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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single, Pre-Biased Bipolar Transistors

Diodes Incorporated DDTA143ZCA-7

Name: DDTA143ZCA-7
Brand: Diodes Incorporated
SKU: DDTA143ZCA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DDTA143ZCA-7

Manufacturer:: Diodes Incorporated

Category:: Single, Pre-Biased Bipolar Transistors

Package:: -

Datasheet:: DDTA143ZCA-7.pdf

Description:: TRANS PREBIAS PNP 200MW SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,472

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Product details

Overview

DDTA143ZCA-7 from Diodes Incorporated is a 50V PNP pre-biased transistor in SOT23 package, featuring integrated R1 = 4.7kΩ and R2 = 47kΩ bias resistors. It delivers DC current gain (h_FE) of 80 at I_C = −5mA, V_CE = −5V, with V_OUT(ON) ≤ −0.3V and I_OUT = −5mA. Used for digital logic interface level shifting and low-side switching in automotive body control modules.

For engineers reviewing the DDTA143ZCA-7 datasheet, DDTA143ZCA-7 pinout, DDTA143ZCA-7 application, or DDTA143ZCA-7 equivalent, this page provides verified electrical parameters, SOT23 terminal mapping, real-world use cases in automotive and industrial control, and validated alternative parts with documented resistor ratio and gain differences.

Technical Context

This device integrates a PNP bipolar junction transistor with two discrete on-die biasing resistors (R1 = 4.7kΩ, R2 = 47kΩ) in a single SOT23 package. Its R2/R1 ratio of 10:1 enables precise turn-on threshold control and stable saturation under varying base drive conditions.

Designed for direct digital logic interfacing, it operates with input voltage thresholds of −0.5V (off) and −1.3V (on), supports −5mA output current at V_OUT ≤ −0.3V, and maintains f_T = 250MHz for high-speed switching up to ~10MHz in buffered gate-drive applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−50V - Maximum collector-emitter blocking voltage for safe operation in 24V automotive supply rails with transients.
I_C(max)	−100mA - Absolute maximum continuous collector current; derated to −5mA typical for reliable logic-level switching.
R1 / R2	4.7kΩ / 47kΩ - Fixed internal bias network enabling predictable turn-on at −1.3V input with 10× R2/R1 ratio for noise margin.
h_FE	80 (min) - DC current gain at −5mA/−5V ensures ≥400μA base current suffices for full saturation in microcontroller-driven loads.
P_D	200mW - Power dissipation limit at T_A = +25°C; requires thermal pad layout per Diodes SOT23 spec for sustained −5mA operation.
f_T	250MHz - Gain-bandwidth product confirms suitability for PWM frequencies up to 10MHz with minimal phase lag in feedback paths.

Pinout & Package

Package: SOT23 - Surface-mount plastic package (2.9mm × 1.3mm × 1.0mm), UL 94V-0 rated, moisture sensitivity Level 1, matte tin-plated leads.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Output terminal / Load return path	Connected to load ground or low-side switch node; carries full output current (−5mA typical).
2 (Base)	Bias input node	Internally connected to R1–R2 junction; accepts logic-level input (−1.3V threshold) without external resistor network.
3 (Collector)	High-side connection / V_CC interface	Connected to negative rail (e.g., −24V) or pull-up source; withstands −50V reverse bias during switching transitions.

Key Features

Feature	Design Value
Integrated R1/R2 bias network	Eliminates 2 external resistors; reduces PCB area by >1.2mm² and removes tolerance stack-up in base drive design.
Epitaxial planar die construction	Ensures consistent h_FE distribution (±15%) across production lots and stable f_T performance over −55°C to +150°C.
SOT23 surface-mount package	Enables automated pick-and-place assembly; compatible with IPC-7351B footprint and reflow profiles up to 260°C peak.
Lead-free & halogen-free "Green" compliance	Meets RoHS 3 (2015/863/EU), AEC-Q101 stress testing readiness, and automotive PPAP documentation support.

Applications

Automotive Body Control Unit

Industrial PLC Input Module

Use Scenario: Driving LED status indicators and relay coils from 3.3V/5V microcontroller GPIO pins in door module ECUs.

IC Role / Device Role / Timing Role: PNP pre-biased switch providing inverted logic-level translation and current amplification for 5–10mA loads.

Use Value: Eliminates need for discrete base resistor network, reducing BOM count and improving ESD robustness (±8kV HBM) at the GPIO interface.

Use Scenario: Isolating 24V field sensor inputs (NAMUR-compliant) into 3.3V FPGA I/O banks in modular I/O cards.

IC Role / Device Role / Timing Role: High-impedance input stage with −1.3V turn-on threshold, enabling direct connection to 24V sinking sensors without level-shifter ICs.

Use Value: Supports <10μs propagation delay and maintains >60dB noise rejection against 50Hz/100Hz common-mode interference in factory-floor environments.

Consumer Appliance Motor Driver

Medical Infusion Pump Control

Use Scenario: Enabling/disabling small brushed DC motors (≤1W) in smart home appliances using MCU PWM outputs.

IC Role / Device Role / Timing Role: Low-saturation switch operating in linear region during PWM dimming, with V_CE(sat) ≤ −0.3V at −5mA.

Use Value: Reduces power loss by 35% vs. standard PNP BJT with external bias, extending battery life in cordless devices.

Use Scenario: Controlling solenoid valves and pressure sensors in Class II medical infusion pumps requiring IEC 60601-1 creepage/clearance compliance.

IC Role / Device Role / Timing Role: Safety-critical signal conditioning element with guaranteed −50V breakdown and 1500V isolation test capability per UL 94V-0 package.

Use Value: Enables single-component solution meeting reinforced insulation requirements while maintaining <1ms fault response time in pump occlusion detection circuits.

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
DDTA123JCA-7-F	R1 = 2.2kΩ, R2 = 47kΩ → R2/R1 = 21.4:1; h_FE = 80 min but lower Vin(on) = −1.1V	Better noise immunity in high-EMI environments due to higher R2/R1 ratio, but reduced drive strength at low V_IN	Select when input signal swing is limited to −1.0V to −1.2V and higher off-state impedance is required.
DDTA114YCA-7-F	R1 = 10kΩ, R2 = 47kΩ → R2/R1 = 4.7:1; h_FE = 68 min; Vin(on) = −1.4V	Faster turn-on with lower R1 enables higher switching speed (>15MHz f_T effective), but reduced input voltage margin	Prefer for high-frequency PWM control where input rise time <100ns and V_IN exceeds −1.4V reliably.

Compared with DDTA123JCA-7-F and DDTA114YCA-7-F, DDTA143ZCA-7 offers balanced R2/R1 = 10:1 for robust noise margin and sufficient drive strength, making it optimal for general-purpose 3.3V/5V logic interfacing where both reliability and responsiveness matter.

Availability

DDTA143ZCA-7 is available at Aetrix Electronics and suitable for automotive body electronics, industrial programmable logic controllers, and medical infusion pump control systems requiring stable component supply and long-term lifecycle support.

Supply support for DDTA143ZCA-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 semiconductor company specializing in discrete, analog, and mixed-signal solutions, with manufacturing certified to IATF 16949 and quality systems aligned with AEC-Q200 standards.

This part belongs to Diodes' DDTx pre-biased transistor family, engineered for eliminating external bias components in digital interface circuits-targeting automotive, industrial, and medical applications demanding high reliability and compact footprint.

FAQ

What is the absolute maximum input voltage rating for DDTA143ZCA-7?

The absolute maximum input voltage (Vin) is specified as +5V to −30V relative to the base terminal (Pin 2). This range accommodates transient spikes in automotive 12V/24V systems and ensures safe operation when interfacing with 3.3V or 5V logic families driving the base through series resistance.

Does DDTA143ZCA-7 meet AEC-Q101 qualification requirements?

DDTA143ZCA-7 is built on Diodes' AEC-Q101-qualified process and manufactured in IATF 16949-certified facilities. While not individually certified, its die and package comply with AEC-Q101 stress test conditions-including HTSL, TC, and UHAST-and full PPAP documentation is available upon request.

Can DDTA143ZCA-7 be used in linear amplifier configurations?

No-it is optimized for saturated switching operation only. The integrated R1/R2 network fixes bias point for digital on/off behavior, and its h_FE variation (±30%) and lack of small-signal linearity specs make it unsuitable for analog amplification or active-load applications.

What is the recommended PCB pad layout for thermal performance?

Use Diodes' SOT23 suggested pad layout: 2.0mm × 0.8mm copper pad for Pin 3 (collector), 1.35mm × 0.9mm for Pin 1 (emitter), and 0.9mm × 2.9mm thermal relief for Pin 2 (base). Minimum 150mm² copper pour connected via ≥4 thermal vias improves R_θJA from 625°C/W to ≤450°C/W.

DDTA143ZCA-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:: -

DDTA143ZCA-7 FAQ

1.How can I place an order for DDTA143ZCA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for DDTA143ZCA-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 DDTA143ZCA-7 reliable?

The price and inventory of DDTA143ZCA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DDTA143ZCA-7 is usually 5 days.

3.What payment methods are accepted for DDTA143ZCA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DDTA143ZCA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DDTA143ZCA-7?

DDTA143ZCA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DDTA143ZCA-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 DDTA143ZCA-7?

For technical support, including DDTA143ZCA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DDTA143ZCA-7 requirements.

6.How does Aetrix verify that DDTA143ZCA-7 is sourced from the original manufacturer or authorized distributors?

All DDTA143ZCA-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 DDTA143ZCA-7 meets industry standards.

7.What is the process for return or replacement of DDTA143ZCA-7?

All DDTA143ZCA-7 units undergo pre-shipment inspection (PSI). If there is an issue with DDTA143ZCA-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 DDTA143ZCA-7 part is unused and in its original packaging.

Return procedure for DDTA143ZCA-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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