TLD21421EPXUMA1 - 180mA Linear LED Driver AEC-Q100 | Infineon
MPN: TLD21421EPXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.31 | $131.00 |
| 500 | $1.08 | $540.00 |
| 1,000 | $0.92 | $920.00 |
| 2,500 | $0.78 | $1,950.00 |
TLD21421EPXUMA1 Overview
A linear LED driver is a type of constant-current source that regulates LED brightness by dissipating excess input voltage as heat across an internal pass element, as opposed to a switching driver that stores energy in an inductor. Linear drivers are simpler, EMI-quiet, and free of inductive ringing, making them ideal for safety-relevant automotive lighting and small-form-factor lamp modules where the VIN-VLED differential is modest.
Key features of the TLD21421EPXUMA1 include 180 mA programmable output current via an external sense resistor, integrated reverse-polarity protection, load-dump robustness up to 40 V on the supply pin, overtemperature shutdown with auto-recovery, and a single-channel topology that drives one LED string. The exposed thermal pad of the PG-TSDSO-14 package enables efficient heat removal, which is critical for linear drivers that absorb the full input-to-LED voltage difference. The device also provides a status/diagnostic output for fault feedback to the ECU.
The TLD21421EPXUMA1 uses a current-control loop referenced to an internal bandgap, with a sense resistor on a dedicated pin setting the regulated output current. Output current accuracy is typically within +/-3% across temperature, ensuring uniform brightness between LED modules. The integrated protection block includes open-LED detection, short-to-ground detection, and thermal derating, all critical for ISO 26262 functional-safety analysis in body and lighting ECUs.
Typical applications include automotive tail-light and brake-light clusters, turn signals, daytime running lights (DRL), interior ambient lighting, and two-wheeler rear lamps. The 5.5 V to 40 V input range covers 12 V and 24 V vehicle buses directly, eliminating the need for a pre-regulator. The PWM dimming input allows flicker-free brightness control for both headlamp leveling and animated indicator functions.
When designing with this device, calculate power dissipation as (VIN - VLED) x ILED and confirm that the exposed pad receives adequate copper area to keep junction temperature below 150 C. The 14-pin TSSOP exposed-pad footprint also requires that the PCB land pattern uses thermally enhanced vias under the e-pad to conduct heat into inner copper planes.
This page synthesizes distributor pricing, AEC-Q100 qualification details, drop-in compatible LITIX family variants, and practical PCB thermal design notes not consolidated on any single distributor or manufacturer page.
Drop-in alternatives for TLD21421EPXUMA1 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 TLD21421EPXUMA1 (same form factor and footprint) β differing in Operating Temperature Range, Package, Topology, Dimming Method, Number of Outputs.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLD2141-3EP
β Drop-Inπ Reference alternative (not in catalog)
TLD2331-3EP
β Drop-Inπ Reference alternative (not in catalog)
TLD1114-1EP
β Drop-Inπ Reference alternative (not in catalog)
TLD21421EPXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Linear Constant-Current LED Driver |
| Number of Outputs | 1 |
| Output Current (max) | 180 mA |
| Supply Voltage Range | 5.5 V to 40 V |
| Maximum Output Voltage | 40 V |
| Dimming Method | PWM (external) |
| Operating Temperature Range | -40 C to +150 C |
| Package | PG-TSDSO-14 (TSSOP-14-EP, 150 mil) |
| Mounting Type | Surface Mount |
| AEC-Q100 Qualification | Qualified |
| Product Family | LITIX Basic+ |
| Diagnostic Output | Yes (fault flag) |
| Thermal Protection | Overtemperature shutdown with auto-recovery |
| Reverse Polarity Protection | Yes (integrated) |
| Load Dump Robustness | Yes (up to 40 V on VS) |
| MSL Level | 3 |
| RoHS Status | Compliant |
TLD21421EPXUMA1 Pin Configuration
| Pin 1 | VS β Supply voltage (5.5 V to 40 V) |
| Pin 2 | GND β Ground |
| Pin 3 | OUT β LED string current output |
| Pin 4 | ISENSE β External sense resistor to set LED current |
| Pin 5 | PWMDIM β PWM dimming input |
| Pin 6 | DIAG β Diagnostic fault output (open drain) |
| Pin 7 | ST β Status / enable input |
| Pin 8 | IN β Logic input reference |
| Pin 9 | NC β Not connected (per datasheet) |
| Pin 10 | NC β Not connected (per datasheet) |
| Pin 11 | NC β Not connected (per datasheet) |
| Pin 12 | NC β Not connected (per datasheet) |
| Pin 13 | NC β Not connected (per datasheet) |
| Pin 14 | NC β Not connected (per datasheet) |
Typical Applications
TLD21421EPXUMA1 is suitable for 6 applications: Automotive Tail-Light and Brake-Light Clusters, Daytime Running Lights (DRL), Turn Signal and Indicator Lamps, Automotive Interior Ambient Lighting, Two-Wheeler and Powersport Rear Lamps, Status and Indicator LED Panels.
Automotive Tail-Light and Brake-Light Clusters
The TLD21421EPXUMA1 directly drives a single LED string for automotive rear-lighting clusters, with 180 mA output matching typical high-brightness LED requirements. Its 5.5 V to 40 V input range covers 12 V and 24 V vehicle buses without a pre-regulator, and AEC-Q100 qualification allows deployment in safety-relevant exterior lamps. The linear topology eliminates inductor switching noise, simplifying EMC compliance for CISPR 25 Class 5 lamp modules.
Recommended
Daytime Running Lights (DRL)
For DRL strings that demand precise constant current and high reliability, the TLD21421EPXUMA1 provides 180 mA with +/-3% accuracy across temperature, ensuring uniform brightness across the lamp module. The exposed-pad TSSOP-14 package dissipates the VIN-VLED differential efficiently, and the PWM dimming input enables DRL/position-light switching without flicker. AEC-Q100 grade 1 supports under-hood mounting conditions.
Recommended
Turn Signal and Indicator Lamps
The TLD21421EPXUMA1's PWM dimming capability makes it well-suited for animated or sequential turn signal indicators, where PWM duty-cycle control produces smooth fade-in/out transitions. The integrated diagnostic output provides fault feedback to the body-control module, supporting turn-signal failure detection required by ECE R48 and FMVSS 108 regulations. The 40 V load-dump tolerance absorbs 12 V jump-start and transient events.
Recommended
Automotive Interior Ambient Lighting
Interior ambient strips require compact linear drivers with low EMI. The TLD21421EPXUMA1 in TSSOP-14-EP is small enough for in-door-trim PCBAs and produces no switching ripple that could couple into audio or RF circuits nearby. PWM dimming allows smooth brightness sweeps for mood lighting, and AEC-Q100 qualification ensures reliability across cabin temperature extremes of -40 C to +85 C ambient.
Recommended
Two-Wheeler and Powersport Rear Lamps
Motorcycles, scooters, and ATVs use 12 V electrical systems with compact lamp housings. The TLD21421EPXUMA1's small TSSOP-14-EP footprint and linear topology suit vibration-prone environments where inductors can fail, while AEC-Q100 grade 1 temperature range tolerates engine-bay heat. 180 mA drives high-brightness LED replacements for legacy incandescent bulbs without re-engineering the wiring harness.
Recommended
Status and Indicator LED Panels
Industrial control panels and HMI backlights use constant-current LED drivers for uniform indicator brightness. The TLD21421EPXUMA1 provides 180 mA with PWM dimming for adjustable backlight intensity, and its diagnostic output flags open-LED faults for predictive maintenance. The TSSOP-14-EP exposed pad enables high-density PCB layouts in space-constrained panel designs.
Recommended
Recommended Products Summary
Engineering reference data for TLD21421EPXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD2141-3EP | TLD2331-3EP | TLD1114-1EP |
|---|---|---|---|---|
| Package | PG-TSDSO-14 (TSSOP-14-EP) | PG-TSDSO-14 (TSSOP-14-EP) | PG-TSDSO-14 (TSSOP-14-EP) | PG-TSDSO-14 (TSSOP-14-EP) |
| Brand | Infineon | Infineon | Infineon | Infineon |
| Number of Channels | 1 | 3 | 3 | 1 |
| Supply Voltage Range | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V |
| AEC-Q100 Qualification | Yes | Yes | Yes | Yes |
| Topology | Linear constant-current | Linear constant-current | Linear constant-current | Linear constant-current |
| PWM Dimming | Yes (external PWMDIM) | Yes (external) | Yes (external) | Yes (external) |
| Product Family | LITIX Basic+ | LITIX Basic+ | LITIX Basic+ | LITIX Basic+ |
Key Differentiators
- Single-channel 180 mA in compact TSSOP-14-EP (vs TLD2331-3EP)
- LITIX Basic+ family integration with diagnostic output (vs Discrete transistor LED driver)
- PWM dimming without external MOSFET (vs TLD1114-1EP)
Design Notes
Estimated: at VIN = 13.5 V (running vehicle), VLED = 8 V (3x white LEDs), and ILED = 180 mA, the TLD21421EPXUMA1 dissipates approximately (13.5 - 8) x 0.18 = 0.99 W. With the TSSOP-14-EP exposed pad soldered to at least 1 cm^2 of 1 oz copper on a 4-layer board, theta_JA is approximately 35 C/W, giving a 35 C junction rise above ambient. For higher VIN or larger VLED stacks, expand the copper area under the e-pad and use thermal vias to inner planes to keep Tj below 150 C.
Route the ISENSE trace as a Kelvin connection directly to the sense resistor pads to avoid ground-loop errors that affect output current accuracy. Place input and output capacitors within 3 mm of the VS and OUT pins to minimize parasitic inductance. The exposed thermal pad MUST be soldered to a copper land pattern with thermal vias (typically 9-12 vias, 0.3 mm drill) to comply with Infineon's recommended land pattern and achieve rated thermal performance.
Do not exceed 40 V on the VS pin even briefly - load-dump pulses above 40 V require an external TVS clamp (e.g., SMBJ33A) at the supply input. Ensure the PWMDIM pin is not left floating; tie to VS through a pull-up or to GND when not used, otherwise the driver may enter an undefined state. Verify that the sense resistor is rated for the expected power dissipation and that its tolerance is 1% or better to maintain +/-3% LED current accuracy.
The TLD21421EPXUMA1 is a linear driver and inherently EMI-quiet, but high dv/dt on the PWMDIM pin can still couple into nearby RF circuits. Place the IC away from AM/FM antenna traces and add a small RC filter (10 kohm + 100 pF) on PWMDIM if the dimming signal originates from a long harness. For 12 V/24 V bus inputs, add a 100 nF X7R bypass cap directly at the VS pin to suppress conducted emissions above 30 MHz.
Compliance Information
AEC-Q100 qualified for automotive applications per Infineon datasheet. RoHS and lead-free confirmed via JLCPCB and distributor listings. Halogen-free status not explicitly stated in available web data - verify with manufacturer.
