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onsemi 1N5337B
- Part No.:
- 1N5337B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5337B.pdf
- Description:
- DIODE ZENER 4.7V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:6,937
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Product details
Overview
1N5337B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 4.7 V, ±5% tolerance, maximum zener impedance of 260 Ω at 2 mA test current, and surge rating of 1010 A at 8.3 ms. It operates as a precision voltage reference or shunt regulator in low-voltage power supply feedback paths, overvoltage protection circuits, and voltage-clamping applications.
For engineers reviewing the 1N5337B datasheet, pinout, applications, or equivalent options, key selection criteria include its 4.7 V nominal regulation, 260 Ω dynamic impedance at IZT = 2 mA, 0.44 µA leakage at VR = 3.8 V, thermal resistance of 25 °C/W (junction-to-lead), and Pb-free Surmetic 40 plastic package compatibility with wave and reflow soldering.
Technical Context
The 1N5337B employs a silicon-oxide passivated junction for stable zener breakdown and low leakage. Its regulation performance is specified at two test currents - IZT = 2 mA (for nominal VZ and ZZT) and IZK = 1 mA (for knee impedance ZZK = 450 Ω) - enabling accurate modeling across operating ranges.
Thermal design relies on lead-to-ambient conduction: junction-to-lead resistance is fixed at 25 °C/W, and maximum steady-state power dissipation is 5 W at TL = 25°C with 3/8″ lead length, derating linearly above that temperature. Polarity is marked by a cathode band; mounting position is unrestricted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.7 V ±5% - defines regulated output voltage under 2 mA test current; actual unit may range 4.47–4.94 V. |
| Zener Impedance @ IZT | 260 Ω max at IZT = 2 mA - determines regulation stiffness; lower values improve load/line transient response. |
| Max DC Zener Current | 1010 mA - derived from 5 W / 4.94 V (max VZ); sets absolute upper limit for continuous operation. |
| Leakage Current @ VR | 0.44 µA max at VR = 3.8 V - ensures minimal error current in high-impedance bias networks. |
| Surge Current Rating | 1010 A peak @ 8.3 ms - supports transient overvoltage suppression without failure in pulse-limited conditions. |
| Junction-to-Lead Rθ | 25 °C/W - enables thermal calculation of junction temperature rise above lead temperature for reliability analysis. |
| ESD Rating | Class 3 (>16 kV HBM) - provides robust handling during board assembly and field service without external protection. |
Pinout & Package
Package: Axial-lead Surmetic 40 plastic case (JEDEC CASE 017AA), void-free transfer-molded thermosetting material; cathode indicated by single band; leads corrosion-resistant and solderable; max solder temperature 260°C at 1/16″ from case for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to circuit ground or lower-potential rail; forms reference point for regulated voltage at cathode. |
| Cathode | Zener breakdown terminal / regulated output node | Delivers stable 4.7 V relative to anode when reverse-biased above breakdown; polarity band identifies this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Zener voltage tolerance | ±5% (JEDEC B-suffix) - enables predictable regulation without post-manufacture trimming in cost-sensitive designs. |
| Surge capability | 1010 A @ 8.3 ms - allows use in unregulated input stages exposed to lightning-induced transients or inductive kickback. |
| Low leakage current | 0.44 µA @ 3.8 V - minimizes error in precision reference dividers and high-Z sensor biasing networks. |
| Pb-free compliance | RoHS-compliant Surmetic 40 package - meets global environmental regulations without sacrificing thermal or mechanical performance. |
| Stable oxide-passivated junction | Guaranteed limits on six electrical parameters - ensures batch-to-batch consistency in VZ, ZZT, IR, and surge performance. |
Applications
| Power Supply Feedback Regulation | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Stabilizing output voltage in linear regulators or switching converter feedback loops where low-cost, discrete reference is required. IC Role / Device Role / Timing Role: Shunt voltage reference connected between output and error amplifier input; sinks excess current to maintain setpoint. Use Value: Delivers 4.7 V reference with 260 Ω dynamic impedance, ensuring <1% output deviation under 10–90% load steps in 12 V input systems. |
Use Scenario: Protecting microcontroller I/O pins or analog front-ends from ESD or transient overvoltage events exceeding 5 V. IC Role / Device Role / Timing Role: Bidirectional clamping device placed between signal line and ground; conducts only when voltage exceeds 4.7 V + VF. Use Value: Limits transient excursions to ≤5.9 V (4.7 V + 1.2 V forward drop) while surviving 1010 A surges per IEC 61000-4-5 Level 4 requirements. |
| Low-Voltage Reference Divider | Current-Limited Bias Source |
Use Scenario: Generating precise sub-5 V reference for ADCs, comparators, or op-amp biasing in battery-powered instrumentation. IC Role / Device Role / Timing Role: Stable voltage node in resistive divider network; supplies low-current reference to high-impedance inputs. Use Value: Provides 4.7 V ±5% with 0.44 µA leakage, contributing <0.01% error to 1 MΩ divider arms and enabling 12-bit accuracy at 3.3 V full-scale. |
Use Scenario: Biasing LED drivers or transistor bases where constant current must be maintained despite supply variation. IC Role / Device Role / Timing Role: Constant-voltage element in series with current-setting resistor; regulates voltage drop to fix current. Use Value: Enables 10 mA bias current with ±2% stability over 9–15 V input range using 470 Ω resistor, leveraging tight VZ tolerance and low ZZT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5336B | Nominal VZ = 4.3 V (min 4.09 V, max 4.52 V); ZZT = 290 Ω @ 2 mA; leakage = 0.49 µA @ 3.5 V | Slightly lower regulation voltage; higher impedance reduces regulation accuracy under dynamic loads | Select when 4.3 V reference is acceptable and tighter VZ tolerance is less critical than cost |
| 1N5338B | Nominal VZ = 5.1 V (min 4.85 V, max 5.36 V); ZZT = 240 Ω @ 1.5 mA; leakage = 0.39 µA @ 4.1 V | Higher nominal voltage; lower impedance improves regulation but requires redesign of feedback or clamp thresholds | Choose for 5.1 V systems needing lower dynamic impedance and reduced leakage, accepting layout revision |
Compared with 1N5337B, 1N5336B offers lower voltage and marginally higher impedance, making it suitable for legacy 4.3 V references, while 1N5338B delivers tighter regulation at 5.1 V with better noise rejection - both require verification of VZ tolerance impact on system accuracy and thermal margin under worst-case IZM.
Availability
1N5337B is available at Aetrix Electronics and suitable for power supply feedback regulation, overvoltage clamp protection, and low-voltage reference divider applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for 1N5337B 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 (Semiconductor Components Industries, LLC) is a global semiconductor supplier focused on energy-efficient electronics, delivering high-performance analog, logic, discrete, and custom devices.
The 1N53 Series is part of onsemi's legacy Zener portfolio designed for general-purpose voltage regulation, offering tight tolerances, high surge robustness, and reliable performance in industrial, automotive, and consumer power systems.
FAQ
What is the nominal zener voltage and tolerance of the 1N5337B?
The 1N5337B has a nominal zener voltage of 4.7 V with a ±5% tolerance, meaning its actual measured voltage at IZT = 2 mA falls within the 4.47 V to 4.94 V range. This tolerance is guaranteed per JEDEC standard for B-suffix devices and is validated during production testing across all electrical parameters including VZ, ZZT, and IR.
What is the maximum continuous zener current for the 1N5337B?
The maximum DC zener current for the 1N5337B is 1010 mA, calculated as 5 W (maximum steady-state power) divided by the maximum possible zener voltage (4.94 V). This value assumes TL = 25°C and 3/8″ lead length; derating applies above ambient temperature per the 40 mW/°C spec.
How does the 1N5337B perform under transient surge conditions?
The 1N5337B supports a peak non-repetitive surge current of 1010 A at 8.3 ms pulse width, verified per Figure 5 of the onsemi datasheet. This capability enables use in primary-side transient suppression without external TVS diodes, provided pulse duty cycle remains low and thermal recovery time is observed between events.
Is the 1N5337B compatible with lead-free soldering processes?
Yes, the 1N5337B is offered in a Pb-free Surmetic 40 package (indicated by "G" suffix in ordering codes) and rated for maximum lead temperature of 260°C at 1/16″ from case for 10 seconds - fully compliant with IPC-J-STD-020 moisture sensitivity and lead-free reflow profiles.
What is the zener impedance of the 1N5337B and why does it matter?
The 1N5337B has a maximum zener impedance of 260 Ω at IZT = 2 mA. This parameter quantifies how much the output voltage changes with current variation - lower ZZT means tighter regulation under dynamic load conditions, critical for maintaining accuracy in feedback loops and reference networks.
1N5337B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 4.7 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 1 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
1N5337B FAQ
1.How can I place an order for 1N5337B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5337B 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 1N5337B reliable?
The price and inventory of 1N5337B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5337B is usually 5 days.
3.What payment methods are accepted for 1N5337B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5337B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5337B?
1N5337B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5337B 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 1N5337B?
For technical support, including 1N5337B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5337B requirements.
6.How does Aetrix verify that 1N5337B is sourced from the original manufacturer or authorized distributors?
All 1N5337B 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 1N5337B meets industry standards.
7.What is the process for return or replacement of 1N5337B?
All 1N5337B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5337B, 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 1N5337B part is unused and in its original packaging.
Return procedure for 1N5337B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5337B Tags
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