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Diodes Incorporated DCX68-25-13
- Part No.:
- DCX68-25-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
DCX68-25-13.pdf
- Description:
- TRANS NPN 20V 1A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,277
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Product details
Overview
DCX68-25-13 from Diodes Incorporated is an NPN bipolar junction transistor in SOT89-3L package, rated for 20 V VCEO, 1.0 A continuous collector current, and 1 W power dissipation at 25°C ambient. It delivers hFE = 160–375 at VCE = 1.0 V and IC = 500 mA, with VCE(SAT) ≤ 0.5 V at IC = 1.0 A / IB = 100 mA, and is used in medium-power switching circuits such as DC-DC converter control stages and relay drivers.
For engineers reviewing the DCX68-25-13 datasheet, DCX68-25-13 pinout, DCX68-25-13 application, or DCX68-25-13 equivalent, key selection criteria include verified DC current gain at high IC, low saturation voltage under 1 A load, thermal resistance (RθJA = 125 °C/W), complementary PNP pairing (DCX69), and RoHS-compliant lead-free plating on SOT89-3L terminals.
Technical Context
This discrete NPN transistor employs epitaxial planar die construction for stable gain and low leakage, with breakdown ratings of VCBO = 25 V, VCEO = 20 V, and VEBO = 5.0 V. Its fT = 330 MHz supports medium-frequency switching up to ~100 MHz under specified bias conditions.
Designed for surface-mount automated assembly, it features matte tin–annealed copper leadframe terminations, moisture sensitivity level 1 per J-STD-020D, and UL 94V-0 molded plastic case. Thermal performance assumes mounting on FR-4 PCB per Diodes' AP02001 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 20 V - Maximum safe collector-emitter voltage before avalanche breakdown under open-base condition |
| IC (continuous) | 1.0 A - Continuous DC collector current rating at TA = 25°C with derating above 25°C |
| hFE @ IC = 500 mA | 160–375 - Confirmed DC current gain range enabling reliable base drive sizing for 0.5 A loads |
| VCE(SAT) @ IC = 1.0 A | ≤ 0.5 V - Low saturation voltage ensures <0.5 W conduction loss at full rated current |
| RθJA | 125 °C/W - Junction-to-ambient thermal resistance on standard FR-4 board defines heatsinking requirements |
| fT | 330 MHz - Gain-bandwidth product measured at VCE = 5 V, IC = 100 mA, f = 100 MHz |
Pinout & Package
Package: SOT89-3L - Surface-mount, 3-terminal plastic package with exposed collector tab for thermal conduction; dimensions per Diodes AP02001 (D = 4.50 mm, E = 2.50 mm, H = 4.10 mm, L = 1.05 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Tab/Exposed Pad) | Collector | Electrically and thermally connected to internal die collector; must be soldered to PCB copper pour for thermal management |
| 2 & 4 (Common) | Emitter | Internally tied pins provide low-inductance emitter return path; used together for current handling and thermal relief |
| 3 | Base | Control terminal for forward-biasing the BE junction; requires current-limited drive to achieve target IC |
Key Features
| Feature | Design Value |
|---|---|
| Epitaxial planar die construction | Enables tight parameter distribution, low leakage (ICBO ≤ 0.1 µA), and stable hFE across temperature |
| Complementary PNP pairing (DCX69) | Allows matched push-pull or differential pair design without gain or VBE mismatch penalties |
| Lead-free / RoHS-compliant plating | Matte tin annealed over copper leadframe meets IPC-J-STD-006 and MIL-STD-202 solderability requirements |
| SOT89-3L mechanical robustness | UL 94V-0 flammability rating and 0.072 g weight support high-reliability industrial mounting and reflow profiles |
Applications
| DC-DC Converter Switch | Relay Driver Stage |
|---|---|
Use Scenario: High-side switch in 12 V input buck converter operating at 100–500 kHz. IC Role / Device Role / Timing Role: Medium-power NPN switch controlling energy transfer via inductor; driven by PWM controller output. Use Value: VCE(SAT) ≤ 0.5 V minimizes conduction loss at 1 A peak current; fT = 330 MHz supports clean turn-on/turn-off edges. |
Use Scenario: Driving 24 V, 500 mA coil of industrial control relay from microcontroller GPIO. IC Role / Device Role / Timing Role: Single-transistor interface amplifying logic-level signal to sufficient coil current. Use Value: hFE ≥ 160 at IC = 500 mA enables <3 mA base drive; SOT89 thermal mass sustains repeated actuation. |
| Linear Regulator Pass Element | LED Current Switch |
Use Scenario: Pass transistor in adjustable 5–15 V linear regulator delivering up to 800 mA. IC Role / Device Role / Timing Role: Voltage-controlled current source dissipating variable power based on load and dropout. Use Value: RθJA = 125 °C/W allows ~1.5 W dissipation with 25°C ambient and minimal heatsink; VCEO = 20 V covers input margin. |
Use Scenario: Constant-current switch for high-brightness white LED string (3.2 V × 3) in signage lighting. IC Role / Device Role / Timing Role: On/off current valve controlled by MCU PWM; operates in saturation during ON phase. Use Value: IC = 1.0 A rating supports >700 mA LED current; low VCE(SAT) preserves forward voltage headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BCX68-25 | Identical electrical specs (VCEO = 20 V, IC = 1.0 A, hFE = 160–375), same SOT89-3L package, but active status per Diodes' current portfolio | Direct replacement with documented long-term availability and updated manufacturing controls | Select BCX68-25 when new design-in or BOM refresh is required; avoids obsolete-part procurement risk |
| MJD127G | Higher VCEO = 100 V, lower hFE = 30–120, TO-252 package - larger footprint and higher RθJA (~65 °C/W) | Suitable for higher-voltage flyback snubbers or inductive load suppression where 20 V rating is insufficient | Choose MJD127G only if system requires >25 V blocking capability; otherwise, BCX68-25 offers better gain and thermal fit |
Compared with DCX68-25-13, BCX68-25 provides identical performance with assured supply continuity, while MJD127G trades gain and thermal efficiency for higher voltage tolerance - making BCX68-25 the preferred drop-in upgrade for legacy designs.
Availability
DCX68-25-13 is available at Aetrix Electronics and suitable for medium-power switching, relay driving, and linear regulator pass element applications requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-reference fulfillment.
Supply support for DCX68-25-13 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
The DCX68 series belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive, high-volume industrial and consumer switching applications where reliability, consistency, and RoHS compliance are mandatory.
FAQ
Is DCX68-25-13 still in production?
No - DCX68-25-13 is officially obsolete per Diodes' DS31163 Rev. 5 (May 2021). It is no longer manufactured, but limited legacy stock remains available through authorized channels including Aetrix Electronics. For new designs, Diodes recommends BCX68-25 as the direct functional and form-fit replacement.
What is the correct pinout orientation for SOT89-3L mounting?
With the marking side up and leads pointing downward, Pin 1 is the leftmost lead (exposed collector tab), Pins 2 and 4 are the center and right leads respectively - both internally connected to the emitter. Pin 3 is the base, located between the two emitter leads. The tab must be soldered to a thermal pad per Diodes' AP02001 layout.
Can DCX68-25-13 replace BCX68-25 in existing PCBs?
Yes - DCX68-25-13 and BCX68-25 share identical SOT89-3L mechanical dimensions, pinout, and electrical specifications (VCEO, IC, hFE, VCE(SAT)). They are physically and electrically interchangeable; however, BCX68-25 offers guaranteed long-term supply and updated process controls.
What is the maximum allowable junction temperature during operation?
The absolute maximum junction temperature is +150°C, as specified in the Operating and Storage Temperature Range. At TA = 25°C, the device reaches TJ = 150°C at PD = 1.0 W. Derating is required above 25°C ambient - e.g., at 75°C ambient, max power drops to 0.6 W using RθJA = 125 °C/W.
DCX68-25-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 100mA, 1A
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 160 @ 500mA, 1V
- Power - Max:
- 1 W
- Frequency - Transition:
- 330MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
DCX68-25-13 FAQ
1.How can I place an order for DCX68-25-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for DCX68-25-13 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 DCX68-25-13 reliable?
The price and inventory of DCX68-25-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DCX68-25-13 is usually 5 days.
3.What payment methods are accepted for DCX68-25-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DCX68-25-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DCX68-25-13?
DCX68-25-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DCX68-25-13 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 DCX68-25-13?
For technical support, including DCX68-25-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DCX68-25-13 requirements.
6.How does Aetrix verify that DCX68-25-13 is sourced from the original manufacturer or authorized distributors?
All DCX68-25-13 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 DCX68-25-13 meets industry standards.
7.What is the process for return or replacement of DCX68-25-13?
All DCX68-25-13 units undergo pre-shipment inspection (PSI). If there is an issue with DCX68-25-13, 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 DCX68-25-13 part is unused and in its original packaging.
Return procedure for DCX68-25-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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