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Diodes Incorporated ZTX956STOA
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- Part No.:
- ZTX956STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX956STOA.pdf
- Description:
- TRANS PNP 200V 2A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:8,251
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Product details
Overview
ZTX956STOA from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor designed for switching and linear amplification in industrial power control circuits. It delivers −2 A continuous collector current, −200 V VCEO, −150 mV VCE(sat) at −2 A/−400 mA drive, and 100–300 hFE across 10 mA–2 A, enabling robust operation in DC-DC converters and motor driver stages.
For engineers reviewing the ZTX956STOA datasheet, ZTX956STOA pinout, ZTX956STOA application, or ZTX956STOA equivalent, key selection criteria include verified −200 V blocking capability, low −150 mV saturation voltage under full load, thermal resistance of 50 °C/W (junction-to-case), TO-92 package compatibility, and SPICE model availability for simulation validation.
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded configuration in common-emitter switching topologies. Its −220 V VCBO and −200 V VCEO support high-voltage off-state isolation in relay drivers and solenoid controls, while its fT of 110 MHz ensures adequate bandwidth for fast-switching applications up to ~100 kHz.
The device exhibits stable hFE from 100 (at −10 mA) to 150 (at −2 A), confirming consistent current gain across operating range. Saturation voltage remains ≤−150 mV up to −2 A with −400 mA base drive, minimizing conduction loss in high-current switching nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −200 V: Maximum safe collector-emitter voltage before breakdown in open-base condition |
| IC (cont.) | −2 A: Continuous DC collector current rating at Tamb = 25°C with PCB heatsinking |
| VCE(sat) | −150 mV @ −2 A/−400 mA: Low on-state voltage drop enabling <0.3 W conduction loss at full load |
| hFE | 150 @ −2 A/−5 V: Confirmed DC current gain sufficient for direct microcontroller GPIO drive |
| fT | 110 MHz: Transition frequency supporting reliable switching up to 100 kHz with margin |
| Rth(j-case) | 50 °C/W: Junction-to-case thermal resistance enabling 1.2 W dissipation with 60°C case rise |
Pinout & Package
Package: TO-92 (E-Line compatible, 3-324 outline), through-hole mounting, epoxy molded, lead-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; base-emitter forward bias initiates conduction |
| B (Base) | Control input for minority-carrier injection | Receives negative current to turn on; requires −400 mA for full −2 A saturation |
| C (Collector) | Current sink terminal | Connected to load; sustains −200 V reverse bias when off; carries full load current when on |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | −150 mV at −2 A enables <0.3 W conduction loss without forced cooling |
| High VCEO | −200 V supports direct interface with 120 VAC rectified rails or 100 V DC bus systems |
| SPICE model available | Enables accurate transient simulation of switching behavior and thermal stress in circuit design |
| Wide temperature range | Rated from −55°C to +200°C junction temperature, suitable for under-hood or industrial enclosure use |
Applications
| Relay Driver Stage | DC Motor H-Bridge Low-Side Switch |
|---|---|
Use Scenario: Driving 12 V/500 mA electromagnetic relay coils in PLC output modules. IC Role / Device Role / Timing Role: PNP switch sinking coil current to ground during activation; handles inductive kickback via inherent VCEO margin. Use Value: −200 V VCEO prevents breakdown during 100+ V flyback transients; −150 mV VCE(sat) limits self-heating to <0.1 W at rated load. | Use Scenario: Low-side switching in brushed DC motor control for HVAC actuators. IC Role / Device Role / Timing Role: Sinks motor current during PWM on-cycles; operates at 20 kHz with <1.2 µs total switching time. Use Value: 110 MHz fT and 67 ns ton ensure clean edge fidelity; hFE ≥150 at −2 A allows direct MCU GPIO drive without external buffer. |
| Linear Regulator Pass Element | High-Voltage LED String Switch |
Use Scenario: Series pass transistor in −15 V/1.5 A adjustable linear regulator for analog instrumentation. IC Role / Device Role / Timing Role: Operates in active region to regulate output; dissipates up to 1.2 W continuously. Use Value: Rth(j-case) = 50 °C/W permits stable operation with minimal heatsink; hFE stability ensures consistent loop gain over temperature. | Use Scenario: On/off control of 80 V, 1.2 A white LED string in architectural lighting. IC Role / Device Role / Timing Role: High-side PNP switch (emitter to 80 V rail) controlling LED current path. Use Value: −220 V VCBO provides 40% margin above 80 V rail; −150 mV VCE(sat) minimizes forward voltage drop and improves efficiency. |
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 |
|---|---|---|---|
| MJD2955G | TO-220 package, −75 V VCEO, −10 A IC, higher Ptot (75 W) | Requires heatsink; unsuitable for >−75 V rails | Select when higher current (>−2 A) and forced cooling are available |
| ZTX951 | Same TO-92 package, −100 V VCEO, −1 A IC, lower VCE(sat) (−100 mV) | Limited to ≤−100 V systems; lower power handling | Select for cost-sensitive ≤−100 V, <−1 A applications where footprint must match |
Compared with MJD2955G and ZTX951, ZTX956STOA uniquely balances −200 V blocking, −2 A current, TO-92 fit, and low saturation voltage-making it optimal for space-constrained, high-voltage industrial switching where thermal budget is moderate and no heatsink is desired.
Availability
ZTX956STOA is available at Aetrix Electronics and suitable for industrial motor control, relay interface modules, and high-voltage LED drivers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for ZTX956STOA 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 and signal integrity solutions for industrial and automotive markets.
ZTX956STOA belongs to the ZTX series of high-voltage bipolar transistors, engineered specifically for ruggedized switching in industrial power interfaces where voltage margin, thermal robustness, and TO-92 compatibility are critical.
FAQ
What is the maximum safe operating voltage for ZTX956STOA in a relay driver?
The ZTX956STOA supports up to −200 V collector-emitter voltage (VCEO) with open base, making it suitable for driving relays fed from rectified 120 VAC (≈−170 V peak). For reliability, derate to ≤−160 V in continuous operation with temperature margin per the datasheet's SOA curve.
Can ZTX956STOA be driven directly by a 3.3 V microcontroller GPIO?
No-ZTX956STOA is a PNP transistor requiring negative base current to turn on. A 3.3 V GPIO cannot sink sufficient current without an NPN pre-driver or level-shifting circuit. Base drive must deliver −400 mA for full −2 A saturation, typically via a Darlington or MOSFET buffer stage.
Is there a lead-free and RoHS-compliant version of ZTX956STOA?
Yes-ZTX956STOA is manufactured in compliance with RoHS Directive 2011/65/EU and is lead-free. The "STOA" suffix denotes standard TO-92 packaging with lead-free terminations and halogen-free molding compound, verified per Diodes Incorporated's material declarations.
How does thermal performance change when mounted on a 1-inch² copper pad?
With a minimum 1-inch² copper pad (per datasheet note), Rth(j-amb) drops to 150 °C/W, allowing 1.2 W dissipation at 25°C ambient. Without this pad, ambient thermal resistance rises sharply-limiting usable power to ~0.5 W at 25°C. Thermal derating curves in the datasheet must be applied for elevated ambient temperatures.
ZTX956STOA 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):
- 2 A
- Voltage - Collector Emitter Breakdown (Max):
- 200 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 400mA, 2A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 5V
- Power - Max:
- 1.58 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)
ZTX956STOA FAQ
1.How can I place an order for ZTX956STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX956STOA 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 ZTX956STOA reliable?
The price and inventory of ZTX956STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX956STOA is usually 5 days.
3.What payment methods are accepted for ZTX956STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX956STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX956STOA?
ZTX956STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX956STOA 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 ZTX956STOA?
For technical support, including ZTX956STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX956STOA requirements.
6.How does Aetrix verify that ZTX956STOA is sourced from the original manufacturer or authorized distributors?
All ZTX956STOA 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 ZTX956STOA meets industry standards.
7.What is the process for return or replacement of ZTX956STOA?
All ZTX956STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX956STOA, 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 ZTX956STOA part is unused and in its original packaging.
Return procedure for ZTX956STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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