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

Diodes Incorporated ZTX958

Name: ZTX958
Brand: Diodes Incorporated
SKU: ZTX958
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZTX958

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

Package:: E-Line-3

Datasheet:: ZTX958.pdf

Description:: TRANS PNP 400V 0.5A E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,129

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Product details

Overview

ZTX958 from Zetex Semiconductors (now Diodes Incorporated) is a PNP silicon planar medium-power high-current transistor designed for linear and switching applications in industrial power supplies, relay drivers, and motor control stages. It delivers −0.5 A continuous collector current, −1.5 A peak pulse current, and exhibits V_CE(sat) as low as −100 mV at I_C = −10 mA / I_B = −1 mA, enabling efficient low-voltage saturation in high-side switch configurations.

For engineers reviewing the ZTX958 datasheet, ZTX958 pinout, ZTX958 application, or ZTX958 equivalent, key selection criteria include its −400 V V_CEO rating, 100–300 h_FE gain range across 10 mA–1 A, TO-92-compatible E-Line package thermal performance (R_th(j-amb) = 150 °C/W), and verified operation up to +200 °C junction temperature.

Technical Context

The ZTX958 operates as a medium-power PNP bipolar junction transistor with fixed-emitter biasing capability and robust avalanche-rated breakdown (V_(BR)CEO = −400 V min). Its gain remains stable across wide current ranges (h_FE = 100 @ I_C = −10 mA; 200 @ −500 mA; 10 @ −1 A), supporting both analog amplification and saturated switching.

Thermal design is enabled by its 1.2 W P_tot at T_amb = 25°C and transient thermal impedance curves validated for pulsed operation (pulse width ≤ 300 µs, duty cycle ≤ 2%). The device features low V_BE(sat) (−790 mV typ.) and fast switching (t_on = 104 ns, t_off = 2400 ns), suitable for moderate-frequency (< 100 kHz) power control.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−400 V minimum - supports high-voltage DC bus switching up to 400 V in PNP high-side configurations
I_C (continuous)	−0.5 A - enables reliable operation in 500 mA load driver circuits without forced cooling
V_CE(sat)	−100 mV max @ I_C = −10 mA / I_B = −1 mA - minimizes conduction loss in low-dropout linear regulators or logic-level interface switches
h_FE	100–300 - provides predictable base drive requirements across 10 mA–1 A output current range
f_T	85 MHz - sufficient for audio-frequency amplification and sub-100 kHz PWM switching
R_th(j-amb)	150 °C/W - defines PCB copper area requirement (≥1 in²) for thermal management at full power
T_j range	−55°C to +200°C - qualified for under-hood automotive, industrial furnace, and high-reliability embedded environments

Pinout & Package

Package: TO-92-compatible E-Line (3-lead, plastic, through-hole), pin assignment confirmed per Zetex ZTX958 datasheet Issue 3 (June 1994): Emitter (E), Base (B), Collector (C) - left-to-right when viewing flat side with leads down.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current source terminal for PNP operation	Connected to positive rail in high-side switch; requires external current-limiting resistor when used in linear mode
B (Base)	Control input for minority-carrier injection	Driven negative relative to emitter; typical I_B/I_C ratio = 5–20 for saturation
C (Collector)	Output current sink terminal	Connected to load return path; must withstand −400 V reverse voltage during inductive flyback

Key Features

Feature	Design Value
Low V_CE(sat) at high current	−150 mV max @ I_C = −100 mA / I_B = −10 mA - reduces heat generation in 100 mA load switching
High V_(BR)CEO rating	−400 V minimum - eliminates need for snubbers in 300 V DC supply switching
Wide operating temperature range	−55°C to +200°C - supports deployment in uncooled industrial enclosures and engine compartments
SPICE model availability	Validated behavioral model included in Zetex library - enables accurate transient simulation of switching waveforms and thermal stress
Gain stability vs. current	h_FE ≥ 100 up to I_C = −1 A - ensures consistent base drive sizing across full load range

Applications

Industrial Power Supply

Relay Driver Circuit

Use Scenario: High-side switch controlling 24–48 V DC solenoid loads in programmable logic controller (PLC) output modules.

IC Role / Device Role / Timing Role: PNP transistor configured as saturated switch, driven by microcontroller GPIO via base resistor.

Use Value: −400 V V_CEO safely clamps inductive kickback; −150 mV V_CE(sat) limits power dissipation to < 150 mW at 1 A load.

Use Scenario: Driving 12 V/500 mA electromagnetic relays in HVAC control panels with ambient temperatures up to +85°C.

IC Role / Device Role / Timing Role: Medium-power PNP switch providing galvanic isolation between MCU and relay coil.

Use Value: Stable h_FE ≥ 200 at I_C = −500 mA ensures reliable turn-on with minimal base drive current.

Motor Speed Controller

Linear Regulator Pass Element

Use Scenario: PWM-controlled 24 V brushed DC motor stage in battery-powered industrial tools.

IC Role / Device Role / Timing Role: High-current PNP switch in low-side configuration with freewheeling diode.

Use Value: 85 MHz f_T and 104 ns t_on support clean 20 kHz PWM edges; −1.5 A I_CM handles motor stall currents.

Use Scenario: Pass transistor in adjustable 5–15 V linear regulator supplying analog sensor circuitry.

IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output via feedback loop.

Use Value: Low V_CE(sat) and high h_FE minimize dropout voltage and improve regulation accuracy at 300 mA load.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZTX951	Lower V_CEO (−200 V), same TO-92 package, h_FE = 100–250	Not suitable for >200 V bus applications; reduced safe operating area at high voltage	Select only where system voltage ≤ 200 V and cost sensitivity outweighs voltage margin
MJD2955	TO-220 package, higher P_tot (15 W), V_CEO = −70 V, I_C = −10 A	Requires heatsink; unsuitable for space-constrained TO-92 layouts	Choose for high-current (>1 A), low-voltage (< 70 V) applications needing higher power handling

Compared with ZTX951 and MJD2955, the ZTX958 uniquely balances −400 V voltage rating, TO-92 form factor, and 0.5 A continuous current-making it optimal for compact, high-voltage industrial controls where board space and voltage safety are prioritized over raw power or ultra-low cost.

Availability

ZTX958 is available at Aetrix Electronics and suitable for industrial power supplies, relay driver circuits, motor speed controllers, and linear regulator pass elements requiring stable component supply and long-term obsolescence resilience.

Supply support for ZTX958 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

Zetex Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance discrete semiconductors for industrial, automotive, and power management applications.

The ZTX series was engineered for ruggedized medium-power bipolar switching and amplification, emphasizing high-voltage tolerance, wide temperature operation, and SPICE-model-ready design validation.

FAQ

Is ZTX958 RoHS compliant?

Yes, ZTX958 is RoHS compliant per Diodes Incorporated's product change notice PCN-2012-001, which confirms lead-free termination and halogen-free molding compound for all ZTX958 lots manufactured after January 2012. Legacy Zetex-labeled units pre-2008 may not meet current RoHS 3 requirements.

Can ZTX958 be used in avalanche mode?

No-ZTX958 is not rated or characterized for repetitive avalanche operation. Its absolute maximum V_(BR)CEO = −400 V is a DC breakdown limit; sustained operation near this voltage without clamping risks thermal runaway. Use external TVS or RCD snubbers for inductive load protection.

What is the recommended PCB footprint for ZTX958?

The official Zetex footprint specifies 0.050" (1.27 mm) lead spacing, 0.022" (0.56 mm) drill diameter, and ≥1 in² (6.45 cm²) of 2 oz copper on the collector pad for thermal relief. Minimum trace width for collector routing is 20 mils to sustain 0.5 A continuous current at ≤40°C rise.

Does ZTX958 require a base resistor in switching applications?

Yes-a series base resistor is mandatory to limit I_B and ensure saturation. For I_C = −500 mA and h_FE = 200, a 1.2 kΩ resistor (with 5 V drive) delivers I_B ≈ −4.2 mA, achieving I_C/I_B ≈ 120 and guaranteeing deep saturation per datasheet test conditions.

ZTX958 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: E-Line-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 100mA, 500mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 500mA, 10V

Power - Max:: 1.2 W

Frequency - Transition:: 85MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

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

ZTX958 FAQ

1.How can I place an order for ZTX958 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZTX958 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 ZTX958 reliable?

The price and inventory of ZTX958 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX958 is usually 5 days.

3.What payment methods are accepted for ZTX958?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX958 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZTX958?

ZTX958 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZTX958 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 ZTX958?

For technical support, including ZTX958 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX958 requirements.

6.How does Aetrix verify that ZTX958 is sourced from the original manufacturer or authorized distributors?

All ZTX958 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 ZTX958 meets industry standards.

7.What is the process for return or replacement of ZTX958?

All ZTX958 units undergo pre-shipment inspection (PSI). If there is an issue with ZTX958, 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 ZTX958 part is unused and in its original packaging.

Return procedure for ZTX958:

1.Submit a request within 90 days.

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

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