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onsemi BC33825TA
- Part No.:
- BC33825TA
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
BC33825TA.pdf
- Description:
- TRANS NPN 25V 0.8A TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:795
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Product details
Overview
BC33825TA from ON Semiconductor is an NPN epitaxial silicon transistor in TO-92 package, rated for 30 V VCEO, 800 mA IC, and 625 mW PD, optimized for low-power switching and audio amplifier stages in consumer electronics and industrial control circuits.
For engineers reviewing the BC33825TA datasheet, pinout, applications, or equivalent options, key selection criteria include its hFE range of 160–400 at IC = 100 mA, VCE(sat) ≤ 0.7 V at 500 mA/50 mA drive, and compatibility with BC328 complementary PNP devices in push-pull configurations.
Technical Context
The BC33825TA operates as a general-purpose bipolar junction transistor with fixed-emitter configuration and DC current gain defined across two test conditions: hFE1 (VCE = 1 V, IC = 100 mA) and hFE2 (VCE = 1 V, IC = 300 mA). Its breakdown ratings are specified at TA = 25°C with strict derating above that temperature.
Thermal performance is characterized by RθJA = 200°C/W on standard FR-4 PCB (76 mm × 114 mm), and electrical behavior includes fT = 100 MHz at VCE = 5 V, IC = 10 mA, confirming suitability for low-frequency amplification and switching up to several megahertz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 25 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe operating voltage in common-emitter switch designs. |
| IC (DC) | 800 mA - Continuous collector current rating; supports medium-current driver stages without forced cooling. |
| PD | 625 mW - Total power dissipation at 25°C ambient; requires thermal derating of 5 mW/°C above that temperature. |
| hFE (100 mA) | 160–400 - DC current gain range at VCE = 1 V, enabling predictable base drive sizing for linear and saturated operation. |
| VCE(sat) | ≤ 0.7 V at IC = 500 mA, IB = 50 mA - Low saturation voltage minimizes conduction loss in switching applications. |
| fT | 100 MHz - Current-gain bandwidth product; confirms usable gain at audio and low-RF frequencies. |
Pinout & Package
BC33825TA uses the standard TO-92 3-lead plastic package with straight or bent leads depending on packing method (Ammo here); pin 1 is Collector, pin 2 is Base, pin 3 is Emitter - verified per JEDEC TO-92 outline and Fairchild BC337/BC338 Rev. 1.5 mechanical drawings.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Collector | Main current output terminal; connects to load or supply rail in common-emitter configurations. |
| 2 | Base | Control input; requires current-limited drive to bias transistor into active or saturation region. |
| 3 | Emitter | Current return path; typically grounded or connected to emitter resistor for bias stabilization. |
Key Features
| Feature | Design Value |
|---|---|
| Complementary pairing | Designed as NPN counterpart to BC328 PNP, enabling matched push-pull and differential pair implementations. |
| AF-driver optimization | hFE and fT values support stable small-signal amplification in audio preamp and driver stages up to ~10 MHz. |
| Low VCE(sat) | Guaranteed ≤0.7 V at 500 mA enables efficient switching in relay drivers and LED controls with minimal heat generation. |
| TO-92 compatibility | Standard footprint and lead spacing allow drop-in replacement in legacy through-hole designs using BC337/BC338 family. |
Applications
| Audio Amplifier Stage | Relay Driver Circuit |
|---|---|
Use Scenario: Low-voltage, low-power audio signal amplification in portable radios and intercoms. IC Role / Device Role / Timing Role: NPN transistor configured in common-emitter mode for voltage gain and impedance matching. Use Value: hFE range of 160–400 ensures consistent gain across production lots, while fT = 100 MHz preserves fidelity up to 20 kHz. |
Use Scenario: Driving 12 V electromagnetic relays in HVAC controllers and PLC I/O modules. IC Role / Device Role / Timing Role: Switching transistor in saturated mode to energize relay coil with minimal power loss. Use Value: VCE(sat) ≤ 0.7 V reduces coil power dissipation and enables reliable turn-on with 5 V logic-level base drive. |
| LED Current Control | Signal Level Shifting |
Use Scenario: Constant-current driving of indicator LEDs in instrumentation panels and power supplies. IC Role / Device Role / Timing Role: Linear-mode current source using emitter resistor feedback and base bias network. Use Value: Tight hFE binning (25-class) ensures repeatable LED brightness across units without individual calibration. |
Use Scenario: Translating 3.3 V microcontroller outputs to 5 V logic levels for legacy peripherals. IC Role / Device Role / Timing Role: Active pull-up switch with base driven by MCU GPIO, collector tied to 5 V rail. Use Value: Fast turn-on/off characteristics (fT = 100 MHz) support clean edge transitions up to 1–2 MHz data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC33725TA | VCEO = 45 V (vs. 25 V), same hFE bin and TO-92 package; higher breakdown margin but identical pinout and drive requirements. | Suitable where higher supply voltage tolerance is required, e.g., 24 V industrial sensors; not recommended if VCE never exceeds 15 V due to unnecessary overdesign. | Select BC33725TA only when system voltage exceeds 20 V or transient immunity > 30 V is needed. |
| BC817-25-7-F | SOT-23 surface-mount package, same hFE range (160–400), VCEO = 45 V, IC = 500 mA - lower current rating and different footprint. | Used in space-constrained PCBs where TO-92 is impractical; requires layout revision and requalification of thermal performance. | Choose BC817-25-7-F only for new SMT designs prioritizing board area reduction over legacy compatibility. |
Compared with BC33725TA and BC817-25-7-F, BC33825TA offers optimal balance of 25 V rating, 800 mA capability, and through-hole TO-92 fit for cost-sensitive, medium-current applications where voltage headroom is limited and manual assembly or prototyping is involved.
Availability
BC33825TA is available at Aetrix Electronics and suitable for audio amplifier stages, relay driver circuits, LED current control, and signal level shifting requiring stable component supply and long-term manufacturability.
Supply support for BC33825TA 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 and signal management solutions, with roots in Fairchild Semiconductor's analog and discrete portfolio.
The BC33825TA belongs to the legacy BC337/BC338 NPN transistor family originally developed by Fairchild for general-purpose linear and switching use; it targets cost-effective, high-reliability discrete implementation in consumer, industrial, and automotive-adjacent systems.
FAQ
What is the maximum collector-emitter voltage rating for BC33825TA?
The BC33825TA has a VCEO rating of 25 V, meaning it can safely withstand up to 25 volts between collector and emitter with the base open. This value is confirmed in the Absolute Maximum Ratings table of the BC337/BC338 Rev. 1.5 datasheet and applies specifically to the BC33825TA variant. Exceeding this voltage risks avalanche breakdown and permanent device failure.
Does BC33825TA have a guaranteed hFE range, and how is it binned?
Yes, BC33825TA is hFE-binned to the "25" classification, specifying a DC current gain range of 160–400 at VCE = 1 V and IC = 100 mA. This binning is explicitly documented in the Electrical Characteristics table of the BC337/BC338 datasheet and distinguishes BC33825TA from BC33816TA (100–250) and BC33840TA (250–630).
Is BC33825TA pin-compatible with BC337 variants?
Yes, BC33825TA shares identical TO-92 3-lead pinout (Collector-Base-Emitter) and mechanical dimensions with all BC337 and BC338 variants, including BC33725TA and BC33840TA. However, electrical differences-especially VCEO (25 V vs. 45 V) and VCES (30 V vs. 50 V)-must be validated for each target circuit before substitution.
What is the thermal resistance of BC33825TA, and how does it affect PCB layout?
The BC33825TA has a specified RθJA of 200°C/W on a standard FR-4 PCB (76 mm × 114 mm, 1.57 mm thick) with minimum land pattern. This means junction temperature rises 200°C per watt dissipated; at full 625 mW, ΔT ≈ 125°C above ambient. Layout must ensure adequate copper area around the emitter pad and avoid thermal isolation to prevent exceeding the 150°C maximum junction temperature.
Can BC33825TA be used as a direct replacement for BC328 in complementary circuits?
No-BC33825TA is an NPN transistor and serves as the complement *to* BC328 (a PNP), not a replacement *for* it. In push-pull or differential pair designs, BC33825TA pairs with BC328 to provide symmetrical current sourcing/sinking. Substituting BC33825TA for BC328 would invert circuit polarity and cause functional failure.
BC33825TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 25 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 100mA, 1V
- Power - Max:
- 625 mW
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
BC33825TA FAQ
1.How can I place an order for BC33825TA through Aetrix?
Please submit a Request for Quotation (RFQ) for BC33825TA 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 BC33825TA reliable?
The price and inventory of BC33825TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BC33825TA is usually 5 days.
3.What payment methods are accepted for BC33825TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BC33825TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BC33825TA?
BC33825TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BC33825TA 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 BC33825TA?
For technical support, including BC33825TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BC33825TA requirements.
6.How does Aetrix verify that BC33825TA is sourced from the original manufacturer or authorized distributors?
All BC33825TA 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 BC33825TA meets industry standards.
7.What is the process for return or replacement of BC33825TA?
All BC33825TA units undergo pre-shipment inspection (PSI). If there is an issue with BC33825TA, 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 BC33825TA part is unused and in its original packaging.
Return procedure for BC33825TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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