My Inquiry
My Account
Microchip Technology 1N5345E3/TR12
- Part No.:
- 1N5345E3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5345E3/TR12.pdf
- Description:
- DIODE ZENER 8.7V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,679
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5345E3/TR12 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 8.7 V, ±5% tolerance (B-suffix equivalent), 150 mA maximum Zener current (IZM), 2.0 Ω maximum dynamic impedance (ZZ), and 10 μA maximum reverse leakage at 6.25 V. It operates from –65°C to +150°C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5345E3/TR12 datasheet, 1N5345E3/TR12 pinout, 1N5345E3/TR12 application, or 1N5345E3/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (9.5 A), voltage regulation (ΔVZ = 0.20 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-bias mode, maintaining stable output voltage across wide operating current (150 mA max) and temperature (–65°C to +150°C) ranges. Its low dynamic impedance (2.0 Ω) and tight voltage regulation (ΔVZ = 0.20 V) ensure minimal deviation under load transients.
The 1N5345E3/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 1.47 W on FR4 PCB. It meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity and withstands 8.3 ms half-sine surge currents up to 9.5 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.7 V ±5% - precise regulation point for 9 V rail clamping or reference generation |
| Test Current (IZT) | 150 mA - defined operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 2.0 Ω max - low AC resistance ensures stable voltage under varying load current |
| Max Reverse Leakage (IR) | 10 μA at 6.25 V - low off-state current minimizes standby power loss |
| Max Zener Current (IZM) | 150 mA - maximum continuous DC current before thermal derating applies |
| Surge Current (IZSM) | 9.5 A (8.3 ms half-sine) - handles transient overvoltage events without failure |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: T-18 axial-leaded plastic encapsulated case per JEDEC DO-41 outline; void-free UL94V-0 epoxy body; cathode indicated by colored band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; reverse bias applied across anode–cathode to enable regulation |
| Cathode | Zener breakdown terminal / regulated output node | Banded end; connected to voltage rail requiring stabilization; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures mechanical and electrical interchangeability across 1N53xxB series with standardized DO-41 footprint and test conditions |
| RoHS-compliant e3 suffix | Matte-tin lead finish meets EU RoHS Directive 2011/65/EU and eliminates lead-based solder compatibility concerns |
| Level 1 moisture sensitivity | No dry pack required prior to assembly; supports standard SMT/reflow handling without baking |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - no special ESD handling needed during board assembly or testing |
| High surge current capability | 9.5 A non-recurrent surge rating enables use in unprotected input stages without external TVS |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing unregulated 12 V DC output from linear regulators or rectifier bridges in industrial control modules. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing fixed 8.7 V reference to feedback network or load clamp. Use Value: Maintains ±5% output accuracy across –40°C to +85°C ambient with <0.20 V regulation delta under 10–150 mA load variation. | Use Scenario: Clamping transient spikes on 9 V battery-backed sensor nodes exposed to ESD or inductive switching noise. IC Role / Device Role / Timing Role: Passive crowbar element conducting only above 8.7 V to divert surge energy to ground. Use Value: Withstands 9.5 A 8.3 ms surges without degradation, eliminating need for additional TVS diodes in cost-sensitive designs. |
| Reference Voltage Source | Signal-Level Voltage Clamp |
Use Scenario: Generating stable 8.7 V reference for ADC biasing or op-amp comparator thresholds in medical instrumentation. IC Role / Device Role / Timing Role: Precision voltage source feeding high-impedance analog inputs with minimal current draw. Use Value: Delivers 10 μA max reverse leakage at 6.25 V, ensuring reference stability without loading sensitive front-end circuits. | Use Scenario: Limiting signal swing on microcontroller GPIO lines interfacing with 12 V automotive sensors. IC Role / Device Role / Timing Role: Bidirectional clamp (forward 1.2 V / reverse 8.7 V) protecting I/O pins from overvoltage. Use Value: Forward voltage ≤1.2 V at 1.0 A prevents signal distortion while reverse breakdown protects against >9 V faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5345B | Same 8.7 V ±5%, identical electrical specs, but SnPb lead finish (non-RoHS) | Not suitable for RoHS-compliant production; requires leaded solder process | Select 1N5345E3/TR12 when RoHS compliance and matte-tin plating are mandatory |
| SMBJ5345B | Surface-mount SMB package; same 8.7 V ±5% and 5 W rating; higher thermal resistance (junction-to-ambient ≈ 85 °C/W) | Requires PCB layout change; less effective heat sinking than axial T-18 in high-power density designs | Choose SMBJ5345B only when board space constraints prohibit axial components |
Compared with 1N5345B and SMBJ5345B, the 1N5345E3/TR12 uniquely combines RoHS compliance, axial-leaded thermal performance (25 °C/W junction-to-lead), and tape-and-reel packaging (TR12) for automated insertion - making it optimal for high-reliability, through-hole production requiring environmental compliance and thermal robustness.
Availability
1N5345E3/TR12 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and reference voltage source applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for 1N5345E3/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 specifically for ruggedized 5 W Zener regulation in harsh-environment power systems - emphasizing thermal resilience, surge immunity, and long-term parametric stability over extended temperature ranges.
FAQ
What is the Zener voltage tolerance of the 1N5345E3/TR12?
The 1N5345E3/TR12 has a Zener voltage tolerance of ±5%, confirmed by its "B"-equivalent specification in the Microsemi 1N5333B–1N5388B datasheet and consistent with the e3 RoHS-compliant variant of the 1N5345B. This tolerance is measured at 25°C lead temperature with 150 mA test current, and the device maintains regulation within this band across its full operating temperature range of –65°C to +150°C.
Does the 1N5345E3/TR12 require dry packing before PCB assembly?
No, the 1N5345E3/TR12 does not require dry packing. It is rated IPC/JEDEC J-STD-020B Level 1 for moisture sensitivity, meaning it can be stored and assembled under standard factory conditions without baking or humidity-controlled packaging. This simplifies logistics and eliminates pre-reflow bake cycles in manufacturing.
What is the maximum surge current rating for the 1N5345E3/TR12?
The 1N5345E3/TR12 is rated for a maximum non-recurrent surge current (IZSM) of 9.5 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per Microsemi's published electrical characteristics table and enables reliable operation in environments subject to inductive switching transients or ESD events without additional protection devices.
How does the thermal resistance of the 1N5345E3/TR12 compare between lead and ambient mounting?
The 1N5345E3/TR12 has a junction-to-lead thermal resistance of 25 °C/W when mounted with 3/8 inch (10 mm) lead length from the body, but rises to 85 °C/W junction-to-ambient when mounted on a standard FR4 PCB with 1 oz copper. This difference confirms that effective heat sinking requires direct lead termination to metal chassis or heatsinks - not reliance on PCB copper alone.
Is the 1N5345E3/TR12 suitable for use as a voltage reference in precision analog circuits?
Yes, the 1N5345E3/TR12 is suitable for precision analog reference use due to its low voltage regulation (ΔVZ = 0.20 V), tight ±5% tolerance, and 10 μA reverse leakage at 6.25 V. When operated at its 150 mA test current with adequate heat sinking, it delivers stable 8.7 V output with minimal drift - ideal for ADC references or op-amp bias networks in industrial instrumentation where cost and reliability outweigh ultra-low-noise requirements.
1N5345E3/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):
- 8.7 V
- Tolerance:
- ±20%
- 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
1N5345E3/TR12 FAQ
1.How can I place an order for 1N5345E3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5345E3/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 1N5345E3/TR12 reliable?
The price and inventory of 1N5345E3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5345E3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5345E3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5345E3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5345E3/TR12?
1N5345E3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5345E3/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 1N5345E3/TR12?
For technical support, including 1N5345E3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5345E3/TR12 requirements.
6.How does Aetrix verify that 1N5345E3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5345E3/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 1N5345E3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5345E3/TR12?
All 1N5345E3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5345E3/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 1N5345E3/TR12 part is unused and in its original packaging.
Return procedure for 1N5345E3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5345E3/TR12 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
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
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
