My Inquiry
My Account
onsemi KSD471ACGTA
- Part No.:
- KSD471ACGTA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
KSD471ACGTA.pdf
- Description:
- TRANS NPN 30V 1A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:64,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
KSD471ACGTA from Fairchild Semiconductor is an NPN epitaxial silicon transistor designed for audio frequency power amplification, with a 1 A collector current rating, 800 mW collector power dissipation, and TO-92 package. It serves as a complement to KSB564A in push-pull amplifier stages and operates reliably up to 150°C junction temperature.
For engineers reviewing the KSD471ACGTA datasheet, pinout, applications, or equivalent options, key selection criteria include DC current gain (hFE = 120–400), VCE(sat) ≤ 0.5 V at IC = 1 A, fT = 130 MHz, and TO-92 mechanical compatibility in low-power linear and switching circuits.
Technical Context
This transistor employs epitaxial base construction for stable hFE across operating current and temperature ranges. Its 30 V VCEO and 40 V VCBO support operation in Class-A/AB audio output stages and relay drivers requiring moderate voltage headroom.
The device exhibits low saturation voltages-VCE(sat) = 0.5 V and VBE(sat) = 1.2 V at IC = 1 A / IB = 0.1 A-enabling efficient power delivery in compact linear amplifiers and discrete switch applications without forced cooling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 30 V - Maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC | 1 A - Continuous collector current handling capacity under specified thermal conditions |
| PC | 800 mW - Maximum power dissipation at TA = 25°C without derating |
| hFE | 120–400 - DC current gain range at VCE = 1 V, IC = 100 mA, enabling predictable biasing |
| fT | 130 MHz - Unity-gain bandwidth confirming suitability for audio-frequency amplification |
| VCE(sat) | ≤ 0.5 V - Low saturation voltage ensures minimal conduction loss in switching mode |
| Cob | 16 pF - Output capacitance at VCB = 6 V, limiting high-frequency roll-off in tuned circuits |
Pinout & Package
Package: TO-92, straight-lead JEDEC-compliant plastic case with center-collector configuration (suffix "C"); pin 1 = Emitter, pin 2 = Collector, pin 3 = Base.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path for majority carriers | Connected to ground or low-impedance return in common-emitter amplifier configurations |
| 2 (Collector) | Current entry path under forward-active bias | Center-pin placement enables symmetrical heat-sinking and simplifies PCB layout in dual-transistor pairs |
| 3 (Base) | Control terminal for minority-carrier injection | Receives drive current to regulate IC; requires series resistor to limit IB per hFE and load requirements |
Key Features
| Feature | Design Value |
|---|---|
| Audio frequency power amplification | Optimized fT = 130 MHz and low VCE(sat) support clean signal reproduction in pre-driver and output stages |
| Complement to KSB564A | Enables matched push-pull operation with PNP counterpart for balanced distortion performance |
| TO-92 center-collector pinout | Pin 2 = Collector improves thermal coupling to heatsink pads and reduces lead inductance in high-current paths |
| 150°C maximum junction temperature | Allows reliable operation in enclosed enclosures or ambient temperatures up to +85°C with minimal derating |
Applications
| Audio Power Amplifier Stage | Relay Driver Circuit |
|---|---|
Use Scenario: Final output stage of a 1–2 W mono audio amplifier driving 8 Ω speakers. IC Role / Device Role / Timing Role: NPN power switch amplifying line-level input into speaker-current output via emitter-follower or common-emitter topology. Use Value: Delivers full 1 A peak current with VCE(sat) ≤ 0.5 V, minimizing heat generation and preserving dynamic range. | Use Scenario: Driving 12 V, 500 mA electromagnetic relay coil from microcontroller GPIO. IC Role / Device Role / Timing Role: Discrete switch controlling relay coil energization/de-energization with fast turn-on/turn-off. Use Value: hFE ≥ 120 ensures sufficient gain to saturate with ≤ 5 mA base drive, reducing MCU I/O loading. |
| DC Motor Speed Control | Low-Power Linear Regulator Pass Element |
Use Scenario: PWM-controlled H-bridge half-bridge leg for bidirectional 3–6 V brushed DC motor control. IC Role / Device Role / Timing Role: High-side or low-side switching element handling continuous 500–800 mA motor current. Use Value: 30 V VCEO provides margin against inductive kickback; TO-92 footprint allows dense layout in compact motor modules. | Use Scenario: Series pass transistor in adjustable 1.2–12 V, 500 mA linear regulator using LM317 feedback network. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output by dissipating excess input-output differential. Use Value: 800 mW PC supports up to 1.6 V dropout at 500 mA, enabling stable regulation without external heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD47T4G | TO-220 package, higher PC = 1.5 W, same VCEO/IC, but larger footprint and higher thermal mass | Suitable for higher-power amplifiers or industrial controls where board space permits | Select when >800 mW dissipation or improved thermal stability is required; not drop-in compatible due to package change |
| BC547B | TO-92, lower IC = 100 mA, PC = 500 mW, hFE = 200–450, no center-collector pinout | Applicable only in low-current pre-amplifier or signal-switching roles-not for power output | Choose only for small-signal gain stages; cannot replace KSD471ACGTA in 1 A load applications |
Compared with MJD47T4G and BC547B, the KSD471ACGTA uniquely balances 1 A current capability, TO-92 form factor, and center-collector pinout-making it optimal for space-constrained audio and relay driver designs requiring discrete power switching without thermal derating.
Availability
KSD471ACGTA is available at Aetrix Electronics and suitable for audio amplifiers, relay drivers, DC motor controllers, and low-power linear regulators requiring stable component supply and consistent parametric performance across production lots.
Supply support for KSD471ACGTA 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
Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and discrete power components before its acquisition by ON Semiconductor in 2016.
The KSD471ACGTA belongs to Fairchild's legacy general-purpose bipolar transistor product line, engineered for cost-sensitive, medium-current linear and switching applications in consumer and industrial electronics.
FAQ
What is the pin configuration of KSD471ACGTA?
The KSD471ACGTA uses a TO-92 package with center-collector pinout: Pin 1 is Emitter, Pin 2 is Collector (center), and Pin 3 is Base. This configuration is confirmed in the official Fairchild datasheet Rev. 1.1.0 and distinguishes it from standard emitter-center variants. The "C" suffix explicitly denotes this arrangement, critical for correct PCB layout and thermal design in the KSD471ACGTA implementation.
What is the DC current gain (hFE) range for KSD471ACGTA?
The KSD471ACGTA offers two hFE classifications: "Y" (120–240) and "G" (200–400), measured at VCE = 1 V and IC = 100 mA. The "G" grade is typical for the KSD471ACGTA variant, providing higher and more consistent gain for precision biasing in audio amplifier stages and relay drivers where stable current amplification is essential for the KSD471ACGTA application.
Can KSD471ACGTA be used in switching applications?
Yes, the KSD471ACGTA supports switching use with VCE(sat) ≤ 0.5 V at IC = 1 A / IB = 0.1 A and fT = 130 MHz, enabling clean turn-on/turn-off in relay drivers and low-speed PWM motor control. Its 150°C TJ rating and 800 mW power dissipation allow intermittent switching without thermal runaway, making the KSD471ACGTA viable for robust discrete switching where MOSFETs are over-specified.
What is the maximum collector-emitter voltage rating for KSD471ACGTA?
The KSD471ACGTA has a maximum collector-emitter voltage (VCEO) rating of 30 V at TA = 25°C. This value is defined under open-base conditions and must be derated linearly above 25°C ambient. Designers must ensure that transient voltages-including inductive spikes in relay or motor loads-remain below this threshold to prevent avalanche failure in any KSD471ACGTA circuit implementation.
Is KSD471ACGTA RoHS compliant?
The KSD471ACGTA was manufactured under Fairchild's RoHS-compliant processes prior to the ON Semiconductor acquisition. Per Fairchild documentation and distributor records (e.g., Digi-Key, Mouser), the KSD471ACGTA carries RoHS-6 compliance certification. For formal compliance verification, refer to the original Fairchild RoHS declaration referenced in the KSD471ACGTA datasheet Rev. 1.1.0 and confirm material content via Aetrix Electronics' traceable lot documentation.
KSD471ACGTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Bulk
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 200 @ 100mA, 1V
- Power - Max:
- 800 mW
- Frequency - Transition:
- 130MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
KSD471ACGTA FAQ
1.How can I place an order for KSD471ACGTA through Aetrix?
Please submit a Request for Quotation (RFQ) for KSD471ACGTA 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 KSD471ACGTA reliable?
The price and inventory of KSD471ACGTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSD471ACGTA is usually 5 days.
3.What payment methods are accepted for KSD471ACGTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSD471ACGTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSD471ACGTA?
KSD471ACGTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSD471ACGTA 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 KSD471ACGTA?
For technical support, including KSD471ACGTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSD471ACGTA requirements.
6.How does Aetrix verify that KSD471ACGTA is sourced from the original manufacturer or authorized distributors?
All KSD471ACGTA 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 KSD471ACGTA meets industry standards.
7.What is the process for return or replacement of KSD471ACGTA?
All KSD471ACGTA units undergo pre-shipment inspection (PSI). If there is an issue with KSD471ACGTA, 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 KSD471ACGTA part is unused and in its original packaging.
Return procedure for KSD471ACGTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
KSD471ACGTA 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…
