My Inquiry
My Account
Microchip Technology 1N5346/TR12
- Part No.:
- 1N5346/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5346/TR12.pdf
- Description:
- DIODE ZENER 9.1V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,351
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5346/TR12 from Microsemi is a 5.0 W axial-leaded silicon Zener diode with a nominal regulation voltage of 9.1 V ±5%, 2.0 Ω maximum dynamic impedance at 150 mA test current, 520 Ω maximum dynamic knee impedance at 1.0 mA, and 9.2 V maximum voltage regulation (ΔVZ) across 10–50% of IZM. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5346/TR12 datasheet, 1N5346/TR12 pinout, 1N5346/TR12 application, or 1N5346/TR12 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (150 A), reverse leakage (7.5 µA @ 6.9 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator in reverse-biased mode, where the cathode band denotes the positive terminal during regulation. Its low 25 °C/W thermal resistance enables stable operation at up to 150 mA dc when lead length is maintained at 3/8 inch (10 mm) from the body.
The 1N5346/TR12 exhibits minimal voltage variation (ΔVZ = 9.2 V max) between 10% and 50% of its maximum Zener current (IZM = 9.2 mA), and maintains tight regulation under transient conditions with a peak non-recurrent surge current rating of 150 A (8.3 ms half-sine).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 9.1 V ±5% - precise regulation point at 150 mA, suitable for stable reference generation |
| Power Dissipation | 5.0 W at TL = 25 °C - supports high-current regulation with adequate heatsinking |
| Dynamic Impedance (ZZ) | 2.0 Ω max @ IZT = 150 mA - ensures low output impedance for ripple suppression |
| Max Reverse Leakage (IR) | 7.5 µA @ VR = 6.9 V - guarantees low standby power loss in bias networks |
| Surge Current (IZSM) | 150 A (8.3 ms half-sine) - withstands transient overvoltage events without failure |
| Thermal Resistance | 25 °C/W junction-to-lead - enables predictable thermal design with standard lead mounting |
| Operating Temperature | –65 °C to +150 °C - qualified for industrial and automotive under-hood environments |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free transfer-molded thermosetting epoxy, UL94V-0 rated); cathode identified by color band; leads plated with annealed matte tin (RoHS compliant, solderable per MIL-STD-750 Method 2026).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reverse-bias reference return node | Connected to system ground or lower-potential rail during regulation |
| Cathode | Regulated output node | Banded end; held at stable 9.1 V relative to anode under specified IZ |
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 electrostatic discharge in manufacturing |
| High Surge Withstand | Rated for 150 A (8.3 ms half-sine) - protects downstream circuitry from line transients |
| Tight Voltage Regulation | ΔVZ ≤ 9.2 V across 10–50% IZM - ensures consistent reference stability under load variation |
Applications
| Industrial Power Supply Reference | Automotive Battery Monitor Circuit |
|---|---|
Use Scenario: Provides stable 9.1 V reference for feedback loop in isolated 24 V DC-DC converter. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing error amplifier setpoint. Use Value: Maintains ±0.46 V regulation window (ΔVZ) across operating current range, minimizing output drift. | Use Scenario: Monitors 12 V battery voltage via resistive divider with Zener clamp at microcontroller ADC input. IC Role / Device Role / Timing Role: Overvoltage protection and level-shifting element limiting ADC input to safe 9.1 V. Use Value: Blocks >9.1 V transients while drawing only 7.5 µA leakage at 6.9 V, preserving battery life. |
| Programmable Logic Controller (PLC) Input Protection | Test Equipment Calibration Reference |
Use Scenario: Clamps 24 V digital input signals to prevent damage to FPGA I/O banks. IC Role / Device Role / Timing Role: Transient voltage suppressor and steady-state voltage limiter on field-side interface. Use Value: Absorbs 150 A surge (8.3 ms) without degradation, ensuring long-term reliability in noisy factory environments. | Use Scenario: Serves as secondary voltage standard in benchtop multimeter calibration fixture. IC Role / Device Role / Timing Role: Precision DC reference source traceable to primary standards. Use Value: Delivers 9.1 V ±0.455 V (±5%) with <2.0 Ω dynamic impedance, enabling sub-0.1% measurement repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5346B | Same electrical specs; differs only in packaging - bulk (no tape/reel) vs. TR12 tape-and-reel format | No functional difference; TR12 enables automated pick-and-place assembly | Select 1N5346/TR12 for SMT production lines requiring reel-fed placement |
| MMBZ5240B | Surface-mount SOD-123 package; 10 V ±5%, 0.5 W rating, 17 Ω ZZ - lower power, higher impedance | Not suitable for 5 W continuous dissipation; limited to low-power biasing | Choose MMBZ5240B only for space-constrained PCBs where power demand is <0.5 W |
Compared with 1N5346B, the 1N5346/TR12 offers identical regulation performance with optimized packaging for automated assembly; compared with MMBZ5240B, it delivers 10× higher power handling and one-eighth the dynamic impedance, making it appropriate for high-stability, high-current reference designs.
Availability
1N5346/TR12 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitoring systems, and programmable logic controller (PLC) input protection circuits requiring stable component supply and long-lifecycle support.
Supply support for 1N5346/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 1N53xxB series was designed specifically for ruggedized, high-power voltage regulation in harsh-environment applications where thermal stability, surge immunity, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance for 1N5346/TR12?
The 1N5346/TR12 has a nominal Zener voltage of 9.1 V with a tolerance of ±5%, as indicated by the "B" suffix in its full designation. This means the actual regulation voltage falls between 8.645 V and 9.555 V when measured at 150 mA and 25 °C lead temperature. The tolerance is guaranteed per JEDEC specification and verified during production testing.
Does 1N5346/TR12 require dry packing before reflow soldering?
No, the 1N5346/TR12 has a moisture sensitivity level (MSL) of Level 1 per IPC/JEDEC J-STD-020B, meaning it is not moisture-sensitive and does not require dry packing or baking prior to surface-mount assembly. Its void-free epoxy encapsulation ensures robustness during standard reflow profiles up to 260 °C for 10 seconds.
What is the maximum steady-state current for 1N5346/TR12 at room temperature?
The maximum steady-state Zener current (IZM) for 1N5346/TR12 is 9.2 mA when mounted on an FR4 PCB with 1 oz copper, 4 mm² pads, and specified trace geometry - yielding 1.47 W power dissipation. At 25 °C lead temperature with 3/8 inch lead length, it supports up to 150 mA (5.0 W). Derating applies above 25 °C per Figure 1 in the datasheet.
Can 1N5346/TR12 be used as a replacement for 1N4739A?
No, 1N5346/TR12 is not a direct replacement for 1N4739A. While both are Zener diodes, the 1N4739A is a 9.1 V, 1 W device with different thermal characteristics, impedance (20 Ω), and package (DO-41). Substituting 1N5346/TR12 in a 1 W design risks excessive power dissipation and thermal runaway unless board layout and heatsinking are revised to support 5 W operation.
What is the forward voltage drop of 1N5346/TR12 at 1.0 A?
The forward voltage drop of 1N5346/TR12 is specified as a maximum of 1.2 V at 1.0 A forward current and 25 °C. This parameter is relevant for applications where the device may conduct in forward bias (e.g., polarity protection), though its primary function is reverse-bias voltage regulation.
1N5346/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):
- 9.1 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 6.6 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
1N5346/TR12 FAQ
1.How can I place an order for 1N5346/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5346/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 1N5346/TR12 reliable?
The price and inventory of 1N5346/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5346/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5346/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5346/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5346/TR12?
1N5346/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5346/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 1N5346/TR12?
For technical support, including 1N5346/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5346/TR12 requirements.
6.How does Aetrix verify that 1N5346/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5346/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 1N5346/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5346/TR12?
All 1N5346/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5346/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 1N5346/TR12 part is unused and in its original packaging.
Return procedure for 1N5346/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5346/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…
