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Diodes Incorporated DDTA125TCA-7
- Part No.:
- DDTA125TCA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Single, Pre-Biased Bipolar Transistors
- Package:
- -
- Datasheet:
-
DDTA125TCA-7.pdf
- Description:
- TRANS PREBIAS PNP 200MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,760
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Product details
Overview
DDTA125TCA-7 from Diodes Incorporated is a PNP pre-biased transistor in SOT23 package with single built-in bias resistor R1 = 200 kΩ, hFE = 100–600 at IC = −1 mA, VCE = −5 V, VCEO = −50 V, and PD = 200 mW - used for discrete logic-level switching and level translation in space-constrained consumer and industrial control circuits.
For engineers reviewing the DDTA125TCA-7 datasheet, DDTA125TCA-7 pinout, DDTA125TCA-7 application, or DDTA125TCA-7 equivalent, key selection criteria include verified R1-only biasing topology, guaranteed hFE range under low-current switching conditions, SOT23 thermal derating behavior, and compatibility with 3.3 V/5 V digital interface drive requirements.
Technical Context
This device implements a monolithic PNP bipolar junction transistor with an integrated 200 kΩ base-emitter pull-up resistor (R1 only), eliminating external bias components in simple switching configurations. It operates as a saturated switch with VCE(sat) ≤ −0.3 V at IC/IB = −0.5 mA/−0.05 mA and supports ambient temperatures from −55 °C to +150 °C.
The SOT23 package delivers 625 °C/W junction-to-ambient thermal resistance on FR4 PCBs with minimum pad layout, and its epitaxial planar die construction ensures stable gain and leakage performance across automotive-grade temperature ranges - though this specific part is marked Obsolete and not AEC-Q qualified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −50 V - Maximum allowable collector-emitter voltage before breakdown; defines safe operating range in low-voltage DC switching rails. |
| hFE | 100–600 - Confirmed DC current gain at IC = −1 mA, VCE = −5 V; enables predictable base drive sizing for saturation. |
| R1 | 200 kΩ ±30% - Single integrated base-emitter bias resistor; eliminates need for external pull-up in open-collector or microcontroller-driven loads. |
| VCE(sat) | ≤ −0.3 V at IC/IB = −0.5 mA/−0.05 mA - Low saturation voltage ensures minimal power loss and heat generation in active-switch mode. |
| PD | 200 mW - Maximum power dissipation on standard FR4 board; constrains continuous current to ~100 mA with thermal margin. |
| TJ Range | −55 °C to +150 °C - Full operational junction temperature span; supports deployment in non-automotive industrial environments. |
Pinout & Package
Package: SOT23 - surface-mount plastic package with matte tin-plated leads, 0.008 g mass, UL 94V-0 rating, and moisture sensitivity level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | PNP emitter terminal | Connected to higher potential rail; current flows out of this pin during conduction. |
| Base (B) | Control input node | Internally connected to R1 (200 kΩ) between base and emitter; no external bias required for basic switching. |
| Collector (C) | Output/current sink node | Connected to load and ground return path; sinks current when transistor is biased on. |
Key Features
| Feature | Design Value |
|---|---|
| R1-only internal bias network | 200 kΩ ±30% resistor between base and emitter - reduces BOM count and PCB area in digital interface buffering. |
| Epitaxial planar die construction | Stable hFE and leakage across −55 °C to +150 °C - supports reliable operation in uncontrolled ambient environments. |
| SOT23 footprint compatibility | Standardized 3-pin outline (JEDEC TO-236AB) - enables drop-in replacement with other SOT23 transistors in existing layouts. |
| Lead-free & RoHS 3 compliant | Meets EU Directive 2015/863/EU with <900 ppm Br, <900 ppm Cl, <1000 ppm Sb - satisfies modern environmental compliance requirements. |
Applications
| LED Driver Interface | Microcontroller GPIO Expander |
|---|---|
Use Scenario: Driving indicator LEDs from 3.3 V MCU outputs with limited sink current capability. IC Role / Device Role / Timing Role: PNP switch configured as high-side driver with R1 enabling direct GPIO connection without external pull-up. Use Value: Eliminates two external resistors per channel and reduces layout area by >30% versus discrete BJT + bias solution. |
Use Scenario: Level-shifting and signal inversion between mixed-voltage logic domains (e.g., 1.8 V sensor output to 5 V controller input). IC Role / Device Role / Timing Role: Active-low inverting buffer with defined VCE(sat) and hFE ensuring clean transition thresholds. Use Value: Guarantees sub-0.3 V saturation voltage at 0.5 mA load, preserving noise margin in 5 V TTL-compatible interfaces. |
| Power Rail Enable Switch | Low-Power Sensor Bias Control |
Use Scenario: Enabling/disabling auxiliary 5 V supply rails in battery-powered IoT nodes using ultra-low-quiescent MCU pins. IC Role / Device Role / Timing Role: High-side enable switch controlled by open-drain GPIO; R1 ensures defined off-state. Use Value: Draws <0.5 µA standby current (IEBO-limited) and supports fast turn-off due to absence of base storage delay. |
Use Scenario: Providing stable bias current to analog sensors (e.g., thermistors, photodiodes) requiring <1 µA precision sourcing. IC Role / Device Role / Timing Role: Constant-current source configured via emitter degeneration and fixed R1-based base bias. Use Value: Delivers repeatable 2.5 µA bias (calculated from R1 and VBE) with <±10% variation over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP pre-biased transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DDTA124TCA-7-F | R1 = 22 kΩ (vs. 200 kΩ); hFE same range; otherwise identical SOT23 pinout and ratings | Higher base current draw - suitable for stronger drive but increases MCU pin loading | Select when driving heavier loads (>5 mA) or needing faster switching with reduced base resistance. |
| NSVDDTA125MT1G | Same R1 = 200 kΩ, but AEC-Q101 qualified; slightly higher VCEO = −60 V; same SOT23-3L package | Qualified for automotive temperature cycling and PPAP support - required for Tier-1 production | Choose for new automotive designs where qualification and long-term supply continuity are mandatory. |
Compared with DDTA125TCA-7, DDTA124TCA-7-F offers lower R1 for improved drive strength at the cost of higher static current, while NSVDDTA125MT1G provides identical biasing with automotive qualification and extended voltage margin - making it the functional upgrade path where reliability certification is required.
Availability
DDTA125TCA-7 is available at Aetrix Electronics and suitable for LED driver interface, microcontroller GPIO expansion, and low-power sensor bias control requiring stable component supply and legacy design continuity.
Supply support for DDTA125TCA-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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.
This part belongs to the DDTA R1-Only Series of pre-biased transistors, designed specifically to simplify digital interface circuitry by integrating critical biasing components into standardized SOT23 packages for consumer, industrial, and computing applications.
FAQ
Is DDTA125TCA-7 still in active production?
No - DDTA125TCA-7-F is marked Obsolete in Diodes' official ordering information table. It remains available through authorized distributors' legacy stock and Aetrix Electronics' extended-life inventory program, but no new wafer fabrication or packaging is scheduled. Customers should evaluate DDTA124TCA-7-F or NSVDDTA125MT1G for new designs.
What is the exact pin configuration for DDTA125TCA-7 in SOT23?
DDTA125TCA-7 uses standard SOT23-3L pinout: Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector - confirmed by Diodes' top-view schematic in DS30335 Rev. 8-2, page 2. This matches JEDEC TO-236AB mechanical standard and is compatible with automated placement equipment calibrated for SOT23 footprints.
Can DDTA125TCA-7 replace a standard PNP BJT like MMBT3906?
Yes, with caveats: DDTA125TCA-7 integrates R1 = 200 kΩ between base and emitter, so it replaces both the transistor and one external resistor. It cannot substitute for MMBT3906 in circuits requiring adjustable or dual-resistor (R1+R2) biasing. Its hFE range (100–600) overlaps MMBT3906's (100–300), but saturation voltage is specified under different test conditions (−0.5 mA/−0.05 mA vs. −10 mA/−1 mA).
Does DDTA125TCA-7 meet AEC-Q200 stress testing requirements?
No - the datasheet explicitly states that AEC-Q qualification applies only to parts designated for automotive use "with specific change control", and DDTA125TCA-7-F is not listed among AEC-Q200-qualified variants. For automotive applications, Diodes recommends NSVDDTA125MT1G, which carries full AEC-Q101 qualification and PPAP capability.
DDTA125TCA-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:
- -
DDTA125TCA-7 FAQ
1.How can I place an order for DDTA125TCA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for DDTA125TCA-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 DDTA125TCA-7 reliable?
The price and inventory of DDTA125TCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA125TCA-7 is usually 5 days.
3.What payment methods are accepted for DDTA125TCA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA125TCA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DDTA125TCA-7?
DDTA125TCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DDTA125TCA-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 DDTA125TCA-7?
For technical support, including DDTA125TCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA125TCA-7 requirements.
6.How does Aetrix verify that DDTA125TCA-7 is sourced from the original manufacturer or authorized distributors?
All DDTA125TCA-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 DDTA125TCA-7 meets industry standards.
7.What is the process for return or replacement of DDTA125TCA-7?
All DDTA125TCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA125TCA-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 DDTA125TCA-7 part is unused and in its original packaging.
Return procedure for DDTA125TCA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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