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Microchip Technology 1N5344/TR12
- Part No.:
- 1N5344/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344/TR12.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:3,589
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Product details
Overview
1N5344/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.2 V, ±5% tolerance (B-suffix), 150 mA maximum Zener current (IZM), 1.5 Ω dynamic impedance (ZZ) at 150 mA test current, and operates from –65 °C to +150 °C - used for precision voltage reference and overvoltage protection in DC power supplies and analog signal conditioning circuits.
For engineers reviewing the 1N5344/TR12 datasheet, 1N5344/TR12 pinout, 1N5344/TR12 application, or 1N5344/TR12 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current rating (10 A), reverse leakage (≤10 µA at 5.9 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage across wide operating current (1 mA to 150 mA) and temperature ranges. Its low dynamic impedance (1.5 Ω) ensures minimal voltage deviation under load transients, while its 25 °C/W thermal resistance enables reliable 5 W operation with 3/8″ lead length heat sinking.
The device features cathode band polarity marking, UL94V-0 void-free epoxy encapsulation, and meets moisture sensitivity Level 1 per J-STD-020B - eliminating dry-pack requirements. It is rated for 260 °C soldering (10 s) and exhibits ESD insensitivity per MIL-STD-750 Method 1020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% - defines precise regulation point for feedback loops and reference generation |
| Test Current (IZT) | 150 mA - operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 1.5 Ω max at IZT - ensures <150 mV ΔVZ over 10–50% IZM range |
| Max Zener Current (IZM) | 100 mA - maximum continuous DC current at 25 °C lead temperature (TL) |
| Reverse Leakage (IR) | ≤10 µA at 5.9 V - guarantees low standby power loss in high-impedance bias networks |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - supports full 5 W dissipation with simple lead-length heatsinking |
| Surge Current (IZSM) | 10 A peak (8.3 ms half-sine) - withstands transient overloads without degradation |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, matte-tin plated leads, cathode indicated by colored band. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common; reverse-biased operation requires cathode at higher potential |
| Cathode | Regulated output node | Banded end; maintains stable 8.2 V relative to anode when reverse-biased above knee voltage |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter regulation than ±10% or ±20% variants in feedback divider networks |
| Low dynamic impedance (1.5 Ω) | Minimizes output voltage shift under varying load currents in precision references |
| 25 °C/W junction-to-lead thermal resistance | Permits full 5 W operation with only 3/8″ (10 mm) lead length as heatsink |
| RoHS-compliant e3 suffix option | Meets environmental compliance without derating or performance trade-offs |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for handling precautions during manual assembly or prototyping |
Applications
| DC Power Supply Regulation | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing +8.2 V rail in linear regulator feedback path or post-regulator reference node. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable setpoint for error amplifier comparison. Use Value: Maintains ±0.41 V regulation window over –65 °C to +150 °C and 1–100 mA current range, reducing output drift. |
Use Scenario: Clamping transient spikes on 9 V battery-powered sensor interface lines. IC Role / Device Role / Timing Role: Two-terminal crowbar element diverting excess energy to ground before IC damage threshold. Use Value: Withstands 10 A surge (8.3 ms) and limits clamped voltage to ≤8.6 V, protecting downstream op-amps and ADCs. |
| Analog Signal Level Shifting | Temperature-Stable Bias Network |
Use Scenario: Generating fixed 8.2 V offset for AC-coupled audio signal conditioning stages. IC Role / Device Role / Timing Role: DC bias source establishing quiescent operating point for amplifiers and comparators. Use Value: Low ΔVZ (0.20 V) between 10% and 50% IZM ensures consistent bias level across supply variations. |
Use Scenario: Providing temperature-compensated reference current in discrete transistor bias circuits. IC Role / Device Role / Timing Role: Stable voltage node enabling predictable base-emitter voltage drop calculation. Use Value: Junction-to-lead thermal resistance allows direct thermal coupling to heatsink, minimizing thermal drift in high-power bias designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B | No TR12 tape-and-reel packaging; bulk or ammo pack only | Lacks standardized reel orientation and EIA-296 compliance for automated placement | Select 1N5344/TR12 for SMT line compatibility; choose 1N5344B for hand-soldered prototypes or low-volume builds |
| MMBZ5231BS | SOT-23 surface-mount package; 500 mW rating; 8.2 V ±5%; 100 Ω ZZ | Lower power and higher impedance limit use to low-current biasing, not 5 W regulation | Use MMBZ5231BS only in space-constrained, low-power (<10 mA) applications where board area outweighs regulation precision |
Compared with 1N5344/TR12, the 1N5344B offers identical electrical specs but lacks tape-and-reel logistics support, while MMBZ5231BS trades power capability and impedance performance for miniaturization - making 1N5344/TR12 the sole choice for robust 5 W, low-ZZ, through-hole voltage regulation.
Availability
1N5344/TR12 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection clamping, and analog signal level shifting requiring stable component supply, long-term obsolescence mitigation, and RoHS-compliant sourcing.
Supply support for 1N5344/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 for ruggedized, high-stability voltage regulation in mission-critical power systems - emphasizing thermal robustness, surge resilience, and extended temperature operation.
FAQ
What is the Zener voltage tolerance for 1N5344/TR12?
The 1N5344/TR12 has a ±5% Zener voltage tolerance, confirmed by the "B" suffix in its full designation (1N5344B). This means its measured VZ falls between 7.79 V and 8.61 V at 150 mA and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range (–65 °C to +150 °C) and is independent of packaging format (TR12 does not affect electrical spec).
Does 1N5344/TR12 require dry packing per J-STD-020B?
No, the 1N5344/TR12 has IPC/JEDEC moisture sensitivity Level 1 classification due to its void-free thermosetting epoxy encapsulation. This eliminates the need for dry packing or baking prior to soldering - unlike higher-level MS ratings. The device may be stored indefinitely at ambient conditions and processed directly using standard 260 °C reflow or wave profiles.
What is the maximum continuous power dissipation for 1N5344/TR12 at 70 °C ambient?
At 70 °C ambient on FR4 board (1 oz Cu, 4 mm² pads), the 1N5344/TR12 derates to approximately 2.9 W, calculated using its 85 °C/W junction-to-ambient thermal resistance and 150 °C max junction temperature. For full 5 W operation, it must be mounted with 3/8″ (10 mm) lead length acting as heatsink - where junction-to-lead Rθ = 25 °C/W applies.
Can 1N5344/TR12 replace 1N5344B in existing designs?
Yes - the 1N5344/TR12 is electrically and mechanically identical to 1N5344B, differing only in packaging (tape-and-reel per EIA-296 vs. bulk). All electrical parameters, thermal characteristics, and physical dimensions match exactly. No PCB or schematic changes are needed; only feeder setup adjustments for automated placement.
What is the reverse leakage current specification for 1N5344/TR12?
The 1N5344/TR12 specifies maximum reverse leakage current (IR) of 10 µA at 5.9 V (72% of VZ). This value is measured per JEDEC standards and remains valid across the full temperature range. At VZ = 8.2 V, leakage is typically <1 µA - critical for low-power bias networks where leakage-induced error must stay below 0.1% of total current.
1N5344/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):
- 8.2 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 1.5 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 5.9 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
1N5344/TR12 FAQ
1.How can I place an order for 1N5344/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344/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 1N5344/TR12 reliable?
The price and inventory of 1N5344/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5344/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344/TR12?
1N5344/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344/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 1N5344/TR12?
For technical support, including 1N5344/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344/TR12 requirements.
6.How does Aetrix verify that 1N5344/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5344/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 1N5344/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5344/TR12?
All 1N5344/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344/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 1N5344/TR12 part is unused and in its original packaging.
Return procedure for 1N5344/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5344/TR12 Tags
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