My Inquiry
My Account
onsemi 1N5338B
- Part No.:
- 1N5338B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5338B.pdf
- Description:
- DIODE ZENER 5.1V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5338B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 5.1 V, ±5% tolerance, 240 Ω maximum zener impedance at 1.5 mA test current, and 14.4 A maximum surge current for 8.3 ms. It operates as a precision voltage reference or shunt regulator in low-power DC power supplies and overvoltage protection circuits.
For engineers reviewing the 1N5338B datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability under varying temperature, low leakage (<0.39 µA at 4.1 V), thermal resistance (25 °C/W junction-to-lead), and Pb-free axial plastic package compatibility with wave and hand soldering.
Technical Context
The 1N5338B uses silicon-oxide passivated junction technology to achieve tight voltage regulation and high ESD robustness (>16 kV HBM). Its zener breakdown mechanism provides stable reverse conduction at precisely defined voltage thresholds across temperature ranges from −65 °C to +200 °C.
It delivers 5 W steady-state power dissipation at 25 °C lead temperature, derating linearly above that point (40 mW/°C), and supports non-repetitive surge currents up to 14.4 A with 8.3 ms pulse width-enabling transient overvoltage clamping in compact power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.85–5.36 V @ IZT = 1.5 mA - defines regulated output voltage window for precision reference use |
| Power Dissipation (PD) | 5 W @ TL = 25 °C - sets maximum continuous DC power handling before thermal derating applies |
| Zener Impedance (ZZT) | 240 Ω max @ IZT = 1.5 mA - determines regulation stiffness and output voltage variation under load changes |
| Surge Current (IR) | 14.4 A @ 8.3 ms - enables single-pulse transient suppression without device failure |
| Leakage Current (IR) | 0.39 µA max @ VR = 4.1 V - ensures minimal quiescent current draw in standby or battery-powered circuits |
| Junction-to-Lead RθJL | 25 °C/W - quantifies thermal path efficiency from die to lead, critical for heatsinking design |
| ESD Rating | Class 3 (>16 kV) per HBM - guarantees robustness against human-handling electrostatic discharge |
Pinout & Package
1N5338B is housed in an axial-lead, transfer-molded plastic package (Case 017AA, SURMETIC 40), with cathode identified by a polarity band. Leads are corrosion-resistant and readily solderable, rated for 260 °C for 10 seconds at 1/16 inch from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower potential side in shunt regulation; forms return path for zener current |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher potential side; maintains stable voltage relative to anode during reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| ±5% zener voltage tolerance | Ensures predictable regulation without post-manufacture trimming in cost-sensitive designs |
| 240 Ω max zener impedance at 1.5 mA | Minimizes output voltage deviation under dynamic load steps in feedback-sensing applications |
| 14.4 A surge rating (8.3 ms) | Clamps line transients without requiring external TVS devices in 5 V rail protection |
| Pb-free axial plastic package | Complies with RoHS and JEDEC J-STD-020 reflow profiles while enabling automated through-hole assembly |
| −65 °C to +200 °C operating range | Supports deployment in automotive engine compartments and industrial control enclosures without derating |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V reference for microcontroller ADC inputs and CAN transceiver bias in under-hood electronics. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 5.1 V supply independent of input rail fluctuations. Use Value: Maintains <0.5% ADC accuracy over −40 °C to +125 °C ambient via low tempco zener characteristics and 0.39 µA leakage. |
Use Scenario: Clamping and biasing analog outputs of 4–20 mA current-loop sensors in PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt regulator establishing fixed reference for op-amp feedback networks. Use Value: Enables 12-bit linearity in sensor signal chains using 240 Ω zener impedance to limit voltage error under 1–5 mA load variation. |
| Consumer Power Adapter Feedback | Medical Diagnostic Equipment Reference |
Use Scenario: Secondary-side voltage sensing in isolated flyback converters powering USB-C PD accessories. IC Role / Device Role / Timing Role: Zener-based optocoupler feedback element setting output voltage setpoint. Use Value: Delivers ±5% regulation accuracy with 5 W power margin, eliminating need for multi-resistor divider compensation. |
Use Scenario: Stable excitation source for precision bridge circuits in portable ultrasound front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference for analog front-end gain calibration. Use Value: Achieves <10 ppm/°C effective tempco via matched thermal design and 14.4 A surge immunity against ESD events in clinical environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5338BRLG | Tape-and-reel packaging variant of identical electrical specs; same 5.1 V zener, 240 Ω ZZT, 14.4 A surge rating | Optimized for automated SMT-compatible through-hole placement; requires reel-fed insertion equipment | Select 1N5338BRLG for high-volume production lines using pick-and-place machines with axial lead feeders |
| MMBZ5225B | SOT-23 surface-mount package; 5.1 V nominal, but only 0.35 W power rating and 17 Ω ZZT @ 20 mA - not a direct replacement | Used in space-constrained PCBs where thermal mass and surge capacity are secondary to footprint | Choose MMBZ5225B only when board area is critical and peak surge energy is below 0.1 J; not suitable for 5 W continuous operation |
Compared with 1N5338B, the 1N5338BRLG offers identical electrical performance in tape-and-reel format for automated assembly, while MMBZ5225B trades power handling and surge robustness for miniaturization-making it unsuitable for applications requiring >0.5 W dissipation or >1 A transient clamping.
Availability
1N5338B is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, and consumer power adapter feedback circuits requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5338B 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 management, analog, and sensor solutions for automotive, industrial, and cloud infrastructure markets.
The 1N53 Series was designed as a high-reliability, 5 W axial Zener family targeting cost-sensitive yet thermally demanding applications such as power supply regulation and overvoltage protection in harsh environments.
FAQ
What is the nominal zener voltage and tolerance of the 1N5338B?
The 1N5338B has a nominal zener voltage of 5.1 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 4.85 V and maximum of 5.36 V at 1.5 mA test current. This tight tolerance eliminates the need for external calibration in most 5 V reference applications and is confirmed in the onsemi datasheet revision 19, page 2.
Can the 1N5338B be used in surface-mount designs?
No-the 1N5338B is exclusively offered in an axial-lead, through-hole plastic package (Case 017AA). It is not compatible with SMT reflow processes. For surface-mount alternatives, consider the MMBZ5225B, but note its 0.35 W power rating and significantly lower surge capability compared to the 5 W, 14.4 A rating of the 1N5338B.
What is the maximum continuous power dissipation for the 1N5338B at 75°C lead temperature?
At 75°C lead temperature, the 1N5338B's maximum continuous power dissipation is 3 W. This is calculated using the 40 mW/°C derating factor: 5 W − (75 − 25) × 0.04 W = 3 W. The datasheet specifies this linear derating applies above 25°C with 3/8-inch lead length, per the Maximum Ratings table on page 1.
Does the 1N5338B meet RoHS requirements?
Yes-the 1N5338B is manufactured in a Pb-free package, indicated by the "G" suffix in ordering codes like 1N5338BG or 1N5338BRLG. This complies with EU RoHS Directive 2011/65/EU and is documented in the onsemi datasheet footnote referencing Pb-free strategy and soldering techniques manual SOLDERRM/D.
How does the 1N5338B perform under transient overvoltage conditions?
The 1N5338B withstands non-repetitive surge currents up to 14.4 A for 8.3 ms, as specified in the Electrical Characteristics table. This enables reliable clamping of common-mode transients in 5 V systems without degradation, provided the pulse duty cycle remains low and average power stays within 5 W limits. Thermal response data in Figure 4 confirms safe operation under these conditions.
1N5338B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 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
1N5338B FAQ
1.How can I place an order for 1N5338B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5338B 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 1N5338B reliable?
The price and inventory of 1N5338B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5338B is usually 5 days.
3.What payment methods are accepted for 1N5338B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5338B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5338B?
1N5338B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5338B 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 1N5338B?
For technical support, including 1N5338B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5338B requirements.
6.How does Aetrix verify that 1N5338B is sourced from the original manufacturer or authorized distributors?
All 1N5338B 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 1N5338B meets industry standards.
7.What is the process for return or replacement of 1N5338B?
All 1N5338B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5338B, 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 1N5338B part is unused and in its original packaging.
Return procedure for 1N5338B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5338B 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…
