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onsemi 1N4745A_T50R
- Part No.:
- 1N4745A_T50R
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-204AL, DO-41, Axial
- Datasheet:
-
1N4745A_T50R.pdf
- Description:
- DIODE ZENER 16V 1W DO41
- Quantity:
- Payment:
- Shipping:
Inventory:4,407
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Product details
Overview
1N4745A_T50R from onsemi is a 16 V, 1 W silicon Zener diode in DO-41 glass package, rated for ±5% tolerance at 16 mA test current, with 15.5 Ω dynamic impedance and 0.25 µA leakage at 12.2 V reverse voltage. It regulates voltage in low-power DC supplies and reference circuits.
For engineers reviewing the 1N4745A_T50R datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage accuracy, thermal derating (6.67 mW/°C above 50°C), junction temperature range (–65°C to +200°C), and DO-41 mechanical compatibility.
Technical Context
The 1N4745A_T50R operates as a two-terminal voltage reference device, maintaining stable reverse-biased breakdown at nominal 16 V across its cathode-anode terminals. Its Zener mechanism provides predictable regulation under controlled current conditions (IZ = 16 mA) and defined thermal boundary (TL ≤ 50°C).
It exhibits 15.5 Ω dynamic impedance (ZZ @ IZ) and 22 Ω knee impedance (ZZK @ IZK = 1.6 mA), supporting precision referencing where low AC impedance matters. The 0.25 µA leakage current at VR = 12.2 V ensures minimal error in high-impedance bias networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.2–16.8 V at 16 mA - defines regulated output voltage window under nominal bias |
| Power Dissipation (PD) | 1.0 W @ TL ≤ 50°C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZ) | 15.5 Ω @ IZ = 16 mA - determines AC voltage variation under changing load current |
| Leakage Current (IR) | 0.25 µA @ VR = 12.2 V - limits error in high-resistance divider or bias networks |
| Operating Temp Range | –65°C to +200°C - supports industrial, automotive under-hood, and aerospace environments |
| Thermal Derating | 6.67 mW/°C above 50°C - requires heatsinking or power reduction in elevated ambient conditions |
Pinout & Package
DO-41 glass axial package with cathode indicated by a single black band. Leads are tinned copper-clad steel; body diameter 2.0–2.7 mm, length 4.4–7.0 mm, lead diameter 0.4–0.6 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit common when used in shunt regulation; carries full load current during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input supply via series resistor; maintains stable voltage relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Enables use without post-calibration in cost-sensitive 16 V reference designs |
| 1.0 W power rating | Supports up to ~62 mA max Zener current (16 V × 62 mA ≈ 1 W), sufficient for most analog references |
| Low 15.5 Ω dynamic impedance | Minimizes output voltage shift under ±10 mA load transients in feedback or sensing paths |
| –65°C to +200°C operating range | Validates suitability for extended-temperature applications including engine control and downhole electronics |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing unregulated 24 V rail to generate clean 16 V for op-amp biasing in industrial sensor modules. IC Role / Device Role / Timing Role: Shunt voltage regulator providing fixed reference against which series pass element adjusts. Use Value: Delivers 16 V ±0.8 V over temperature without active feedback, reducing BOM count vs. IC regulator. |
Use Scenario: Clamping transient spikes on 12 V CAN bus lines during ESD events or load dump. IC Role / Device Role / Timing Role: Passive crowbar protecting downstream transceivers from >16 V excursions. Use Value: Responds within nanoseconds to limit voltage to 16.8 V peak, preventing latch-up in 12 V-rated ICs. |
| ADC Reference Source | Microcontroller Reset Threshold |
Use Scenario: Providing stable 16 V reference for 12-bit SAR ADC in battery-powered data loggers. IC Role / Device Role / Timing Role: Precision voltage source feeding resistive divider that scales input to ADC full-scale range. Use Value: 0.25 µA leakage ensures <0.1 LSB error contribution in 1 MΩ input impedance designs. |
Use Scenario: Generating reset signal threshold for 16 V brown-out detection in automotive MCU power management. IC Role / Device Role / Timing Role: Voltage monitor element triggering external supervisor IC when supply drops below 15.2 V. Use Value: Tight 5% tolerance ensures deterministic reset activation across –40°C to +125°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4745A | Same electrical specs and DO-41 package; T50R suffix denotes tape-and-reel packaging per EIA-481-D standard. | No functional difference; identical performance in PCB layout and thermal design. | Select 1N4745A_T50R for automated SMT placement; choose bulk 1N4745A for hand-solder prototyping. |
| BZX55C16 | 16 V, ±5%, 500 mW rating, DO-35 package; higher ZZ (20 Ω) and narrower temp range (–65°C to +175°C). | Limited to lower-power applications due to 0.5 W rating; smaller DO-35 footprint may require layout change. | Choose BZX55C16 only if space-constrained and power demand stays below 31 mA at 16 V. |
Compared with 1N4745A_T50R, the 1N4745A offers identical performance in different packaging, while BZX55C16 trades 50% lower power rating and higher impedance for smaller size-making 1N4745A_T50R optimal for robust 1 W regulation where DO-41 fit is acceptable.
Availability
1N4745A_T50R is available at Aetrix Electronics and suitable for industrial power supplies, automotive sensor interfaces, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N4745A_T50R 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, serving automotive, industrial, cloud, and consumer markets with discrete, analog, and logic solutions.
The 1N47xxA series was designed specifically for general-purpose Zener regulation in cost-sensitive, high-reliability applications-emphasizing tight voltage tolerance, wide temperature operation, and DO-41 mechanical ruggedness.
FAQ
What is the Zener voltage tolerance of the 1N4745A_T50R?
The 1N4745A_T50R has a ±5% Zener voltage tolerance, meaning its nominal 16 V breakdown occurs between 15.2 V and 16.8 V at 16 mA test current and 25°C. This tolerance remains valid across the full operating temperature range of –65°C to +200°C, as confirmed in the onsemi 1N4728A–1N4758A datasheet Rev. 8.
Can the 1N4745A_T50R be used in surface-mount designs?
No-the 1N4745A_T50R uses a DO-41 axial glass package with radial leads intended for through-hole mounting. It is not compatible with SMT reflow processes. For SMT alternatives, consider SOD-123 or SOD-323 packaged Zeners like MMBZ5245B, but note differences in power rating and impedance versus the 1N4745A_T50R.
What is the maximum reverse leakage current for the 1N4745A_T50R?
The 1N4745A_T50R specifies a maximum reverse leakage current of 0.25 µA at VR = 12.2 V and 25°C. This value is measured prior to Zener breakdown and ensures minimal current draw in high-impedance bias networks where the 1N4745A_T50R serves as a reference node.
How does thermal derating affect the 1N4745A_T50R's power handling?
The 1N4745A_T50R is rated for 1.0 W only when lead temperature (TL) is ≤ 50°C. Above that, power must be reduced linearly at 6.67 mW/°C. At TL = 100°C, maximum dissipation drops to 0.667 W. Proper lead length (3/8″) and board thermal relief are required to meet this spec in the 1N4745A_T50R's thermal model.
Is the 1N4745A_T50R RoHS compliant and halogen-free?
Yes-the 1N4745A_T50R meets RoHS Directive 2011/65/EU and is halogen-free per onsemi's material declarations. The DO-41 glass package contains no lead in solderable terminations, and all materials comply with JEDEC J-STD-609A Class 1 moisture sensitivity level (MSL) requirements for the 1N4745A_T50R.
1N4745A_T50R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-204AL, DO-41, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 16 V
- Tolerance:
- ±5%
- Power - Max:
- 1 W
- Impedance (Max) (Zzt):
- 16 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 12.2 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-41
1N4745A_T50R FAQ
1.How can I place an order for 1N4745A_T50R through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N4745A_T50R 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 1N4745A_T50R reliable?
The price and inventory of 1N4745A_T50R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N4745A_T50R is usually 5 days.
3.What payment methods are accepted for 1N4745A_T50R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N4745A_T50R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N4745A_T50R?
1N4745A_T50R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N4745A_T50R 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 1N4745A_T50R?
For technical support, including 1N4745A_T50R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N4745A_T50R requirements.
6.How does Aetrix verify that 1N4745A_T50R is sourced from the original manufacturer or authorized distributors?
All 1N4745A_T50R 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 1N4745A_T50R meets industry standards.
7.What is the process for return or replacement of 1N4745A_T50R?
All 1N4745A_T50R units undergo pre-shipment inspection (PSI). If there is an issue with 1N4745A_T50R, 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 1N4745A_T50R part is unused and in its original packaging.
Return procedure for 1N4745A_T50R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N4745A_T50R Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
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