My Inquiry
My Account
onsemi D45C11
- Part No.:
- D45C11
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
D45C11.pdf
- Description:
- TRANS PNP 80V 4A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:9,230
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
D45C11 from ON Semiconductor is a PNP bipolar junction transistor designed as a high-current driver for power amplifier, regulator, and switching circuits requiring speed and robust thermal performance. It features -80 V VCEO, -4.0 A continuous collector current, 32 MHz fT, -0.5 V VCE(sat) at -1.0 A, and TO-220 package with 2.1 °C/W RθJC, enabling use in industrial motor control and DC-DC converter output stages.
For engineers reviewing the D45C11 datasheet, pinout, applications, or equivalent options, key selection criteria include its PNP polarity, -4.0 A IC rating, -80 V breakdown voltage, saturation behavior under high base drive, and thermal resistance suitability for heatsink-mounted linear or switching operation.
Technical Context
The D45C11 operates as a medium-power PNP BJT optimized for fast-switching and linear current amplification. Its Process 5P fabrication yields low saturation voltages (-0.5 V at -1.0 A), high fT (32 MHz), and controlled Cob (125 pF), supporting stable gain-bandwidth trade-offs in audio and SMPS feedback paths.
It functions with fixed-base or emitter-follower biasing, delivering hFE of 40–120 across -0.2 A to -1.0 A, and maintains safe operation up to +150 °C junction temperature. Its -10 μA ICES and -100 μA IEBO ensure low leakage in standby regulation and precision current sourcing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -80 V - Maximum reverse-biased collector-emitter voltage before breakdown; defines safe operating range in high-side PNP switch or series pass regulator. |
| IC (cont.) | -4.0 A - Continuous collector current capability; supports high-current load driving without derating below 25 °C ambient. |
| fT | 32 MHz - Current-gain bandwidth product; enables stable operation up to ~10 MHz in small-signal amplifier or feedback loop compensation. |
| VCE(sat) | -0.5 V @ -1.0 A / -50 mA - Low saturation voltage ensures minimal conduction loss in switching applications, reducing heat generation. |
| RθJC | 2.1 °C/W - Junction-to-case thermal resistance; allows direct mounting to heatsink for sustained >2 W dissipation in linear mode. |
| hFE | 40–120 @ -0.2 A to -1.0 A - Wide DC current gain range supports reliable biasing across varying load conditions without external gain stabilization. |
Pinout & Package
Package: TO-220 (3-lead, straight lead, insulated tab). Standard through-hole mounting with metal tab electrically connected to collector for efficient heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives forward-biased current to turn on device; requires sufficient IB (e.g., -50 mA) to achieve specified VCE(sat). |
| 2 (Collector) | High-current output node | Connected to metal tab and internal die; must be electrically isolated from heatsink unless collector referenced to ground. |
| 3 (Emitter) | Current source reference | Serves as common return path; typically tied to positive rail in high-side switch or series regulator configurations. |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | 32 MHz fT and 125 pF Cob enable clean edge transitions in PWM-driven loads up to 500 kHz. |
| Low saturation loss | -0.5 V VCE(sat) at -1.0 A reduces conduction losses by >30% vs. standard PNP transistors with comparable IC. |
| Thermally robust packaging | TO-220 with 2.1 °C/W RθJC supports >3 W continuous dissipation with modest heatsinking. |
| Stable gain over current range | hFE = 40–120 across -0.2 A to -1.0 A enables predictable bias design without gain compensation networks. |
Applications
| Audio Power Amplifier Output Stage | Linear Voltage Regulator Pass Element |
|---|---|
Use Scenario: Driving speaker loads in Class AB amplifier output stage with complementary NPN/PNP pair. IC Role / Device Role / Timing Role: PNP current driver providing negative half-cycle current sourcing with matched thermal tracking. Use Value: -4.0 A IC and -0.5 V VCE(sat) minimize crossover distortion and thermal runaway risk during high-power output. | Use Scenario: Series pass element in adjustable positive-output linear regulator supplying microcontroller subsystems. IC Role / Device Role / Timing Role: High-current PNP pass transistor regulating output by modulating emitter-collector current based on error amplifier signal. Use Value: -80 V VCEO and -10 μA ICES ensure stability under wide input voltage swings and low quiescent current in standby mode. |
| DC-DC Converter Synchronous Rectifier Driver | Industrial Motor Control H-Bridge High-Side Switch |
Use Scenario: Gate driver for P-channel MOSFET in synchronous buck converter secondary side. IC Role / Device Role / Timing Role: Fast-switching PNP current source delivering peak gate charge current to MOSFET gate during turn-on transition. Use Value: 32 MHz fT and low Cob support sub-100 ns rise/fall times, minimizing dead-time losses in high-frequency converters. | Use Scenario: High-side switch in brushed DC motor H-bridge controlling direction and braking via PWM. IC Role / Device Role / Timing Role: PNP-based high-side current driver sinking load current when activated, paired with NPN low-side switch. Use Value: TO-220 package with insulated tab allows direct heatsink mounting while maintaining electrical isolation from chassis ground. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP current driver transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD45C | Same VCEO (-80 V), lower IC (-3.0 A), higher VCE(sat) (-0.8 V @ -1.0 A), TO-252 package. | Suitable for surface-mount designs with lower current demand; less suitable for >3 A linear operation due to higher saturation loss. | Select MJD45C only if PCB layout requires SMT and peak load current remains ≤3 A. |
| BD711 | Higher VCEO (-100 V), same IC (-4.0 A), higher VCE(sat) (-0.9 V @ -1.0 A), TO-126 package. | Better for higher-input-voltage regulators; limited thermal performance (RθJC = 5 °C/W) restricts continuous power handling. | Choose BD711 only when >80 V breakdown margin is required and heatsinking is constrained. |
Compared with MJD45C and BD711, the D45C11 delivers superior thermal efficiency (2.1 °C/W), lowest VCE(sat), and proven suitability for high-duty-cycle linear operation-making it the preferred choice for heatsink-mounted, high-current PNP driver roles where reliability and conduction loss matter most.
Availability
D45C11 is available at Aetrix Electronics and suitable for industrial motor control, audio amplifier output stages, and linear voltage regulator designs requiring stable component supply, long-lifecycle availability, and traceable sourcing from authorized channels.
Supply support for D45C11 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensor, and logic solutions for automotive, industrial, and consumer markets.
The D45C11 belongs to ON Semiconductor's legacy high-power bipolar transistor portfolio, originally developed by Fairchild Semiconductor for demanding linear and switching current driver applications requiring speed, ruggedness, and thermal reliability.
FAQ
What is the maximum continuous collector current rating for the D45C11?
The D45C11 has a maximum continuous collector current (IC) rating of -4.0 A at TA = 25 °C. This rating assumes proper heatsinking; derating applies above 25 °C ambient per the 480 mW/°C specification. The D45C11 must not exceed this limit in sustained operation to avoid thermal runaway or permanent damage.
Does the D45C11 have a built-in base-emitter resistor or protection diode?
No, the D45C11 is a standard three-terminal PNP bipolar transistor with no integrated base-emitter resistors or protection diodes. External base current limiting and flyback protection (e.g., base-emitter clamp diode) must be implemented per application requirements. The D45C11 relies on discrete external components for safe switching and linear operation.
Can the D45C11 be used in parallel with another D45C11 for higher current capacity?
Parallel operation of D45C11 devices is not recommended without individual emitter resistors and matched hFE bins. Due to inherent parameter variation (e.g., VBE(sat), hFE), unbalanced current sharing can occur. If required, use 0.1–0.5 Ω emitter resistors per D45C11 and verify thermal coupling; the D45C11 itself does not include features to facilitate paralleling.
What is the typical thermal resistance from junction to case (RθJC) for the D45C11?
The D45C11 has a specified RθJC of 2.1 °C/W, measured from junction to the metal tab (collector terminal). This value assumes proper mechanical mounting with thermal interface material and adequate heatsink mass. It enables the D45C11 to dissipate over 3 W continuously when mounted to a well-designed heatsink, making it suitable for linear regulator and amplifier applications.
Is the D45C11 RoHS compliant and halogen-free?
Yes, the D45C11 is RoHS compliant and halogen-free per ON Semiconductor's product change notifications and material declarations. As a legacy Fairchild part now managed under ON Semiconductor, the D45C11 meets JEDEC J-STD-609 Category 1 for halogen content and complies with EU Directive 2011/65/EU. Full compliance documentation is available upon request for the D45C11.
D45C11 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 80 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 1A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 200mA, 1V
- Power - Max:
- 60 W
- Frequency - Transition:
- 32MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
D45C11 FAQ
1.How can I place an order for D45C11 through Aetrix?
Please submit a Request for Quotation (RFQ) for D45C11 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 D45C11 reliable?
The price and inventory of D45C11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D45C11 is usually 5 days.
3.What payment methods are accepted for D45C11?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D45C11 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for D45C11?
D45C11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your D45C11 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 D45C11?
For technical support, including D45C11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D45C11 requirements.
6.How does Aetrix verify that D45C11 is sourced from the original manufacturer or authorized distributors?
All D45C11 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 D45C11 meets industry standards.
7.What is the process for return or replacement of D45C11?
All D45C11 units undergo pre-shipment inspection (PSI). If there is an issue with D45C11, 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 D45C11 part is unused and in its original packaging.
Return procedure for D45C11:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
D45C11 Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
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, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
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.
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.
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…
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…
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…
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 …
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…
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…
