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Diodes Incorporated ZTX958STOA
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- Part No.:
- ZTX958STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX958STOA.pdf
- Description:
- TRANS PNP 400V 0.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,793
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Product details
Overview
ZTX958STOA from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor designed for linear and switching applications in industrial power supplies, motor drivers, and relay drivers. It delivers −0.5 A continuous collector current, −1.5 A peak pulse current, and exhibits very low VCE(sat) (−100 mV at IC = −10 mA, IB = −1 mA), with hFE ≥ 100 at IC = −10 mA and fT = 85 MHz.
For engineers reviewing the ZTX958STOA datasheet, ZTX958STOA pinout, ZTX958STOA application, or ZTX958STOA equivalent, key selection criteria include its −400 V VCEO rating, TO-92 compatible E-Line package, thermal resistance of 150 °C/W (junction-to-ambient), and verified performance across −55 °C to +200 °C operating temperature range.
Technical Context
This PNP bipolar junction transistor operates in common-emitter configuration with base-controlled current amplification. Its high breakdown voltage (VCEO = −400 V, VCBO = −400 V) supports use in high-voltage DC-DC converters and snubber circuits, while low saturation voltage enables efficient switching at moderate currents.
The device features robust thermal capability (Tj up to +200 °C) and stable gain (hFE = 100–300 across IC = −10 mA to −1 A), validated under pulsed conditions (300 µs, ≤2% duty cycle). Its 19 pF Cobo and 85 MHz fT support medium-frequency switching up to several MHz in hard-switched topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −400 V - Enables operation in 300–400 V DC bus applications without secondary breakdown risk |
| IC (continuous) | −0.5 A - Supports sustained load switching in relay drivers and linear regulators |
| VCE(sat) | −100 mV @ IC = −10 mA - Minimizes conduction loss in low-voltage control stages |
| hFE | 100–300 @ IC = −10 mA to −1 A - Ensures reliable base drive margin across wide current range |
| fT | 85 MHz - Supports switching above audio frequencies in Class-B amplifiers or PWM modulators |
| Rth(j-amb) | 150 °C/W - Requires ≥1 in² copper pad on PCB for full 1.2 W dissipation at 25 °C ambient |
| Tj max | +200 °C - Allows deployment in under-hood automotive or high-temp industrial enclosures |
Pinout & Package
Package: TO-92 compatible E-Line (3-lead, straight lead, epoxy molded). Standard pinout orientation (flat side facing viewer, leads down): Emitter (left), Base (center), Collector (right).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal for PNP operation | Connected to higher potential rail; base-emitter forward bias initiates conduction |
| Base (B) | Control input for minority-carrier injection | Requires negative current relative to emitter to turn on; typical IB/IC = 1/10 to 1/20 |
| Collector (C) | Output current path | Connected to load and lower-potential node; carries full switched current with minimal VCE drop |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | −400 V enables direct interface with 380 V rectified mains or HV battery systems |
| Low VCE(sat) | −100 mV at light load reduces heat generation in always-on bias networks |
| Wide hFE range | 100–300 ensures consistent gain across production lots and temperature extremes |
| SPICE model available | Enables accurate transient simulation of switching behavior and thermal coupling in circuit design |
| Extended Tj range | −55 °C to +200 °C supports operation in oil-filled transformers or engine-control modules |
Applications
| Industrial Power Supply | DC Motor Driver |
|---|---|
Use Scenario: Regulating auxiliary 12 V rail in 300 V input offline SMPS using linear pass element. IC Role / Device Role / Timing Role: PNP pass transistor in series-regulator topology, dissipating up to 1.2 W continuously. Use Value: Low VCE(sat) and stable hFE maintain regulation accuracy across line/load transients and temperature drift. | Use Scenario: Driving small brushed DC motors (≤24 V, ≤300 mA) in factory automation actuators. IC Role / Device Role / Timing Role: High-side switch controlling motor direction via H-bridge half-bridge complement. Use Value: −400 V VCEO withstands inductive kickback spikes without clamping diodes in cost-sensitive designs. |
| Relay Driver | High-Voltage Snubber |
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC output modules. IC Role / Device Role / Timing Role: Saturated PNP switch providing >100 mA coil current with <100 µs turn-off delay. Use Value: Verified toff = 2400 ns at IC = −500 mA ensures fast relay release in safety-critical sequencing. | Use Scenario: Absorbing turn-off energy in flyback transformer primary during MOSFET commutation. IC Role / Device Role / Timing Role: Clamping transistor in active snubber network, triggered by voltage threshold comparator. Use Value: +200 °C Tj max and 1.58 W peak power handling sustain repeated transient stress without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-voltage switching transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX951 | VCEO = −300 V, IC = −0.5 A, Rth(j-amb) = 175 °C/W | Limited to ≤300 V systems; higher thermal resistance requires larger copper area | Select when lower cost is prioritized and voltage stress remains below 250 V DC |
| MJD2955G | TO-220 package, IC = −10 A, VCEO = −60 V, Ptot = 75 W | Higher current but lower voltage rating; unsuitable for >70 V applications | Choose only for high-current, low-voltage linear regulation where TO-92 footprint is not required |
Compared with ZTX958STOA, ZTX951 trades 100 V breakdown margin for slightly lower cost, while MJD2955G offers 20× higher current but sacrifices 85% of voltage capability-making ZTX958STOA uniquely balanced for medium-current, high-voltage discrete switching where TO-92 fit and thermal constraints apply.
Availability
ZTX958STOA is available at Aetrix Electronics and suitable for industrial power supplies, DC motor drivers, relay drivers, and high-voltage snubber circuits requiring stable component supply and long-term manufacturability.
Supply support for ZTX958STOA 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 components for industrial, automotive, and computing markets.
ZTX958STOA belongs to the ZTX series of high-voltage bipolar transistors engineered for ruggedized switching and linear regulation in harsh-environment power electronics.
FAQ
Is ZTX958STOA RoHS compliant and halogen-free?
Yes, ZTX958STOA meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The device uses lead-free matte tin plating on leads and complies with JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30 °C/85% RH).
What is the maximum safe operating area (SOA) limit at 100 °C case temperature?
At TC = 100 °C, the SOA curve limits continuous operation to IC ≤ −250 mA at VCE = −200 V, or IC ≤ −500 mA at VCE ≤ −100 V. Derating follows the published transient thermal impedance curve with D = 0.1 for pulsed loads.
Can ZTX958STOA be used in avalanche mode?
No-ZTX958STOA is not rated or characterized for controlled avalanche operation. Its V(BR)CER test condition (RB ≤ 1 kΩ) indicates intended use in forward-active or saturated switching, not repetitive avalanche energy absorption.
Does the SPICE model include thermal and temperature-dependent parameters?
Yes, the official Diodes Incorporated SPICE model for ZTX958 includes temperature-dependent β, VBE, and thermal network elements (Rth, Cth) calibrated to measured junction-to-case and junction-to-ambient characteristics across −55 °C to +175 °C.
ZTX958STOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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)
ZTX958STOA FAQ
1.How can I place an order for ZTX958STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX958STOA 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 ZTX958STOA reliable?
The price and inventory of ZTX958STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX958STOA is usually 5 days.
3.What payment methods are accepted for ZTX958STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX958STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX958STOA?
ZTX958STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX958STOA 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 ZTX958STOA?
For technical support, including ZTX958STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX958STOA requirements.
6.How does Aetrix verify that ZTX958STOA is sourced from the original manufacturer or authorized distributors?
All ZTX958STOA 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 ZTX958STOA meets industry standards.
7.What is the process for return or replacement of ZTX958STOA?
All ZTX958STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX958STOA, 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 ZTX958STOA part is unused and in its original packaging.
Return procedure for ZTX958STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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