My Inquiry
My Account
Diodes Incorporated APT27ZTR-G1
- Part No.:
- APT27ZTR-G1
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
APT27ZTR-G1.pdf
- Description:
- TRANS NPN 450V 0.8A TO-92
- Quantity:
- Payment:
- Shipping:
Inventory:2
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
APT27ZTR-G1 from Diodes Incorporated is a 450V NPN high-voltage power transistor in TO92 package, designed for low-power AC-DC SMPS applications. It delivers 0.8A continuous collector current, supports 700V collector-emitter breakdown (BVCES), and features 9V emitter-base breakdown (BVEBO). Used in mobile phone battery chargers, STB power supplies, and LED lighting drivers.
For engineers reviewing the APT27ZTR-G1 datasheet, APT27ZTR-G1 pinout, APT27ZTR-G1 application, or APT27ZTR-G1 equivalent, key selection criteria include high-voltage blocking capability (450V VCEO), safe operating area at elevated temperatures, RoHS-compliant lead-free finish, and TO92 mechanical compatibility with legacy through-hole designs.
Technical Context
This NPN bipolar junction transistor operates in linear or switching mode within low-power offline SMPS flyback and buck-derived topologies. Its 700V BVCES rating enables robust operation under transient overvoltage conditions, while its 0.5V VCE(sat) at IC = 200mA/IB = 40mA ensures low conduction loss during active switching.
The device exhibits DC current gain (hFE) of 15–40 across 100–300mA collector current at VCE = 10V, supporting stable base-driven control in discrete PWM controllers. Thermal resistance RθJA of 156.25°C/W reflects its suitability for natural-convection-cooled compact adapters without heatsinking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 450V - Sustains 450V collector-emitter voltage under open-base condition, enabling use in 230VAC primary-side switching |
| BVCES | 700V - Withstands 700V collector-emitter voltage when base is shorted to emitter, critical for surge immunity |
| IC (cont.) | 0.8A - Supports up to 0.8A continuous collector current, sufficient for <10W SMPS output power |
| VCE(sat) | 0.5V @ IC=200mA, IB=40mA - Low saturation voltage minimizes conduction loss and thermal stress in self-oscillating converters |
| hFE | 15–40 @ IC=100–300mA - Provides predictable base drive requirements for discrete oscillator and feedback circuits |
| RθJA | 156.25°C/W - Junction-to-ambient thermal resistance defines maximum power dissipation (0.8W) at 25°C ambient |
| VEBO | 9V - Emitter-base reverse breakdown allows safe biasing without zener clamping in simple driver stages |
Pinout & Package
APT27ZTR-G1 is housed in a TO92 (Joggled Legs) molded plastic package with matte tin-plated terminals, UL 94V-0 rated, weighing ~200mg. Pin identification is verified per Diodes' flat-face view: Emitter (E), Collector (C), Base (B) - left-to-right when flat side faces viewer and leads point downward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| E (Emitter) | Current sink terminal | Connected to ground or return path; determines reference for base drive and current sensing |
| C (Collector) | High-voltage switch node | Interfaces directly with primary winding and snubber network; carries full mains-referred switching current |
| B (Base) | Control input | Receives current-limited drive signal; requires external resistor to limit IB ≤ 0.4A continuous |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 450V VCEO and 700V BVCES enable direct connection to rectified 230VAC line with margin |
| Lead-free & green compliance | RoHS 3 compliant with <900ppm Br/Cl and <1000ppm Sb; meets automotive change-control readiness |
| TO92 mechanical standardization | Joggled-leg TO92 footprint ensures compatibility with legacy PCB tooling and manual assembly processes |
| ESD robustness | 8kV HBM rating reduces risk of handling damage during board-level manufacturing and rework |
Applications
| Battery Charger for Smartphones | STB Power Supply |
|---|---|
Use Scenario: Compact wall adapter powering USB-charged smartphones with universal AC input (90–264VAC). IC Role / Device Role / Timing Role: Primary-side switching transistor in self-oscillating flyback converter, driven by transformer feedback winding. Use Value: 450V VCEO provides safety margin above 375V peak rectified voltage; 0.8A IC supports up to 8W output with derating. | Use Scenario: Standby and main power supply in set-top boxes requiring low no-load consumption and cost-sensitive BOM. IC Role / Device Role / Timing Role: Main switch in discontinuous conduction mode (DCM) flyback, controlled by discrete oscillator IC or transformer-coupled timing. Use Value: 0.5V VCE(sat) reduces conduction loss at light loads; TO92 simplifies thermal management without heatsink. |
| LED Lighting Driver | Low-Power AC-DC Adapter |
Use Scenario: Non-isolated buck-derived LED driver for downlight modules operating directly from rectified AC. IC Role / Device Role / Timing Role: High-side switch regulating average LED current via duty-cycle control in quasi-resonant topology. Use Value: 700V BVCES withstands line transients and ringing; 9V VEBO permits simple Zener-based base clamp. | Use Scenario: Universal-input AC-DC adapter for IoT sensors and smart home peripherals (<5W output). IC Role / Device Role / Timing Role: Primary switch in low-component-count flyback with integrated controller feedback via auxiliary winding. Use Value: 156.25°C/W RθJA enables reliable operation at 50°C ambient with minimal board copper; RoHS/green compliance meets regional regulations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJD2955G | PNP complement; 60V VCEO, 10A IC - lower voltage, higher current, opposite polarity | Not interchangeable; requires circuit redesign for PNP-based topology and lower voltage isolation | Select only if redesigning for complementary symmetry or lower-voltage DC-DC stage |
| 2SC4793 | NPN; 500V VCEO, 0.5A IC, TO126 package - higher voltage but lower current and larger footprint | Requires PCB layout change due to TO126 mounting; suitable where higher voltage margin outweighs size penalty | Prefer when >450V margin is mandatory and TO92 space constraint is relaxed |
Compared with MJD2955G and 2SC4793, APT27ZTR-G1 uniquely balances 450V blocking, 0.8A current, TO92 form factor, and RoHS/green compliance - making it optimal for cost-sensitive, space-constrained 5–10W AC-DC adapters where pin-compatible replacement is required.
Availability
APT27ZTR-G1 is available at Aetrix Electronics and suitable for battery charger design, STB power supply development, and LED lighting driver implementation requiring stable component supply despite its obsolete status.
Supply support for APT27ZTR-G1 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, serving industrial, computing, consumer, and communications markets.
APT27ZTR-G1 belongs to Diodes' high-voltage bipolar transistor product line, engineered specifically for reliability and manufacturability in low-power offline SMPS - emphasizing voltage robustness, thermal stability, and regulatory compliance.
FAQ
Is APT27ZTR-G1 still in active production?
No - Diodes Incorporated has officially discontinued APT27ZTR-G1, marking it "OBSOLETE" in DS36301 Rev. 3-4 (June 2021). Aetrix Electronics maintains limited legacy stock with full traceability and offers lifecycle coordination support for ongoing production programs.
Can APT27ZTR-G1 be used in AEC-Q101 qualified automotive designs?
APT27ZTR-G1 itself is not AEC-Q101 qualified. However, Diodes states that automotive-grade versions with AEC-Q101 qualification, PPAP capability, and IATF 16949 manufacturing are available upon request - contact Diodes or Aetrix for qualified alternatives meeting automotive change control requirements.
What is the correct pinout orientation for TO92 mounting?
With the flat face oriented toward the viewer and leads pointing downward, the left-to-right pin order is Emitter (E), Collector (C), Base (B). This matches Diodes' official TO92 Type C outline and is confirmed in the "Flat Face View" diagram on page 4 of DS36301.
Does APT27ZTR-G1 require a heatsink in typical SMPS operation?
No - with a rated PD of 0.8W and RθJA of 156.25°C/W, APT27ZTR-G1 operates within safe junction temperature limits (<150°C) at ambient temperatures ≤50°C using only PCB copper pour, provided peak power dissipation remains below 0.5W in DCM flyback operation.
APT27ZTR-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 800 mA
- Voltage - Collector Emitter Breakdown (Max):
- 450 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 40mA, 200mA
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 15 @ 100mA, 10V
- Power - Max:
- 800 mW
- Frequency - Transition:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
APT27ZTR-G1 FAQ
1.How can I place an order for APT27ZTR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for APT27ZTR-G1 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 APT27ZTR-G1 reliable?
The price and inventory of APT27ZTR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for APT27ZTR-G1 is usually 5 days.
3.What payment methods are accepted for APT27ZTR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for APT27ZTR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for APT27ZTR-G1?
APT27ZTR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your APT27ZTR-G1 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 APT27ZTR-G1?
For technical support, including APT27ZTR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your APT27ZTR-G1 requirements.
6.How does Aetrix verify that APT27ZTR-G1 is sourced from the original manufacturer or authorized distributors?
All APT27ZTR-G1 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 APT27ZTR-G1 meets industry standards.
7.What is the process for return or replacement of APT27ZTR-G1?
All APT27ZTR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with APT27ZTR-G1, 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 APT27ZTR-G1 part is unused and in its original packaging.
Return procedure for APT27ZTR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
APT27ZTR-G1 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
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
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…
