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Diodes Incorporated BCX19TC
- Part No.:
- BCX19TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BCX19TC.pdf
- Description:
- TRANS NPN 45V 0.5A SOT-23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,715
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Product details
Overview
BCX19TC from Diodes Incorporated is an NPN silicon planar medium-power transistor in SOT23 package, rated for VCEO = 45 V, IC = 500 mA, and PTOT = 330 mW at Tamb = 25°C. It delivers hFE = 100–600 (at IC = 100 mA), fT = 200 MHz, and VCE(sat) = 620 mV @ IC = 500 mA / IB = 50 mA, used in low-voltage switching and linear amplification stages of industrial control interfaces.
For engineers reviewing the BCX19TC datasheet, BCX19TC pinout, BCX19TC application, or BCX19TC equivalent, key selection criteria include verified DC current gain spread across operating currents, pulsed saturation voltage under defined drive conditions, thermal derating behavior above 25°C ambient, and complementary pairing with BCX17 for push-pull configurations.
Technical Context
This NPN transistor employs a planar epitaxial structure optimized for medium-power switching and analog amplification up to 200 MHz. Its design supports stable hFE performance across IC = 100–500 mA with VCE = 1 V bias, and maintains low Cobo = 5.0 pF at VCB = 10 V, enabling predictable high-frequency response in emitter-follower and common-emitter topologies.
Thermal operation is specified from –55°C to +150°C junction temperature, with power dissipation linearly derated above 25°C ambient. The device uses standard SOT23 leadframe metallization and epoxy molding compound compliant with JEDEC MO-178, supporting reflow soldering per IPC/JEDEC J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 45 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines safe DC/peak swing headroom in switching rails. |
| IC (continuous) | 500 mA - Continuous collector current limit at 25°C ambient; sets maximum steady-state load drive capability. |
| PTOT | 330 mW - Total power dissipation at Tamb = 25°C; determines thermal margin before derating begins. |
| hFE (min–max) | 100–600 - DC current gain range at IC = 100 mA / VCE = 1 V; impacts base drive sizing and loop stability in amplifier designs. |
| fT | 200 MHz - Transition frequency at IC = 10 mA / VCE = 5 V; indicates usable bandwidth for small-signal amplification. |
| VCE(sat) | 620 mV @ IC = 500 mA, IB = 50 mA - Saturation voltage under defined overdrive; determines conduction loss in switch-mode operation. |
| Cobo | 5.0 pF @ VCB = 10 V, f = 1 MHz - Output capacitance; affects high-frequency gain roll-off and switching speed in tuned circuits. |
Pinout & Package
SOT23 plastic surface-mount package with gull-wing leads, JEDEC TO-236AB outline, 1.3 mm × 2.9 mm footprint, 1.1 mm height, and standard pin 1–2–3 configuration (Emitter–Base–Collector).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Reference node for bias network; connects to ground or low-impedance return path in common-emitter switches. |
| 2 (Base) | Control input | Receives current-limited drive signal; requires series resistor to limit IB ≤ 100 mA continuous per absolute rating. |
| 3 (Collector) | Current source terminal | Drives load toward positive rail; must remain ≤ 45 V below supply to avoid avalanche breakdown. |
Key Features
| Feature | Design Value |
|---|---|
| Medium-power SOT23 packaging | Enables compact board layout while supporting 500 mA continuous current and 330 mW dissipation without heatsinking. |
| Wide hFE range (100–600) | Allows flexible base drive design across production lots and operating points without gain compensation circuitry. |
| 200 MHz fT | Supports audio-frequency amplification and RF pre-driver stages up to 35 MHz fundamental with adequate gain margin. |
| Low VCE(sat) (620 mV) | Reduces conduction loss in 3.3 V/5 V logic-level switching applications, improving efficiency in battery-powered interfaces. |
| Complementary pair with BCX17 | Enables matched push-pull output stages with symmetrical turn-on/turn-off characteristics in Class-B amplifiers. |
Applications
| Industrial Sensor Interface | LED Driver Stage |
|---|---|
Use Scenario: Amplifying low-level signals from RTD or thermistor bridges into ADC input ranges. IC Role / Device Role / Timing Role: NPN emitter-follower buffer providing impedance transformation and DC-coupled gain stability. Use Value: hFE ≥ 100 ensures minimal base current loading on precision resistive networks, preserving measurement accuracy. | Use Scenario: Switching 20–100 mA LED strings in programmable indicator panels. IC Role / Device Role / Timing Role: Low-side constant-current switch controlled by microcontroller GPIO. Use Value: VCE(sat) ≤ 620 mV minimizes voltage drop across transistor, maximizing forward voltage available to LED string. |
| DC Motor Control (Small) | Audio Pre-amplifier Stage |
Use Scenario: Driving 12 V, <100 mA brushed DC motors in HVAC damper actuators. IC Role / Device Role / Timing Role: Single-transistor H-bridge half-bridge element with flyback diode protection. Use Value: IC = 500 mA and VCEO = 45 V provide 2× safety margin against inductive kickback during PWM commutation. | Use Scenario: First-stage voltage amplification in portable microphone preamps. IC Role / Device Role / Timing Role: Common-emitter small-signal amplifier biased at IC = 10 mA for low-noise operation. Use Value: fT = 200 MHz ensures flat gain response across 20 Hz–20 kHz with margin for harmonic content. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC817-40 | Higher hFE min = 250, lower VCE(sat) = 500 mV @ IC/IB = 500/50 mA, same SOT23 package. | Better suited for low-loss switching where tight gain tolerance is less critical than saturation efficiency. | Select when minimizing conduction loss outweighs need for wide hFE spread in feedback-stabilized designs. |
| MMBT3904 | Lower IC = 200 mA, higher fT = 300 MHz, same VCEO = 40 V, identical pinout. | Optimized for high-frequency signal amplification rather than medium-current switching. | Prefer for RF front-end or broadband analog stages where gain-bandwidth product dominates over current handling. |
Compared with BCX19TC, BC817-40 offers superior saturation efficiency but narrower hFE range, while MMBT3904 trades current capacity for higher frequency response-making BCX19TC the balanced choice for general-purpose industrial switching and amplification where both 500 mA drive and 200 MHz bandwidth are required.
Availability
BCX19TC is available at Aetrix Electronics and suitable for industrial sensor interfaces, LED driver stages, small DC motor control, and audio pre-amplifier circuits requiring stable component supply and consistent parametric performance across production batches.
Supply support for BCX19TC 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for industrial, computing, and consumer applications.
The BCX19TC belongs to Diodes' legacy bipolar transistor portfolio designed for cost-sensitive, medium-power analog and switching functions in space-constrained PCB layouts.
FAQ
What is the maximum allowable base current for continuous operation?
The absolute maximum continuous base current (IB) is 100 mA at Tamb = 25°C, per the datasheet's Absolute Maximum Ratings table. Exceeding this value risks metallization electromigration and long-term parameter drift. For reliable operation, design base drive to stay ≤ 80 mA with appropriate thermal margin, especially above 25°C ambient.
Can BCX19TC be used in linear amplifier mode with VCE = 12 V and IC = 200 mA?
Yes-this operating point falls within the Safe Operating Area (SOA) at 25°C: VCE × IC = 2.4 W exceeds PTOT = 330 mW, but SOA curves (not provided in this excerpt) confirm pulsed or short-duration linear use is feasible. For continuous operation, derate power using the specified thermal resistance and ambient temperature limits.
Is BCX19TC pin-compatible with BCX19 or BCX19R?
Yes-BCX19TC, BCX19, and BCX19R share identical SOT23 pinout (Emitter–Base–Collector, pin 1–2–3) and mechanical dimensions. The suffix denotes tape-and-reel packaging (TC) and date-code variants (R), not functional or electrical differences. All three part numbers are electrically interchangeable in circuit design.
Does BCX19TC require external ESD protection in handheld device designs?
While BCX19TC has no built-in ESD protection diodes, its VEBO = 5 V and VCEO = 45 V provide inherent robustness against typical handling events. For IEC 61000-4-2 Level 2 (4 kV contact) environments, no additional protection is required; however, direct PCB-level ESD strikes near pins may exceed VEBO, so layout isolation and guarding are recommended.
BCX19TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 45 V
- Vce Saturation (Max) @ Ib, Ic:
- 620mV @ 50mA, 500mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 100mA, 1V
- Power - Max:
- 330 mW
- Frequency - Transition:
- 200MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
BCX19TC FAQ
1.How can I place an order for BCX19TC through Aetrix?
Please submit a Request for Quotation (RFQ) for BCX19TC 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 BCX19TC reliable?
The price and inventory of BCX19TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BCX19TC is usually 5 days.
3.What payment methods are accepted for BCX19TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BCX19TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BCX19TC?
BCX19TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BCX19TC 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 BCX19TC?
For technical support, including BCX19TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BCX19TC requirements.
6.How does Aetrix verify that BCX19TC is sourced from the original manufacturer or authorized distributors?
All BCX19TC 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 BCX19TC meets industry standards.
7.What is the process for return or replacement of BCX19TC?
All BCX19TC units undergo pre-shipment inspection (PSI). If there is an issue with BCX19TC, 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 BCX19TC part is unused and in its original packaging.
Return procedure for BCX19TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BCX19TC 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
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