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Microchip Technology 1N5349AE3/TR8
- Part No.:
- 1N5349AE3/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5349AE3/TR8.pdf
- Description:
- DIODE ZENER 12V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,098
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Product details
Overview
1N5349AE3/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 12 V, ±10% tolerance (A suffix), 100 mA maximum Zener current (IZM), 2.5 Ω dynamic impedance (ZZ) at 100 mA test current, and operates across –65 °C to +150 °C for voltage reference and overvoltage protection in DC power supplies.
For engineers reviewing the 1N5349AE3/TR8 datasheet, 1N5349AE3/TR8 pinout, 1N5349AE3/TR8 application, or 1N5349AE3/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (18.7 A), reverse leakage (<2.0 µA at 9.1 V), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown, with Zener voltage specified at 12 V ±10% under 100 mA DC test current (IZT). Its low 25 °C/W thermal resistance enables stable regulation up to 5 W when leads are mounted 10 mm from body.
It exhibits 2.5 Ω dynamic impedance at IZT and 0.25 V voltage regulation (ΔVZ) between 10% and 50% of IZM. The cathode band denotes polarity, requiring the banded end to be biased positive relative to the anode for proper regulation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12 V ±10% - defines nominal regulation point; actual range 10.8–13.2 V at 25 °C |
| Test Current (IZT) | 100 mA - standardized bias condition for VZ measurement and impedance characterization |
| Dynamic Impedance (ZZ) | 2.5 Ω - small-signal AC resistance determining voltage stability under load variation |
| Max Regulator Current (IZM) | 750 mA - maximum continuous DC current before thermal runaway at TL = 25 °C |
| Surge Current (IZSM) | 18.7 A - peak non-repetitive half-sine (8.3 ms) capability for transient suppression |
| Reverse Leakage (IR) | <2.0 µA at 9.1 V - ensures minimal quiescent power loss in standby regulation circuits |
| Thermal Resistance | 25 °C/W junction-to-lead - enables 5 W dissipation with modest heatsinking at lead termination |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), 0.7 g weight, cathode indicated by color band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| 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 12 V relative to anode when reverse current ≥100 mA |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB series mechanical and electrical definitions |
| RoHS-compliant construction | e3 suffix confirms lead-free matte-tin plating and halogen-free epoxy encapsulation |
| Level 1 moisture sensitivity | No dry pack required per IPC/JEDEC J-STD-020B - simplifies SMT reflow handling |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands >4 kV HBM without parameter shift |
| High surge endurance | Rated for 18.7 A (8.3 ms half-sine) - suitable for input-stage transient clamping |
Applications
| DC Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing unregulated 15 V DC rail for analog sensor biasing in industrial controllers. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing fixed 12 V reference despite input ripple and load variation. Use Value: Maintains ±0.25 V regulation (ΔVZ) across 75–375 mA load current, enabling <0.5% error in 12-bit ADC references. |
Use Scenario: Clamping 24 V automotive supply transients exceeding 16 V during load dump events. IC Role / Device Role / Timing Role: Passive crowbar element diverting surge energy to ground before downstream LDOs or microcontrollers. Use Value: Absorbs 18.7 A surge (8.3 ms) without failure, limiting clamp voltage to ≤13.2 V (VZ max) to protect 12 V-rated ICs. |
| Programmable Voltage Reference | Current Source Biasing |
Use Scenario: Setting precise threshold in comparator-based battery charge cutoff at 12.6 V nominal. IC Role / Device Role / Timing Role: Stable voltage node defining trip point for op-amp comparators in Li-ion charging control. Use Value: ±10% tolerance yields 11.3–13.9 V window; combined with low ΔVZ ensures <0.3 V hysteresis drift over temperature. |
Use Scenario: Establishing constant current for LED string bias in signage applications using 12 V supply. IC Role / Device Role / Timing Role: Voltage reference for emitter-degenerated BJT current source delivering 350 mA to LEDs. Use Value: 2.5 Ω ZZ minimizes current variation (<±1.5%) across 10–50 °C ambient, ensuring consistent luminance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same 12 V ±5% tolerance (B suffix), identical package and thermal specs, but non-RoHS tin-lead plating | Not suitable for RoHS-compliant production; otherwise drop-in replacement where Pb is permitted | Select 1N5349B only if legacy Pb-based assembly is mandated and environmental compliance is waived. |
| MMBZ5242B (SOT-23) | Surface-mount 12 V ±5% Zener, 0.35 W rating, 30 Ω ZZ, 100 mA IZM - lower power, different package | Requires PCB redesign; unsuitable for high-current or high-surge roles due to 0.35 W limit | Choose MMBZ5242B only for space-constrained low-power signal-level referencing, not power rail regulation. |
Compared with 1N5349B and MMBZ5242B, the 1N5349AE3/TR8 uniquely delivers 5 W power handling, RoHS compliance, and axial-leaded through-hole mounting in a single device-making it optimal for industrial power supply regulation where thermal robustness and regulatory compliance are jointly required.
Availability
1N5349AE3/TR8 is available at Aetrix Electronics and suitable for DC power supply regulation, overvoltage protection circuits, and programmable voltage reference designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 1N5349AE3/TR8 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 discrete components for aerospace, defense, and industrial markets.
The 1N53xx series was designed specifically for ruggedized 5 W axial Zener regulation in harsh-environment power systems-emphasizing surge resilience, wide temperature operation, and JEDEC-standard mechanical compatibility.
FAQ
What is the Zener voltage tolerance for 1N5349AE3/TR8?
The 1N5349AE3/TR8 has a ±10% Zener voltage tolerance, as indicated by the "A" suffix. This means its measured VZ at 100 mA and 25 °C falls within 10.8 V to 13.2 V. The e3/TR8 suffix confirms RoHS compliance and tape-and-reel packaging, but does not affect voltage tolerance.
Can 1N5349AE3/TR8 be used in surface-mount designs?
No-1N5349AE3/TR8 uses an axial-leaded T-18 package and is intended for through-hole mounting. It lacks solder pads or land patterns for SMT assembly. For surface-mount equivalents, Microsemi offers the SMBJ5349B series, which shares the same 12 V ±10% regulation but in DO-214AA (SMB) package.
What is the maximum steady-state power dissipation for 1N5349AE3/TR8 on a standard PCB?
When mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, the 1N5349AE3/TR8 dissipates up to 1.47 W at TA = 25 °C. Its full 5 W rating applies only with lead temperature (TL) held at 25 °C via heatsinking at 10 mm from the body-per Figure 1 derating curve.
How does the 1N5349AE3/TR8 perform under surge conditions?
The 1N5349AE3/TR8 is rated for 18.7 A peak non-repetitive surge current (IZSM) in an 8.3 ms half-sine waveform. This enables reliable transient clamping in automotive and industrial power inputs. Its 25 °C/W junction-to-lead thermal resistance helps absorb and dissipate surge energy without thermal runaway.
Is the 1N5349AE3/TR8 compatible with lead-free reflow processes?
Yes-the e3 suffix certifies RoHS compliance, including matte-tin lead plating qualified for soldering at 260 °C for 10 seconds. Its UL94V-0 epoxy body withstands standard lead-free reflow profiles. No dry pack is required (Moisture Sensitivity Level 1), simplifying factory handling.
1N5349AE3/TR8 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):
- 12 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 2 µA @ 8.6 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
1N5349AE3/TR8 FAQ
1.How can I place an order for 1N5349AE3/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5349AE3/TR8 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 1N5349AE3/TR8 reliable?
The price and inventory of 1N5349AE3/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5349AE3/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5349AE3/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5349AE3/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5349AE3/TR8?
1N5349AE3/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5349AE3/TR8 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 1N5349AE3/TR8?
For technical support, including 1N5349AE3/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5349AE3/TR8 requirements.
6.How does Aetrix verify that 1N5349AE3/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5349AE3/TR8 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 1N5349AE3/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5349AE3/TR8?
All 1N5349AE3/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5349AE3/TR8, 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 1N5349AE3/TR8 part is unused and in its original packaging.
Return procedure for 1N5349AE3/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5349AE3/TR8 Tags
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