My Inquiry
My Account
Diodes Incorporated ZTX551STZ
,TO-226_straightlead.jpg)
- Part No.:
- ZTX551STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX551STZ.pdf
- Description:
- TRANS PNP 60V 1A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:876
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZTX551STZ from Diodes Incorporated is a PNP medium-power bipolar junction transistor in E-Line (TO-92 compatible) package, rated for -80V collector-base voltage, -65V collector-emitter voltage, -1A continuous collector current, and 1W power dissipation at TA = +25°C with minimum 175°C/W junction-to-ambient thermal resistance. It operates across -55°C to +200°C and serves in DC-DC converter switching stages.
For engineers reviewing the ZTX551STZ datasheet, ZTX551STZ pinout, ZTX551STZ application, or ZTX551STZ equivalent, key selection criteria include its -65V VCEO rating, -1A IC capability, 150MHz fT bandwidth, -350mV VCE(sat) at -150mA/-15mA drive, and E-Line joggled-lead mechanical configuration for automated tape-and-reel assembly.
Technical Context
This PNP BJT is optimized for medium-power linear and switching applications where high breakdown voltage and robust thermal performance are required. Its 150MHz current gain-bandwidth product supports stable operation up to several tens of MHz in amplifier or oscillator configurations.
The device features a guaranteed -65V BVCEO and -80V BVCBO, enabling use in higher-voltage DC-DC topologies such as flyback or boost converters. Its -1.1V VBE(sat) at -150mA/-15mA and hFE range of 50–150 (IC = -150mA, VCE = -10V) support predictable base drive design in discrete driver circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -65 V - maximum safe collector-emitter reverse bias before avalanche conduction |
| IC (cont) | -1 A - continuous DC collector current limit under specified thermal conditions |
| fT | 150 MHz - usable small-signal amplification bandwidth at VCE = -10V, IC = -150mA |
| VCE(sat) | -350 mV - low saturation voltage ensures minimal conduction loss in switching mode |
| RθJA | 175 °C/W - thermal resistance with minimum recommended pad layout and 12mm lead length |
| TJ max | +200 °C - maximum junction temperature enabling operation in high-ambient industrial environments |
| hFE | 50–150 - DC current gain range at IC = -150mA, VCE = -10V, supporting reliable base biasing |
Pinout & Package
E-Line (TO-92 compatible) package with joggled leads for tape-and-reel handling; molded green plastic body (UL 94V-0), matte tin-plated terminals, 0.159g mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to most positive rail in PNP switch configuration; carries full load current |
| Collector (C) | Current source terminal | Connected to load; voltage swing referenced to emitter; handles -65V reverse bias |
| Base (B) | Control input | Receives negative drive current to turn on; requires -15mA for full saturation at -150mA IC |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | BVCBO = -80V and BVCEO = -65V enable use in 48V+ industrial power rails |
| High-temperature operation | Junction rating up to +200°C supports under-hood automotive and enclosed industrial designs |
| Lead-free & green compliance | Fully RoHS 3 compliant with <900ppm Br/Cl and <1000ppm Sb; halogen-free molding compound |
| Robust ESD tolerance | 4kV HBM rating per JEDEC JESD22-A114 reduces risk of handling damage in assembly |
Applications
| LCD Backlight Converter | Emergency Lighting Driver |
|---|---|
Use Scenario: Step-up DC-DC converter driving CCFL or LED strings in automotive or industrial displays. IC Role / Device Role / Timing Role: PNP switch controlling primary-side current in flyback topology; driven by PWM controller. Use Value: -65V VCEO withstands reflected flyback spikes; -350mV VCE(sat) minimizes conduction loss at 150–500mA loads. | Use Scenario: Constant-current LED driver activated during mains failure in commercial exit signs. IC Role / Device Role / Timing Role: Medium-power PNP pass transistor regulating battery-fed LED current. Use Value: +200°C TJ rating ensures reliability in sealed enclosures; 150MHz fT supports fast transient response to load steps. |
| Industrial DC-DC Module | Low-Noise Linear Regulator Pass Element |
Use Scenario: Isolated 24V-to-5V converter in programmable logic controllers with wide ambient range. IC Role / Device Role / Timing Role: Primary-side switching transistor in discrete transformer-driven topology. Use Value: 175°C/W RθJA allows thermal management on standard FR4 without heatsink at ≤500mW dissipation. | Use Scenario: Pre-regulator stage delivering clean 12V supply to analog sensor front-ends. IC Role / Device Role / Timing Role: PNP series pass element in discrete LDO architecture with external feedback. Use Value: hFE = 50–150 enables stable loop compensation; -1.1V VBE(sat) sets predictable dropout voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | TO-220 package, -70V VCEO, -10A IC, higher PD (115W), RθJA = 1.5°C/W | Requires heatsink; suited for >1A continuous loads; not drop-in for E-Line footprint | Select when higher current and thermal headroom are needed; board redesign required |
| ZTX550STZ | Same E-Line joggled package but lower ratings: -45V VCEO, -60V VCBO, 100–300 hFE | Obsolete per Diodes; limited to ≤40V systems; less thermal margin (+150°C TJ max) | Not recommended for new designs; only for legacy repair with verified voltage derating |
Compared with MJD2955G and ZTX550STZ, ZTX551STZ provides optimal balance of compact E-Line packaging, -65V breakdown, and +200°C operation-making it suitable for space-constrained, high-ambient industrial converters where TO-220 is impractical and ZTX550STZ lacks sufficient voltage margin.
Availability
ZTX551STZ is available at Aetrix Electronics and suitable for LCD backlight converters, emergency lighting drivers, and industrial DC-DC modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ZTX551STZ 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, manufacturing, and sales operations across Asia, Europe, and North America.
ZTX551STZ belongs to Diodes' E-Line bipolar transistor family, designed specifically for cost-sensitive, medium-power switching and linear applications in industrial, automotive, and consumer power supplies.
FAQ
What is the maximum safe operating voltage between collector and emitter?
ZTX551STZ has a guaranteed minimum collector-emitter breakdown voltage (BVCEO) of -65V at IC = -10mA. This rating applies under DC or pulsed conditions with duty cycle ≤2% and pulse width ≤300µs. Operation beyond this voltage risks irreversible avalanche conduction and device failure.
Is ZTX551STZ qualified for automotive applications?
ZTX551STZ is not AEC-Q101 qualified. Diodes offers automotive-grade equivalents with Q-suffix (e.g., ZTX551QSTZ) that undergo additional stress testing, PPAP documentation, and IATF 16949 manufacturing controls. For non-automotive industrial use, ZTX551STZ meets JEDEC reliability standards and supports +200°C operation.
How does the joggled lead configuration affect PCB assembly?
The joggled leads on ZTX551STZ provide mechanical stability during automated tape-and-reel placement and prevent lateral movement before soldering. They require matching land patterns with offset pads per Diodes' E-Line outline drawing (Dim L1 = 2.50–3.50mm, L2 = 2.50mm), unlike straight-lead variants which use centered pads.
Can ZTX551STZ replace ZTX550STZ in existing designs?
ZTX551STZ is the direct replacement for obsolete ZTX550STZ, offering improved -65V VCEO (vs. -45V), -80V VCBO (vs. -60V), and +200°C TJ rating (vs. +150°C). Pinout and package are identical; no layout change is needed. Base drive requirements remain compatible due to similar hFE and VBE(sat) characteristics.
ZTX551STZ 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):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 15mA, 150mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 150mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX551STZ FAQ
1.How can I place an order for ZTX551STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX551STZ 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 ZTX551STZ reliable?
The price and inventory of ZTX551STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX551STZ is usually 5 days.
3.What payment methods are accepted for ZTX551STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX551STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX551STZ?
ZTX551STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX551STZ 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 ZTX551STZ?
For technical support, including ZTX551STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX551STZ requirements.
6.How does Aetrix verify that ZTX551STZ is sourced from the original manufacturer or authorized distributors?
All ZTX551STZ 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 ZTX551STZ meets industry standards.
7.What is the process for return or replacement of ZTX551STZ?
All ZTX551STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX551STZ, 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 ZTX551STZ part is unused and in its original packaging.
Return procedure for ZTX551STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTX551STZ Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
