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onsemi 1N5348B
- Part No.:
- 1N5348B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5348B.pdf
- Description:
- DIODE ZENER 11V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:7,649
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Product details
Overview
1N5348B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 11.0 V (±5%), maximum zener impedance of 125 Ω at 2.5 mA test current, and reverse leakage current ≤0.25 mA at 8.0 V. It operates across −65 °C to +200 °C and delivers stable voltage regulation in power supply reference and overvoltage protection circuits.
For engineers reviewing the 1N5348B datasheet, pinout, applications, or equivalent options, key selection criteria include its 11.0 V regulation tolerance, 125 Ω dynamic impedance, 430 A surge rating at 8.3 ms, thermal resistance of 25 °C/W (junction-to-lead), and Pb-free Surmetic 40 plastic package compatibility with automated assembly.
Technical Context
The 1N5348B employs a silicon-oxide passivated junction for enhanced stability and low leakage. Its zener voltage is specified at IZT = 2.5 mA with tight ±5% tolerance and exhibits a positive temperature coefficient above 10 V - confirmed as +8.4 mV/°C per Figure 2.
It supports non-repetitive surge currents up to 430 A (8.3 ms square wave) and maintains regulation under DC dissipation up to 5 W at TL = 25 °C, derating linearly above that temperature at 40 mW/°C. The device's cathode band polarity and axial lead configuration are standardized per CASE 017AA mechanical outline.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.45–11.55 V @ IZT = 2.5 mA - ensures precise 11.0 V reference within ±5% tolerance for feedback loops |
| Zener Impedance (ZZT) | 125 Ω max @ IZT = 2.5 mA - limits output voltage variation under load transients |
| Max Power Dissipation | 5 W @ TL = 25 °C - defines absolute steady-state thermal limit before derating begins |
| Junction-to-Lead RθJL | 25 °C/W - enables thermal modeling when leads are mounted to heatsinks or PCB copper |
| Surge Current (IR) | 430 A @ 8.3 ms - withstands high-energy transient events without degradation |
| Reverse Leakage (IR) | ≤0.25 mA @ VR = 8.0 V - minimizes standby current in low-power regulator designs |
| Operating Temp Range | −65 °C to +200 °C - supports industrial, automotive under-hood, and aerospace environments |
Pinout & Package
Package: Axial-lead, transfer-molded plastic (CASE 017AA, Surmetic 40). Cathode identified by single black band. Leads are solderable per J-STD-020; max solder temperature 260 °C for 10 s at 1/16″ from case.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; forms reference ground return path |
| Cathode | Zener breakdown terminal / regulated output node | Provides stable 11.0 V output relative to anode; marked with polarity band for orientation |
Key Features
| Feature | Design Value |
|---|---|
| ESD robustness | Class 3 (>16 kV HBM) - survives handling and board-level ESD events without parameter shift |
| Surge capability | 430 A peak @ 8.3 ms - protects downstream circuitry from lightning-induced or inductive-switching transients |
| Tight voltage tolerance | ±5% (JEDEC B-suffix) - eliminates need for post-assembly trimming in precision references |
| Pb-free compliance | RoHS-compliant Surmetic 40 package - meets global environmental regulations without performance trade-offs |
| High-temperature operation | Rated to +200 °C (pulsed) - suitable for engine control units and downhole electronics |
Applications
| Voltage Reference for SMPS Feedback | Overvoltage Clamp in Automotive ECUs |
|---|---|
Use Scenario: Provides stable 11.0 V reference for optocoupler-based feedback in 12 V input flyback converters. IC Role / Device Role / Timing Role: Zener diode acting as precision shunt reference in secondary-side regulation loop. Use Value: 125 Ω impedance ensures <1% output deviation during line/load transients; ±5% tolerance avoids calibration overhead. |
Use Scenario: Clamps 12 V battery rail surges (e.g., load dump) to protect microcontroller I/O pins. IC Role / Device Role / Timing Role: Shunt protection device diverting excess energy to ground during ISO 7637-2 pulse 5a events. Use Value: 430 A surge rating handles 35 V/100 ms pulses without failure; 200 °C max rating sustains under-hood temperatures. |
| Industrial Sensor Excitation Supply | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Supplies regulated 11.0 V excitation to 4–20 mA current-loop pressure sensors in factory automation. IC Role / Device Role / Timing Role: Fixed-voltage shunt regulator establishing sensor bias point independent of supply ripple. Use Value: Low 0.25 mA leakage at 8.0 V prevents loading of high-impedance sensor bridges; −65 °C to +200 °C range covers ambient extremes. |
Use Scenario: Protects 24 V digital input channels from field-wiring induced transients in industrial control cabinets. IC Role / Device Role / Timing Role: Primary clamping element limiting input voltage to safe levels before opto-isolator stage. Use Value: 5 W power rating absorbs repeated 100 V/10 ms spikes; axial package allows through-hole mounting for mechanical ruggedness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5348 | Same electrical specs but ±10% tolerance (no B-suffix); not JEDEC-compliant for tight-regulation use | Acceptable only where 11.0 V ±10% is sufficient; unsuitable for feedback references requiring ±5% | Select 1N5348B when design requires guaranteed 11.0 V ±5% and JEDEC-compliant traceability |
| BZX85C11 | 1.3 W rating, 11 V ±5%, TO-226AA package; higher ZZT (200 Ω) and lower surge rating (100 A) | Limited to low-power signal conditioning; cannot replace 1N5348B in 5 W regulator or surge clamp roles | Choose BZX85C11 only for space-constrained PCBs where 5 W dissipation is unnecessary |
Compared with 1N5348 and BZX85C11, the 1N5348B delivers superior thermal robustness (5 W vs. 1.3 W), tighter regulation (±5% vs. same tolerance but no JEDEC guarantee), and 4.3× higher surge immunity - making it the sole choice for industrial-grade 11 V shunt regulation where reliability and power handling are critical.
Availability
1N5348B is available at Aetrix Electronics and suitable for voltage reference, overvoltage protection, and industrial sensor excitation requiring stable component supply and long-term lifecycle continuity.
Supply support for 1N5348B 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 specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.
The 1N53 Series belongs to onsemi's legacy Zener regulator portfolio, engineered for high-reliability DC voltage stabilization in harsh environments - emphasizing thermal resilience, surge survivability, and JEDEC-standardized tolerances.
FAQ
What is the exact zener voltage tolerance and test condition for 1N5348B?
The 1N5348B has a guaranteed ±5% zener voltage tolerance, meaning its nominal 11.0 V rating falls between 10.45 V and 11.55 V when measured at IZT = 2.5 mA, 40 ±10 ms pulse duration, and TA = 25 °C ±8 °C. This JEDEC B-suffix specification ensures compliance with tight-regulation requirements in feedback and reference designs.
How does the 1N5348B handle thermal stress in high-ambient environments?
The 1N5348B is rated for operation from −65 °C to +200 °C, with DC power derating beginning above 25 °C at 40 mW/°C. Its 25 °C/W junction-to-lead thermal resistance allows direct thermal coupling to heatsinks or PCB copper, enabling sustained 5 W dissipation when leads are properly thermally anchored - critical for engine control or downhole applications.
Can the 1N5348B be used as a direct replacement for older 1N5348 parts?
No - the 1N5348B is not a drop-in replacement for the non-B-suffix 1N5348. While both share identical nominal voltage and package, only the 1N5348B guarantees ±5% tolerance and full JEDEC compliance. The standard 1N5348 carries ±10% tolerance and lacks the same process controls, making it unsuitable where precision regulation is required.
What is the maximum surge current rating of the 1N5348B and under what conditions?
The 1N5348B supports a peak non-repetitive surge current of 430 A when subjected to an 8.3 ms square-wave pulse at TA = 25 °C. This rating is validated per Figure 5 in the onsemi datasheet and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure - essential for automotive load-dump protection.
Is the 1N5348B RoHS-compliant and what packaging options are available?
Yes, the 1N5348B is RoHS-compliant and supplied in a Pb-free Surmetic 40 axial-lead plastic package (CASE 017AA). It is available in both bulk (1000 units/box) and tape-and-reel (4000 units/reel) formats, with G-suffix denoting Pb-free construction - fully compatible with lead-free reflow and wave soldering processes.
1N5348B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8.4 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
1N5348B FAQ
1.How can I place an order for 1N5348B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5348B 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 1N5348B reliable?
The price and inventory of 1N5348B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5348B is usually 5 days.
3.What payment methods are accepted for 1N5348B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5348B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5348B?
1N5348B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5348B 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 1N5348B?
For technical support, including 1N5348B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5348B requirements.
6.How does Aetrix verify that 1N5348B is sourced from the original manufacturer or authorized distributors?
All 1N5348B 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 1N5348B meets industry standards.
7.What is the process for return or replacement of 1N5348B?
All 1N5348B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5348B, 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 1N5348B part is unused and in its original packaging.
Return procedure for 1N5348B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5348B Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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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
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SMAZ12-13-F
Diodes Incorporated
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