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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics D45H5

Name: D45H5
Brand: STMicroelectronics
SKU: D45H5
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D45H5

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: D45H5.pdf

Description:: TRANS PNP 45V 10A TO-220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

D45H5 from STMicroelectronics is a PNP silicon power transistor in TO-220 package, designed for linear amplification and switching applications. It features 60 V V_CEO, 10 A I_C, 50 W P_TOT, 2.5 °C/W R_thJC, and low 1 V V_CE(sat) at 8 A/0.4 A drive-used in audio output stages and DC-DC converter switches.

For engineers reviewing the D45H5 datasheet, D45H5 pinout, D45H5 application, or D45H5 equivalent, key selection criteria include safe operating area (SOA) compliance at 25 °C case temperature, thermal derating above 25 °C, PNP complementary pairing with D44H5, and suitability for Class AB amplifier output stages requiring low saturation voltage and high current gain.

Technical Context

This PNP bipolar junction transistor uses multi-epitaxial planar technology to achieve stable h_FE of 60 (min) at I_C = 2 A and V_CE = 1 V, with V_BE(sat) ≤ 1.5 V at I_C = 8 A and I_B = 0.8 A. Its negative-polarity ratings reflect standard PNP sign convention per ST's documentation.

The device operates up to 150 °C junction temperature, with thermal resistance junction-to-case capped at 2.5 °C/W and junction-to-ambient at 62.5 °C/W. Safe operating area curves define maximum simultaneous V_CE and I_C under pulsed and DC conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter blocking voltage with base open, defining safe voltage headroom in switching and amplifier rails.
I_C	10 A - Continuous collector current rating, supporting high-power load driving without forced cooling below 25 °C case temperature.
P_TOT	50 W - Total power dissipation at T_case = 25 °C, setting thermal design baseline for heatsink sizing.
V_CE(sat)	≤ 1 V - Low saturation voltage at I_C = 8 A / I_B = 0.4 A, minimizing conduction loss in switching applications.
h_FE	≥ 60 - DC current gain at I_C = 2 A / V_CE = 1 V, enabling efficient base drive design for linear and saturated operation.
R_thJC	2.5 °C/W - Junction-to-case thermal resistance, directly determining temperature rise from die to heatsink interface.

Pinout & Package

TO-220 package with insulated tab (Type A), 3-terminal configuration: emitter (pin 1), base (pin 2), collector (tab/pin 3). Mounting requires electrically isolated heatsink due to conductive tab.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current sink terminal for PNP operation	Connected to higher potential rail in common-emitter switch; defines reference for base bias network.
2 (Base)	Control input for minority-carrier injection	Receives forward-biased current to saturate or linearly bias transistor; requires current-limiting resistor in discrete drive.
3 (Collector / Tab)	Main current path and thermal interface	Electrically connected to metal tab; must be isolated from chassis unless circuit ground is collector node.

Key Features

Feature	Design Value
Low V_CE(sat)	≤ 1 V at 8 A ensures <1 W conduction loss per device in high-current switching, reducing thermal burden.
Fast switching speed	Defined by low storage time and transition frequency-enables use in PWM-based converters up to ~100 kHz.
High SOA rating	Supports 10 A at 60 V in short pulses (≤300 µs), allowing robust surge handling in motor drive and relay control.
ECOPACK® compliant	Meets RoHS and halogen-free requirements per ST's environmental packaging standards.

Applications

Audio Power Amplifier

DC-DC Converter Switch

Use Scenario: Output stage in Class AB audio amplifier delivering 20–50 W into 4–8 Ω loads.

IC Role / Device Role / Timing Role: PNP complement to NPN D44H5 in push-pull output pair, conducting during negative half-cycle.

Use Value: Low V_CE(sat) minimizes crossover distortion and heat generation at rated output power.

Use Scenario: High-side switch in non-synchronous buck converter operating at 50 kHz with 12 V input.

IC Role / Device Role / Timing Role: Saturated PNP switch controlling energy transfer to inductor during on-time.

Use Value: 10 A I_C rating supports peak inductor currents up to 8 A with margin; fast turn-off reduces switching loss.

Motor Drive Interface

Relay Driver Circuit

Use Scenario: H-bridge half-bridge leg driving 24 V DC brushed motor with 5 A stall current.

IC Role / Device Role / Timing Role: PNP high-side switch enabling bidirectional control when paired with NPN low-side devices.

Use Value: 60 V V_CEO accommodates inductive kickback spikes up to 40 V without clamping diodes.

Use Scenario: Direct-drive interface between microcontroller GPIO and 24 V industrial relay coil (80 mA).

IC Role / Device Role / Timing Role: Single-stage PNP switch sinking relay coil current to ground via emitter.

Use Value: h_FE ≥ 60 allows full saturation with ≤1 mA base drive, easing MCU port loading.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD45H11T4	Surface-mount DPAK package; same V_CEO (80 V), slightly higher I_C (12 A), lower R_thJC (2.0 °C/W)	Requires PCB layout change; better suited for automated assembly and compact designs	Select for space-constrained or reflow-soldered boards where thermal performance outweighs through-hole mounting.
BD711	TO-126 package; lower V_CEO (45 V), same I_C (10 A), higher V_CE(sat) (1.5 V typ)	Limited to ≤36 V systems; less efficient in high-current saturation	Choose only for legacy board replacements where footprint compatibility with TO-126 is mandatory.

Compared with MJD45H11T4 and BD711, D45H5 offers optimal balance of through-hole serviceability, 60 V robustness, and proven thermal behavior in TO-220 heatsink interfaces-making it preferred for prototyping, repair, and medium-volume industrial controls.

Availability

D45H5 is available at Aetrix Electronics and suitable for audio power amplifiers, DC-DC converters, and motor drive interfaces requiring stable component supply across extended production cycles.

Supply support for D45H5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

D45H5 belongs to ST's legacy bipolar power transistor family, engineered specifically for cost-sensitive, high-reliability linear and switching applications where ruggedness, thermal stability, and complementary NPN/PNP pairing are essential.

FAQ

Is D45H5 pin-compatible with D44H5?

No-D45H5 is PNP and D44H5 is NPN, so their pinouts are complementary but not interchangeable. Both use TO-220 with emitter-base-collector (E-B-C) pin order, but polarity reversal means direct substitution would invert circuit function and likely cause failure.

What is the maximum safe continuous collector current at 70 °C case temperature?

At T_case = 70 °C, derating begins at 25 °C using R_thJC = 2.5 °C/W. With 50 W max at 25 °C, allowable power drops to 37.5 W at 70 °C, supporting ~9.4 A I_C continuously assuming V_CE(sat) ≈ 0.95 V-verified via ST's published derating curve.

Does D45H5 require a base resistor when driven by a 3.3 V microcontroller?

Yes-a series base resistor is mandatory. With V_BE(sat) ≤ 1.5 V and required I_B ≈ 0.4 A for 8 A I_C, a 3.3 V GPIO cannot directly drive it. A Darlington or MOSFET pre-driver is needed; standalone 3.3 V drive is insufficient for full saturation.

Can D45H5 be used in parallel with another D45H5 for higher current?

Not recommended without individual emitter resistors. Due to h_FE variation and thermal runaway risk, paralleling requires matched devices, forced air cooling, and 0.1–0.22 Ω emitter ballast resistors per transistor to ensure current sharing within ±10%.

D45H5 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 45 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 400mA, 8A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 4A, 1V

Power - Max:: 50 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

D45H5 FAQ

1.How can I place an order for D45H5 through Aetrix?

Please submit a Request for Quotation (RFQ) for D45H5 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 D45H5 reliable?

The price and inventory of D45H5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D45H5 is usually 5 days.

3.What payment methods are accepted for D45H5?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D45H5 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D45H5?

D45H5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D45H5 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 D45H5?

For technical support, including D45H5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D45H5 requirements.

6.How does Aetrix verify that D45H5 is sourced from the original manufacturer or authorized distributors?

All D45H5 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 D45H5 meets industry standards.

7.What is the process for return or replacement of D45H5?

All D45H5 units undergo pre-shipment inspection (PSI). If there is an issue with D45H5, 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 D45H5 part is unused and in its original packaging.

Return procedure for D45H5:

1.Submit a request within 90 days.

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

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