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onsemi 1N5346B
- Part No.:
- 1N5346B
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346B.pdf
- Description:
- DIODE ZENER 9.1V 5W AXIAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
1N5346B from onsemi is a 5 W axial-lead Zener diode with nominal zener voltage of 9.1 V, ±5% tolerance, maximum zener impedance of 150 Ω at 2 mA test current, and surge rating of 520 A at 8.3 ms. It provides stable voltage regulation in power supply reference and overvoltage protection circuits for industrial DC power rails.
For engineers reviewing the 1N5346B datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), low leakage current (0.22 mA at 7.36 V), and Pb-free Surmetic 40 plastic package compatibility with wave and reflow soldering.
Technical Context
The 1N5346B operates as a silicon-oxide passivated junction Zener regulator, optimized for steady-state DC voltage clamping and reference generation. Its design supports precise regulation across temperature via a defined voltage coefficient curve for 9–10 V devices, and it maintains stability under transient surges up to 180 W for 8.3 ms.
It features Class 3 ESD robustness (>16 kV HBM), corrosion-resistant leads rated for 260 °C soldering at 1/16 inch from case for 10 seconds, and polarity indicated by cathode band. The device is not intended for AC line applications or high-frequency switching due to inherent junction capacitance and thermal time constants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.65–9.56 V @ IZT = 2 mA; ensures ±5% regulation window for 9.1 V nominal reference |
| Max Power Dissipation | 5 W @ TL = 25°C; defines absolute thermal limit before derating begins at 40 mW/°C above 25°C |
| Zener Impedance | 150 Ω max @ IZT = 2 mA; determines output voltage deviation under load current changes |
| Leakage Current | 0.22 mA max @ VR = 7.36 V; limits standby power loss in high-impedance bias networks |
| Surge Current | 520 A peak @ 8.3 ms pulse; enables transient overvoltage suppression without failure |
| Junction-to-Lead RθJL | 25 °C/W; governs thermal path efficiency from die to PCB copper when leads are used as heatsinks |
| Operating Temp Range | −65°C to +200°C; supports extended industrial and under-hood automotive environments |
Pinout & Package
Package: Axial-lead Surmetic 40 plastic case (JEDEC CASE 017AA), void-free transfer-molded thermosetting material, cathode indicated by color band. Dimensions: body length 8.38–8.89 mm, body diameter 3.30–3.68 mm, lead diameter 0.94–1.09 mm, overall length 25.4–31.75 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference node | Connected to lower-potential side of regulated circuit; establishes reference ground for shunt regulation |
| Cathode | Zener breakdown terminal / Regulation output node | Connected to higher-potential rail; delivers stable 9.1 V reference when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Guarantees tight regulation window (8.65–9.56 V) without post-manufacture trimming |
| 150 Ω max dynamic impedance @ 2 mA | Minimizes output voltage shift under varying load currents in feedback or reference paths |
| Class 3 ESD rating (>16 kV HBM) | Enables handling and assembly without external ESD protection in board-level manufacturing |
| 180 W non-repetitive surge capability | Withstands inrush, lightning-induced transients, and load-dump events in 12 V systems |
| Pb-free Surmetic 40 package | Complies with RoHS and JEDEC J-STD-020 reflow profiles up to 260 °C for 10 s |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp for 12 V Rail |
|---|---|
Use Scenario: Precision voltage reference for linear regulator feedback divider or ADC reference buffer in programmable logic controllers. IC Role / Device Role / Timing Role: Shunt voltage regulator providing stable 9.1 V reference point independent of input ripple or load variation. Use Value: Enables ±0.5% output accuracy in 24 V DC-DC converters using standard op-amp error amplifiers and resistive dividers. |
Use Scenario: Transient suppression on automotive 12 V battery-fed microcontroller power inputs during load dump events. IC Role / Device Role / Timing Role: Clamping element that conducts excess energy above 9.56 V to ground, limiting downstream IC stress. Use Value: Survives 520 A surge pulses per ISO 7637-2 Pulse 5a without degradation, protecting 3.3 V logic rails via series impedance. |
| Low-Power Sensor Bias Network | Legacy Analog Circuit Voltage Stabilizer |
Use Scenario: Stable excitation voltage for bridge-based pressure sensors in HVAC control modules operating at −40°C to +105°C. IC Role / Device Role / Timing Role: Zener-regulated bias source replacing active regulators to reduce quiescent current and component count. Use Value: Delivers <100 ppm/°C drift over −40°C to +105°C, maintaining sensor offset stability within 0.1% full scale. |
Use Scenario: Replacement voltage reference in legacy industrial timers and relay drivers using discrete transistor logic. IC Role / Device Role / Timing Role: DC voltage stabilizer for base bias networks in BJT switch stages requiring fixed turn-on threshold. Use Value: Maintains consistent 9.1 V clamp across 50,000-hour field life with no parameter drift beyond datasheet limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | Nominal VZ = 8.7 V (min 8.27 V, max 9.14 V); 150 Ω ZZT; 545 A surge rating | Slightly lower regulation point; better suited for 8.5–9.0 V reference targets | Select when tighter alignment to 8.7 V nominal is required and 0.4 V lower clamping threshold is acceptable |
| 1N5347B | Nominal VZ = 10 V (min 9.5 V, max 10.5 V); 125 Ω ZZT; 475 A surge rating | Higher regulation voltage; lower dynamic impedance but reduced surge margin | Choose for 10 V reference designs where lower impedance outweighs need for 520 A surge headroom |
Compared with 1N5345B and 1N5347B, the 1N5346B offers the optimal balance of 9.1 V nominal regulation, 150 Ω impedance, and highest surge rating (520 A) in the 9 V class-making it preferred for 12 V system clamping where both precision and ruggedness are critical.
Availability
1N5346B is available at Aetrix Electronics and suitable for industrial power supplies, automotive overvoltage protection, sensor bias networks, and legacy analog circuit stabilization requiring stable component supply and long-term lifecycle continuity.
Supply support for 1N5346B 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 delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
The 1N53 Series belongs to onsemi's legacy Zener regulator product line, engineered for high-reliability DC voltage reference and transient suppression in harsh-environment electronics where passive simplicity and proven field performance are essential.
FAQ
What is the nominal zener voltage and tolerance of the 1N5346B?
The 1N5346B has a nominal zener voltage of 9.1 V with a guaranteed tolerance of ±5%, corresponding to a minimum of 8.65 V and maximum of 9.56 V at 2 mA test current. This tolerance is defined per JEDEC standards and applies specifically to the "B" suffix variant documented in the onsemi 1N53 Series datasheet Rev. 19.
What is the maximum power dissipation and thermal derating behavior of the 1N5346B?
The 1N5346B is rated for 5 W maximum steady-state power dissipation at lead temperature (TL) of 25°C, with linear derating of 40 mW/°C above that temperature. Its junction-to-lead thermal resistance is 25 °C/W, meaning a 5 W load generates a 125°C temperature rise from lead to junction under ideal heat-sinking conditions.
Does the 1N5346B have Pb-free packaging and what is its soldering profile?
Yes, the 1N5346B is offered in a Pb-free Surmetic 40 plastic package (marked with "G" suffix). Its leads are rated for 260°C for 10 seconds at 1/16 inch from the case, fully compliant with IPC/JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow and wave soldering processes.
What is the surge current rating of the 1N5346B and under what conditions is it specified?
The 1N5346B has a peak non-repetitive surge current rating of 520 A, specified for an 8.3 ms square-wave pulse at TA = 25°C. This rating reflects its ability to absorb transient energy without failure and is validated per onsemi's test methodology using defined mounting contact geometry and pulse waveform fidelity.
How does the zener impedance of the 1N5346B affect its regulation performance?
The 1N5346B exhibits a maximum zener impedance of 150 Ω at 2 mA test current (IZT). This value directly determines how much the output voltage shifts under changing load conditions - for example, a 1 mA change in zener current causes up to 150 mV deviation in regulated voltage, critical for high-accuracy reference applications.
1N5346B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.9 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
1N5346B FAQ
1.How can I place an order for 1N5346B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346B 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 1N5346B reliable?
The price and inventory of 1N5346B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346B is usually 5 days.
3.What payment methods are accepted for 1N5346B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346B?
1N5346B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346B 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 1N5346B?
For technical support, including 1N5346B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346B requirements.
6.How does Aetrix verify that 1N5346B is sourced from the original manufacturer or authorized distributors?
All 1N5346B 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 1N5346B meets industry standards.
7.What is the process for return or replacement of 1N5346B?
All 1N5346B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346B, 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 1N5346B part is unused and in its original packaging.
Return procedure for 1N5346B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346B Tags
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BZT52C5V6T-7
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BZX84C3V3LT1G
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
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SMAJ4744A-TP
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SMAZ12-13-F
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