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Diodes Incorporated ZTX955STZ
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- Part No.:
- ZTX955STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX955STZ.pdf
- Description:
- TRANS PNP 140V 3A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:6,497
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Product details
Overview
ZTX955STZ 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 features low saturation voltage (−90 mV at IC = −1 A, IB = −100 mA), high DC gain (hFE = 140 min at IC = −3 A), and 110 MHz transition frequency - used in industrial linear regulators and high-side switch circuits.
For engineers reviewing the ZTX955STZ datasheet, ZTX955STZ pinout, ZTX955STZ application, or ZTX955STZ equivalent, key selection criteria include verified VCEO rating, measured VCE(sat) under pulsed −3 A load, hFE consistency across temperature, and TO-92 thermal resistance (Rth(j-amb) = 150 °C/W).
Technical Context
This PNP bipolar junction transistor operates with emitter-grounded configuration and supports linear amplification and switching up to 110 MHz. Its breakdown ratings (VCEO = −140 V, VCBO = −180 V) enable use in high-voltage DC-DC feedback stages and relay drivers requiring robust reverse-bias tolerance.
The device delivers −90 mV VCE(sat) at IC = −1 A and −120 mV at IC = −3 A with corresponding base drive, while maintaining hFE ≥ 100 up to 3 A - confirming stable current gain in medium-power analog control loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −140 V - maximum safe collector-emitter voltage before avalanche in open-base condition |
| IC (continuous) | −3 A - sustained current handling without derating at Tamb = 25°C |
| VCE(sat) | −90 mV @ IC = −1 A, IB = −100 mA - low conduction loss in high-side switching |
| hFE | 140 min @ IC = −3 A, VCE = −5 V - predictable current amplification under full-load bias |
| fT | 110 MHz @ IC = −100 mA, VCE = −10 V - usable for audio-frequency amplification and fast switching |
| Rth(j-amb) | 150 °C/W - thermal limit for PCB-mounted operation with 1-inch² copper pad |
Pinout & Package
Package: TO-92 (E-Line compatible, 3-321 outline), through-hole mounting with standard lead spacing and thermal pad requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-impedance return path; carries full load current |
| Base (B) | Control input | Receives negative bias current to turn on PNP; requires current-sourcing driver |
| Collector (C) | High-voltage output node | Connected to positive rail in high-side switch; withstands −140 V reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(sat) | −90 mV at 1 A enables <100 mW conduction loss in 12 V supply rails |
| High current gain stability | hFE ≥ 100 up to −3 A ensures consistent base drive sizing across load range |
| Wide operating temperature | −55°C to +200°C junction range supports under-hood automotive and industrial motor control |
| SPICE model availability | Enables accurate transient simulation of switching behavior and thermal coupling in PSpice and LTspice |
Applications
| Industrial Linear Regulators | High-Side Load Switches |
|---|---|
Use Scenario: Adjustable 5–24 V linear regulator with external pass transistor and error amplifier. IC Role / Device Role / Timing Role: PNP pass element controlling output voltage via emitter-follower configuration. Use Value: Low VCE(sat) minimizes dropout voltage and heat generation at 2 A load. | Use Scenario: 24 V DC power distribution to solenoids and valves in PLC I/O modules. IC Role / Device Role / Timing Role: High-side switch enabling load activation referenced to system ground. Use Value: −140 V VCEO provides margin against inductive kickback during turn-off. |
| Audio Output Stages | Relay Drivers |
Use Scenario: Complementary Class-AB output stage in low-power audio amplifiers (≤5 W). IC Role / Device Role / Timing Role: PNP half of push-pull pair delivering negative half-cycle current. Use Value: 110 MHz fT ensures flat frequency response up to 20 kHz with minimal phase shift. | Use Scenario: Driving 12/24 V electromagnetic relays in HVAC control panels. IC Role / Device Role / Timing Role: Saturated switch providing full coil current with minimal base drive overhead. Use Value: Verified −3 A IC rating handles relay inrush currents exceeding 2 A peak. |
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 |
|---|---|---|---|
| ZTX951 | VCEO = −100 V, IC = −2 A, hFE = 100 min @ −1 A | Lower voltage/current rating; suitable only for ≤12 V systems | Select when lower cost and reduced thermal demand outweigh need for −140 V rating |
| MJD2955G | TO-220 package, IC = −10 A, Rth(j-amb) = 40 °C/W (with heatsink) | Requires heatsink and PCB cutout; not drop-in for TO-92 footprint | Choose for higher power dissipation where board space allows larger package |
Compared with ZTX955STZ, ZTX951 trades voltage headroom for cost savings in low-voltage designs, while MJD2955G offers higher current capacity at the expense of footprint and thermal management complexity.
Availability
ZTX955STZ is available at Aetrix Electronics and suitable for industrial linear regulators, high-side load switches, audio output stages, and relay drivers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZTX955STZ 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 Malaysia.
ZTX955STZ belongs to the ZTX series of high-reliability general-purpose transistors designed for industrial power control, analog signal conditioning, and ruggedized switching applications where thermal stability and parameter consistency are critical.
FAQ
What is the maximum safe operating junction temperature for ZTX955STZ?
The absolute maximum junction temperature is +200°C, with storage temperature also rated to +200°C. Operation above +175°C requires derating per the transient thermal impedance curve in the datasheet, and sustained operation above +150°C demands careful PCB copper area design and ambient airflow management.
Can ZTX955STZ be used in parallel configurations for higher current?
No - ZTX955STZ lacks built-in emitter ballasting or matched gain characteristics required for reliable current sharing. Parallel use risks thermal runaway due to VBE mismatch and unequal current division; discrete emitter resistors (≥0.1 Ω) and individual base resistors are mandatory if attempted.
Is SPICE modeling supported, and where can the model be obtained?
Yes - Diodes Incorporated provides an official PSpice-compatible SPICE model for ZTX955STZ, downloadable from their product page under "Design Resources." The model includes temperature-dependent parameters, junction capacitance, and switching transients validated against production characterization data.
What is the recommended PCB layout for optimal thermal performance?
Mount ZTX955STZ on a minimum 1-inch² copper pour connected to the emitter pad via multiple thermal vias. Avoid routing high-current traces near the base lead. Use solder mask defined pads and ensure ≥0.5 mm clearance from adjacent components to maintain Rth(j-amb) ≤ 150 °C/W as specified.
ZTX955STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Box (TB)
- Product Status:
- Active
- 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)
ZTX955STZ FAQ
1.How can I place an order for ZTX955STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX955STZ 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 ZTX955STZ reliable?
The price and inventory of ZTX955STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX955STZ is usually 5 days.
3.What payment methods are accepted for ZTX955STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX955STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX955STZ?
ZTX955STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX955STZ 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 ZTX955STZ?
For technical support, including ZTX955STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX955STZ requirements.
6.How does Aetrix verify that ZTX955STZ is sourced from the original manufacturer or authorized distributors?
All ZTX955STZ 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 ZTX955STZ meets industry standards.
7.What is the process for return or replacement of ZTX955STZ?
All ZTX955STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX955STZ, 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 ZTX955STZ part is unused and in its original packaging.
Return procedure for ZTX955STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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