rate Control | Programmable via SS pin capacitor |
| Fault Output | FLT pin (active-low, latch/auto-retry) |
| Current Monitor Output | IMON pin (analog) |
| 工作溫度範圍 | -40 °C to +125 °C |
| 封裝 | HTSSOP-16 (PWP) with exposed thermal pad |
| Package Outline | 5.00 mm × 4.40 mm, 0.65 mm pitch |
| Terminal Pitch | 0.65 mm |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
TPS26400PWPR 腳位配置
| 腳位 1 | VIN — Input supply voltage (4.5 V to 42 V) |
| 腳位 2 | VIN — Input supply voltage (second pin for high-current) |
| 腳位 3 | EN/UVLO — Enable and undervoltage lockout |
| 腳位 4 | SS — Soft-start / slew-rate programming capacitor |
| 腳位 5 | ILIM — Current-limit programming resistor |
| 腳位 6 | IMON — Current-monitor analog output |
| 腳位 7 | FLT — Fault indicator output (active-low) |
| 腳位 8 | GND — Ground |
| 腳位 9 | NC — Not connected (per datasheet) |
| 腳位 10 | VOUT — Output to load |
| 腳位 11 | VOUT — Output to load (second pin) |
| 腳位 12 | NC — Not connected (per datasheet) |
| 腳位 13 | NC — Not connected (per datasheet) |
| 腳位 14 | NC — Not connected (per datasheet) |
| 腳位 15 | NC — Not connected (per datasheet) |
| 腳位 16 | NC — Not connected (per datasheet) |
典型應用
TPS26400PWPR 適用於 6 應用s: 24-V Industrial PLC I/O Protection, Factory Automation Sensor and Actuator Rails, Building Automation Backplane Power, Motor-Drive Auxiliary Supply Protection, Powered Device (PoE/PoDL) Input Protection, Automotive 12-V/24-V Auxiliary Load Protection.
24-V Industrial PLC I/O Protection
The TPS26400PWPR protects 24-V PLC digital-output modules and field-sensor rails with true reverse-polarity blocking to -42 V. The integrated back-to-back N-FET pass element eliminates the 300-500 mV drop of a series Schottky diode used in legacy designs, improving efficiency at 2-A continuous load. Programmable inrush slew rate (via SS pin) prevents input rail collapse when multiple PLC outputs switch simultaneously into capacitive loads.
推薦
Factory Automation Sensor and Actuator Rails
Use the TPS26400PWPR between a 24-V industrial bus and downstream proximity sensors, solenoid drivers, and pneumatic actuators. The adjustable current limit (via RILIM) lets designers dial in per-channel trip points matched to actuator inrush, while the IMON analog output feeds a system ADC for predictive-maintenance telemetry. The wide 4.5-42 V input range covers both 24-V nominal and the 36-V telecom supply rails found in mixed industrial sites.
推薦
Building Automation Backplane Power
Building-automation controllers (HVAC, lighting, access control) require robust 24-V backplane protection against field-side miswiring. The TPS26400PWPR's reverse-polarity protection survives accidental -24 V hookup during installation - a common field-failure mode. The FLT pin drives a system supervisor to log the fault event and the IMON output provides per-rail load-current trending for energy-management dashboards.
推薦
Motor-Drive Auxiliary Supply Protection
Industrial AC and servo motor drives use a 24-V logic rail to power gate drivers, encoders, and isolation circuits. The TPS26400PWPR protects this auxiliary rail from cross-wiring faults when drives are serviced in the field. Integrated reverse-blocking to -42 V eliminates the need for an external P-FET reverse-protection circuit, saving PCB area and BOM cost in compact IPM-based drive designs.
推薦
Powered Device (PoE/PoDL) Input Protection
While the TPS26400PWPR is not a PoE PD controller, it serves as the post-PoE 24-V or 48-V rail protector, blocking reverse polarity if a non-powered cable is accidentally connected. The 42-V operating range covers the upper end of PoE Type-3/4 voltage rails after the PD controller's hot-swap FET. Programmable inrush control prevents bulk-capacitor charging transients from tripping upstream PoE current-limit thresholds.
推薦
Automotive 12-V/24-V Auxiliary Load Protection
For non-AEC-Q100 automotive applications (commercial vehicles, recreational, agriculture), the TPS26400PWPR provides 12-V/24-V load-dump protection up to 42 V and survives jump-start transients. The IMON output feeds the body-control module for per-fuse load-current logging. For AEC-Q100-qualified builds, select the pin-compatible TPS26600PWPR automotive variant with identical electrical characteristics.
推薦
推薦產品摘要
工程參考資料，適用於 TPS26400PWPR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TPS26600PWPR | TPS26400PWP | TPS26600PWP | TPS2HB50AQPWPRQ1 |
|---|---|---|---|---|---|
| Package | HTSSOP-16 (PWP) | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same | HTSSOP-16 (PWP) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 42 V | 4.5 V to 50 V (wider) |
| Output Current (continuous) | 2 A | 2 A | 2 A | 2 A | 2.5 A (per channel, dual) |
| Reverse Polarity Protection | -42 V integrated | -42 V integrated | -42 V integrated | -42 V integrated | -42 V integrated |
| AEC-Q100 Qualification | No (industrial) | Yes (automotive) | No (industrial) | Yes (automotive) | Yes (automotive) |
| Channels | 1 single-channel eFuse | 1 single-channel eFuse | 1 single-channel eFuse | 1 single-channel eFuse | 2 dual-channel eFuses |
| IMON Current Monitor | Yes (analog) | Yes (analog) | Yes (analog) | Yes (analog) | Yes (analog) |
主要差異化特點
- Integrated reverse-input polarity protection without series-diode loss (對比Discrete Schottky + P-FET reverse-protection circuits)
- True 2-A continuous rating in HTSSOP-16 (PWP) footprint with IMON telemetry (對比TPS25200 family (legacy TI eFuse, smaller current))
- Pin-compatible automotive upgrade path (對比TPS26600PWPR (automotive variant))
設計說明
At VIN = 24 V and full 2-A load into a short circuit, the TPS26400PWPR can dissipate up to ~48 W during the fault-clearing interval. The HTSSOP-16 (PWP) exposed thermal pad must be soldered to at least 1 square inch of continuous copper pour on top and inner PCB layers. Estimated: with 1 oz copper on a 4-layer board and adequate thermal vias (9-16 vias under the EP), theta_JA drops to roughly 35 °C/W, limiting junction temperature rise to ~50 °C at sustained 2-A load. Without the EP properly soldered, expect thermal shutdown under sustained fault conditions.
Place input bulk capacitance (≥1 µF X7R ceramic plus 47-100 µF aluminum/poly) as close to the VIN pins as possible to handle the inrush transient. Place the VOUT bypass (≥10 µF X7R) within 5 mm of the VOUT pins to suppress load-step ringing. Keep the ILIM resistor trace short and direct to the GND pin - long traces add parasitic resistance that shifts the programmed current limit. The SS pin capacitor (typically 10-100 nF) should be returned to GND with a short, low-inductance path.
Do not exceed the -42 V reverse-polarity absolute maximum - although the integrated back-to-back FETs block reverse current, sustained overvoltage beyond -42 V can damage the gate oxide. Always confirm the upstream TVS clamp voltage plus any transient overshoot stays within the 42-V forward / -42 V reverse window. Also note that in Active ORing configurations, the un-powered TPS26400 will measure approximately 0.7 V on FLT/IMON pins with respect to GND - the system MCU should ignore these readings on the inactive device per the TI datasheet application note.
合規資訊
RoHS and REACH compliant per distributor listings. Not AEC-Q100 qualified; choose TPS26600PWPR for automotive. Halogen-free status not explicitly listed in verified web data.
