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onsemi 1N5343BRL
- Part No.:
- 1N5343BRL
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343BRL.pdf
- Description:
- DIODE ZENER 7.5V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:9,669
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Product details
Overview
1N5343BRL from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 7.5 V (±5%), maximum zener impedance of 175 Ω at 1.5 mA test current, and surge rating of 630 A at 8.3 ms. It operates across −65 °C to +200 °C and is used for precision voltage regulation in DC power supply feedback loops, overvoltage protection circuits, and reference voltage generation.
For engineers reviewing the 1N5343BRL datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, thermal behavior, mechanical package details, and real-world design context for stable voltage reference implementation in industrial and automotive power systems.
Technical Context
The 1N5343BRL uses a silicon-oxide passivated junction to achieve tight ±5% zener voltage tolerance and low leakage (≤0.15 mA at 5.7 V). Its 175 Ω dynamic impedance at IZT = 1.5 mA ensures stable regulation under moderate load variation.
Thermal performance is defined by a junction-to-lead thermal resistance (θJL) of 25 °C/W at TL = 25 °C with 3/8″ lead length, enabling reliable 5 W dissipation when mounted with adequate heatsinking. The device exhibits a positive temperature coefficient above 5 V, typical for 7.5 V units.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.13 V (min) to 7.88 V (max) at IZT = 1.5 mA - defines regulation window for feedback sensing accuracy |
| Power Dissipation (PD) | 5 W at TL = 25 °C - sets maximum continuous DC power handling before thermal derating |
| Zener Impedance (ZZT) | 175 Ω max at IZT = 1.5 mA - determines output voltage deviation under load transients |
| Surge Current (IR) | 630 A peak at 8.3 ms pulse width - supports transient overvoltage clamping without failure |
| Leakage Current (IR) | ≤0.15 mA at VR = 5.7 V - ensures minimal quiescent current in high-impedance bias networks |
| Junction Temp Range | −65 °C to +200 °C - enables operation in under-hood automotive and industrial environments |
| ESD Rating | Class 3 (>16 kV HBM) - provides robustness during board assembly and handling |
Pinout & Package
Package: Axial-lead, transfer-molded plastic (Case 017AA), cathode indicated by band. Dimensions: 8.38–8.89 mm length × 3.30–3.68 mm diameter, leads 25.4–31.75 mm long.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side in reverse-bias regulation; forms return path for zener current |
| Cathode | Zener breakdown terminal / regulated output node | Connected to higher-potential rail; supplies stable reference voltage when reverse biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees regulation within 7.13–7.88 V without post-manufacturing trimming |
| 175 Ω max zener impedance at 1.5 mA | Minimizes output voltage shift under 1–2 mA load changes in feedback networks |
| 630 A surge rating (8.3 ms) | Clamps fast transients such as ISO 7637-2 Pulse 1/2a without degradation |
| −65 °C to +200 °C operating range | Supports placement near heat sources (e.g., power MOSFETs) in engine control units |
| Pb-free axial package (RoHS compliant) | Enables compliance with automotive ELV and industrial RoHS directives without requalification |
Applications
| DC Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using optocoupler feedback. IC Role / Device Role: Provides precise 7.5 V reference to TL431 shunt regulator input. Use Value: Enables ±1% output regulation stability across line/load/temperature due to tight VZ tolerance and low ZZT. |
Use Scenario: Protecting microcontroller I/O pins from 12 V rail surges in automotive body control modules. IC Role / Device Role: Clamps transient spikes above 7.88 V to prevent latch-up or ESD damage. Use Value: Absorbs 630 A surges (8.3 ms) without parametric shift, preserving system reliability per ISO 16750-2. |
| Reference Voltage Source | Current Source Bias Network |
Use Scenario: Generating stable bias for analog sensor signal conditioning in industrial PLC analog inputs. IC Role / Device Role: Supplies 7.5 V reference to op-amp gain-setting resistors and ADC reference buffers. Use Value: Maintains <0.5% drift over −40 °C to +105 °C ambient due to predictable positive tempco above 5 V. |
Use Scenario: Setting constant current for LED driver bias in emergency lighting control circuits. IC Role / Device Role: Establishes fixed voltage drop across series resistor to define LED current. Use Value: Delivers stable 7.5 V despite input ripple up to 20%, reducing current variation to <2%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | Same electrical specs but supplied in 1000-unit box (not tape-and-reel); identical axial Pb-free package | No difference in circuit function or layout; differs only in packaging format | Select 1N5343B for manual prototyping or low-volume builds where reel handling is unnecessary |
| BZX85C7V5 | 3 W rating, 7.5 V ±5%, 200 Ω ZZT @ 5 mA - lower power and higher impedance than 1N5343BRL | Suitable for low-current references (<10 mA), not recommended for >500 mW dissipation or surge-heavy environments | Choose BZX85C7V5 only if power demand stays below 3 W and surge immunity is not required |
Compared with 1N5343BRL, 1N5343B offers identical performance in a different packaging format, while BZX85C7V5 trades 40% lower power rating and higher impedance for smaller footprint - making 1N5343BRL the sole choice for 5 W, low-impedance, high-surge applications.
Availability
1N5343BRL is available at Aetrix Electronics and suitable for DC power supply feedback, overvoltage protection clamp, and reference voltage source applications requiring stable component supply, full traceability, and automotive-grade thermal resilience.
Supply support for 1N5343BRL 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, and cloud power markets.
The 1N53 Series belongs to onsemi's Surmetic 40 Zener regulator family, engineered for high-reliability voltage reference and transient suppression in harsh-environment power systems where precision, surge robustness, and wide temperature operation are critical.
FAQ
What is the zener voltage tolerance of the 1N5343BRL?
The 1N5343BRL has a guaranteed ±5% zener voltage tolerance, resulting in a specified range of 7.13 V (minimum) to 7.88 V (maximum) at a test current of 1.5 mA. This tight tolerance eliminates the need for external calibration in most feedback and reference applications, and is confirmed in the onsemi datasheet revision 19, Table on page 2.
Can the 1N5343BRL be used in automotive under-hood applications?
Yes, the 1N5343BRL is rated for operation from −65 °C to +200 °C, with DC max junction temperature of +150 °C - fully supporting under-hood environments such as engine control units and transmission control modules. Its 630 A surge rating also meets ISO 7637-2 transient immunity requirements when properly heatsinked.
What is the maximum steady-state power dissipation for the 1N5343BRL?
The 1N5343BRL is rated for 5 W maximum steady-state power dissipation at lead temperature (TL) = 25 °C with 3/8″ lead length. Above 25 °C, it must be derated at 40 mW/°C, meaning usable power drops to ~3.5 W at TL = 62.5 °C. This value is explicitly listed in the "Maximum Ratings" table on page 1 of the onsemi datasheet.
How does the zener impedance of the 1N5343BRL affect regulation accuracy?
The 1N5343BRL has a maximum zener impedance (ZZT) of 175 Ω at IZT = 1.5 mA. This directly determines how much the output voltage shifts under changing load current - for example, a 1 mA change in zener current causes ≤0.175 V deviation. Low ZZT makes the 1N5343BRL suitable for applications demanding tight regulation under dynamic loads.
Is the 1N5343BRL RoHS compliant and lead-free?
Yes, the "G" suffix in the ordering code (1N5343BRL, G) confirms the 1N5343BRL is supplied in a Pb-free, RoHS-compliant axial package per onsemi's Pb-Free strategy documentation. The device meets JEDEC J-STD-609A Class 3 marking requirements and is compatible with standard SnAgCu reflow profiles.
1N5343BRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.7 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
1N5343BRL FAQ
1.How can I place an order for 1N5343BRL through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343BRL 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 1N5343BRL reliable?
The price and inventory of 1N5343BRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343BRL is usually 5 days.
3.What payment methods are accepted for 1N5343BRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343BRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343BRL?
1N5343BRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343BRL 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 1N5343BRL?
For technical support, including 1N5343BRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343BRL requirements.
6.How does Aetrix verify that 1N5343BRL is sourced from the original manufacturer or authorized distributors?
All 1N5343BRL 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 1N5343BRL meets industry standards.
7.What is the process for return or replacement of 1N5343BRL?
All 1N5343BRL units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343BRL, 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 1N5343BRL part is unused and in its original packaging.
Return procedure for 1N5343BRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343BRL Tags
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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
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
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SMAZ12-13-F
Diodes Incorporated
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