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Microchip Technology 1N5346E3/TR12
- Part No.:
- 1N5346E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346E3/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,509
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Product details
Overview
1N5346E3/TR12 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with nominal regulation voltage of 9.1 V, ±5% tolerance (B-suffix equivalent), 2.0 Ω maximum dynamic impedance at 150 mA test current, and 520 Ω maximum knee impedance at 1.0 mA. It operates from −65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5346E3/TR12 datasheet, 1N5346E3/TR12 pinout, 1N5346E3/TR12 application, or 1N5346E3/TR12 equivalent, key selection criteria include Zener voltage stability under varying load current, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.2 A), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a shunt voltage regulator by maintaining a stable reverse-biased breakdown voltage across its terminals when operated within specified current limits. Its low dynamic impedance (2.0 Ω) ensures minimal voltage variation over a wide operating current range (10–50% of IZM = 9.2 A).
The 1N5346E3/TR12 uses a void-free thermosetting epoxy T-18 package with cathode band marking, rated for 5.0 W steady-state dissipation at 25 °C lead temperature and derated linearly above that point. It meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity with no dry pack required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - defines precise regulation point for feedback networks and reference circuits |
| Test Current (IZT) | 150 mA - standard bias condition for measuring VZ and ZZ |
| Dynamic Impedance (ZZ) | 2.0 Ω max at IZT - ensures <0.3 V shift over ±15 mA load change |
| Max Regulator Current (IZM) | 9.2 A - peak DC current capability with adequate heat sinking at TL = 25 °C |
| Surge Current (IZSM) | 9.2 A - non-repetitive 8.3 ms half-sine pulse handling for transient suppression |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design with 3/8″ (10 mm) lead length from body |
| Forward Voltage (VF) | 1.2 V max @ 1.0 A - supports use as clamp or series rectifier in dual-role designs |
Pinout & Package
T-18 axial-leaded plastic package with cathode indicated by black band; leads are annealed matte-tin plated per MIL-STD-750 Method 2026 and solderable at 260 °C for 10 s.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side terminal in shunt configuration | Connected to ground or common return path; carries full regulated current |
| Cathode | High-side terminal in shunt configuration | Banded end; connected to input rail or error amplifier input; defines regulated output voltage |
Key Features
| Feature | Design Value |
|---|---|
| RoHS-compliant construction | e3 suffix confirms lead-free matte-tin plating and halogen-free epoxy per EU Directive 2011/65/EU |
| Moisture sensitivity Level 1 | No dry pack required; safe for standard SMT reflow and manual assembly without baking |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands >4 kV HBM without parameter shift |
| Stable voltage regulation | ΔVZ ≤ 0.22 V between 10% and 50% of IZM - critical for low-drift analog references |
| High surge endurance | Rated for 9.2 A non-repetitive 8.3 ms half-sine - protects downstream circuitry from line transients |
Applications
| Switching Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Used in optocoupler-coupled feedback loop of isolated 12 V DC-DC converter to regulate output voltage. IC Role / Device Role / Timing Role: Shunt voltage reference defining setpoint for TL431-like control IC; absorbs excess current during regulation. Use Value: 9.1 V nominal VZ matches 12 V rail minus opto LED forward drop; ±5% tolerance ensures ±0.45 V setpoint accuracy. |
Use Scenario: Placed across motor driver output to suppress inductive kickback spikes exceeding 15 V. IC Role / Device Role / Timing Role: Passive clamping element limiting voltage excursion to 9.1 V + VF during flyback events. Use Value: 9.2 A surge rating handles 10 ms spikes from 24 V brushed DC motors; low ZZ minimizes clamping overshoot. |
| Industrial Sensor Reference | Programmable Logic Controller Input Protection |
Use Scenario: Provides stable 9.1 V reference for 16-bit ADC front-end in temperature transmitter module. IC Role / Device Role / Timing Role: Precision voltage source for ratiometric scaling of bridge sensor outputs. Use Value: ΔVZ ≤ 0.22 V ensures <0.0025% full-scale error contribution over operating current range. |
Use Scenario: Connected between 24 V field input and ground on PLC digital input card to limit transients. IC Role / Device Role / Timing Role: Primary overvoltage protection device absorbing surge energy before TVS or input buffer. Use Value: 5.0 W power rating sustains repeated 100 V/1 A surges per IEC 61000-4-5; cathode-band polarity prevents forward conduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | Same VZ, IZT, ZZ, and package; differs only in RoHS status (B = SnPb, E3 = matte-tin) | Not suitable for RoHS-compliant production; requires Pb-containing solder process | Select 1N5346B only for legacy repair or non-RoHS military programs requiring JAN screening prefixes |
| SMBJ5346B | Surface-mount SMB package; identical electrical specs but 85 °C/W RθJA vs. 25 °C/W RθJL | Requires PCB copper area for thermal management; unsuitable for through-hole prototyping or high-current discrete mounting | Choose SMBJ5346B for space-constrained automated assembly where board-level heat sinking is feasible |
Compared with 1N5346B and SMBJ5346B, the 1N5346E3/TR12 delivers identical regulation performance with RoHS compliance and superior thermal performance in axial-leaded configurations-enabling higher continuous current in chassis-mounted or heatsinked applications without PCB copper area dependency.
Availability
1N5346E3/TR12 is available at Aetrix Electronics and suitable for switching power supply feedback, overvoltage clamp circuits, and industrial sensor reference applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 1N5346E3/TR12 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
Microsemi (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge resilience, and long-term parametric stability under extended temperature cycling.
FAQ
What is the Zener voltage tolerance of 1N5346E3/TR12?
The 1N5346E3/TR12 has a nominal Zener voltage of 9.1 V with ±5% tolerance, consistent with the "B" suffix designation in the 1N53xxB family. This tolerance is verified per JEDEC registration and applies across the full operating temperature range of −65 °C to +150 °C when measured at 150 mA test current and 25 °C lead temperature.
Can 1N5346E3/TR12 be used in surface-mount designs?
No-1N5346E3/TR12 is an axial-leaded T-18 package and not compatible with SMT placement. For surface-mount equivalents, Microsemi specifies SMBJ5346B (DO-214AA) or SMBG5346B (DO-214AB), which share identical electrical characteristics but require different PCB layout and thermal management strategies.
What is the maximum continuous power dissipation for 1N5346E3/TR12?
The 1N5346E3/TR12 is rated for 5.0 W steady-state power dissipation at 25 °C lead temperature (TL). Derating begins linearly above 25 °C at 20 mW/°C, reaching zero dissipation at 150 °C TL. On FR4 PCB with 4 mm² copper pads, maximum dissipation drops to 1.47 W at 25 °C ambient.
Does 1N5346E3/TR12 meet RoHS requirements?
Yes-the "e3" suffix explicitly denotes RoHS compliance: matte-tin lead plating per MIL-STD-750 Method 2026 and halogen-free epoxy encapsulation meeting EU Directive 2011/65/EU. No exemptions are applied; lead content is below 1000 ppm threshold.
How is polarity marked on 1N5346E3/TR12?
The cathode of 1N5346E3/TR12 is marked by a distinct black band on the epoxy body. The diode must be operated with the banded end positive relative to the unmarked (anode) end to achieve Zener breakdown regulation. Forward conduction occurs at ≤1.2 V across anode-to-cathode.
1N5346E3/TR12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- T-18, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 1 A
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- T-18
1N5346E3/TR12 FAQ
1.How can I place an order for 1N5346E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346E3/TR12 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 1N5346E3/TR12 reliable?
The price and inventory of 1N5346E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346E3/TR12?
1N5346E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346E3/TR12 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 1N5346E3/TR12?
For technical support, including 1N5346E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346E3/TR12 requirements.
6.How does Aetrix verify that 1N5346E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346E3/TR12 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 1N5346E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346E3/TR12?
All 1N5346E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346E3/TR12, 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 1N5346E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5346E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346E3/TR12 Tags
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