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Microchip Technology 1N5343E3/TR8
- Part No.:
- 1N5343E3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343E3/TR8.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,799
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Product details
Overview
1N5343E3/TR8 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 7.5 V ±5%, 175 mA test current (IZT), 1.5 Ω dynamic impedance (ZZ), and 630 mA maximum Zener current (IZM) when adequately heat-sunk. It operates across –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in DC power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N5343E3/TR8 datasheet, 1N5343E3/TR8 pinout, 1N5343E3/TR8 application, or 1N5343E3/TR8 equivalent, this page delivers verified electrical specs, thermal derating behavior, RoHS-compliant packaging details, and validated alternative parts for industrial power regulation design.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode, with Zener voltage specified at 7.5 V measured at 175 mA dc under TL = 25 °C conditions. Its low 1.5 Ω dynamic impedance ensures stable regulation across load variations, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5.0 W operation with minimal lead length heat sinking.
The 1N5343E3/TR8 features a moisture sensitivity level (MSL) 1 rating per IPC/JEDEC J-STD-020B, eliminating dry pack requirements, and meets MIL-STD-750 Method 1020 for ESD insensitivity. Its cathode band marking and tin-plated leads comply with solderability standards for wave and reflow assembly.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% - precise regulation point at 175 mA, enabling stable reference in feedback loops |
| Power Dissipation (Pd) | 5.0 W at TL < 25 °C (3/8″ lead length) - supports high-current shunt regulation without forced cooling |
| Dynamic Impedance (ZZ) | 1.5 Ω @ 175 mA - low voltage variation under changing load current, critical for tight-tolerance references |
| Max Zener Current (IZM) | 630 mA - maximum continuous reverse current before thermal runaway, assuming proper heat sinking |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - allows direct thermal path to PCB copper or chassis for power handling |
| Reverse Leakage (IR) | 10 μA @ 5.4 V - ensures minimal quiescent current in standby or low-power modes |
| Operating Temperature | –65 °C to +150 °C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free transfer-molded thermosetting epoxy, UL94V-0 rated); cathode indicated by color band; RoHS-compliant matte-tin plated leads; weight 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse-biased operation requires this terminal at lower potential than cathode |
| Cathode (banded end) | Regulated output node | Provides stable 7.5 V relative to anode; must be biased positive w.r.t. anode to enter Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB family mechanical and electrical definitions for interchangeability |
| RoHS-compliant (e3 suffix) | Lead-free matte-tin plating meets EU Directive 2011/65/EU and JEDEC J-STD-609A Class 1 |
| Tape-and-reel packaging (TR8 suffix) | Standard EIA-296 compliant carrier tape, 8 mm width, 4,000 pcs/reel - optimized for automated SMT placement |
| Low voltage regulation (ΔVZ) | 0.15 V - difference between voltage at 10% and 50% of IZM, confirming tight regulation linearity |
| High surge current rating | 200 A peak (8.3 ms half-sine) - withstands transient overvoltages in power supply input stages |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing unregulated 12 V rail in industrial PLC power modules where ±5% output tolerance is required. IC Role / Device Role / Timing Role: Shunt voltage regulator providing fixed 7.5 V reference for error amplifier feedback network. Use Value: Maintains output accuracy within ±0.375 V across 10–100 mA load range due to 1.5 Ω ZZ and 630 mA IZM headroom. |
Use Scenario: Clamping transient spikes on 5 V logic bus lines exposed to ESD or inductive kickback. IC Role / Device Role / Timing Role: Voltage clamp limiting bus voltage to 7.5 V during fault events, protecting downstream CMOS inputs. Use Value: Absorbs up to 200 A surge (8.3 ms) without failure, preventing latch-up or gate oxide damage in connected ICs. |
| Analog Signal Reference | Temperature-Stable Bias Generator |
Use Scenario: Providing precision bias for op-amp input stages in medical sensor front-ends operating from –40 °C to +85 °C. IC Role / Device Role / Timing Role: Low-drift voltage reference source for offset nulling and gain calibration circuits. Use Value: Delivers <0.15 V regulation shift across full temperature range, minimizing calibration drift in 16-bit ADC systems. |
Use Scenario: Generating stable bias current for RF transistor amplifiers in base station transceivers. IC Role / Device Role / Timing Role: Zener-based current source with thermal compensation via series resistor matching TC. Use Value: Enables <±2% bias current stability over –30 °C to +70 °C using inherent Zener TC characteristics and layout-aware copper heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | No e3 RoHS suffix; SnPb lead finish; same 7.5 V ±5%, 175 mA IZT, 1.5 Ω ZZ, and 630 mA IZM | Not suitable for lead-free assembly; otherwise functionally identical in regulation performance and thermal behavior | Select 1N5343B only for legacy SnPb processes where RoHS exemption applies |
| MMSZ5231B-TP | Surface-mount SOD-123 package; 7.5 V ±5%; 20 mA IZT; 30 Ω ZZ; 190 mW Pd - lower power, higher impedance | Limited to low-current references (<20 mA); unsuitable for shunt regulation above 100 mA or surge suppression | Choose MMSZ5231B-TP only for space-constrained PCBs with sub-100 mW dissipation needs |
Compared with 1N5343E3/TR8, 1N5343B offers identical electrical performance but lacks RoHS compliance, while MMSZ5231B-TP trades power handling and low-impedance regulation for miniaturization-making the 1N5343E3/TR8 optimal for robust, high-current, lead-free industrial designs.
Availability
1N5343E3/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, analog signal reference generation, and temperature-stable bias generator designs requiring stable component supply and long-term lifecycle support.
Supply support for 1N5343E3/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, RF, and radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xx series was engineered 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 the 1N5343E3/TR8?
The 1N5343E3/TR8 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its registered family designation (1N5343B). This tolerance applies at 175 mA test current and 25 °C lead temperature. The "e3" suffix confirms RoHS compliance but does not affect voltage tolerance. The 1N5343E3/TR8 maintains this specification across its full operating temperature range, with voltage regulation (ΔVZ) limited to 0.15 V between 10% and 50% of IZM.
Can the 1N5343E3/TR8 be used in surface-mount designs?
No, the 1N5343E3/TR8 is an axial-leaded T-18 package device intended for through-hole mounting. It is not compatible with SMT reflow or pick-and-place processes. For surface-mount equivalents, Microsemi offers the SMBJ5343B or SMBG5343B in DO-214AA/DO-214AB packages - these share the same 7.5 V ±5% regulation but differ in thermal resistance, surge rating, and mounting method. The 1N5343E3/TR8 requires manual or wave soldering with 3/8″ lead length for rated 5.0 W operation.
What is the maximum surge current rating for the 1N5343E3/TR8?
The 1N5343E3/TR8 has a maximum non-recurrent surge current (IZSM) of 200 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper PCB layout with adequate copper area for heat dissipation and is validated per Microsemi's test methodology. The 1N5343E3/TR8 sustains this surge without parametric shift or catastrophic failure, making it suitable for input-stage clamping in industrial power converters subject to lightning-induced transients.
How does the thermal resistance of the 1N5343E3/TR8 affect its power handling?
The 1N5343E3/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W when mounted with 3/8″ (10 mm) lead length from the body. This means each watt dissipated raises the junction temperature 25 °C above lead temperature. At 25 °C ambient and no additional heatsinking, the device self-limits to ~1.47 W on FR4; full 5.0 W operation requires maintaining lead temperature below 25 °C - achievable via chassis mounting or large copper pours. Derating curves in the datasheet define safe operating area versus lead temperature.
Is the 1N5343E3/TR8 suitable for precision reference applications?
Yes, the 1N5343E3/TR8 supports precision reference use due to its 1.5 Ω dynamic impedance, 0.15 V voltage regulation (ΔVZ), and ±5% initial tolerance - all verified per JEDEC standards. Its low knee impedance (ZZK = 400 Ω @ 1.0 mA) ensures stable turn-on, and its MSL Level 1 rating eliminates moisture-related parametric drift post-reflow. However, for sub-1% absolute accuracy, external trimming or temperature compensation is recommended, as the 1N5343E3/TR8's tempco is not specified separately in the provided data.
1N5343E3/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):
- 7.5 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.4 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
1N5343E3/TR8 FAQ
1.How can I place an order for 1N5343E3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343E3/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 1N5343E3/TR8 reliable?
The price and inventory of 1N5343E3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343E3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5343E3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343E3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343E3/TR8?
1N5343E3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343E3/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 1N5343E3/TR8?
For technical support, including 1N5343E3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343E3/TR8 requirements.
6.How does Aetrix verify that 1N5343E3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5343E3/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 1N5343E3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5343E3/TR8?
All 1N5343E3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343E3/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 1N5343E3/TR8 part is unused and in its original packaging.
Return procedure for 1N5343E3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343E3/TR8 Tags
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