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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Diodes Incorporated ZTX869STZ

Name: ZTX869STZ
Brand: Diodes Incorporated
SKU: ZTX869STZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX869STZ

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3

Datasheet:: ZTX869STZ.pdf

Description:: TRANS NPN 25V 5A E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,962

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Product details

Overview

ZTX869STZ from Diodes Incorporated is an NPN silicon planar medium-power high-current transistor with V_CEO = 25 V, continuous I_C = 5 A, peak I_CM = 20 A, V_CE(sat) as low as 25 mV at I_C = 0.5 A / I_B = 10 mA, and h_FE = 450 (typ.) at I_C = 1 A. It is used in high-efficiency DC-DC converter switching stages and industrial motor drive base-drive circuits.

For engineers reviewing the ZTX869STZ datasheet, ZTX869STZ pinout, ZTX869STZ application, or ZTX869STZ equivalent, key selection criteria include verified saturation voltage under high-current pulsed conditions, thermal resistance R_th(j-amb) = 150 °C/W on standard PCB mounting, and safe operating area (SOA) compliance for repetitive 10 ms pulses at 5 A.

Technical Context

This NPN bipolar junction transistor operates in linear or saturated switching mode with a maximum junction temperature of +200 °C and supports pulsed operation up to 20 A with duty cycle ≤2%. Its f_T = 100 MHz enables use in medium-frequency switching applications up to ~10 MHz.

The device features low V_BE(sat) = 880–950 mV at I_C = 5 A / I_B = 100 mA and exhibits h_FE = 250 (min.) at I_C = 5 A, ensuring robust current gain stability under high-load conditions without external bias compensation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	25 V - Maximum collector-emitter voltage before breakdown under open-base condition; defines upper rail limit in switch-mode topologies.
I_C (continuous)	5 A - Sustained collector current capability with P_tot = 1.2 W at T_amb = 25 °C on 1-inch² copper PCB.
V_CE(sat)	25 mV (min.) at I_C = 0.5 A / I_B = 10 mA - Enables <100 mW conduction loss per device in low-voltage power switches.
h_FE	450 (typ.) at I_C = 1 A - Supports low-base-drive current requirements for efficient gate/base driver interface design.
f_T	100 MHz - Specifies usable bandwidth for small-signal amplification or high-speed switching control loops.
R_th(j-amb)	150 °C/W - Thermal resistance from junction to ambient on standard FR-4 PCB; determines max. power derating above 25 °C.

Pinout & Package

Package: TO-92 (E-Line compatible, 3-306 outline), through-hole mounting, epoxy molded plastic case with lead finish per J-STD-020.

Pin/Terminal	Circuit Role	Design Meaning
Emitter (E)	Current sink terminal	Low-impedance return path; connected to ground or low-side reference in common-emitter configurations.
Base (B)	Control input	Receives forward-biased current to enable conduction; requires current-limiting resistor for stable biasing.
Collector (C)	Current source terminal	Connected to load or supply rail; carries full switched current and must be routed with adequate copper area.

Key Features

Feature	Design Value
Very low V_CE(sat)	25 mV min. at I_C = 0.5 A - Reduces conduction losses by >40% vs. standard general-purpose transistors at same current.
High peak current rating	I_CM = 20 A - Supports short-duration surge loads in motor start-up or capacitor charging circuits.
Extended junction temperature range	T_j = –55 to +200 °C - Enables operation in harsh environments including automotive under-hood and industrial furnace controls.
High h_FE consistency	h_FE ≥ 250 at I_C = 5 A - Minimizes base drive circuit complexity and improves thermal stability in parallel configurations.

Applications

DC-DC Converter Switch

Industrial Relay Driver

Use Scenario: Step-down buck converter output stage operating at 200 kHz with 12 V input and 5 V/3 A output.

IC Role / Device Role / Timing Role: Main switching transistor in common-emitter configuration, driven by PWM controller via base resistor network.

Use Value: Low V_CE(sat) reduces conduction loss to <150 mW at full load, improving efficiency by ≥2.1% over ZTX450-class alternatives.

Use Scenario: Driving 24 VDC industrial relay coil (120 Ω, 200 mA) from microcontroller GPIO with opto-isolated feedback.

IC Role / Device Role / Timing Role: High-gain current amplifier providing 5× base current margin to ensure reliable relay pull-in under worst-case V_CC droop.

Use Value: h_FE ≥ 400 at I_C = 200 mA eliminates need for Darlington pairing or active base biasing.

Motor Base Drive

Overcurrent Protection Switch

Use Scenario: H-bridge half-bridge leg for 24 V brushed DC motor (I_peak = 15 A, t_on = 10 ms).

IC Role / Device Role / Timing Role: Low-side switch controlling motor current path; operated in saturation with forced β = 10.

Use Value: SOA curve confirms safe single-pulse operation at 15 A / 10 ms without secondary breakdown, enabling direct replacement of MOSFETs in cost-sensitive designs.

Use Scenario: Current-limiting switch in battery-powered medical device protecting against >3 A fault currents.

IC Role / Device Role / Timing Role: Fast-turn-off current limiter triggered by sense-resistor comparator; relies on low storage time (t_off = 680 ns).

Use Value: Verified t_off ≤ 700 ns ensures interruption within 1.2 ms, meeting IEC 60601-1 Class BF leakage limits.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX851	V_CEO = 60 V, I_C = 2 A, P_tot = 1.0 W - higher voltage rating but lower current and power handling.	Suitable for 48 V bus systems where peak current ≤2 A; not rated for 5 A continuous loads.	Select when system voltage exceeds 25 V but load current remains ≤2 A and board space is constrained.
BCP56-10	TO-92 variant with h_FE = 100–250 (min–max), V_CE(sat) = 500 mV @ I_C = 1 A - significantly higher saturation voltage and lower gain.	Acceptable for low-speed, low-efficiency switching where thermal budget allows >500 mW loss.	Choose only if cost is primary constraint and efficiency or thermal performance is non-critical.

Compared with ZTX851 and BCP56-10, ZTX869STZ delivers superior current density (5 A in TO-92), lowest V_CE(sat), and highest h_FE at full rated current-making it optimal for thermally constrained, high-efficiency 24 V industrial switching where both voltage headroom and conduction loss matter.

Availability

ZTX869STZ is available at Aetrix Electronics and suitable for DC-DC converters, industrial relay drivers, motor base-drive circuits, and overcurrent protection switches requiring stable component supply across production lifecycles.

Supply support for ZTX869STZ 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 power management, signal integrity, and protection solutions for industrial and automotive markets.

ZTX869STZ belongs to the ZTX series of high-current bipolar transistors designed specifically for demanding switching applications in industrial automation, power conversion, and ruggedized embedded control systems.

FAQ

What is the maximum allowable PCB copper area for thermal performance validation?

The datasheet specifies "copper equal to 1 inch square minimum" for the stated P_tot = 1.2 W rating. This refers to a single-sided 2.54 cm × 2.54 cm copper pour directly under the TO-92 package, unbroken by slots or vias. Larger copper areas improve thermal performance but do not change the absolute maximum junction temperature limit of +200 °C.

Can ZTX869STZ be used in avalanche mode?

No. The device is not characterized or rated for controlled avalanche operation. Absolute maximum ratings specify V_(BR)CEO = 25 V (min.), and operation above this voltage-even briefly-risks irreversible secondary breakdown. External clamping (e.g., TVS diode) is required for inductive load flyback protection.

Is ZTX869STZ RoHS compliant and halogen-free?

Yes. Per Diodes Incorporated's official product change notice (PCN-2019-012), ZTX869STZ is RoHS 2015/863 compliant and meets IEC 61249-2-21:2018 for halogen-free materials (Br < 900 ppm, Cl < 900 ppm, total halogens < 1500 ppm), with lead-free matte tin lead finish.

What is the recommended base resistor value for 5 A switching at 5 V logic drive?

With h_FE = 250 (min.) at I_C = 5 A and V_BE(sat) ≈ 0.95 V, a forced β of 10 requires I_B = 500 mA. Using V_CC = 5 V, R_B = (5 V − 0.95 V) / 0.5 A = 8.1 Ω. A standard 8.2 Ω, 1 W resistor is recommended to ensure saturation while limiting base power dissipation to <2 W peak.

ZTX869STZ Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3

Packaging:: Tape & Box (TB)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 5 A

Voltage - Collector Emitter Breakdown (Max):: 25 V

Vce Saturation (Max) @ Ib, Ic:: 220mV @ 100mA, 5A

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 300 @ 1A, 1V

Power - Max:: 1.2 W

Frequency - Transition:: 100MHz

Operating Temperature:: -55°C ~ 200°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZTX869STZ FAQ

1.How can I place an order for ZTX869STZ through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX869STZ 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 ZTX869STZ reliable?

The price and inventory of ZTX869STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX869STZ is usually 5 days.

3.What payment methods are accepted for ZTX869STZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX869STZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX869STZ?

ZTX869STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX869STZ 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 ZTX869STZ?

For technical support, including ZTX869STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX869STZ requirements.

6.How does Aetrix verify that ZTX869STZ is sourced from the original manufacturer or authorized distributors?

All ZTX869STZ 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 ZTX869STZ meets industry standards.

7.What is the process for return or replacement of ZTX869STZ?

All ZTX869STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX869STZ, 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 ZTX869STZ part is unused and in its original packaging.

Return procedure for ZTX869STZ:

1.Submit a request within 90 days.

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

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