BTS621L1E3128AAUMA1 - 8.5A Smart High-Side Switch 24V | Infineon
MPN: BTS621L1E3128AAUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.62 | $2,620.00 |
BTS621L1E3128AAUMA1 Overview
A smart high-side switch is a type of power distribution switch that sits between the load and the battery rail (typically 12 V or 24 V in automotive/industrial systems), allowing a microcontroller to turn a load on or off with logic-level signals while providing comprehensive load protection and diagnostic feedback. As a member of the broader PROFET (Protected FET) family within automotive power management ICs, this category delivers the energy efficiency of MOSFETs with the integration of analog protection and digital diagnostics - critical for replacing mechanical relays and discrete fuses in modern vehicle electrical architectures.
Key features include 8.5 A continuous per-channel load current, 8 mΩ Rds(on) per channel for low conduction losses, ground-referenced CMOS-compatible logic input, integrated charge pump eliminating the need for external drive circuitry, and proportional load current feedback through the IS pin. The PG-TO263-7-2 (DPAK-style) package offers low thermal resistance (θJA ≈ 40 C/W on 6 cm² PCB copper) and is designed for automated assembly. Operating voltage spans 5 V to 34 V, with load-dump survival to 42 V.
This device is optimized for 24 V systems including commercial trucks, agricultural tractors, construction equipment, and 24 V battery industrial applications. The diagnostic feedback pin enables current sensing without a shunt resistor, simplifying ECU design and supporting ASIL-relevant fault detection strategies. The part carries automotive qualification and is built on Infineon's AEC-Q100-grade Smart SIPMOS process for harsh-environment reliability.
Typical applications include resistive loads (heaters, lamps), inductive loads (valves, solenoids, small motors), and LED lighting modules. The wide operating range and rugged protection features make it equally suitable for body electronics modules, agricultural machinery ECUs, and industrial 24 V DC distributed systems. Designers should size PCB copper area to handle thermal dissipation at maximum load and follow Infineon's reference layout for the PG-TO263-7-2 footprint to achieve the rated Rth values.
When designing with this device, ensure the load current does not exceed the thermal derating curve for the actual PCB copper area. The IS pin current-mirror output must be connected to an ADC input with a properly scaled ground-referenced resistor - misuse is a common design pitfall.
Drop-in alternatives for BTS621L1E3128AAUMA1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with BTS621L1E3128AAUMA1 (same form factor and footprint) — differing in Package, Protection Features, Technology, Product Type, Diagnostic Output.
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View Datasheet →BTS621L1E3128AAUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Smart High-Side Power Switch (PROFET) |
| Number of Channels | 2 |
| Rds(on) per Channel (typ) | 8 mΩ |
| Continuous Load Current per Channel | 8.5 A |
| Operating Voltage Range | 5 V to 34 V |
| Load Dump Protection | Up to 42 V |
| Input Logic Level | CMOS-compatible, ground-referenced |
| Diagnostic Feedback | Current-mirror IS pin (proportional load current sense) |
| On-State Resistance | 8 mΩ typical |
| Package | PG-TO263-7-2 (DPAK-style, 7 leads + tab) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +150 C (junction) |
| Technology | Smart SIPMOS (vertical N-channel FET + charge pump + logic) |
| Protection Features | Overload, short-circuit, over-temperature, over-voltage, reverse battery |
| Automotive Qualification | AEC-Q100 (PROFET family) |
| Target Voltage Class | 24 V commercial vehicle systems (trucks, tractors, 24V industrial) |
| Lead-Free / RoHS | Yes (compliant) |
BTS621L1E3128AAUMA1 Pin Configuration
| Pin 1 | OUT1 — Output channel 1 (load connection) |
| Pin 2 | IN — Logic input (CMOS-compatible, ground-referenced) |
| Pin 3 | GND — Ground reference |
| Pin 4 | IS — Current sense / diagnostic feedback output |
| Pin 5 | OUT2 — Output channel 2 (load connection) |
| Pin 6 | VBB — Battery supply voltage |
| Pin 7 | NC — Not connected (per datasheet) |
| Pin TAB | VBB — Tab/thermal pad - internally connected to VBB |
Safe Operating Area (typical, single pulse)
Typical Applications
BTS621L1E3128AAUMA1 is suitable for 6 applications: Commercial Truck Lighting Control, Agricultural Tractor Solenoid and Valve Drivers, Construction Equipment Heater Control, Industrial 24 V DC Distributed Systems, Body Electronics Module Loads, 24 V LED Work Light Modules.
Commercial Truck Lighting Control
The BTS621L1E3128AAUMA1 directly drives 24 V truck headlamps, marker lamps, and work lights with 8.5 A per-channel capacity. Its 34 V operating range and 42 V load-dump survival handle the harsh 24 V truck electrical environment. The integrated diagnostic IS pin enables broken-lamp detection for ASIL-relevant safety functions without shunt resistors.
Recommended
Agricultural Tractor Solenoid and Valve Drivers
24 V solenoid valves, hydraulic control valves, and PTO engagement coils in tractors draw heavy inrush currents that the BTS621L1E3128AAUMA1's 8.5 A continuous rating handles reliably. Built-in short-circuit and over-temperature protection prevents field failures from inductive kickback and wiring faults. AEC-Q100 qualification supports the agricultural machinery EMC and environmental requirements.
Recommended
Construction Equipment Heater Control
Cab heaters, mirror heaters, and seat heaters in 24 V construction equipment benefit from the BTS621L1E3128AAUMA1's 8.5 A capability and ground-referenced CMOS input. The dual-channel configuration enables two independent heater zones with one IC, reducing PCB area. Reverse-battery protection prevents ECU damage from jumper-cable miswiring in service trucks.
Recommended
Industrial 24 V DC Distributed Systems
Factory automation 24 V DC outputs drive sensors, indicators, and small actuators through the BTS621L1E3128AAUMA1. The IS pin current-mirror output feeds a microcontroller ADC for load monitoring and predictive maintenance. Wide 5 V to 34 V tolerance tolerates industrial DC bus variations during motor start-up events.
Recommended
Body Electronics Module Loads
Body control modules for trucks and tractors use the BTS621L1E3128AAUMA1 for central door locking, mirror adjustment motors, and interior lighting. AEC-Q100 grade and Smart SIPMOS reliability reduce warranty claims. The CMOS-compatible input drives directly from 3.3 V or 5 V microcontroller GPIO without level shifters.
Recommended
24 V LED Work Light Modules
High-power LED work lights for off-highway machinery need constant-current drivers with PWM dimming support. The BTS621L1E3128AAUMA1's IS feedback and ground-referenced input enable closed-loop current control with a simple op-amp. 8.5 A continuous rating handles 100 W+ LED arrays at 24 V nominal supply.
Recommended
Recommended Products Summary
Engineering reference data for BTS621L1E3128AAUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS621L1E3128ABUMA1 | ITS4200SSJDXUMA1 | BTS70202EPAXUMA1 | BTS5215LAUMA1 | BTS723GWXUMA1 |
|---|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-TO263-7-2 | PG-TO263-7-2 - same | PG-TO263-7-2 - same | PG-TO263-7-2 - same | PG-TO263-7-2 - same | PG-TO263-7-2 - same |
| Rds(on) per Channel | 8 mΩ | 8 mΩ | 200 mΩ (single ch) | 70 mΩ | 250 mΩ | 110 mΩ |
| Continuous Current per Channel | 8.5 A | 8.5 A | 1.0 A | 2.5 A | 1.5 A | 1.4 A |
| Operating Voltage Range | 5 V to 34 V | 5 V to 34 V | 5 V to 28 V | 5 V to 28 V | 5 V to 28 V | 5 V to 28 V |
| Number of Channels | 2 | 2 | 1 | 2 | 2 | 2 |
| Diagnostic Feedback | Yes (IS pin current mirror) | Yes | Yes | Yes (SPI) | Yes | Yes |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes |
| Voltage Class | 24 V optimized | 24 V optimized | 12 V | 12 V | 12 V | 12 V |
Key Differentiators
- Higher continuous current per channel than 12 V PROFET competitors (vs BTS70202EPAXUMA1)
- Lower Rds(on) reduces conduction losses by 3x vs ITS4200 family (vs ITS4200SSJDXUMA1)
- 24 V native optimization vs 12 V retrofit (vs BTS5215LAUMA1)
Design Notes
Estimated: At 24 V supply, 8.5 A continuous per channel, and 8 mΩ Rds(on) per channel, each channel dissipates P = I² × R = 8.5² × 0.008 = 0.578 W. Both channels active total dissipation is ~1.16 W. On 6 cm² PCB copper, theta_JA of ~40 C/W gives 46 C rise above 25 C ambient, so junction reaches ~71 C - well within 150 C rating. On minimal copper (1 cm²), theta_JA can exceed 100 C/W, requiring derating to ~5 A per channel.
Follow Infineon's PG-TO263-7-2 reference layout with the tab soldered to a copper pour of at least 6 cm² on top and bottom layers for rated thermal performance. Use thermal vias (12+ 0.3 mm vias) under the tab to inner copper planes. Keep high-current OUT traces wide (>2 mm per ampere) and short to minimize voltage drop and EMI. The IS sense resistor should be Kelvin-connected to the GND pin to avoid ground bounce errors.
Do not connect the IS pin directly to a microcontroller ADC without a current-limiting resistor and protection Zener - fault conditions can drive IS above the MCU's absolute maximum. Reverse-battery protection is built in but does NOT protect against negative transients below -24 V; add an external TVS for severe load-dump reverse polarity events. The input pin is ground-referenced CMOS - do NOT drive it from a logic supply that can exceed 7 V absolute maximum.
Compliance Information
AEC-Q100 qualified per Infineon Classic PROFET 12V family datasheet. RoHS and REACH compliant per product page. Lead-free and halogen-free construction.
