Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

onsemi D45H8

Name: D45H8
Brand: onsemi
SKU: D45H8
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: D45H8

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: D45H8.pdf

Description:: TRANS PNP 60V 10A TO-220

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:9,288

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

D45H8 from onsemi is a PNP silicon power transistor in TO-220 package, rated for 60 V_CEO, 10 A continuous collector current, and 70 W total power dissipation at T_C = 25°C. It delivers low V_CE(sat) ≤ 1.0 V (at I_C = 8 A, I_B = 0.4 A) and fast switching with t_d + t_r ≤ 135 ns, enabling use in high-efficiency switching regulators and audio output stages.

For engineers reviewing the D45H8 datasheet, pinout, applications, or equivalent options, key selection criteria include complementary pairing with D44H8, thermal resistance R_JC = 1.8 °C/W, DC current gain h_FE ≥ 60 at I_C = 2 A, and Pb-free RoHS-compliant packaging for industrial power stage designs.

Technical Context

The D45H8 operates as a medium-power PNP bipolar junction transistor optimized for linear amplification and hard-switching applications. Its design supports complementary operation with the NPN D44H8, sharing identical TO-220 package pinout and thermal characteristics while delivering matched V_CE(sat) and f_T = 40 MHz performance.

It features a maximum junction temperature of +150°C, 5.0 V_EB rating, and safe operating area (SOA) validated for pulse widths ≤ 6 ms and duty cycles ≤ 50%. Thermal resistance values (R_JA = 62.5 °C/W, R_JC = 1.8 °C/W) define its heatsink interface requirements and ambient derating behavior.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 Vdc - Maximum collector-emitter blocking voltage before breakdown under open-base conditions
I_C (cont.)	10 Adc - Continuous collector current capability with adequate heatsinking at T_C = 25°C
V_CE(sat)	≤1.0 V - Low saturation voltage ensures <10 W conduction loss at 8 A, critical for efficiency in switching converters
h_FE	≥60 - Minimum DC current gain at I_C = 2 A, V_CE = 1 V enables predictable base drive sizing
f_T	40 MHz - Gain-bandwidth product confirms suitability for audio-frequency amplification and sub-MHz switching
R_JC	1.8 °C/W - Junction-to-case thermal resistance defines minimum heatsink requirement for 70 W dissipation
t_d + t_r	≤135 ns - Combined delay and rise time supports switching frequencies up to ~1 MHz in hard-switched topologies

Pinout & Package

Package: TO-220 (Case 221A, Style 1), plastic-encapsulated, through-hole mounting, with metal tab electrically connected to collector (pins 2 and 4).

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires ~0.4 A base current to saturate at 8 A collector load
2 & 4	Collector	High-current output terminal; electrically tied to metal tab for direct heatsink mounting
3	Emitter	Current return path; referenced to system ground in common-emitter configurations

Key Features

Feature	Design Value
Complementary Pairing	Matched electrical specs and identical TO-220 footprint with D44H8 enable push-pull amplifier and H-bridge driver designs without layout revision
Low Saturation Voltage	V_CE(sat) ≤ 1.0 V reduces conduction losses by >30% vs. legacy PNP transistors at 8 A, improving thermal margin
Pb-Free & RoHS	G-suffix marking confirms lead-free termination and compliance with EU RoHS Directive 2011/65/EU for environmentally regulated production
Robust SOA	Validated safe operating area supports 60 V × 10 A pulses at 50% duty cycle, enabling reliable operation in flyback and forward converter primary switches

Applications

Audio Power Amplifiers	DC-DC Switching Regulators
Use Scenario: Output stage in Class AB audio amplifiers delivering 20–50 W into 4–8 Ω loads. IC Role / Device Role / Timing Role: PNP output transistor in complementary emitter-follower configuration, handling negative half-cycle current. Use Value: Low V_CE(sat) minimizes crossover distortion and improves thermal stability at high bias currents.	Use Scenario: High-side switch in non-isolated buck or boost converter operating at 100–500 kHz. IC Role / Device Role / Timing Role: Main switching transistor controlling energy transfer from input to inductor/capacitor network. Use Value: Fast t_d + t_r ≤ 135 ns and f_T = 40 MHz support efficient switching with minimal dead-time penalties.
Motor Drive Half-Bridges	Linear Voltage Regulators
Use Scenario: Upper-leg switch in 12–48 V brushed DC motor H-bridge drivers. IC Role / Device Role / Timing Role: PNP high-side switch enabling bidirectional current control with gate/base drive isolation. Use Value: Matched h_FE and V_CE(sat) with D44H8 ensures symmetrical turn-on/turn-off timing and reduced shoot-through risk.	Use Scenario: Pass transistor in adjustable positive linear regulators supplying 1–3 A at 5–24 V output. IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output voltage difference as heat. Use Value: 70 W power rating and R_JC = 1.8 °C/W allow stable operation with modest heatsinking at full load.

Audio Power Amplifiers

DC-DC Switching Regulators

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

IC Role / Device Role / Timing Role: PNP output transistor in complementary emitter-follower configuration, handling negative half-cycle current.

Use Value: Low V_CE(sat) minimizes crossover distortion and improves thermal stability at high bias currents.

Use Scenario: High-side switch in non-isolated buck or boost converter operating at 100–500 kHz.

IC Role / Device Role / Timing Role: Main switching transistor controlling energy transfer from input to inductor/capacitor network.

Use Value: Fast t_d + t_r ≤ 135 ns and f_T = 40 MHz support efficient switching with minimal dead-time penalties.

Motor Drive Half-Bridges

Linear Voltage Regulators

Use Scenario: Upper-leg switch in 12–48 V brushed DC motor H-bridge drivers.

IC Role / Device Role / Timing Role: PNP high-side switch enabling bidirectional current control with gate/base drive isolation.

Use Value: Matched h_FE and V_CE(sat) with D44H8 ensures symmetrical turn-on/turn-off timing and reduced shoot-through risk.

Use Scenario: Pass transistor in adjustable positive linear regulators supplying 1–3 A at 5–24 V output.

IC Role / Device Role / Timing Role: Series pass element dissipating excess input-output voltage difference as heat.

Use Value: 70 W power rating and R_JC = 1.8 °C/W allow stable operation with modest heatsinking at full load.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD45H11T4G	Different package (DPAK), lower I_C = 8 A, higher V_CEO = 80 V, R_JA = 60 °C/W	Suitable for surface-mount designs with space constraints but requires PCB-level thermal vias for equivalent power handling	Select when SMT assembly is mandatory and peak voltage exceeds 60 V; not drop-in compatible with D45H8 footprint
BD679A	TO-126 package, I_C = 4 A, V_CEO = 80 V, h_FE = 40–250, no Pb-free marking	Limited to lower-power linear amplifiers and relay drivers due to reduced current rating and thermal capability	Choose only for cost-sensitive, low-volume legacy designs where 10 A rating is unnecessary and RoHS compliance is not required

Compared with MJD45H11T4G and BD679A, the D45H8 provides superior thermal performance (R_JC = 1.8 °C/W), higher continuous current (10 A), and guaranteed Pb-free compliance-making it optimal for through-hole industrial power stages requiring reliability and regulatory alignment.

Availability

D45H8 is available at Aetrix Electronics and suitable for switching regulators, audio power amplifiers, and motor drive circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for D45H8 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

onsemi (formerly ON Semiconductor) is a global semiconductor manufacturer specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The D45H8 belongs to the D45H Series of complementary PNP power transistors, engineered specifically for high-reliability linear and switching power applications where matched NPN/PNP pairs, low saturation voltage, and robust SOA are essential.

FAQ

What is the maximum collector-emitter voltage rating for the D45H8?

The D45H8 has a maximum collector-emitter sustaining voltage (V_CEO(sus)) of 60 Vdc under specified test conditions (I_C = 30 mA, I_B = 0 A). This rating defines the absolute upper limit for safe blocking operation in off-state configurations such as high-side switches or amplifier output stages. Exceeding this voltage risks avalanche breakdown and permanent device failure.

Is the D45H8 pin-compatible with the D44H8?

Yes, the D45H8 is pin-compatible with the D44H8: both use identical TO-220 (Case 221A) packages with base (pin 1), collector (pins 2 & 4), and emitter (pin 3) assigned identically. This allows direct placement in complementary circuits-such as push-pull amplifiers or H-bridge drivers-without PCB layout changes, provided thermal and electrical design margins are verified for each device's polarity-specific behavior.

What is the DC current gain (h_FE) specification for the D45H8 at typical operating conditions?

The D45H8 guarantees a minimum DC current gain (h_FE) of 60 when tested at V_CE = 1.0 Vdc and I_C = 2.0 Adc. This value is confirmed in the official onsemi datasheet and reflects worst-case gain under standard linear operation. At higher currents (e.g., I_C = 4 A), h_FE drops to ≥40, which must be accounted for in base drive circuit design to ensure full saturation.

Does the D45H8 have RoHS-compliant packaging?

Yes, the D45H8 is supplied in a Pb-free RoHS-compliant package, indicated by the "G" suffix in its full ordering code (e.g., D45H8G). This complies with EU Directive 2011/65/EU and meets J-STD-609 moisture sensitivity level 1 requirements. The device uses matte tin lead finish and passes all mandated leachability and homogeneous material testing per IPC-J-STD-020.

What thermal resistance values apply to the D45H8 in practical heatsink mounting?

The D45H8 specifies R_JC = 1.8 °C/W (junction-to-case) and R_JA = 62.5 °C/W (junction-to-ambient, unmounted). When mounted to a heatsink via the metal tab (collector), actual thermal performance depends on interface material quality and heatsink size. For 70 W dissipation at T_C = 25°C, a heatsink with ≤ 1.0 °C/W thermal resistance is required to maintain T_J ≤ 150°C.

D45H8 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

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):: 60 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:: 2 W

Frequency - Transition:: 40MHz

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

D45H8 FAQ

1.How can I place an order for D45H8 through Aetrix?

Please submit a Request for Quotation (RFQ) for D45H8 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 D45H8 reliable?

The price and inventory of D45H8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D45H8 is usually 5 days.

3.What payment methods are accepted for D45H8?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D45H8 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D45H8?

D45H8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D45H8 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 D45H8?

For technical support, including D45H8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D45H8 requirements.

6.How does Aetrix verify that D45H8 is sourced from the original manufacturer or authorized distributors?

All D45H8 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 D45H8 meets industry standards.

7.What is the process for return or replacement of D45H8?

All D45H8 units undergo pre-shipment inspection (PSI). If there is an issue with D45H8, 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 D45H8 part is unused and in its original packaging.

Return procedure for D45H8:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-09 Counterfeit Electronic Components: How to Detect, Authenticate, and Test Suspect Parts

Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…