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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

onsemi TN5D51A-HB11-E

Name: TN5D51A-HB11-E
Brand: onsemi
SKU: TN5D51A-HB11-E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TN5D51A-HB11-E

Manufacturer:: onsemi

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: TO-220-5 Full Pack, Formed Leads

Datasheet:: TN5D51A-HB11-E.pdf

Description:: IC REG BUCK 12V 5A TO220F5I5H-HB

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Product details

Overview

TN5D51A-HB11-E from SANYO Semiconductor is a vertically integrated P-channel power MOSFET-based step-down switching regulator IC delivering 12 V output at up to 5 A, featuring 100 mΩ R_DS(on), 120–180 kHz switching frequency, and integrated over-current, under-voltage, and over-temperature protection with self-recovery. It targets industrial DC-DC conversion in 20–48 V input systems.

For engineers reviewing the TN5D51A-HB11-E datasheet, pinout, applications, or equivalent options, key selection criteria include its 12 V fixed-output regulation, soft-start programmability via external capacitor, standby-mode control on SS pin, and TO-220FI5H-HB package thermal performance up to 15 W at T_c = 25°C.

Technical Context

The TN5D51A-HB11-E implements a separately excited buck topology with internal P-ch MOSFET, bandgap reference, error amplifier, PWM comparator, and oscillator. Its feedback loop uses FB pin voltage (target 1.25 V internally referenced) to regulate output via duty-cycle adjustment.

Protection functions operate autonomously: over-current threshold is 5.1–10 A (typ. 7.5 A), UVLO turns off at V_IN ≤ 7.2–8.8 V and recovers at 8.1–9.9 V, and thermal shutdown activates at 165°C (±25°C hysteresis). Soft-start time is externally adjustable via capacitor on SS pin.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	12.0 V ±0.3 V (tight regulation across 0–5 A load and 20–48 V input)
Max Output Current	5 A continuous (limited by thermal design and R_DS(on) = 100 mΩ)
Switching Frequency	150 kHz typ. (120–180 kHz range; determines inductor size and EMI profile)
R_DS(on)	100 mΩ (enables high efficiency ≥92% at 3 A, reduces conduction loss)
UVLO Threshold	8.0 V turn-on / 9.0 V turn-off (1.0 V hysteresis prevents oscillation near dropout)
Thermal Shutdown	165°C activation / 140°C recovery (25°C hysteresis ensures stable reset after cooling)
Efficiency	92% at VIN=30 V, IOUT=3 A (validates suitability for thermally constrained enclosures)

Pinout & Package

Package: TO-220FI5H-HB - 5-pin insulated through-hole package with integral heatsink tab; 16.0 mm × 14.0 mm footprint, 12.5 mm height, and 2.54 mm pin pitch. Mounting requires mechanical isolation and thermal interface to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
1: VIN	Input power supply connection	Accepts 20–48 V DC input; rated to 57 V absolute max; handles high di/dt transients
2: GND	Power and signal ground reference	Common return for input capacitor, output feedback, and internal circuitry; critical for noise immunity
3: SWOUT	Switch node output	Drives external choke and freewheeling diode; connects directly to source of internal P-MOSFET
4: FB	Output voltage feedback input	Monitors regulated output via resistive divider; internal reference is 1.25 V; max 15 V rating
5: SS	Soft-start and standby control	Connect external capacitor for ramp-up timing; pull ≤0.3 V to enter standby (I_stb = 500 μA)

Key Features

Feature	Design Value
Integrated P-ch MOSFET	Eliminates external high-side switch; simplifies layout and reduces BOM count
Self-recovering protections	Over-current, UVLO, and over-temperature faults auto-clear after root cause removal-no manual reset needed
Externally programmable soft start	Capacitor on SS pin sets output voltage ramp time-prevents inrush current into downstream capacitors
Standby mode via SS pin	Logic-level enable/disable (≤0.3 V = OFF) allows system-level power sequencing and low-quiescent operation
Fixed 12 V output architecture	Removes need for external feedback resistor network-reduces component variation and improves production yield

Applications

Industrial Motor Drives	Telecom Power Supplies
Use Scenario: Providing isolated 12 V bias rail for gate drivers and logic in 24/48 V DC-fed motor control inverters. IC Role / Device Role / Timing Role: Primary step-down regulator supplying stable 12 V to isolated gate driver ICs and microcontroller peripherals. Use Value: High efficiency (>92%) minimizes heat in enclosed drive cabinets; self-recovering OCP avoids nuisance shutdown during motor stall events.	Use Scenario: Generating 12 V auxiliary power from -48 V telecom rectifier outputs using inverted buck configuration. IC Role / Device Role / Timing Role: Non-inverting buck controller with robust UVLO (7.2–8.8 V) enabling reliable restart after brownouts. Use Value: 100 mΩ R_DS(on) sustains 5 A output without external MOSFET; SS pin enables synchronized startup with main system controller.
Factory Automation PLCs	Test & Measurement Equipment
Use Scenario: Powering 12 V analog front-ends and digital I/O modules in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 12 V from wide-input 20–48 V field bus. Use Value: Thermal shutdown at 165°C protects against enclosure overheating; load regulation ≤100 mV ensures sensor accuracy across full 0–5 A range.	Use Scenario: Supplying precision 12 V rails for ADC references, op-amp biasing, and FPGA configuration in portable bench instruments. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 12 V source with minimal line/load regulation drift (±1.2 mV/°C). Use Value: Fixed-output architecture eliminates resistor tolerance errors; soft-start prevents voltage overshoot that could damage sensitive analog circuitry.

Industrial Motor Drives

Telecom Power Supplies

Use Scenario: Providing isolated 12 V bias rail for gate drivers and logic in 24/48 V DC-fed motor control inverters.

IC Role / Device Role / Timing Role: Primary step-down regulator supplying stable 12 V to isolated gate driver ICs and microcontroller peripherals.

Use Value: High efficiency (>92%) minimizes heat in enclosed drive cabinets; self-recovering OCP avoids nuisance shutdown during motor stall events.

Use Scenario: Generating 12 V auxiliary power from -48 V telecom rectifier outputs using inverted buck configuration.

IC Role / Device Role / Timing Role: Non-inverting buck controller with robust UVLO (7.2–8.8 V) enabling reliable restart after brownouts.

Use Value: 100 mΩ R_DS(on) sustains 5 A output without external MOSFET; SS pin enables synchronized startup with main system controller.

Factory Automation PLCs

Test & Measurement Equipment

Use Scenario: Powering 12 V analog front-ends and digital I/O modules in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 12 V from wide-input 20–48 V field bus.

Use Value: Thermal shutdown at 165°C protects against enclosure overheating; load regulation ≤100 mV ensures sensor accuracy across full 0–5 A range.

Use Scenario: Supplying precision 12 V rails for ADC references, op-amp biasing, and FPGA configuration in portable bench instruments.

IC Role / Device Role / Timing Role: Low-noise, tightly regulated 12 V source with minimal line/load regulation drift (±1.2 mV/°C).

Use Value: Fixed-output architecture eliminates resistor tolerance errors; soft-start prevents voltage overshoot that could damage sensitive analog circuitry.

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS54560BQPWPRQ1	Wide-input (3.5–60 V), adjustable output, external N-MOSFET; no integrated P-MOSFET	Requires external high-side switch and feedback resistors; supports variable output voltages	Select when adjustable output or higher input voltage range (>48 V) is required
LM5115MT/NOPB	Controller-only (no internal MOSFET); supports synchronous rectification; 50–420 kHz programmable frequency	Needs external high- and low-side MOSFETs; optimized for high-efficiency >95% designs	Select when maximum efficiency or thermal headroom beyond 15 W is critical

Compared with TPS54560BQPWPRQ1 and LM5115MT/NOPB, the TN5D51A-HB11-E offers plug-and-play 12 V regulation with integrated protection and no external MOSFET-ideal for cost-sensitive, space-constrained industrial supplies where fixed output suffices.

Availability

TN5D51A-HB11-E is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, factory automation PLCs, and test & measurement equipment requiring stable component supply and long-term manufacturability.

Supply support for TN5D51A-HB11-E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

SANYO Semiconductor Co., Ltd. was a Japanese semiconductor manufacturer specializing in power management, analog, and discrete devices before its acquisition by ON Semiconductor in 2011.

The TN5D51A-HB11-E belongs to SANYO's ExPD (Excellent-Performance Power & RF Device) family, designed specifically for compact, high-reliability DC-DC conversion in industrial and telecom infrastructure where integrated protection and fixed-output simplicity are prioritized.

FAQ

What is the absolute maximum input voltage rating for the TN5D51A-HB11-E?

The TN5D51A-HB11-E has an absolute maximum input voltage rating of 57 V at the VIN pin. Operation above this voltage-even momentarily-may cause permanent damage. The recommended operating input range is 20–48 V DC per datasheet specifications, ensuring safe margin and optimal regulation performance across temperature and load conditions.

Does the TN5D51A-HB11-E require external components to set output voltage?

No, the TN5D51A-HB11-E provides a fixed 12 V output and does not require external feedback resistors. Its internal voltage reference and error amplifier are configured for 12 V regulation, simplifying design and eliminating resistor tolerance effects. External components needed are limited to input/output capacitors, choke, and freewheeling diode per the application circuit.

How does the soft-start function work on the TN5D51A-HB11-E?

The TN5D51A-HB11-E implements soft-start via an external capacitor connected between the SS pin and GND. Charging this capacitor linearly ramps the internal reference, controlling output voltage rise time. Typical values range from 0.01 μF to 0.22 μF, yielding startup times from ~1 ms to ~100 ms. This prevents inrush current into bulk output capacitance and stabilizes upstream supplies.

Can the TN5D51A-HB11-E be used in standalone 12 V power supply designs without microcontroller control?

Yes, the TN5D51A-HB11-E operates autonomously as a complete switching regulator. It requires only passive external components (capacitors, inductor, diode) and no digital interface or configuration. Standby mode can be left unconnected for always-on operation, or pulled low via simple transistor switch for manual enable/disable-no firmware or communication protocol is needed.

What thermal derating applies to the TN5D51A-HB11-E at elevated ambient temperatures?

The TN5D51A-HB11-E's allowable power dissipation decreases with rising ambient temperature. At T_a = 25°C, PD = 2.0 W; at T_c = 25°C (case temperature), PD = 15 W. Derating curves show usable power drops to ~5 W at T_a = 85°C without heatsink. Use of the TO-220FI5H-HB insulated package with proper heatsinking is essential for sustained 5 A output at elevated temperatures.

TN5D51A-HB11-E Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-220-5 Full Pack, Formed Leads

Packaging:: Bulk

Product Status:: Obsolete

Function:: Step-Down

Output Configuration:: Positive

Topology:: Buck

Output Type:: Fixed

Number of Outputs:: 1

Voltage - Input (Min):: 20V

Voltage - Input (Max):: 48V

Voltage - Output (Min/Fixed):: 12V

Voltage - Output (Max):: -

Current - Output:: 5A

Frequency - Switching:: 150kHz

Synchronous Rectifier:: No

Operating Temperature:: -10°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220F5I5H-HB

TN5D51A-HB11-E FAQ

1.How can I place an order for TN5D51A-HB11-E through Aetrix?

Please submit a Request for Quotation (RFQ) for TN5D51A-HB11-E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TN5D51A-HB11-E reliable?

The price and inventory of TN5D51A-HB11-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TN5D51A-HB11-E is usually 5 days.

3.What payment methods are accepted for TN5D51A-HB11-E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TN5D51A-HB11-E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TN5D51A-HB11-E?

TN5D51A-HB11-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TN5D51A-HB11-E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TN5D51A-HB11-E?

For technical support, including TN5D51A-HB11-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TN5D51A-HB11-E requirements.

6.How does Aetrix verify that TN5D51A-HB11-E is sourced from the original manufacturer or authorized distributors?

All TN5D51A-HB11-E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TN5D51A-HB11-E meets industry standards.

7.What is the process for return or replacement of TN5D51A-HB11-E?

All TN5D51A-HB11-E units undergo pre-shipment inspection (PSI). If there is an issue with TN5D51A-HB11-E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TN5D51A-HB11-E part is unused and in its original packaging.

Return procedure for TN5D51A-HB11-E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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