TLD1211SJFUMA1 - 85mA Linear LED Driver, 28V max | Infineon
MPN: TLD1211SJFUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.75 | $0.75 |
| 10 | $0.66 | $6.60 |
| 100 | $0.56 | $56.00 |
| 500 | $0.45 | $225.00 |
| 1,000 | $0.38 | $380.00 |
| 2,500 | $0.33 | $825.00 |
TLD1211SJFUMA1 Overview
A linear LED driver is a regulator topology that places a power device in series with the LED string, dropping excess supply voltage as heat while precisely regulating the current flowing through the LED load. Unlike switching LED drivers, linear drivers introduce no EMI and no switching ripple, simplifying PCB layout for noise-sensitive environments such as rear combination lamps and interior ambient lighting.
Key features include a wide supply operating range of 5.5 V to 28 V (load-dump tolerant to 40 V), an external sense resistor that programs output current from a few mA up to 85 mA, integrated PWM dimming via the EN pin (accepting CMOS/TTL levels), and protection circuitry against over-temperature, over-current, and reverse polarity conditions typical of automotive 12V/24V bus systems.
The TLD1211SJ uses a bipolar transistor process combined with a precision bandgap reference to set the sense voltage across the external resistor. Its low headroom requirement (typical Vsense around 0.5 V to 1.3 V at low current) minimizes wasted power while keeping the LED current tightly regulated across temperature and supply variations.
Typical applications include automotive tail/brake lighting, turn indicators, daytime running lights (DRL), and interior LED strings where PWM dimming is required. The single-channel architecture suits single-LED or short-string loads where high efficiency is unnecessary but EMI-free operation and small PCB footprint matter.
When designing with this part, ensure the PCB dissipates the (VIN - VLED) x IOUT heat via copper pour. Use a 1 percent or better external sense resistor (typically 13 ohm for 65 mA) for stable current matching across the automotive temperature range.
This page synthesizes distributor pricing, drop-in alternatives, and practical automotive design notes not found in the Infineon datasheet alone, helping engineers select and validate the TLD1211SJFUMA1 against modern automotive LED lighting requirements.
Drop-in alternatives for TLD1211SJFUMA1 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 TLD1211SJFUMA1 (same form factor and footprint) β differing in Package, Topology, Dimming Method, Operating Temperature Range, Output Current per Channel.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TLD1125ELXUMA1
β Drop-Inβ In Stock
$0.85 / Unit
View Datasheet βTLD21313EPXUMA1
β Drop-Inβ In Stock
$0.98 / Unit
View Datasheet βTLD1211SJFUMA1 Maximum Ratings & Electrical Characteristics
| Product Type | Linear LED Driver IC |
| Number of Outputs | 1 |
| Topology | Linear Constant-Current |
| Maximum Output Current | 85 mA |
| Supply Voltage Range (Vs) | 5.5 V to 28 V |
| Load-Dump Tolerance | 40 V |
| Dimming Interface | PWM via EN pin (CMOS/TTL) |
| EN High-Level Voltage (V_EN,ON) | 1 V to 5.5 V |
| EN Low-Level Voltage (V_EN,OFF) | -0.3 V to 0.3 V |
| EN Input Current (I_EN) | 60 to 130 uA (V_EN = 5 V) |
| Sense Voltage (Vsense) | Programmed by external resistor |
| Drop Voltage (Vs - Vout) | 1.3 V typical (Iout < 15 mA, Vsense = 0 mV, Vs = 8 V) |
| Operating Temperature Range | -40 C to +150 C (junction) |
| Package | PG-DSO-8-16 (8-pin, exposed pad) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 targeted (Automotive Grade) |
| RoHS Status | Compliant |
TLD1211SJFUMA1 Pin Configuration
| Pin 1 | NC β Not connected (per datasheet) |
| Pin 2 | Vs β Supply voltage input (5.5 V to 28 V) |
| Pin 3 | Vsense β Sense input - connect external sense resistor to GND |
| Pin 4 | GND β IC ground, connect with pin 2 area on PCB for thermal dissipation |
| Pin 5 | NC β Not connected (per datasheet) |
| Pin 6 | EN β Enable / PWM dimming input (CMOS/TTL levels, 1 V to 5.5 V = on) |
| Pin 7 | OUT β LED current output (up to 85 mA, constant-current regulated) |
| Pin 8 | NC β Not connected (per datasheet); exposed pad on package bottom serves as thermal pad to GND |
Typical Applications
TLD1211SJFUMA1 is suitable for 6 applications: Automotive Tail and Brake Lighting, Daytime Running Light (DRL) LED String, Turn Indicator / Blinker LED, Automotive Interior Ambient Lighting, Automotive Side Marker and Position Lamps, Status Indicator LED in Automotive Clusters.
Automotive Tail and Brake Lighting
The TLD1211SJFUMA1 fits single-string automotive tail and brake lighting with its 85 mA linear current source and 5.5 V to 28 V supply tolerance. The wide input range covers load-dump transients up to 40 V and cold-crank dips down to 5.5 V on the 12 V automotive bus without flicker. Placed between the 12 V battery rail and a series LED string, it dissipates (VIN - VLED) x IOUT as heat; for a 12 V to 9 V drop at 85 mA that is only 255 mW, manageable on a 1 cm2 copper pour. Unlike a switching LED driver, the TLD1211SJ introduces zero EMI - critical for tail-lamp modules that share chassis ground with sensitive CAN bus nodes. The PWM EN input allows direct MCU dimming for stop/tail intensity blending. AEC-Q100 qualification ensures reliability across the -40 C to +150 C automotive temperature range.
Recommended
Daytime Running Light (DRL) LED String
For DRL applications the TLD1211SJFUMA1 provides a single regulated 85 mA channel sized for a 1 W to 2 W LED string (typically 3 to 7 high-brightness LEDs in series). Its 5.5 V to 28 V supply range accepts direct 12 V automotive bus power without pre-regulation, while 40 V load-dump tolerance removes the need for external TVS protection. The linear topology eliminates EMI that would otherwise require shielding near the DRL module. PWM dimming through the EN pin allows daytime/nighttime brightness switching directly from a body-control MCU GPIO. According to the Infineon datasheet Rev. 1.0, the integrated thermal shutdown protects the IC when VIN minus VLED drop rises at high ambient temperatures under the hood.
Recommended
Turn Indicator / Blinker LED
The TLD1211SJFUMA1 suits turn indicator LED driving where a stable, flicker-free current source matters more than efficiency. The constant-current regulation keeps brightness constant over the full 9 V to 16 V automotive battery range, so the turn signal intensity does not visibly vary between engine-off cranking and running conditions. The EN pin accepts the body-control MCU's PWM turn-signal pattern directly; the bipolar driver settles within microseconds, supporting 1 Hz to 10 Hz blink patterns without visible artifacts. Unlike a discrete resistor-based LED driver, the TLD1211SJ compensates for LED forward-voltage shift with temperature, ensuring the indicator remains visible in cold-start and high-ambient conditions. The PG-DSO-8-16 package fits compact turn-indicator lamp housings.
Recommended
Automotive Interior Ambient Lighting
For premium interior ambient lighting strips, the TLD1211SJFUMA1 provides a low-noise linear current source that does not inject switching ripple into the audio or RF circuits located nearby. A typical 12 V to 14 V automotive supply drives a 3 LED string at 60 mA to 85 mA with only 200 mW to 400 mW of IC dissipation - negligible at room temperature. The PWM EN interface supports smooth dimming transitions for mood lighting presets controlled by the body-control MCU. AEC-Q100 qualification and the -40 C to +150 C junction temperature rating ensure reliability behind dashboard modules where ambient temperatures can exceed 85 C in direct sunlight. The PG-DSO-8-16 package with exposed pad allows direct PCB thermal pad connection.
Recommended
Automotive Side Marker and Position Lamps
Side marker and position lamps require a low-current (typically 20 mA to 50 mA per LED), always-on LED driver that survives automotive electrical transients. The TLD1211SJFUMA1, programmed via external sense resistor to a lower current within its 85 mA max, fits this role with minimal wasted power. Its 40 V load-dump tolerance and reverse-polarity robustness eliminate the TVS protection that discrete designs need, reducing BOM cost. The constant-current regulation keeps position lamp brightness uniform across vehicle-to-vehicle battery voltage variations. The single-channel output suits the single-LED or short-string nature of side markers, and the small PG-DSO-8-16 footprint fits the tight lamp-housing geometry of side-marker modules.
Recommended
Status Indicator LED in Automotive Clusters
Behind instrument clusters and HVAC control panels, small status-indicator LEDs (door ajar, low-fuel, child-lock) need a regulated current source that survives the cranking and load-dump transients of the 12 V bus. The TLD1211SJFUMA1, programmed to 10 mA to 20 mA via a larger sense resistor, drops the typical 12 V supply to LED forward voltage with 1.3 V to 2 V of headroom - well within the bipolar driver's safe operating area. The PWM EN pin allows blinking patterns for warning indicators without external transistors. The bipolar process technology provides the ruggedness demanded by automotive electronics, and the small PG-DSO-8-16 package can be placed on the same PCB as the cluster microcontroller.
Recommended
Recommended Products Summary
Engineering reference data for TLD1211SJFUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TLD1125ELXUMA1 | TLD21313EPXUMA1 |
|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-DSO-8-16 | PG-DSO-8 (same family footprint) | PG-DSO-8 (same family footprint) |
| Topology | Linear constant-current | Linear constant-current | Linear constant-current (3-channel) |
| Maximum Output Current | 85 mA (single channel) | up to 120 mA (single channel) | 3 x 85 mA (3 channels) |
| Supply Voltage Range | 5.5 V to 28 V (40 V load dump) | 5.5 V to 28 V (LITIX Linear family) | 5.5 V to 28 V (LITIX Linear family) |
| Number of Output Channels | 1 | 1 | 3 |
| Dimming Interface | PWM via EN pin (CMOS/TTL) | PWM via EN pin (CMOS/TTL) | PWM via EN pin (CMOS/TTL) |
| Automotive Grade | AEC-Q100 | AEC-Q100 | AEC-Q100 |
Key Differentiators
- AEC-Q100 qualified single-channel linear LED driver in compact PG-DSO-8-16 (vs TLD21313EPXUMA1)
- Lower-cost option in LITIX Linear family for sub-100 mA loads (vs TLD1125ELXUMA1)
- Zero EMI / zero switching noise - critical for noise-sensitive automotive lamp modules (vs Switching LED drivers (e.g. buck-boost topologies))
Design Notes
Estimated: At VIN = 12 V, VLED = 9 V, IOUT = 85 mA, the TLD1211SJFUMA1 dissipates approximately 0.255 W (Pdiss = (12-9) * 0.085). The PG-DSO-8-16 exposed pad connects to a copper pour of at least 1 cm2 to keep junction temperature rise below 25 C above ambient. For higher drop voltages (VIN = 14 V, VLED = 3 V, IOUT = 85 mA) dissipation climbs to ~0.94 W and requires 2 cm2 of copper pour or forced airflow. The bipolar process and exposed thermal pad design keeps thermal resistance low but PCB layout is the dominant thermal path.
Connect the exposed pad of the PG-DSO-8-16 package directly to the GND plane with multiple thermal vias for heat spreading. Place the external sense resistor as close as possible to the Vsense pin (pin 3) to minimize parasitic resistance that would shift the regulated current. Use a 1 percent or better sense resistor to maintain 5 percent LED current accuracy across the -40 C to +150 C automotive range. The Infineon datasheet Rev. 1.0 recommends tying pin 4 (GND) to the pin 2 (Vs) copper pour area on the PCB to share thermal dissipation.
Do not exceed the maximum Vs of 28 V (continuous) or 40 V (load-dump transient). For 24 V truck systems, verify load-dump profile compatibility - the TLD1211SJFUMA1 is qualified for 12 V automotive; 24 V systems may require a TVS clamp. Avoid leaving the EN pin floating; it must be tied HIGH for continuous-on operation or driven by a defined logic signal. Reverse polarity on the Vs pin without external protection will damage the IC; add a series diode or P-FET reverse-polarity block per Infineon application note recommendations.
Compliance Information
AEC-Q100 qualified per Infineon automotive LITIX Linear family product page. RoHS compliant per DigiKey product detail listing. Halogen-free status not explicitly stated in verified web data.
