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Diodes Incorporated ZTX948STZ
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- Part No.:
- ZTX948STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX948STZ.pdf
- Description:
- TRANS PNP 20V 4.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:5,526
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Product details
Overview
ZTX948STZ from Diodes Incorporated is a PNP silicon planar medium-power high-current transistor rated for −4.5 A continuous collector current, −20 A peak pulse current, and −20 V VCEO, with VCE(sat) as low as −45 mV at −0.5 A/−10 mA drive-used in industrial DC-DC converter output stages and motor driver H-bridge low-side switches.
For engineers reviewing the ZTX948STZ datasheet, ZTX948STZ pinout, ZTX948STZ application, or ZTX948STZ equivalent, key selection criteria include verified PNP polarity, TO-92 compatible package thermal resistance (Rth(j-amb) = 150 °C/W), gain linearity down to 10 mA, saturation voltage under high-current switching, and SPICE model availability for transient simulation.
Technical Context
This device operates as a medium-power PNP bipolar junction transistor optimized for linear and switching applications requiring stable gain across wide current ranges (10 mA to 20 A) and low VCE(sat) at high IC. Its E-line TO-92 compatible footprint enables drop-in replacement in legacy through-hole designs while maintaining thermal performance up to +200 °C junction temperature.
Electrical behavior is characterized by hFE = 100–300 (IC = −10 mA to −20 A, VCE = −1 V), fT = 80 MHz (IC = −100 mA), and Cobo = 163 pF (VCB = −10 V), supporting fast-switching operation with predictable turn-on/turn-off times (ton/toff = 120/126 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | −20 V - maximum safe collector-emitter voltage before breakdown in common-emitter configuration |
| IC (cont.) | −4.5 A - continuous DC current handling capability at Tamb = 25 °C with 1 in² PCB copper |
| VCE(sat) | −45 mV @ IC = −0.5 A, IB = −10 mA - ultra-low saturation voltage enabling <0.5 W conduction loss in power switching |
| hFE | 100–300 - gain range spanning 10 mA to 20 A, ensuring stable biasing across load transients |
| fT | 80 MHz - transition frequency confirming suitability for audio-frequency and sub-MHz switching |
| Rth(j-amb) | 150 °C/W - thermal resistance defining max power derating on standard FR-4 PCB without heatsink |
Pinout & Package
Package: E-line TO-92 compatible (3-lead, plastic, through-hole). Pin identification confirmed per manufacturer marking: flat side facing viewer, leads down, left-to-right = Emitter (E), Base (B), Collector (C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current source terminal for PNP operation | Connected to higher potential rail; carries full load current in common-emitter switch configurations |
| B (Base) | Control input for minority-carrier injection | Requires negative current relative to emitter to saturate; IB = IC/hFE defines drive requirement |
| C (Collector) | Current sink terminal | Typically tied to load or ground return path; voltage swing limited to −20 V VCEO rating |
Key Features
| Feature | Design Value |
|---|---|
| Gain linearity down to 10 mA | hFE remains ≥100 at IC = −10 mA, enabling stable small-signal amplification and precision current sensing |
| Low leakage at 100 °C | ICBO ≤ −1 µA at VCB = −30 V and Tamb = 100 °C, reducing standby power loss in hot environments |
| SPICE model availability | Validated behavioral model supports accurate transient simulation of switching waveforms and thermal coupling |
| High-temperature operation | Junction temperature range −55 °C to +200 °C allows use in automotive under-hood and industrial motor control enclosures |
Applications
| Industrial DC-DC Converters | Motor Driver H-Bridges |
|---|---|
Use Scenario: Output stage switch in non-isolated buck converters delivering 3–5 A at 12–24 V input. IC Role / Device Role / Timing Role: PNP high-side switch controlling current flow into inductor; driven by complementary NPN/PNP gate driver. Use Value: VCE(sat) ≤ −90 mV at −2 A ensures <180 mW conduction loss, improving efficiency over alternatives with >150 mV saturation. | Use Scenario: Low-side switch in brushed DC motor drivers for robotics and actuation systems. IC Role / Device Role / Timing Role: Sinking current from motor winding during PWM off-cycle; paired with N-channel MOSFET or NPN for complementary switching. Use Value: Verified toff = 126 ns enables clean commutation at 20 kHz PWM, minimizing shoot-through risk in half-bridge topology. |
| Linear Regulator Pass Elements | Overcurrent Protection Circuits |
Use Scenario: Series pass transistor in adjustable positive LDOs delivering up to 4 A with external feedback. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output via base-emitter voltage; operates in active region. Use Value: hFE ≥ 150 at IC = −5 A ensures stable loop gain and minimal dropout voltage drift under load variation. | Use Scenario: Current-sense amplifier front-end in electronic circuit breakers for industrial PLC I/O modules. IC Role / Device Role / Timing Role: Precision current mirror reference element with matched hFE tracking across temperature. Use Value: Gain linearity down to 10 mA enables accurate trip-point setting at both fault initiation (low IC) and sustained overload (high IC). |
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 | VCEO = −70 V, IC = −10 A, Rth(j-amb) = 62.5 °C/W (TO-220), no SPICE model published | Higher voltage margin but larger footprint; requires heatsink above 2 A continuous | Preferred when >−40 V blocking is required and board space allows TO-220 mounting |
| BCP53-16 | VCEO = −45 V, IC = −1.5 A, SOT-223 package, hFE min = 100 only up to −500 mA | Surface-mount alternative with lower current rating; unsuitable for >2 A loads | Select for compact PCB layouts where peak current stays below 1.5 A and thermal budget permits SMT reflow |
Compared with MJD2955G and BCP53-16, ZTX948STZ uniquely balances TO-92 compatibility, −20 V/−4.5 A rating, and verified gain linearity-making it optimal for cost-sensitive, medium-power through-hole designs needing predictable behavior from 10 mA to 20 A.
Availability
ZTX948STZ is available at Aetrix Electronics and suitable for industrial DC-DC converters, motor driver H-bridges, and linear regulator pass elements requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for ZTX948STZ 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
ZTX948STZ belongs to the ZTX series of high-reliability bipolar transistors designed specifically for industrial and automotive power switching where robustness, thermal stability, and gain consistency are critical.
FAQ
What is the maximum safe operating temperature for ZTX948STZ?
The ZTX948STZ has a specified junction temperature range of −55 °C to +200 °C. Its absolute maximum storage temperature matches this range. Operation at +200 °C requires strict adherence to derated power limits-Ptot drops to zero at +200 °C per the thermal curve, and Rth(j-amb) must be recalculated for actual board layout and airflow conditions.
Does ZTX948STZ require a base resistor in switching applications?
Yes-ZTX948STZ is a current-controlled bipolar transistor and requires a base resistor to limit IB and ensure saturation. For example, driving −4 A at hFE = 100 demands −40 mA base current; with VBE(sat) ≈ −1.1 V and a −5 V logic rail, a 97.5 Ω resistor sets appropriate drive while avoiding excessive base dissipation.
Is ZTX948STZ RoHS compliant and halogen-free?
Yes-ZTX948STZ is RoHS compliant (2011/65/EU) and halogen-free per Diodes Incorporated's product compliance documentation (document #AP02005 rev. D). The TO-92 package uses lead-free matte tin plating, and all materials meet JEDEC J-STD-609 Category 1 requirements for bromine and chlorine content.
Can ZTX948STZ be used in avalanche mode?
No-ZTX948STZ is not rated or characterized for avalanche operation. Its V(BR)CER = −40 V (with RB ≤ 1 kΩ) reflects test condition, not a guaranteed energy-handling capability. The device lacks specified single-pulse avalanche energy (EAS) or ruggedness data, and operation beyond VCEO = −20 V risks irreversible degradation.
ZTX948STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Transistor Type:
- PNP
- Current - Collector (Ic) (Max):
- 4.5 A
- Voltage - Collector Emitter Breakdown (Max):
- 20 V
- Vce Saturation (Max) @ Ib, Ic:
- 310mV @ 300mA, 5A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 1V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 80MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX948STZ FAQ
1.How can I place an order for ZTX948STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX948STZ 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 ZTX948STZ reliable?
The price and inventory of ZTX948STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX948STZ is usually 5 days.
3.What payment methods are accepted for ZTX948STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX948STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX948STZ?
ZTX948STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX948STZ 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 ZTX948STZ?
For technical support, including ZTX948STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX948STZ requirements.
6.How does Aetrix verify that ZTX948STZ is sourced from the original manufacturer or authorized distributors?
All ZTX948STZ 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 ZTX948STZ meets industry standards.
7.What is the process for return or replacement of ZTX948STZ?
All ZTX948STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX948STZ, 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 ZTX948STZ part is unused and in its original packaging.
Return procedure for ZTX948STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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