My Inquiry
My Account
Microchip Technology 1N5343/TR12
- Part No.:
- 1N5343/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5343/TR12.pdf
- Description:
- DIODE ZENER 7.5V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,494
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5343/TR12 from Microsemi is a 5 W, 7.5 V ±5% axial-leaded silicon Zener diode optimized for voltage regulation in power supply reference and overvoltage protection circuits. It delivers stable regulation at 175 mA test current, with 1.5 Ω dynamic impedance, 10 μA reverse leakage at 5.4 V, and 630 mA maximum Zener current when adequately heat-sunk.
For engineers reviewing the 1N5343/TR12 datasheet, 1N5343/TR12 pinout, 1N5343/TR12 application, or 1N5343/TR12 equivalent, this part supports precision DC voltage clamping, low-noise analog reference generation, and transient-suppressed regulator feedback paths in industrial and telecom power systems.
Technical Context
This discrete Zener diode operates in reverse-biased breakdown mode to maintain a stable 7.5 V across its terminals over a wide current range (10 mA to 630 mA) and temperature span (–65 °C to +150 °C). Its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W dissipation with minimal lead-length heat sinking.
The device features a void-free thermosetting epoxy T-18 package, cathode band polarity marking, and RoHS-compliant matte-tin plating. It exhibits 0.15 V voltage regulation (ΔVZ) between 10% and 50% of IZM, confirming tight regulation stability under varying load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5 V ±5% - precise regulation setpoint for feedback loops and reference rails |
| Test Current (IZT) | 175 mA - nominal operating point where VZ and ZZ are specified |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal output voltage variation under dynamic load changes |
| Max Reverse Leakage (IR) | 10 μA @ 5.4 V - guarantees low standby power loss in high-impedance bias networks |
| Max Zener Current (IZM) | 630 mA - peak continuous DC current supported with proper thermal management |
| Voltage Regulation (ΔVZ) | 0.15 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
| Power Dissipation | 5.0 W @ TL = 25 °C (3/8″ lead length) - defines thermal design boundary for PCB layout |
Pinout & Package
T-18 axial-leaded plastic package with cathode indicated by a single black band; leads are tin-lead or RoHS-compliant matte-tin plated per MIL-STD-750 Method 2026; weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side terminal | Connected to circuit ground or lower potential node in reverse-bias configuration |
| Cathode | High-side terminal | Banded end; connected to regulated voltage node or feedback input; must be held positive relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB family mechanical and electrical definitions |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - robust against electrostatic discharge during handling |
| High surge current rating | 10.7 A non-recurrent half-sine (8.3 ms) - withstands transient overvoltage events without failure |
| Thermal resistance (junction-to-lead) | 25 °C/W - enables 5 W operation with simple 3/8″ lead-length heat sinking |
Applications
| Industrial Power Supply Reference | Telecom Line Card Overvoltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated DC-DC converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode providing precise 7.5 V reference to optocoupler input or error amplifier. Use Value: Maintains ±1% output voltage accuracy across –40 °C to +85 °C ambient with <0.15 V regulation drift. |
Use Scenario: Clamping surge-induced transients on 48 V telecom power bus before downstream DC-DC stages. IC Role / Device Role / Timing Role: Standby shunt protector absorbing short-duration line surges up to 10.7 A peak. Use Value: Limits bus voltage to ≤8.6 V during 8.3 ms surges, preventing damage to 12 V-rated regulators. |
| Automotive Body Control Module (BCM) Voltage Monitor | Test Equipment Precision Bias Source |
Use Scenario: Detecting undervoltage/overvoltage conditions on 12 V battery rail in BCM microcontroller supervision circuit. IC Role / Device Role / Timing Role: Zener-based comparator reference enabling accurate 7.5 V threshold detection. Use Value: Enables reliable fault detection across –40 °C to +125 °C with <10 μA leakage ensuring low quiescent current. |
Use Scenario: Generating stable, low-noise DC bias for calibrating multimeter front-end amplifiers. IC Role / Device Role / Timing Role: Low-impedance 7.5 V reference source with 1.5 Ω ZZ minimizing signal perturbation. Use Value: Delivers <0.02% voltage deviation over 10–500 mA load range, supporting 6½-digit measurement accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5343B | Same 7.5 V ±5%, identical electrical specs, but in bulk (non-tape-and-reel) packaging | No TR suffix - not optimized for automated SMT placement; requires manual or bulk-feed assembly | Select 1N5343/TR12 for high-volume production requiring EIA-296 tape-and-reel delivery. |
| MMBZ5227BS | SMD SOT-23 package, 3.0 W rating, 7.5 V ±5%, 20 Ω ZZ, 100 mA IZM | Lower power and higher impedance - suitable only for low-current bias/reference, not 5 W regulation | Choose MMBZ5227BS only for space-constrained PCBs where 5 W dissipation is unnecessary. |
Compared with 1N5343B and MMBZ5227BS, the 1N5343/TR12 uniquely combines JEDEC-standard axial form factor, 5 W power handling, 1.5 Ω impedance, and EIA-296 tape-and-reel compatibility-making it optimal for industrial power supply manufacturing where thermal robustness and automated assembly coexist.
Availability
1N5343/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, telecom line cards, automotive body control modules, and test equipment requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5343/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 radiation-hardened components for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems-emphasizing thermal resilience, surge immunity, and JEDEC-standard mechanical consistency.
FAQ
What is the Zener voltage tolerance of 1N5343/TR12?
The 1N5343/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its full type designation. This means its measured VZ falls within 7.125 V to 7.875 V at 175 mA and 25 °C lead temperature. The tolerance is guaranteed per JEDEC specification and verified during 100% testing.
Can 1N5343/TR12 be used without a heatsink?
Yes, the 1N5343/TR12 can operate at up to 1.47 W continuously without a heatsink when mounted on a standard FR4 PCB with 4 mm² copper pads and 1 mm track width, per its 85 °C/W junction-to-ambient thermal resistance. For full 5 W operation, a 3/8″ (10 mm) lead length from the body is required to achieve 25 °C/W junction-to-lead resistance.
What does the "TR12" suffix mean in 1N5343/TR12?
The "TR12" suffix indicates EIA-296 compliant tape-and-reel packaging: 12 mm carrier tape width, 12 mm pocket pitch, and 1000 units per reel. This format enables direct feeding into automated pick-and-place machines and ensures consistent orientation (cathode band facing up) for high-yield assembly of the 1N5343/TR12.
Is 1N5343/TR12 RoHS compliant?
Yes, the 1N5343/TR12 is RoHS compliant, as confirmed by the "e3" designation in Microsemi's official documentation. Its leads feature annealed matte-tin plating per MIL-STD-750 Method 2026, and the void-free epoxy body meets UL94V-0 flammability requirements without brominated flame retardants.
What is the maximum surge current rating for 1N5343/TR12?
The 1N5343/TR12 has a maximum non-recurrent surge current (IZSM) of 10.7 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating is validated per JEDEC test method and reflects the device's ability to absorb transient energy without parametric shift or catastrophic failure in overvoltage protection applications.
1N5343/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:
- ±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
1N5343/TR12 FAQ
1.How can I place an order for 1N5343/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5343/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 1N5343/TR12 reliable?
The price and inventory of 1N5343/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5343/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5343/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5343/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5343/TR12?
1N5343/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5343/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 1N5343/TR12?
For technical support, including 1N5343/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5343/TR12 requirements.
6.How does Aetrix verify that 1N5343/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5343/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 1N5343/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5343/TR12?
All 1N5343/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5343/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 1N5343/TR12 part is unused and in its original packaging.
Return procedure for 1N5343/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5343/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…
