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Diodes Incorporated DDTC125TCA-7
- Part No.:
- DDTC125TCA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
DDTC125TCA-7.pdf
- Description:
- TRANS PREBIAS NPN 200MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
DDTC125TCA-7 from Diodes Incorporated is an NPN pre-biased transistor in SOT23 package with a single built-in bias resistor R1 = 200 kΩ, VCEO = 50 V, IC(max) = 100 mA, and hFE = 100–600 at IC = 1 mA. It serves as a compact, lead-free switching element in low-power digital interface and level-shifting circuits.
For engineers reviewing the DDTC125TCA-7 datasheet, DDTC125TCA-7 pinout, DDTC125TCA-7 application, or DDTC125TCA-7 equivalent, key selection considerations include its R1-only biasing topology, SOT23 thermal performance (RθJA = 625 °C/W), guaranteed hFE range, and obsolescence status affecting long-term design continuity.
Technical Context
This device implements a monolithic NPN transistor with an integrated 200 kΩ base bias resistor (R1 only, no R2), eliminating external bias components for simple on/off control. Its epitaxial planar die construction ensures stable gain and low leakage across -55°C to +150°C operating range.
Designed for discrete logic-level interfacing, it operates with VCE(sat) ≤ 0.3 V at IC/IB = 0.5 mA/0.05 mA and supports fast switching via fT = 250 MHz (measured at VCE = 10 V, IE = −5 mA), making it suitable for 1–10 MHz digital signal routing where space-constrained biasing is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 50 V - Maximum collector-emitter voltage before breakdown; defines safe operating voltage headroom in 3.3 V/5 V logic interfaces. |
| IC(max) | 100 mA - Continuous collector current limit; supports driving small relays, LEDs, or gate inputs without external current limiting. |
| R1 | 200 kΩ ±30% - Single integrated base bias resistor; enables direct microcontroller GPIO connection without external pull-up/pull-down. |
| hFE | 100–600 @ IC = 1 mA - DC current gain range; ensures reliable saturation under varying process/temp conditions in low-current switching. |
| VCE(sat) | ≤ 0.3 V @ IC/IB = 0.5 mA/0.05 mA - Low saturation voltage minimizes power loss and heat generation in battery-powered sensor nodes. |
| RθJA | 625 °C/W - Junction-to-ambient thermal resistance on FR4; requires minimal copper area for thermal management in compact PCB layouts. |
Pinout & Package
Package: SOT23 - Surface-mount plastic package with matte tin-plated leads, moisture sensitivity level 1, weight ≈ 0.008 g, UL 94V-0 rated molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Emitter terminal | Reference node for current flow; connected to ground or low-side return path in common-emitter switch configuration. |
| 2 (Base) | Base input with R1 | Internally connected to 200 kΩ resistor; accepts direct logic-level drive (e.g., 3.3 V MCU output) without external bias network. |
| 3 (Collector) | Collector output | Switched high-side output node; connects to load (e.g., LED anode, relay coil) referenced to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| R1-only biasing | Single 200 kΩ internal base resistor eliminates need for external bias components, reducing BOM count and layout area by ≥2 parts per channel. |
| AEC-Q101 alignment | Shares platform with automotive-qualified variants (e.g., DDTC143TCAQ); same die construction and process controls support industrial reliability requirements. |
| Green compliance | Halogen- and antimony-free (<900 ppm Br/Cl, <1000 ppm Sb), fully RoHS 3 compliant - meets environmental mandates for EU, China, and Japan markets. |
| SOT23 footprint | Standardized 3-pin SOT23 outline (2.9 mm × 1.3 mm × 1.0 mm) enables drop-in replacement with other pre-biased transistors in existing layouts. |
Applications
| IoT Sensor Interface | Industrial PLC Input |
|---|---|
|
Use Scenario: Level-shifting between 1.8 V microcontroller GPIO and 5 V industrial sensor outputs. IC Role / Device Role / Timing Role: NPN switch enabling bidirectional signal translation with minimal propagation delay. Use Value: Eliminates discrete resistor networks while maintaining <0.3 V VCE(sat) to preserve noise margin in noisy factory environments. |
Use Scenario: Isolating 24 V DC field signals into 3.3 V FPGA I/O banks. IC Role / Device Role / Timing Role: High-impedance input stage with 200 kΩ R1 providing defined logic threshold and ESD robustness. Use Value: Reduces component count per channel by one resistor pair, improving board density in multi-channel I/O modules. |
| Consumer Remote Control | Medical Wearable Power Enable |
|
Use Scenario: Driving IR LED arrays from low-power ARM Cortex-M0+ outputs. IC Role / Device Role / Timing Role: Current-switching element with guaranteed hFE ≥ 100 at 0.5 mA base drive. Use Value: Ensures consistent LED brightness across battery voltage range (2.0–3.6 V) without recalibration. |
Use Scenario: Enabling/disabling PMIC rails in ultra-low-power ECG patch devices. IC Role / Device Role / Timing Role: Low-leakage (ICBO ≤ 0.5 μA) enable switch minimizing standby current. Use Value: Contributes <0.1 μA typical added leakage to system sleep current, extending battery life beyond 7 days. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTC124TCA-7-F | R1 = 22 kΩ (vs. 200 kΩ); hFE min = 60 @ IC = 5 mA | Optimized for higher drive currents (>5 mA), not low-IB logic-level operation | Select when base drive capability exceeds 0.25 mA and faster turn-on is required. |
| DDTC115TCA-7-F | R1 = 100 kΩ (vs. 200 kΩ); hFE min = 100 @ IC = 0.5 mA | Narrower gain range (100–400 vs. 100–600); tighter R1 tolerance not specified | Prefer for designs requiring lower base current sensitivity and moderate gain stability. |
Compared with DDTC124TCA-7-F and DDTC115TCA-7-F, DDTC125TCA-7 offers highest R1 value for lowest base current demand and widest hFE range-critical for margin-critical, low-power logic interfacing where drive strength varies across temperature and supply.
Availability
DDTC125TCA-7 is available at Aetrix Electronics and suitable for IoT sensor interface, industrial PLC input, and consumer remote control applications requiring stable component supply despite its obsolete status.
Supply support for DDTC125TCA-7 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, energy-efficient components for industrial, computing, and consumer markets.
This part belongs to the DDTC (R1-only series) CA family-designed specifically for space-constrained, low-power digital switching applications where simplified biasing and green compliance are mandatory.
FAQ
Is DDTC125TCA-7 still in active production?
No. Per Diodes' ordering information table, DDTC125TCA-7-F is marked "Obsolete". Aetrix Electronics maintains limited legacy stock with full traceability and provides last-time-buy support, including extended warranty and documentation packages for ongoing production runs.
Can DDTC125TCA-7 replace DDTC124TCA-7-F in existing designs?
Not directly. DDTC125TCA-7 has R1 = 200 kΩ versus 22 kΩ in DDTC124TCA-7-F, resulting in ~9× lower base current. Substitution would cause insufficient drive in circuits relying on higher IB, leading to incomplete saturation and elevated VCE(sat).
What is the maximum operating temperature for continuous use?
The device supports continuous operation from –55°C to +150°C junction temperature. At ambient temperatures above 85°C, derating applies: power dissipation must be reduced linearly from 200 mW at 25°C to zero at 150°C, per the published derating curve.
Does this part meet automotive qualification standards?
DDTC125TCA-7 itself is not AEC-Q101 qualified. However, the identical die and process are used in the automotive-grade DDTC143TCAQ series, which is AEC-Q101 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities.
DDTC125TCA-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Transistor Type:
- -
- Current - Collector (Ic) (Max):
- -
- Voltage - Collector Emitter Breakdown (Max):
- -
- Resistor - Base (R1):
- -
- Resistor - Emitter Base (R2):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- -
- Vce Saturation (Max) @ Ib, Ic:
- -
- Current - Collector Cutoff (Max):
- -
- Frequency - Transition:
- -
- Power - Max:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
DDTC125TCA-7 FAQ
1.How can I place an order for DDTC125TCA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTC125TCA-7 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 DDTC125TCA-7 reliable?
The price and inventory of DDTC125TCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTC125TCA-7 is usually 5 days.
3.What payment methods are accepted for DDTC125TCA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTC125TCA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTC125TCA-7?
DDTC125TCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTC125TCA-7 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 DDTC125TCA-7?
For technical support, including DDTC125TCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTC125TCA-7 requirements.
6.How does Aetrix verify that DDTC125TCA-7 is sourced from the original manufacturer or authorized distributors?
All DDTC125TCA-7 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 DDTC125TCA-7 meets industry standards.
7.What is the process for return or replacement of DDTC125TCA-7?
All DDTC125TCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTC125TCA-7, 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 DDTC125TCA-7 part is unused and in its original packaging.
Return procedure for DDTC125TCA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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