My Inquiry
My Account
onsemi 1N5366B
- Part No.:
- 1N5366B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5366B.pdf
- Description:
- DIODE ZENER 39V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,305
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5366B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 39 V, ±5% tolerance, maximum zener impedance of 30 Ω at 14 mA test current, and surge rating of 170 A at 8.3 ms. It operates across −65 °C to +200 °C and delivers stable voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage sources.
For engineers reviewing the 1N5366B datasheet, pinout, applications, or equivalent options, key selection criteria include its 39 V nominal zener voltage, 30 Ω dynamic impedance at IZT = 14 mA, 170 A non-repetitive surge capability, thermal resistance of 25 °C/W (junction-to-lead), and Pb-free Surmetic 40 plastic package with cathode band polarity marking.
Technical Context
The 1N5366B employs a silicon-oxide passivated junction for improved stability and low leakage. Its zener voltage is specified at IZT = 14 mA with tight ±5% tolerance and temperature coefficient of +0.085 mV/°C (typical for 39 V units), enabling predictable drift compensation in precision references.
It supports DC and pulsed operation up to 200 °C junction temperature under short-duration conditions, with thermal resistance θJL = 25 °C/W at 3/8″ lead length. The device meets Class 3 ESD rating (>16 kV HBM) and withstands 180 W transient surges per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 39 V - precise regulation point for mid-range voltage references and clamp thresholds |
| Zener Tolerance | ±5% - ensures predictable VZ variation across production lots without binning |
| Zener Impedance | 30 Ω max @ IZT = 14 mA - low dynamic resistance maintains regulation accuracy under load transients |
| Max Surge Current | 170 A @ 8.3 ms - handles high-energy transients in industrial power rails and input protection stages |
| Power Dissipation | 5 W @ TL = 25 °C - enables compact thermal design with minimal heatsinking in 3/8″ lead-mount configurations |
| Junction-to-Lead Rθ | 25 °C/W - defines thermal path efficiency for lead-mounted PCB layouts and derating calculations |
| Leakage Current | 0.65 mA max @ VR = 29.7 V - low IR ensures minimal quiescent error in high-impedance bias networks |
Pinout & Package
Package: Axial-lead Surmetic 40 plastic case (JEDEC Case 017AA), void-free transfer-molded thermosetting material, cathode indicated by colored band, RoHS-compliant Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit common or lower-potential node; reverse-biased during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 39 V reference when reverse-biased above VZ; marked with band |
Key Features
| Feature | Design Value |
|---|---|
| Silicon-oxide passivated junction | Enables stable long-term VZ drift (<0.1%/1000 h) and low noise in analog references |
| Class 3 ESD rating (>16 kV HBM) | Eliminates need for external ESD protection in board-level handling and assembly environments |
| 180 W surge rating @ 8.3 ms | Withstands lightning-induced transients and inductive kickback without degradation |
| −65 °C to +200 °C operating range | Supports deployment in automotive engine compartments and industrial motor drives |
| Maximum six-parameter guarantee | Ensures conformance on VZ, ZZT, ZZK, IZK, IR, and IZM - reduces incoming inspection burden |
Applications
| Industrial Power Supply Feedback | Overvoltage Clamp for DC Bus |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Zener reference element setting upper threshold for TL431 or optocoupler LED drive current. Use Value: 39 V nominal VZ provides margin above 36 V nominal rail while maintaining <30 Ω impedance for fast loop response. |
Use Scenario: Protecting 48 V DC distribution systems against transient overvoltage events. IC Role / Device Role / Timing Role: Shunt clamping device diverting surge energy to ground before downstream components exceed ratings. Use Value: 170 A peak surge current rating absorbs 8.3 ms transients without failure, preserving system uptime. |
| Precision Voltage Reference | Microcontroller Reset Circuit |
Use Scenario: Generating stable 39 V reference for ADC calibration or DAC output scaling in test equipment. IC Role / Device Role / Timing Role: Primary voltage reference source feeding resistive divider or op-amp buffer stage. Use Value: ±5% tolerance and <0.085 mV/°C tempco enable sub-0.5% total error over −40 °C to +85 °C ambient. |
Use Scenario: Enabling brown-out detection and controlled reset assertion in 3.3 V or 5 V microcontroller systems. IC Role / Device Role / Timing Role: Threshold-setting component in RC-based reset generator or discrete supervisor circuit. Use Value: Low 0.65 mA leakage at 29.7 V ensures reliable reset release timing without capacitor discharge errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5366BRLG | Same electrical specs; tape-and-reel packaging (4000 pcs/reel) vs. box (1000 pcs) | No functional difference; optimized for automated SMT placement rather than manual/hand-soldered prototyping | Select 1N5366BRLG for high-volume production lines requiring pick-and-place compatibility |
| BZX85C39 | 1.3 W rating, 39 V ±5%, 100 Ω Zener impedance @ 5 mA - lower power and higher impedance than 1N5366B | Suitable only for low-current biasing or signal-level clamping; cannot replace 1N5366B in 5 W power regulation roles | Choose BZX85C39 only where power dissipation remains below 1.3 W and dynamic impedance requirements are relaxed |
Compared with 1N5366B, the 1N5366BRLG offers identical regulation performance with logistics optimization for automated assembly, while BZX85C39 serves lower-power applications but lacks the 5 W capability and 30 Ω impedance needed for robust power-stage referencing.
Availability
1N5366B is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, precision voltage references, and microcontroller reset systems requiring stable component supply and long-term obsolescence management.
Supply support for 1N5366B 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 specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N53 Series was designed as a high-reliability, 5 W Zener regulator family targeting demanding power management and protection applications where stability, surge resilience, and wide temperature operation are critical.
FAQ
What is the nominal zener voltage and tolerance of the 1N5366B?
The 1N5366B has a nominal zener voltage of 39 V with a guaranteed tolerance of ±5%, meaning its actual zener voltage falls between 37.05 V and 40.95 V at the specified test current of 14 mA. This tolerance is defined per JEDEC standards and applies to all B-suffix devices in the 1N53 series. The 1N5366B achieves this specification using silicon-oxide passivated junction technology for consistent performance across production lots.
What is the maximum power dissipation and thermal resistance of the 1N5366B?
The 1N5366B is rated for 5 W steady-state power dissipation at a lead temperature (TL) of 25 °C with 3/8″ lead length, and features a junction-to-lead thermal resistance (θJL) of 25 °C/W. Derating is required above 25 °C at 40 mW/°C. These values are measured under standardized mounting conditions and define the thermal boundary for safe continuous operation. The 1N5366B must be mounted with leads at least 3/8″ from the case to meet these ratings.
Does the 1N5366B have surge protection capability, and what is its rating?
Yes, the 1N5366B supports non-repetitive surge currents up to 170 A for an 8.3 ms square-wave pulse, corresponding to a peak surge power of 180 W. This rating is validated per JEDEC test methods and reflects the device's ability to absorb transient energy without parametric shift or failure. The 1N5366B leverages its 5 W power-handling architecture and robust silicon junction to deliver this level of transient immunity in real-world power-line and motor-drive applications.
What is the zener impedance of the 1N5366B, and why does it matter?
The 1N5366B has a maximum zener impedance (ZZT) of 30 Ω at its test current (IZT) of 14 mA. This low dynamic impedance ensures minimal output voltage variation under changing load conditions - critical for maintaining regulation accuracy in feedback loops and reference circuits. Lower ZZT directly improves line and load regulation performance, making the 1N5366B suitable for applications where voltage stability under transient current demand is essential.
Is the 1N5366B RoHS-compliant and what package type does it use?
Yes, the 1N5366B is RoHS-compliant and supplied in a Pb-free Surmetic 40 axial-lead plastic package (JEDEC Case 017AA). The package uses void-free, transfer-molded thermosetting plastic with corrosion-resistant, solderable leads and cathode polarity indicated by a band. Maximum soldering temperature is 260 °C for 10 seconds at 1/16″ from the case. The 1N5366B meets environmental compliance requirements without sacrificing mechanical robustness or thermal performance.
1N5366B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 39 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 14 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 29.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 200°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- Axial
1N5366B FAQ
1.How can I place an order for 1N5366B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5366B 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 1N5366B reliable?
The price and inventory of 1N5366B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5366B is usually 5 days.
3.What payment methods are accepted for 1N5366B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5366B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5366B?
1N5366B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5366B 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 1N5366B?
For technical support, including 1N5366B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5366B requirements.
6.How does Aetrix verify that 1N5366B is sourced from the original manufacturer or authorized distributors?
All 1N5366B 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 1N5366B meets industry standards.
7.What is the process for return or replacement of 1N5366B?
All 1N5366B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5366B, 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 1N5366B part is unused and in its original packaging.
Return procedure for 1N5366B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5366B 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
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
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…
