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Diodes Incorporated ZTX955STOA
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- Part No.:
- ZTX955STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX955STOA.pdf
- Description:
- TRANS PNP 140V 3A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:6,950
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Product details
Overview
ZTX955STOA from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor rated for −3 A continuous collector current, −140 V VCEO, and 1.2 W power dissipation at 25°C ambient. It delivers low saturation voltage (−90 mV at −1 A/−100 mA), high DC gain (hFE = 140 min at −3 A), and 110 MHz transition frequency - deployed in industrial motor control drivers and high-side switching circuits.
For engineers reviewing the ZTX955STOA datasheet, ZTX955STOA pinout, ZTX955STOA application, or ZTX955STOA equivalent, key selection criteria include verified PNP polarity, TO-92-compatible E-Line package thermal resistance (Rth(j-amb) = 150°C/W), −180 V VCBO rating, and pulsed ICM = −10 A capability under 2% duty cycle conditions.
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded configuration and supports linear amplification up to −3 A and switching applications requiring fast turn-on (ton = 68 ns) and controlled turn-off (toff = 1030 ns) under −50 V VCC. Its hFE remains stable across −10 mA to −3 A, and VBE(sat) stays below −1.05 V at −3 A/−300 mA drive.
The device uses planar epitaxial construction with gold-doped base region for improved minority-carrier lifetime control. Thermal performance is characterized by Rth(j-case) = 50°C/W and validated safe operating area curves up to 175°C junction temperature under single-pulse and DC conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −140 V - Maximum blocking voltage between collector and emitter with base open; defines high-side switch voltage headroom |
| IC (continuous) | −3 A - Sustained DC load current capability without derating at Tamb = 25°C on standard PCB copper area |
| VCE(sat) | −90 mV @ −1 A/−100 mA - Low conduction loss enabling <0.1 W dissipation in saturated switching mode |
| hFE | 140 min @ −3 A/−5 V - Confirmed current gain sufficient for direct microcontroller GPIO drive without secondary gain stage |
| fT | 110 MHz @ −100 mA/−10 V - Supports high-speed switching above 100 kHz PWM in SMPS and Class-D amplifier output stages |
| Rth(j-amb) | 150 °C/W - Thermal resistance measured on 1-inch² PCB copper; determines required heatsinking for >0.5 W operation |
Pinout & Package
Package: E-Line TO-92-compatible (3-321 outline), plastic molded, through-hole mounting. Dimensions conform to JEDEC TO-92 standard with lead pitch 0.375 inch (9.5 mm).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to positive rail in high-side switch; requires robust trace routing for −3 A return path |
| B (Base) | Control input for minority-carrier injection | Driven negative relative to emitter; −300 mA peak base current needed for full −3 A saturation |
| C (Collector) | Current sink terminal | Connected to load; must withstand −140 V transients in inductive switching applications |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | −90 mV at −1 A ensures <0.1 W conduction loss, reducing thermal stress in compact enclosures |
| High ICM | −10 A peak pulse rating enables reliable handling of motor startup surges and relay coil kickback |
| Wide Tj range | −55°C to +200°C operation supports deployment in automotive engine compartments and industrial furnaces |
| SPICE model available | Validated behavioral model included for accurate transient simulation in LTspice and PSpice environments |
Applications
| Industrial Motor Drivers | High-Side Power Switches |
|---|---|
Use Scenario: Driving 24 V DC brushed motors in PLC-controlled conveyor systems with stall currents up to −2.5 A. IC Role / Device Role / Timing Role: PNP high-side switch controlling motor supply rail; operated in saturation with microcontroller-driven base resistor network. Use Value: −90 mV VCE(sat) limits power loss to <0.25 W at full load, eliminating need for external heatsink on standard FR4 PCB. |
Use Scenario: Enabling 48 V battery backup circuits in telecom power supplies where load disconnect must withstand −100 V transients. IC Role / Device Role / Timing Role: High-voltage PNP pass element in OR-ing configuration; biased via current-limited base driver for soft-start control. Use Value: −180 V VCBO rating provides 35% margin over 48 V system max, ensuring reliability during load dump events. |
| Linear Regulator Pass Elements | Switch-Mode Power Supply Drivers |
Use Scenario: Series pass transistor in −12 V, 1.5 A adjustable linear regulator for analog sensor signal conditioning. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output via feedback loop; operated in active region with VCE ≈ −4 V. Use Value: hFE stability (140 min at −3 A) ensures consistent regulation accuracy across full load range without gain compensation. |
Use Scenario: Gate driver stage for −60 V N-channel MOSFETs in half-bridge LLC resonant converters. IC Role / Device Role / Timing Role: Fast-switching PNP pull-up device complementing NPN pull-down in totem-pole output stage. Use Value: 68 ns ton and 110 MHz fT support clean 500 kHz gate drive with minimal shoot-through risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP high-current switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | TO-220 package, Rth(j-amb) = 40°C/W, VCEO = −70 V, IC = −10 A | Higher power handling but lower voltage rating; requires heatsink for >1 W dissipation | Select when board space allows TO-220 mounting and system voltage ≤70 V |
| BCP53-16 | SOT-223 package, IC = −1.5 A, VCEO = −45 V, Rth(j-amb) = 125°C/W | Surface-mount alternative with reduced voltage/current capability and higher thermal resistance | Select only for space-constrained low-power (<0.5 A) applications where reflow compatibility is mandatory |
Compared with MJD2955G and BCP53-16, ZTX955STOA uniquely balances −140 V blocking, −3 A current, and TO-92 mountability - making it optimal for through-hole industrial controls where voltage margin and PCB real estate are both critical constraints.
Availability
ZTX955STOA is available at Aetrix Electronics and suitable for industrial motor drivers, high-side power switches, linear regulator pass elements, and switch-mode power supply drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZTX955STOA 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 centers across Asia and manufacturing in China, Taiwan, and the Philippines.
ZTX955STOA belongs to Diodes' legacy high-reliability bipolar transistor product line, engineered specifically for ruggedized industrial and automotive auxiliary power applications demanding wide temperature operation and high surge tolerance.
FAQ
What is the maximum safe operating temperature for ZTX955STOA?
The ZTX955STOA has a specified junction temperature range of −55°C to +200°C. Operation at +200°C is permitted only under derated power conditions per the transient thermal impedance curve; continuous operation above +175°C requires strict thermal monitoring and reduced IC to maintain Rth(j-amb) compliance.
Can ZTX955STOA be used in parallel for higher current capacity?
No - ZTX955STOA lacks built-in emitter ballasting resistors and exhibits positive thermal coefficient of VBE(sat), leading to current hogging when paralleled. For >3 A applications, use a single higher-rated device such as MJD2955G or implement active current-sharing circuitry.
Is the SPICE model for ZTX955STOA compatible with LTspice?
Yes - Diodes Incorporated provides an industry-standard .MODEL statement for ZTX955STOA validated against measured DC and transient characteristics. The model includes temperature-dependent parameters and is directly importable into LTspice IV and XVII without modification.
Does ZTX955STOA meet RoHS and REACH requirements?
Yes - ZTX955STOA is manufactured in compliance with EU RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Certificate of Compliance and material declarations are available upon request from Diodes Incorporated's technical documentation portal.
ZTX955STOA 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):
- 3 A
- Voltage - Collector Emitter Breakdown (Max):
- 140 V
- Vce Saturation (Max) @ Ib, Ic:
- 330mV @ 300mA, 3A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 5V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 110MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX955STOA FAQ
1.How can I place an order for ZTX955STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX955STOA 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 ZTX955STOA reliable?
The price and inventory of ZTX955STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX955STOA is usually 5 days.
3.What payment methods are accepted for ZTX955STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX955STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX955STOA?
ZTX955STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX955STOA 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 ZTX955STOA?
For technical support, including ZTX955STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX955STOA requirements.
6.How does Aetrix verify that ZTX955STOA is sourced from the original manufacturer or authorized distributors?
All ZTX955STOA 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 ZTX955STOA meets industry standards.
7.What is the process for return or replacement of ZTX955STOA?
All ZTX955STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX955STOA, 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 ZTX955STOA part is unused and in its original packaging.
Return procedure for ZTX955STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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