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Microchip Technology 1N5343C/TR12
- Part No.:
- 1N5343C/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343C/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:2,183
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Product details
Overview
1N5343C/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with a nominal regulation voltage of 7.5 V, ±2% tolerance (C suffix), 175 mA test current (IZT), 1.5 Ω maximum dynamic impedance (ZZ), and 630 mA maximum Zener current (IZM) when adequately heat-sunk. It regulates voltage in power supply reference and overvoltage protection circuits across industrial temperature ranges.
For engineers reviewing the 1N5343C/TR12 datasheet, 1N5343C/TR12 pinout, 1N5343C/TR12 application, or 1N5343C/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (10.7 A), reverse leakage (10 µA at 5.4 V), and RoHS-compliant e3 packaging with tape-and-reel delivery (TR12).
Technical Context
This device operates as a precision voltage reference in shunt-regulator configurations, maintaining stable output under varying load and line conditions. Its low dynamic impedance (1.5 Ω) ensures minimal voltage deviation across 10–50% of IZM, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The 1N5343C/TR12 exhibits tight voltage regulation (ΔVZ = 0.15 V), defined as the difference between voltages measured at 10% and 50% of IZM. It meets JEDEC 1N53xxB registration requirements, features cathode band polarity marking, and is rated for -65 °C to +150 °C operating temperature with Level 1 moisture sensitivity (no dry pack required).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±2% - precise reference for 5 V–9 V rail stabilization |
| Test Current (IZT) | 175 mA - operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 1.5 Ω max - low AC resistance ensures stable regulation under ripple |
| Max Zener Current (IZM) | 630 mA - maximum continuous DC current at TL = 25 °C with heat sink |
| Reverse Leakage (IR) | 10 µA max at 5.4 V - low off-state current preserves efficiency in standby |
| Surge Current (IZSM) | 10.7 A - withstands 8.3 ms half-sine transients per MIL-STD-750 |
| Thermal Resistance | 25 °C/W junction-to-lead - enables 5 W operation with minimal lead-length heatsinking |
| Power Dissipation | 5.0 W at TL < 25 °C (3/8″ lead length) - defines absolute steady-state limit |
Pinout & Package
Package: Axial-leaded T-18 molded epoxy case (JEDEC DO-204AL), void-free UL94V-0 compliant body, tin-lead or RoHS matte-tin plated leads, cathode indicated by colored band. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node; conducts <1.2 V @ 1.0 A forward bias |
| Cathode (banded end) | Zener regulation terminal | Connected to higher-potential node; maintains 7.5 V reverse breakdown with ±2% accuracy |
Key Features
| Feature | Design Value |
|---|---|
| ±2% Zener voltage tolerance | Enables high-accuracy references without external trimming in 5 V–9 V systems |
| JEDEC 1N53xxB registration | Guarantees mechanical interchangeability and standardized test conditions across suppliers |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to PCB assembly |
| RoHS-compliant e3 marking | Confirms lead-free plating and halogen-free epoxy per EU Directive 2011/65/EU |
| Tape-and-reel packaging (TR12) | Supports automated SMT placement despite axial form factor via carrier tape orientation |
Applications
| Industrial Power Supply Reference | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side error amplifiers. IC Role / Device Role / Timing Role: Shunt voltage reference providing precise 7.5 V setpoint to optocoupler input. Use Value: ±2% tolerance ensures output regulation within ±1% over line/load/temperature, reducing need for post-production calibration. | Use Scenario: Clamping transient spikes on 5 V logic rails during hot-plug or ESD events. IC Role / Device Role / Timing Role: Fast-acting crowbar element diverting surge current above 7.5 V threshold. Use Value: 10.7 A surge rating and 0.15 V regulation delta protect downstream CMOS ICs without sacrificing response time. |
| Programmable Voltage Monitor | Temperature-Stable Bias Generator |
Use Scenario: Setting trip point for microcontroller reset circuitry monitoring 7 V–8 V battery voltage. IC Role / Device Role / Timing Role: Precision threshold detector enabling brown-out detection at 7.5 V ±0.15 V. Use Value: Low ΔVZ (0.15 V) and 25 °C/W thermal resistance maintain trip-point stability across -40 °C to +85 °C ambient. | Use Scenario: Generating stable bias current for op-amp input stages in sensor signal conditioning circuits. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source establishing fixed reference for current mirrors. Use Value: 1.5 Ω dynamic impedance minimizes noise coupling into high-gain analog paths while supporting 175 mA test current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B/TR13 | ±5% tolerance (B suffix), same VZ, IZT, ZZ, IZM, package, and thermal specs | Lower accuracy acceptable in non-critical biasing or coarse clamping | Select when ±5% regulation suffices and cost sensitivity outweighs precision needs |
| MMBZ5231BS-7-F | Surface-mount SOD-123 package, 7.5 V ±5%, 100 mW rating, 100 Ω ZZ | Not suitable for 5 W power handling; limited to low-current references | Choose only for space-constrained PCBs where <100 mW dissipation applies |
Compared with 1N5343B/TR13 and MMBZ5231BS-7-F, the 1N5343C/TR12 delivers tighter ±2% voltage control and full 5 W capability in an axial package-critical for industrial power supplies requiring long-term stability and surge resilience without layout redesign.
Availability
1N5343C/TR12 is available at Aetrix Electronics and suitable for industrial power supply reference, overvoltage protection clamp, and programmable voltage monitor applications requiring stable component supply, traceable sourcing, and long-lifecycle support.
Supply support for 1N5343C/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 and mixed-signal components for aerospace, defense, and industrial markets.
The 1N53xx series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing thermal robustness, surge immunity, and JEDEC-standardized interchangeability across military and commercial grades.
FAQ
What is the Zener voltage tolerance of the 1N5343C/TR12?
The 1N5343C/TR12 has a Zener voltage tolerance of ±2%, denoted by the "C" suffix per Microsemi's documentation. This means its regulated voltage falls within 7.35 V to 7.65 V at 25 °C when tested at 175 mA. The tolerance is tighter than the ±5% version (1N5343B) and supports precision reference designs where calibration margin is constrained.
Does the 1N5343C/TR12 require dry packing before PCB assembly?
No, the 1N5343C/TR12 does not require dry packing. It carries IPC/JEDEC J-STD-020B Level 1 moisture sensitivity classification, meaning it can be stored and assembled without baking or humidity-controlled packaging. This simplifies manufacturing logistics and eliminates pre-reflow bake steps for standard FR4 board processing.
What is the maximum surge current rating for the 1N5343C/TR12?
The 1N5343C/TR12 has a maximum non-recurrent surge current (IZSM) rating of 10.7 A, specified for an 8.3 ms half-sine waveform. This value is derived from its 5 W power rating and 7.5 V Zener voltage, enabling robust transient suppression in power rails subject to inductive switching or lightning-induced surges without degradation.
How is thermal performance defined for the 1N5343C/TR12?
The 1N5343C/TR12 specifies a thermal resistance of 25 °C/W junction-to-lead at 3/8″ (10 mm) lead length from the body. When mounted with adequate copper heatsinking on FR4, it sustains 5 W continuous dissipation at lead temperature <25 °C. Derating begins above that temperature per Figure 1 in the Microsemi datasheet.
Is the 1N5343C/TR12 RoHS compliant?
Yes, the 1N5343C/TR12 is RoHS compliant, indicated by the "e3" suffix in its full manufacturer designation (1N5343C/TR12 e3). It uses RoHS-compliant matte-tin plated leads and halogen-free epoxy encapsulation, meeting EU Directive 2011/65/EU and related global environmental standards.
1N5343C/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):
- 7.5 V
- Tolerance:
- ±2%
- 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
1N5343C/TR12 FAQ
1.How can I place an order for 1N5343C/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343C/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 1N5343C/TR12 reliable?
The price and inventory of 1N5343C/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343C/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343C/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343C/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343C/TR12?
1N5343C/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343C/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 1N5343C/TR12?
For technical support, including 1N5343C/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343C/TR12 requirements.
6.How does Aetrix verify that 1N5343C/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343C/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 1N5343C/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343C/TR12?
All 1N5343C/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343C/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 1N5343C/TR12 part is unused and in its original packaging.
Return procedure for 1N5343C/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343C/TR12 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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