My Inquiry
My Account
Microchip Technology 1N5344BE3/TR12
- Part No.:
- 1N5344BE3/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5344BE3/TR12.pdf
- Description:
- DIODE ZENER 8.2V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,865
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5344BE3/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, 1.5 Ω dynamic impedance at 150 mA, and maximum surge current of 400 A (8.3 ms half-sine). 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 1N5344BE3/TR12 datasheet, 1N5344BE3/TR12 pinout, 1N5344BE3/TR12 application, or 1N5344BE3/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), steady-state power rating (5 W at TL < 25 °C), reverse leakage (<10 µA at 5.9 V), and RoHS-compliant matte-tin plating.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown. Its Zener voltage is specified at 150 mA test current with ±5% tolerance (B suffix), and its low dynamic impedance (1.5 Ω) ensures stable regulation across varying load currents. The 25 °C/W junction-to-lead thermal resistance enables high-current operation when mounted with ≥10 mm lead length from body.
It exhibits minimal voltage regulation drift (ΔVZ = 0.20 V between 10% and 50% of IZM), supports 260 °C soldering for 10 s, and meets MIL-STD-750 ESD immunity (Method 1020). The cathode band denotes polarity, and it is rated for 1.2 V forward voltage max at 1.0 A.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 8.2 V ±5% - precise reference point for feedback networks in regulated DC supplies |
| Test Current (IZT) | 150 mA - operating point where VZ and ZZ are guaranteed per JEDEC spec |
| Dynamic Impedance (ZZ) | 1.5 Ω @ 150 mA - low AC resistance ensures tight voltage regulation under dynamic load changes |
| Max Reverse Leakage (IR) | <10 µA @ 5.9 V - negligible standby current in high-impedance bias or sensing circuits |
| Power Dissipation | 5.0 W @ TL < 25 °C - requires thermal management beyond 25 °C via lead length or heatsinking |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables 200 mA continuous operation with 3/8″ (10 mm) lead length |
| Surge Current (IZSM) | 400 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by colored band. Leads are annealed matte-tin plated (RoHS compliant, solderable per MIL-STD-750 Method 2026).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; reverse-biased during regulation |
| Cathode | Banded end | Connected to higher-potential node; defines regulated output voltage reference |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB series mechanical and electrical definitions |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out prior to assembly |
| Nonsensitive to ESD | Qualified per MIL-STD-750 Method 1020 - robust against human-body-model discharge |
| RoHS Compliant (e3) | Lead-free matte-tin plating - meets EU Directive 2011/65/EU and J-STD-609A Class 1 |
| High Surge Withstand | Rated for 400 A non-repetitive surge - protects downstream circuitry during line transients |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Provides stable 8.2 V reference to TL431 or optocoupler LED anode, defining output setpoint. Use Value: Tight ±5% tolerance and low ΔVZ (0.20 V) minimize output voltage drift across line/load/temperature. | Use Scenario: Limits voltage on microcontroller I/O rail during hot-swap or ESD events. IC Role / Device Role / Timing Role: Shunts excess energy to ground when rail exceeds 8.2 V, protecting CMOS inputs. Use Value: 400 A surge rating and low ZZ ensure clamping action remains effective even under high-energy transients. |
| Programmable Voltage Reference | DC-DC Converter Trim Adjustment |
Use Scenario: Sets adjustable threshold in battery charge termination or undervoltage lockout circuits. IC Role / Device Role / Timing Role: Serves as fixed reference for comparator input in analog monitoring paths. Use Value: Stable VZ over –65 °C to +150 °C enables reliable operation in automotive under-hood environments. | Use Scenario: Fine-tunes output voltage of adjustable buck regulators via resistor divider network. IC Role / Device Role / Timing Role: Replaces potentiometer in feedback divider to improve long-term stability and temperature drift. Use Value: Low 1.5 Ω ZZ prevents loading error in high-impedance divider configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5344B | No e3 RoHS suffix; tin-lead plating instead of matte-tin | Not suitable for lead-free assembly processes | Select 1N5344B only if legacy tin-lead reflow is used and RoHS compliance is not required |
| MMSZ5234B-TP | Surface-mount SOD-123 package; 500 mW rating; same 8.2 V ±5% | Lower power handling and different thermal path - unsuitable for 5 W continuous operation | Choose MMSZ5234B-TP only for space-constrained, low-power bias/reference use where 150 mA operation is not needed |
Compared with 1N5344B and MMSZ5234B-TP, the 1N5344BE3/TR12 uniquely combines 5 W power capability, axial-leaded mechanical robustness, RoHS compliance, and JEDEC-standardized performance - making it optimal for industrial power supply designs requiring field-replaceability and high surge resilience.
Availability
1N5344BE3/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-lifecycle support, and traceable sourcing.
Supply support for 1N5344BE3/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 as a JEDEC-standardized family of 5 W axial Zeners to deliver stable voltage regulation across extreme temperatures and high-surge environments - targeting power conversion, protection, and precision reference applications.
FAQ
What is the Zener voltage tolerance of the 1N5344BE3/TR12?
The 1N5344BE3/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 7.79 V to 8.61 V at 150 mA test current and 25 °C lead temperature. The e3 suffix confirms RoHS compliance but does not affect voltage tolerance.
Can the 1N5344BE3/TR12 be used in surface-mount designs?
No - the 1N5344BE3/TR12 uses an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5344B (SMB package, 5 W) or MMSZ5234B (SOD-123, 500 mW); neither is a drop-in replacement due to differing power ratings and thermal characteristics.
What is the maximum continuous current the 1N5344BE3/TR12 can handle?
The 1N5344BE3/TR12 supports up to 610 mA continuous Zener current when adequately heat sunk - calculated from its 5 W power rating divided by minimum VZ (7.79 V). However, its rated test current is 150 mA, and derating applies above 25 °C lead temperature per Figure 1 in the datasheet.
Does the 1N5344BE3/TR12 require moisture preconditioning before reflow?
No - the 1N5344BE3/TR12 has IPC/JEDEC J-STD-020B Moisture Sensitivity Level 1, meaning it is not moisture-sensitive and requires no dry pack or baking prior to soldering. It withstands 260 °C for 10 seconds per MIL-STD-750 Method 2026.
How does the 1N5344BE3/TR12 compare to the 1N4734A in terms of regulation performance?
The 1N5344BE3/TR12 offers tighter tolerance (±5% vs. ±10% for 1N4734A), lower dynamic impedance (1.5 Ω vs. ~7 Ω), and higher power (5 W vs. 1 W). Its 25 °C/W thermal resistance also enables superior thermal performance in lead-mounted configurations, making the 1N5344BE3/TR12 preferable for high-stability, high-current regulation tasks.
1N5344BE3/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
1N5344BE3/TR12 FAQ
1.How can I place an order for 1N5344BE3/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5344BE3/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 1N5344BE3/TR12 reliable?
The price and inventory of 1N5344BE3/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5344BE3/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5344BE3/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5344BE3/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5344BE3/TR12?
1N5344BE3/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5344BE3/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 1N5344BE3/TR12?
For technical support, including 1N5344BE3/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5344BE3/TR12 requirements.
6.How does Aetrix verify that 1N5344BE3/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5344BE3/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 1N5344BE3/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5344BE3/TR12?
All 1N5344BE3/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5344BE3/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 1N5344BE3/TR12 part is unused and in its original packaging.
Return procedure for 1N5344BE3/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5344BE3/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…
