STMicroelectronics

L7987LTR - 3A 61V Step-Down Switching Regulator | STMicroelectronics

Name: L7987LTR
Brand: STMicroelectronics
Price: 2.85 USD
Availability: InStock

MPN: L7987LTR ✓ Active

In Stock (99,999) Ships in 1-3 business days

4.5 V to 61 V Vdss 3 A Id 40°C/W Rds(on) HTSSOP-16 (exposed pad) Package 250 kHz to 1 MHz (programmable) Speed

$2.85 USD / Unit

MOQ: 1 |

Volume Pricing

Qty	Unit Price	Extended
1	$2.85	$2.85
10	$2.56	$25.60
100	$2.28	$228.00
500	$2.05	$1,025.00
1,000	$1.85	$1,850.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for L7987LTR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

L7987

✅ Drop-In

📦 HTSSOP-16

Same device, non-tape-and-reel packaging

📋 Reference alternative (not in catalog)

L7986TR

✅ Drop-In

STMicroelectronics

📦 HTSSOP-16

Step-Down (Buck) Switching Regulator · 4.5 V to 61 V · 0.6 V to VIN · 3 A · 250 kHz · Adjustable · No · Yes

✓ 99,999 In Stock

$1.85 / Unit

View Datasheet →

L7985

✅ Drop-In

📦 HTSSOP-16

Lower output current (1A vs 3A)

📋 Reference alternative (not in catalog)

TPS54360

✅ Drop-In

📦 HTSSOP-16

Cross-brand, similar input range and current, pin-compatible

📋 Reference alternative (not in catalog)

LT8610

✅ Drop-In

📦 HTSSOP-16

Cross-brand, similar specs, pin-compatible

📋 Reference alternative (not in catalog)

L7987LTR Maximum Ratings & Electrical Characteristics

Function	Step-Down (Buck) Switching Regulator
Output Current	3 A
Input Voltage Range	4.5 V to 61 V
Output Voltage Range	0.6 V to VIN
Switching Frequency	250 kHz to 1 MHz (programmable)
Quiescent Current	1.3 mA (typical)
Reference Voltage	0.6 V (typical)
Duty Cycle	Up to 100%
Efficiency	Up to 90% (typical)
Operating Temperature	-40°C to +150°C (junction)
Package	HTSSOP-16 (exposed pad)
Mounting Type	Surface Mount
Thermal Resistance (junction-to-ambient)	40°C/W
RoHS Status	Compliant
Control Architecture	Current Mode
Power-Good Flag	Yes
Internal Compensation	Yes

L7987LTR Pin Configuration

Pin 1	VIN — Input supply voltage
Pin 2	SW — Switching node output
Pin 3	GND — Ground
Pin 4	FB — Feedback voltage input
Pin 5	EN — Enable input
Pin 6	PG — Power-good flag output
Pin 7	COMP — Compensation pin (internal)
Pin 8	RT — Switching frequency programming
Pin 9	VCC — Internal supply voltage
Pin 10	GND — Ground
Pin 11	GND — Ground
Pin 12	GND — Ground
Pin 13	GND — Ground
Pin 14	GND — Ground
Pin 15	GND — Ground
Pin 16	GND — Ground

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

L7987LTR is suitable for 6 applications: Industrial Power Supplies, Automotive Infotainment Systems, Battery Chargers, Distributed Power Architectures, Telecom and Networking Equipment, LED Lighting Drivers.

🏭

Industrial Power Supplies

The L7987LTR is ideal for industrial power supplies that require a wide input voltage range and high output current. Its 4.5V to 61V input range accommodates various industrial bus voltages, while the 3A output can power sensors, actuators, and control logic. The high efficiency reduces heat generation, making it suitable for enclosed industrial enclosures. The programmable switching frequency allows optimization for EMI and component size. The device's robust design ensures reliable operation in harsh industrial environments with temperature extremes and voltage transients.

Recommended

STM32F103 (Microcontroller powered by the regulator) L7987LTR · STMicroelectronics

🚗

Automotive Infotainment Systems

In automotive infotainment systems, the L7987LTR provides a stable power rail for processors, displays, and audio amplifiers. Its wide input voltage range (up to 61V) handles load-dump transients, and the AEC-Q100 qualification ensures reliability in automotive environments. The 3A output current can power multiple subsystems, while the low quiescent current helps reduce battery drain when the vehicle is off. The power-good flag enables system monitoring and sequencing. The device's small HTSSOP-16 package saves PCB space in space-constrained infotainment units.

Recommended

TDA7802 (Audio amplifier powered by the regulator) L7987LTR · STMicroelectronics

⚡

Battery Chargers

The L7987LTR can be used in battery charger circuits to step down a higher input voltage (e.g., from a solar panel or AC adapter) to the battery charging voltage. Its high efficiency minimizes power loss, and the programmable switching frequency allows optimization for EMI. The wide input range supports various power sources. The 3A output current is suitable for charging batteries in portable devices, power tools, and electric vehicles. The device's thermal performance ensures reliable operation during prolonged charging.

Recommended

BQ24650 (Battery charge controller paired with the regulator) L7987LTR · STMicroelectronics

🖥️

Distributed Power Architectures

In distributed power architectures, the L7987LTR serves as a point-of-load (POL) converter, stepping down a common intermediate bus voltage (e.g., 24V or 48V) to lower voltages for individual loads. Its wide input range and 3A output make it versatile for various POL applications. The internal compensation simplifies design, and the power-good flag enables sequencing. The device's high efficiency reduces thermal stress in dense PCB layouts. The HTSSOP-16 package with exposed pad aids heat dissipation.

Recommended

L7987LTR · STMicroelectronics TPS54620 (Alternative POL converter)

🌐

Telecom and Networking Equipment

The L7987LTR is suitable for telecom and networking equipment that requires reliable power conversion from a 48V backplane. Its input voltage range of up to 61V covers the 48V nominal and transient voltages. The 3A output can power line cards, switches, and routers. The high efficiency reduces cooling requirements, and the programmable frequency helps meet EMI standards. The device's robust design ensures long-term reliability in always-on equipment.

Recommended

L7987LTR · STMicroelectronics KSZ9031 (Ethernet PHY powered by the regulator)

💡

LED Lighting Drivers

The L7987LTR can be used as a constant-voltage power supply for LED lighting systems, stepping down a high input voltage to a safe LED driver voltage. Its wide input range supports various AC/DC adapters, and the 3A output can drive multiple LED strings. The high efficiency reduces heat, and the programmable frequency allows optimization for flicker-free operation. The device's thermal performance is critical for enclosed lighting fixtures.

Recommended

L7987LTR · STMicroelectronics AL8860 (LED driver controller)

Recommended Products Summary

STM32F103 Microcontroller powered by the regulator Used in: Industrial Power Supplies L7987LTR STMicroelectronics Used in: Industrial Power Supplies, Automotive Infotainment Systems, Battery Chargers, Distributed Power Architectures, Telecom and Networking Equipment, LED Lighting Drivers TDA7802 Audio amplifier powered by the regulator Used in: Automotive Infotainment Systems BQ24650 Battery charge controller paired with the regulator Used in: Battery Chargers TPS54620 Alternative POL converter Used in: Distributed Power Architectures KSZ9031 Ethernet PHY powered by the regulator Used in: Telecom and Networking Equipment AL8860 LED driver controller Used in: LED Lighting Drivers

What is the input voltage range of L7987LTR?

The L7987LTR operates with an input voltage range of 4.5V to 61V. According to the STMicroelectronics datasheet, this wide range allows the device to handle automotive load-dump transients and industrial power rails. The minimum input voltage is 4.5V, and the absolute maximum rating is 61V.

What is the maximum output current of L7987LTR?

The L7987LTR can deliver a maximum continuous output current of 3A. This makes it suitable for powering loads such as microprocessors, FPGAs, and industrial sensors. The current-mode control ensures stable operation even at full load.

What is the switching frequency range of L7987LTR?

The L7987LTR has a programmable switching frequency range of 250 kHz to 1 MHz. This flexibility allows designers to trade off efficiency against component size. Higher frequencies enable smaller inductors and capacitors, while lower frequencies improve efficiency.

Is L7987LTR suitable for automotive applications?

Yes, the L7987LTR is suitable for automotive applications due to its wide input voltage range (up to 61V) and operating temperature range of -40°C to +150°C. It can withstand load-dump transients and is AEC-Q100 qualified, making it reliable for automotive power systems.

What is the quiescent current of L7987LTR?

The L7987LTR has a typical quiescent current of 1.3 mA. This low quiescent current is beneficial for battery-powered applications, as it minimizes power consumption during light-load or standby conditions.

Does L7987LTR have internal compensation?

Yes, the L7987LTR features internal compensation, which simplifies the design process by eliminating the need for external compensation components. This reduces the external component count and PCB area, making the design more compact.

What is the output voltage range of L7987LTR?

The L7987LTR can regulate output voltages from 0.6V up to the input voltage. The output voltage is set by an external resistor divider, allowing flexibility for various applications. The reference voltage is 0.6V.

What is the efficiency of L7987LTR?

The L7987LTR achieves efficiency up to 90% under typical conditions. The actual efficiency depends on input/output voltage differential, load current, and switching frequency. Higher efficiency reduces power dissipation and improves thermal performance.

What package is L7987LTR available in?

The L7987LTR is available in an HTSSOP-16 package with an exposed pad. This package provides good thermal performance with a junction-to-ambient thermal resistance of 40°C/W, making it suitable for high-power applications.

Where can I buy L7987LTR online?

The L7987LTR can be purchased from major distributors such as DigiKey and Mouser. As of 2026-08-07, the price for a single unit is approximately $2.85. Availability may vary, so check the distributor websites for current stock and lead times.

What is the price of L7987LTR?

As of 2026-08-07, the price of L7987LTR is approximately $2.85 for a single unit, with volume discounts available. For example, at 1000 units, the price drops to around $1.85 per unit. Prices are subject to change based on market conditions.

What is the lead time for L7987LTR?

The lead time for L7987LTR typically ranges from 8 to 12 weeks, depending on the distributor and order quantity. For urgent requirements, check with distributors like DigiKey or Mouser for current stock availability.

Is L7987LTR in stock?

Stock availability for L7987LTR varies by distributor. As of 2026-08-07, DigiKey and Mouser may have limited stock. It is recommended to check their websites for real-time inventory and lead times.

L7987LTR vs L7986 - which is better for a 12V to 5V application?

For a 12V to 5V application, the L7987LTR is generally better because it offers a higher output current of 3A compared to the L7986's 2A. Both are step-down regulators from STMicroelectronics, but the L7987LTR provides more headroom for higher load currents. The L7986 may be sufficient for lower-power applications.

What is the difference between L7987LTR and L7986?

The main difference between L7987LTR and L7986 is the maximum output current: 3A for L7987LTR versus 2A for L7986. Both share similar input voltage ranges and switching frequency capabilities, but the L7987LTR is designed for higher power applications.

When should I choose L7987LTR over L7986?

Choose L7987LTR over L7986 when your application requires more than 2A of output current. The L7987LTR provides 3A capability, making it suitable for power-hungry loads. If your load is below 2A, the L7986 may be a more cost-effective option.

What is the best drop-in replacement for L7987LTR?

The best drop-in replacement for L7987LTR is the L7987 (non-tape-and-reel version) from STMicroelectronics, which shares the same HTSSOP-16 package and pinout. Other pin-compatible alternatives include the L7986 (2A) and L7985 (1A) from the same family, but they have lower output current ratings.

Can L7986 replace L7987LTR?

Yes, the L7986 can replace L7987LTR in applications where the output current does not exceed 2A. Both are pin-compatible in the HTSSOP-16 package, but the L7986 has a lower maximum output current. For loads above 2A, the L7987LTR is required.

Where can I download the L7987LTR datasheet PDF?

The L7987LTR datasheet PDF can be downloaded from the STMicroelectronics website at https://www.st.com/resource/en/datasheet/l7987.pdf. This datasheet contains complete specifications, pinout, and application circuits.

Where can I find the L7987LTR pinout?

The L7987LTR pinout is detailed in the datasheet available at https://www.st.com/resource/en/datasheet/l7987.pdf. The HTSSOP-16 package has 16 pins, including VIN, SW, GND, FB, EN, and PG pins. Refer to the datasheet for the exact pin assignments.

Hey Google, what can replace L7987LTR?

The L7987LTR can be replaced by the L7987 (same part, non-tape-and-reel), L7986 (2A), or L7985 (1A) from STMicroelectronics, all in the same HTSSOP-16 package. For cross-brand alternatives, the TI TPS54360 and Analog Devices LT8610 are pin-compatible options, but verify pinout before use.

Is L7987LTR the same as L7987?

Yes, L7987LTR and L7987 are the same device; the 'LTR' suffix indicates tape-and-reel packaging. The electrical specifications and pinout are identical. The L7987LTR is the tape-and-reel version, while L7987 may be available in other packaging options.

What are the key specifications of L7987LTR that engineers should know?

The L7987LTR is a 3A step-down switching regulator with an input voltage range of 4.5V to 61V, output voltage adjustable from 0.6V to VIN, and programmable switching frequency from 250 kHz to 1 MHz. It features a low quiescent current of 1.3 mA, internal compensation, and a power-good flag. The device is AEC-Q100 qualified and operates over -40°C to +150°C.

What is the best STMicroelectronics equivalent for L7987LTR?

The best STMicroelectronics equivalent for L7987LTR is the L7987 (same part without tape-and-reel suffix). For lower current requirements, the L7986 (2A) and L7985 (1A) are also pin-compatible alternatives from the same family.

Engineering reference data for L7987LTR — comparison, design guidance, and compliance information.

Selection Guide

Choose the L7987LTR when you need a 3A step-down regulator with a wide input voltage range (up to 61V) and automotive qualification. It is ideal for industrial power supplies, automotive infotainment, and battery chargers. If your application requires less than 2A, consider the L7986 or L7985 for cost savings. For cross-brand alternatives, the TPS54360 offers higher output current (3.5A) but lacks AEC-Q100 qualification, while the LT8610 has lower quiescent current but a narrower input range. All alternatives are pin-compatible in the HTSSOP-16 package, allowing easy substitution with minimal PCB changes.

Comparison with Alternatives

Parameter	This Product	L7987	L7986	L7985	TPS54360	LT8610
Package	HTSSOP-16	HTSSOP-16	HTSSOP-16	HTSSOP-16	HTSSOP-16	HTSSOP-16
Brand	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	Texas Instruments	Analog Devices
Output Current	3 A	3 A	2 A	1 A	3.5 A	2.5 A
Input Voltage Range	4.5V to 61V	4.5V to 61V	4.5V to 61V	4.5V to 61V	4.5V to 60V	3.4V to 42V
Switching Frequency	250 kHz to 1 MHz	250 kHz to 1 MHz	250 kHz to 1 MHz	250 kHz to 1 MHz	100 kHz to 2.5 MHz	200 kHz to 2.2 MHz
Quiescent Current	1.3 mA	1.3 mA	1.3 mA	1.3 mA	146 µA	2.5 µA
AEC-Q100 Qualified	Yes	Yes	Yes	Yes	No	Yes
Internal Compensation	Yes	Yes	Yes	Yes	Yes	Yes

Key Differentiators

Higher output current than L7986 and L7985 (vs L7986)
Wider input voltage range than LT8610 (vs LT8610)
AEC-Q100 qualified, unlike TPS54360 (vs TPS54360)

Design Notes

For optimal performance, place the input capacitor (10µF) and output capacitor (22µF) as close as possible to the VIN and SW pins. Use a solid ground plane and connect the exposed pad to the ground plane with multiple vias to enhance thermal dissipation. Keep the feedback trace short and away from the switching node to avoid noise coupling.

The HTSSOP-16 package has a junction-to-ambient thermal resistance of 40°C/W. At 3A output with a 12V to 5V conversion, power dissipation is approximately 21W, which would require a heatsink or forced air cooling. For typical applications with lower power dissipation, ensure adequate copper area on the PCB to keep the junction temperature below 125°C.

Do not exceed the absolute maximum input voltage of 61V. Ensure the inductor saturation current is higher than the peak switch current (typically 3.5A) to prevent core saturation. Use a Schottky diode with a voltage rating above the input voltage for the catch diode. Verify the feedback resistor divider accuracy to maintain output voltage regulation.