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Microchip Technology 1N5345AE3/TR8
- Part No.:
- 1N5345AE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345AE3/TR8.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,631
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Product details
Overview
1N5345AE3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 8.7 V ±10%, 150 mA maximum Zener current (IZM), 2.0 Ω maximum dynamic impedance (ZZ) at 150 mA test current, and operates across -65°C to +150°C. It serves as a precision voltage reference and overvoltage clamp in DC power supply feedback loops.
For engineers reviewing the 1N5345AE3/TR8 datasheet, 1N5345AE3/TR8 pinout, 1N5345AE3/TR8 application, or 1N5345AE3/TR8 equivalent, key selection criteria include its ±10% tolerance, 5 W steady-state power rating at 3/8" lead length, 2.0 Ω dynamic impedance, RoHS-compliant matte-tin plating, and tape-and-reel packaging (TR8).
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its Zener voltage is specified at 8.7 V with ±10% tolerance (A suffix), measured at 150 mA test current (IZT) and 25°C lead temperature (TL). Voltage regulation (ΔVZ) is 0.20 V - the difference between voltages at 10% and 50% of IZM.
Thermal resistance is 25°C/W junction-to-lead at 3/8" (10 mm) lead length, enabling stable 5 W operation with minimal heat sinking. It exhibits 200 Ω maximum dynamic knee impedance (ZZK) at 1.0 mA and withstands 545 A surge current (IZSM) for 8.3 ms half-sine pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±10% - defines regulated output voltage under nominal bias; supports mid-range analog reference design. |
| Test Current (IZT) | 150 mA - standard operating point for VZ measurement; ensures stable regulation in linear power supplies. |
| Dynamic Impedance (ZZ) | 2.0 Ω max at IZT - low AC impedance enables tight voltage control during load transients. |
| Max Regulator Current (IZM) | 545 mA - maximum continuous DC current at TL = 25°C; sets upper limit for shunt regulator sizing. |
| Power Dissipation (Pd) | 5.0 W at TL < 25°C - thermal performance allows high-current clamping without forced cooling. |
| Operating Temperature | -65°C to +150°C - wide range supports industrial and automotive under-hood applications. |
| Reverse Leakage (IR) | 10 μA max at VR = 6.25 V - low leakage preserves efficiency in high-impedance bias networks. |
Pinout & Package
Package: Axial-leaded T-18 plastic case per JEDEC DO-204AL. Cathode indicated by color band; banded end must be held positive relative to anode for reverse-bias operation. RoHS-compliant matte-tin plated leads, moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to system ground or lower-potential rail; forms return path for Zener current. |
| Cathode | Regulated output node | Banded terminal; connected to voltage node requiring stabilization; sinks current to maintain VZ. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard DO-204AL mechanical and electrical definitions for interchangeability. |
| RoHS-compliant (e3) | Lead-free matte-tin plating meets EU RoHS Directive 2011/65/EU and J-STD-020B Level 1 handling. |
| Tape-and-reel packaging (TR8) | Standard EIA-296 compliant reel format enables automated SMT placement despite axial form factor. |
| Low thermal resistance | 25°C/W junction-to-lead allows full 5 W dissipation with simple lead-length heat sinking (3/8" from body). |
| High surge capability | 545 A non-recurrent surge rating (8.3 ms half-sine) provides robust transient overvoltage protection. |
Applications
| DC Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or forward converter feedback paths using optocoupler-coupled error amplifiers. IC Role / Device Role / Timing Role: Voltage reference element providing precise 8.7 V threshold to error amplifier input. Use Value: Maintains ±10% output regulation across line/load/temperature with minimal drift due to low ΔVZ (0.20 V). | Use Scenario: Protecting downstream 12 V logic rails from accidental 24 V supply misconnection or load-dump transients. IC Role / Device Role / Timing Role: Shunt clamping device diverting excess current when input exceeds 8.7 V + tolerance margin. Use Value: Absorbs up to 5 W continuously or 545 A surges without failure, preventing IC damage in industrial controls. |
| Programmable Reference Source | Current Source Bias Network |
Use Scenario: Generating stable bias voltages for op-amp comparators or ADC reference dividers in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Precision voltage node establishing known potential for resistor-divider scaling. Use Value: Delivers 8.7 V ±10% with 2.0 Ω dynamic impedance, minimizing error contribution in 12-bit measurement systems. | Use Scenario: Setting constant current in LED driver or transistor bias circuits via series resistor + Zener configuration. IC Role / Device Role / Timing Role: Voltage-controlled current sink defining base-emitter or gate-source bias points. Use Value: Enables predictable 150 mA nominal current setting with <0.2 V regulation shift across operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | ±5% tolerance (vs. ±10% for 1N5345AE3/TR8); identical VZ, IZT, ZZ, and package. | Higher precision required where tighter regulation is critical (e.g., metrology references). | Select 1N5345B when ±5% tolerance is mandatory; otherwise 1N5345AE3/TR8 offers cost-effective RoHS compliance and TR8 packaging. |
| MMBZ5235BS | Surface-mount SOD-123 package; 8.2 V ±5%; 200 mW power rating (vs. 5 W). | Space-constrained PCBs where board area is limited but power dissipation needs are low (<200 mW). | Choose MMBZ5235BS only for low-power signal-level referencing; 1N5345AE3/TR8 remains necessary for >500 mA shunt current capability. |
Compared with 1N5345B and MMBZ5235BS, the 1N5345AE3/TR8 uniquely combines RoHS compliance, tape-and-reel automation support, 5 W power handling, and ±10% tolerance - making it optimal for industrial power supply designs requiring reliable through-hole mounting and high-energy transient suppression.
Availability
1N5345AE3/TR8 is available at Aetrix Electronics and suitable for DC power supply feedback, overvoltage clamp circuits, and programmable reference source applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant manufacturing.
Supply support for 1N5345AE3/TR8 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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge immunity, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5345AE3/TR8?
The 1N5345AE3/TR8 has a Zener voltage tolerance of ±10%, as indicated by the "A" suffix in its part number. This means its nominal 8.7 V regulation voltage falls within the range of 7.83 V to 9.57 V at 150 mA test current and 25°C lead temperature. The e3 suffix confirms RoHS compliance, and TR8 denotes EIA-296 tape-and-reel packaging. This tolerance is suitable for general-purpose voltage referencing where tight regulation is not critical.
How much power can the 1N5345AE3/TR8 dissipate continuously?
The 1N5345AE3/TR8 is rated for 5.0 W steady-state power dissipation at a lead temperature (TL) below 25°C, measured 3/8 inch (10 mm) from the body. When mounted on a standard FR4 PCB with 1 oz copper, its derated power drops to 1.47 W at 25°C ambient. Its 25°C/W junction-to-lead thermal resistance enables full 5 W operation with minimal heatsinking - a key advantage over lower-power Zeners like the MMBZ5235BS.
What does the "TR8" suffix mean in 1N5345AE3/TR8?
The "TR8" suffix in 1N5345AE3/TR8 indicates EIA-296 standard tape-and-reel packaging with 8 mm carrier tape width, enabling automated pick-and-place assembly despite its axial-leaded T-18 package. This distinguishes it from bulk or ammo-pack versions and ensures compatibility with high-volume manufacturing lines. The "e3" portion confirms RoHS-compliant matte-tin plating, while "A" specifies ±10% Zener voltage tolerance - all encoded directly in the full part number 1N5345AE3/TR8.
Can the 1N5345AE3/TR8 replace the 1N5345B in existing designs?
The 1N5345AE3/TR8 can replace the 1N5345B electrically and mechanically, but with a trade-off in voltage tolerance: 1N5345B offers ±5% (tighter), while 1N5345AE3/TR8 provides ±10%. Both share identical 8.7 V nominal VZ, 150 mA IZT, 2.0 Ω ZZ, T-18 package, and cathode band polarity. The e3/TR8 version adds RoHS compliance and tape-and-reel packaging - ideal for new production, though legacy designs requiring ±5% should retain 1N5345B or verify system margin.
What is the maximum surge current rating for the 1N5345AE3/TR8?
The 1N5345AE3/TR8 has a maximum non-recurrent surge current (IZSM) rating of 545 A, defined as the peak value of an 8.3 ms half-sine waveform. This high surge capability enables robust protection against load dump, inductive switching spikes, and ESD-related transients in industrial power systems. It complements the device's 5 W continuous power rating and makes the 1N5345AE3/TR8 especially suitable for overvoltage clamp circuits where energy absorption beyond steady-state limits is required.
1N5345AE3/TR8 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):
- 8.7 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 6.25 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
1N5345AE3/TR8 FAQ
1.How can I place an order for 1N5345AE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345AE3/TR8 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 1N5345AE3/TR8 reliable?
The price and inventory of 1N5345AE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345AE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5345AE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345AE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345AE3/TR8?
1N5345AE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345AE3/TR8 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 1N5345AE3/TR8?
For technical support, including 1N5345AE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345AE3/TR8 requirements.
6.How does Aetrix verify that 1N5345AE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5345AE3/TR8 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 1N5345AE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5345AE3/TR8?
All 1N5345AE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345AE3/TR8, 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 1N5345AE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5345AE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345AE3/TR8 Tags
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BZX84C3V3LT1G
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MM5Z5V1ST1G
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