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Microchip Technology 1N5344B/TR12
- Part No.:
- 1N5344B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344B/TR12.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:5,675
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Product details
Overview
1N5344B/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 8.2 V ±5%, 150 mA test current (IZT), 1.5 Ω dynamic impedance (ZZ), and maximum reverse current of 10 μA at 5.9 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5344B/TR12 datasheet, 1N5344B/TR12 pinout, 1N5344B/TR12 application, or 1N5344B/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (10 A), voltage regulation (ΔVZ = 0.20 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This discrete Zener diode functions as a two-terminal shunt regulator, maintaining stable output voltage across wide load and line variations by operating in reverse breakdown. Its low dynamic impedance (1.5 Ω) ensures minimal voltage shift under changing current conditions, and its 25 °C/W thermal resistance enables reliable 5 W dissipation with 3/8″ lead length heat sinking.
The device features cathode band polarity marking, UL94V-0 void-free epoxy encapsulation, and moisture sensitivity level 1-no dry pack required. It supports tape-and-reel packaging (TR12 suffix) and meets MIL-PRF-19500 screening options when prefixed with MQ/MX/MV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% - precise regulation point for feedback networks requiring tight voltage stability |
| Test Current (IZT) | 150 mA - defines operating point where VZ and dynamic impedance are specified |
| Dynamic Impedance (ZZ) | 1.5 Ω - low AC resistance ensures minimal voltage deviation under varying load currents |
| Max Reverse Current (IR) | 10 μA at 5.9 V - confirms sharp knee and low leakage below regulation threshold |
| Max Regulator Current (IZM) | 1000 mA - peak DC current capability with adequate heat sinking at TL ≤ 25 °C |
| Surge Current (IZSM) | 10 A (8.3 ms half-sine) - withstands transient overvoltage events without degradation |
| Voltage Regulation (ΔVZ) | 0.20 V - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (JEDEC DO-204AL), void-free UL94V-0 epoxy body, tin-lead or RoHS-compliant matte-tin plated leads, cathode identified by color band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side | Connected to ground or lower potential node in shunt regulation configuration |
| Cathode | Zener breakdown terminal / regulated output side | Banded end; connected to input rail or feedback node to clamp voltage at 8.2 V |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance (B suffix) | Enables tighter feedback loop control vs. ±10% or ±20% variants, reducing need for external trimming |
| 25 °C/W junction-to-lead thermal resistance | Supports full 5 W dissipation with simple 3/8″ lead-length heatsinking-no PCB copper pour required |
| 10 A non-recurrent surge rating (8.3 ms) | Provides robust transient immunity in industrial power rails without external TVS supplementation |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and floor-life constraints-ready for standard SMT/reflow assembly |
| RoHS-compliant e3 option | Meets global environmental compliance without derating or performance trade-offs |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback network. IC Role / Device Role / Timing Role: Shunt reference providing stable 8.2 V reference to TL431 or similar error amplifier. Use Value: Maintains ±1% output accuracy across line/load/temperature with 1.5 Ω dynamic impedance limiting feedback error. | Use Scenario: Clamps intermediate rail voltage during startup or fault conditions in telecom power modules. IC Role / Device Role / Timing Role: Passive crowbar element diverting excess current when rail exceeds 8.2 V. Use Value: Absorbs 10 A surge transients without failure, preventing downstream IC damage in 48 V systems. |
| Programmable Voltage Reference | Industrial Sensor Excitation |
Use Scenario: Provides stable excitation voltage for precision RTD or strain gauge bridges in data acquisition front-ends. IC Role / Device Role / Timing Role: Low-noise, low-drift Zener reference replacing higher-cost IC references where 0.20 V ΔVZ suffices. Use Value: Delivers 8.2 V reference with <10 μA leakage, minimizing bridge current error and self-heating effects. | Use Scenario: Supplies regulated bias to analog sensor signal conditioning stages in harsh-environment PLC I/O modules. IC Role / Device Role / Timing Role: Temperature-stable shunt regulator maintaining constant 8.2 V across –40 °C to +85 °C ambient. Use Value: Ensures consistent sensor gain and offset calibration over extended temperature range due to low TCZ and 150 °C max storage rating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B (bulk) | Identical electrical specs; differs only in packaging (bulk vs. TR12 tape-and-reel) | No difference in circuit function; TR12 enables automated pick-and-place assembly | Select 1N5344B/TR12 for SMT production; choose bulk for hand-soldered prototypes or repair |
| MMBZ5231BS-7-F (Diodes Inc.) | Surface-mount SOD-123 package; 8.2 V ±5%; 200 mW rating; 30 Ω ZZ | Not suitable for 5 W power dissipation; limited to low-current bias/reference roles | Use MMBZ5231BS-7-F only in space-constrained, low-power designs where thermal budget prohibits axial devices |
Compared with 1N5344B/TR12, the bulk variant offers identical performance with manual handling advantages, while MMBZ5231BS-7-F trades power capability for miniaturization-making it viable only where dissipation stays below 200 mW and board area is critical.
Availability
1N5344B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, and programmable voltage references requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5344B/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed for ruggedized voltage regulation in mission-critical power systems, emphasizing thermal robustness, surge resilience, and extended temperature operation from –65 °C to +150 °C.
FAQ
What is the Zener voltage tolerance of the 1N5344B/TR12?
The 1N5344B/TR12 has a Zener voltage tolerance of ±5%, as indicated by the "B" suffix in its part number. This means its nominal 8.2 V regulation voltage falls within the range of 7.79 V to 8.61 V at 25 °C with 150 mA test current. This tolerance is tighter than the ±10% (A suffix) and ±20% (no suffix) variants, supporting more accurate voltage references in feedback and protection circuits.
Can the 1N5344B/TR12 be used in surface-mount designs?
No-the 1N5344B/TR12 is an axial-leaded T-18 (DO-204AL) package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5344B or SMBG5344B in SMB/SMBG packages. These share identical electrical characteristics but require different footprint and reflow profiles compared to the through-hole 1N5344B/TR12.
What is the maximum power dissipation of the 1N5344B/TR12 at room temperature?
The 1N5344B/TR12 is rated for 5.0 W steady-state power dissipation at 25 °C lead temperature (TL), provided leads are trimmed to 3/8″ (10 mm) from the body. When mounted on a standard FR4 PCB with 1 oz copper, its power rating drops to 1.47 W at 25 °C ambient due to higher junction-to-ambient thermal resistance (85 °C/W).
Does the 1N5344B/TR12 meet RoHS requirements?
Yes-the "e3" suffix in the full manufacturer designation (1N5344B e3) confirms RoHS compliance. The device uses annealed matte-tin plating on leads and complies with EU Directive 2011/65/EU. The TR12 tape-and-reel packaging is also RoHS-compliant and suitable for lead-free reflow processes up to 260 °C for 10 seconds.
How does the voltage regulation (ΔVZ) specification impact circuit design with the 1N5344B/TR12?
The 1N5344B/TR12 has a voltage regulation (ΔVZ) of 0.20 V-defined as the difference between Zener voltage measured at 10% and 50% of its maximum regulator current (IZM). This low ΔVZ indicates excellent regulation linearity, enabling stable reference performance across wide current ranges (e.g., 100–500 mA) without significant drift, which simplifies feedback compensation in power supply designs.
1N5344B/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:
- ±5%
- 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
1N5344B/TR12 FAQ
1.How can I place an order for 1N5344B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344B/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 1N5344B/TR12 reliable?
The price and inventory of 1N5344B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5344B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344B/TR12?
1N5344B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344B/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 1N5344B/TR12?
For technical support, including 1N5344B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344B/TR12 requirements.
6.How does Aetrix verify that 1N5344B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5344B/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 1N5344B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5344B/TR12?
All 1N5344B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344B/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 1N5344B/TR12 part is unused and in its original packaging.
Return procedure for 1N5344B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5344B/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
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