BTS70121EPAXUMA1 - 8.5A Smart High-Side Power Switch | Infineon
MPN: BTS70121EPAXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.95 | $1.95 |
| 10 | $1.76 | $17.60 |
| 100 | $1.55 | $155.00 |
| 500 | $1.38 | $690.00 |
| 1,000 | $1.2 | $1,200.00 |
| 2,500 | $1.05 | $2,625.00 |
BTS70121EPAXUMA1 Overview
A high-side power switch (also called a smart power switch or PROFET - Protected FET) is a semiconductor device that sits between an upstream supply (typically a vehicle battery) and a downstream load. By placing the switch on the high side, current flows from the supply through the switch to the load, allowing the switch to control, protect, and diagnose the load. PROFET devices are a sub-category of power distribution switches within PMIC (Power Management IC) products, and they are widely used in automotive body and powertrain ECUs.
Key features of the BTS70121EPAXUMA1 include an 8.5 A continuous load current capability, integrated protective functions (overload, short-circuit, over-temperature, over-voltage, reverse battery), and current-limit / ground-loss diagnostics. According to Infineon's PROFET+2 family documentation, the part is qualified to AEC-Q100 for automotive applications, ships in tape-and-reel packaging, and offers two-wire or direct-switch interface options depending on the variant in the family. The exposed pad on the PG-TSDSO-14 package provides a low-thermal-resistance path, helping dissipate the heat generated when the device drives high-current loads.
Typical applications include automotive body electronics (lighting modules, seat heaters, mirror controls), powertrain auxiliary drivers, and industrial 24 V systems that benefit from a robust, self-protected high-side driver. Because the switch handles inrush currents, short circuits, and ground-loss events autonomously, the host microcontroller does not need to implement complex fault-recovery firmware.
When designing with this part, place input bulk capacitance close to the Vbb pin to absorb load-dump transients and follow Infineon's PCB layout recommendations for the PG-TSDSO-14 thermal pad to keep junction temperature within the AEC-Q100 envelope. The lowest 8 mOhm per channel rating in this family makes it well suited for high-current loads where conduction losses dominate system efficiency.
This page synthesizes distributor pricing, drop-in alternatives from the same PROFET+2 family, and practical design notes that are not found in the manufacturer datasheet alone.
Drop-in alternatives for BTS70121EPAXUMA1 β 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 BTS70121EPAXUMA1 (same form factor and footprint) β differing in Package, Diagnostic Output, Protection Features, Product Type, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BTS70202EPAXUMA1
β Drop-Inβ In Stock
$1.62 / Unit
View Datasheet βBTS700201ESPXUMA2
β Drop-Inβ In Stock
$2.18 / Unit
View Datasheet βBTS72002EPAXUMA1
β Drop-Inβ In Stock
$1.28 / Unit
View Datasheet βBTS4142NHUMA1
β Drop-Inβ In Stock
$0.97 / Unit
View Datasheet βBSP762TXUMA1
β Drop-Inβ In Stock
$0.74 / Unit
View Datasheet βBTS70121EPAXUMA1 Maximum Ratings & Electrical Characteristics
| Manufacturer | Infineon Technologies |
| Product Family | PROFET+2 (Protected FET) |
| Product Type | Smart High-Side Power Switch |
| Number of Channels | 1 |
| Output Configuration | High-Side |
| Switch Type | N-Channel (2x8 mOhm integrated) |
| Maximum Output Current | 8.5 A |
| On-State Resistance (RDS(on)) | 2 x 8 mOhm (typical) |
| Package | PG-TSDSO-14-22 (14-pin, exposed pad) |
| Pin Pitch | 0.65 mm |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 |
| Operating Temperature Range | -40C to +150C (junction, AEC-Q100) |
| Load Dump Protection | Yes (integrated) |
| Reverse Battery Protection | Yes (compatible with harshest requirements per family datasheet) |
| Diagnostics | Current sense / status output |
| Protections | Overload, short-circuit, over-temperature, over-voltage |
| Packaging | Tape & Reel |
| MSL Level | MSL2 or MSL3 (per JEDEC J-STD-020) |
| RoHS Compliance | Compliant |
BTS70121EPAXUMA1 pg-tsdso-14-22 (14-pin, exposed pad) Pin Configuration Guide
Pin configuration for BTS70121EPAXUMA1 (pg-tsdso-14-22 (14-pin, exposed pad) package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for BTS70121EPAXUMA1.
Refer to the datasheet for full pin configuration.
Typical Applications
BTS70121EPAXUMA1 is suitable for 6 applications: Automotive Lighting Module Driver, Seat Heater Power Switch, Body Control Module Auxiliary Output, Industrial 24V Solenoid Driver, Power Window and Sunroof Driver, Rear Window Defroster Grid Driver.
Automotive Lighting Module Driver
The BTS70121EPAXUMA1's 8.5 A continuous load current and 2x8 mOhm RDS(on) make it ideal for driving high-power automotive lighting loads such as HID headlamps, LED matrix modules, and front fog lamps. The part's AEC-Q100 qualification, integrated reverse-battery protection, and load-dump immunity allow direct connection to the 12 V vehicle bus without external TVS protection. Compared to a discrete N-MOSFET plus sense resistor, the integrated solution reduces PCB area by 50-70% in the headlamp ECU and provides built-in current-sense diagnostics for bulb-out detection. The PG-TSDSO-14-22 exposed pad ensures junction temperature stays within the AEC-Q100 envelope even at full 8.5 A continuous load.
Recommended
Seat Heater Power Switch
The BTS70121EPAXUMA1 is well suited as the high-side driver for heated-seat modules in automotive body controllers. Its 8.5 A continuous rating covers the inrush current of resistive heating elements, while the integrated over-temperature shutdown protects against blocked-vent scenarios. The PG-TSDSO-14-22 footprint keeps the driver footprint compact, allowing placement near the seat connector. The exposed thermal pad couples directly to the body ECU ground pour, keeping Tj below 150C even at maximum PWM duty. Compared to electromechanical relays, the PROFET+2 solution eliminates mechanical wear and provides PWM-capable current profiling for temperature regulation.
Recommended
Body Control Module Auxiliary Output
Body Control Modules (BCMs) drive dozens of loads including mirrors, door locks, and accessory relays. The BTS70121EPAXUMA1's single-channel 8.5 A rating fits higher-current auxiliary outputs that exceed what a quad-channel PROFET can handle, while still maintaining the same fault-diagnostics interface. According to Infineon's PROFET+2 datasheet, the integrated reverse-battery protection supports the harshest requirement on the market, eliminating the need for external reverse-polarity diodes. The 0.65 mm pitch PG-TSDSO-14-22 package enables dense BCM PCB layouts and the AEC-Q100 grade ensures reliability across the -40C to +150C automotive temperature range.
Recommended
Industrial 24V Solenoid Driver
Beyond automotive, the BTS70121EPAXUMA1 serves as a robust high-side switch for 24V industrial solenoid and valve drivers in factory automation. The 8.5 A continuous rating handles typical DC solenoid inrush, while the integrated short-circuit protection prevents catastrophic failure if a solenoid winding shorts. The exposed thermal pad couples to a copper pour on the industrial PLC PCB, maintaining safe junction temperature at high ambient. Compared to electromechanical relays, the PROFET+2 solution offers faster switching, PWM capability for soft-start, and longer lifetime - critical for high-cycle industrial applications. AEC-Q100 over-temperature profile is also well suited to industrial cabinet environments up to +85C ambient.
Recommended
Power Window and Sunroof Driver
The BTS70121EPAXUMA1 provides the high-current half-bridge high-side path needed for power window and sunroof motor control modules. The 8.5 A rating covers stall current of typical window regulators, and the integrated overload shutdown protects the motor windings from sustained stall events. The reverse-battery protection per PROFET+2 family eliminates external diodes, reducing BOM cost. The PG-TSDSO-14-22 exposed pad provides excellent thermal dissipation for repetitive motor-start cycles. When paired with a complementary low-side switch, the BTS70121EPAXUMA1 enables H-bridge topologies for bi-directional window control with full AEC-Q100 diagnostics.
Recommended
Rear Window Defroster Grid Driver
The BTS70121EPAXUMA1's 8.5 A continuous rating and 2x8 mOhm RDS(on) make it an excellent driver for rear-window defroster grids, which draw sustained 6-8 A current. The lowest RDS(on) in the PROFET+2 family minimizes conduction losses, keeping the driver cool during long defrost cycles. The integrated over-temperature protection and AEC-Q100 qualification provide automotive-grade reliability for this always-on-when-activated load. The exposed thermal pad of the PG-TSDSO-14-22 package can be soldered to a copper pour on the rear-hatch ECU PCB to spread heat efficiently. Compared to mechanical relays, the solid-state PROFET+2 solution enables PWM-based defrost intensity control for fuel-efficient operation.
Recommended
Recommended Products Summary
Engineering reference data for BTS70121EPAXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BTS70202EPAXUMA1 | BTS700201ESPXUMA2 | BTS72002EPAXUMA1 | BTS4142NHUMA1 |
|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | PG-TSDSO-14-22 | PG-TSDSO-14-22 | TSDSO-14-22 (ESP) | PG-TSDSO-14-22 | PG-TSDSO-14 |
| Number of Channels | 1 | 1 | 1 | 1 | 1 |
| Switch Type | N-Channel High-Side | N-Channel High-Side | N-Channel High-Side | N-Channel High-Side | N-Channel High-Side |
| Automotive Qualification | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 | AEC-Q100 |
Key Differentiators
- Lowest on-state resistance in PROFET+2 family (vs BTS70202EPAXUMA1)
- 8.5 A continuous current rating (vs BTS700201ESPXUMA2)
- Harshest reverse-battery protection (vs BTS4142NHUMA1)
Design Notes
Estimated: At 8.5 A continuous load through a 2x8 mOhm RDS(on) output, the steady-state conduction loss is approximately P = I^2 * R = 8.5^2 * 0.008 = 0.578 W per channel, well within the PG-TSDSO-14-22 thermal envelope. However, during inrush events (cold lamp filaments, motor stall), peak current can reach 25-30 A and junction temperature must be checked against the 150C AEC-Q100 limit. Use a copper pour of at least 1 square inch on the exposed pad to keep thermal resistance low.
Place the input bulk capacitor (>=10 uF, low-ESR ceramic) as close as possible to the Vbb pin to absorb load-dump transients and to provide a stable high-frequency supply for the gate driver. The exposed thermal pad of the PG-TSDSO-14-22 package MUST be soldered to a top-layer copper pour with thermal vias to the inner/inner ground plane, per Infineon's PG-TSDSO package application note. Keep the high-current output trace short and wide to minimize parasitic inductance that can cause ringing during switching.
Do not exceed the maximum junction temperature of 150C. Ensure that the chosen load does not produce sustained inrush currents above the device's current-limit threshold, which can trigger repeated thermal shutdown cycles. The reverse-battery protection is integrated, but external TVS protection is still recommended on the Vbb pin for load-dump transients above 40 V. Always reference the latest Infineon PROFET+2 family datasheet for the specific current-limit and over-temperature thresholds of the BTS7012-1EPA variant.
Compliance Information
AEC-Q100 qualified for automotive applications per distributor listings (DigiKey, Arrow, Mouser). RoHS and REACH compliant per Infineon product page. Halogen-free per modern Infineon PROFET family datasheets.
