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Microchip Technology 1N5354/TR12
- Part No.:
- 1N5354/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5354/TR12.pdf
- Description:
- DIODE ZENER 17V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:8,348
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Product details
Overview
1N5354/TR12 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 17 V, ±5% tolerance (B suffix), 70 mA test current (IZT), 2.5 Ω maximum dynamic impedance (ZZ), and 5.8 A maximum Zener current (IZM) when adequately heat-sunk. It serves as a precision voltage reference or shunt regulator in power supply feedback loops and overvoltage protection circuits.
For engineers reviewing the 1N5354/TR12 datasheet, 1N5354/TR12 pinout, 1N5354/TR12 application, or 1N5354/TR12 equivalent, key selection criteria include its 17 V Zener voltage, 5 W steady-state power rating at TL < 25°C, low 2.5 Ω dynamic impedance, -65°C to +150°C operating temperature range, and RoHS-compliant e3 marking with TR12 tape-and-reel packaging.
Technical Context
This device operates as a reverse-biased shunt regulator, maintaining stable output voltage across wide variations in input voltage and load current. Its 2.5 Ω dynamic impedance ensures minimal voltage deviation under changing current conditions, and its 25 °C/W junction-to-lead thermal resistance enables reliable 5 W operation with standard 3/8" lead length heat sinking.
The 1N5354/TR12 exhibits 0.5 μA maximum reverse leakage at 12.2 V (VR), 0.35 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM, and withstands 5.8 A surge current (IZSM) for non-recurrent 8.3 ms half-sine pulses - critical for transient suppression in industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17 V ±5% - precise regulation point for 15–19 V system references |
| Test Current (IZT) | 70 mA - operating point where VZ and ZZ are specified; defines biasing requirement |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low AC resistance ensures stable voltage under varying load current |
| Max Zener Current (IZM) | 5.8 A - maximum continuous DC current achievable with proper heat sinking |
| Power Dissipation | 5.0 W at TL < 25°C - requires 3/8" lead length heat sinking for full rating |
| Operating Temperature | -65°C to +150°C - suitable for automotive under-hood and industrial control environments |
| Reverse Leakage (IR) | 0.5 μA max at 12.2 V - negligible standby current in high-impedance reference circuits |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free transfer-molded thermosetting epoxy, UL94V-0 rated); cathode indicated by band; leads plated with annealed matte tin (RoHS compliant); weight 0.7 g; moisture sensitivity level 1 (no dry pack required).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; forms return path during regulation |
| Cathode | Zener regulation terminal / Output reference node | Banded end; connected to regulated voltage node; maintains 17 V relative to anode under reverse bias |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with industry-standard 1N53xxB mechanical and electrical specifications |
| ±5% voltage tolerance | Ensures predictable regulation window (16.15–17.85 V) without post-manufacture trimming |
| Low dynamic impedance | 2.5 Ω supports tight voltage stability (<0.35 V ΔVZ) across 0.58–2.9 A operating range |
| High surge current rating | 5.8 A peak (8.3 ms half-sine) enables robust transient clamping in unprotected inputs |
| Moisture Level 1 | No dry-pack or baking required before PCB assembly - reduces manufacturing overhead |
Applications
| Switch-Mode Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters via optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt reference providing stable 17 V threshold to TL431-like error amplifier input. Use Value: Enables ±1% output accuracy over line/load/temperature with minimal external components. | Use Scenario: Supplies stable excitation voltage to resistive bridge sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision voltage reference replacing higher-cost IC references in analog front-ends. Use Value: Delivers 17 V ±5% with 0.5 μA leakage, minimizing self-heating error in millivolt-level bridge outputs. |
| Overvoltage Protection Clamp | Programmable Threshold Detector |
Use Scenario: Clamps 24 V rail transients above 19 V to protect downstream logic and ADC inputs. IC Role / Device Role / Timing Role: Passive shunt clamp activated during overvoltage events exceeding Zener breakdown. Use Value: Absorbs up to 5.8 A surge without failure, limiting voltage excursion to ≤17.85 V (max VZ). | Use Scenario: Sets trip point for comparator-based undervoltage lockout (UVLO) in battery-powered equipment. IC Role / Device Role / Timing Role: Stable 17 V reference input to LM393 comparator's inverting input. Use Value: Provides repeatable 17 V threshold with <0.35 V regulation drift across 0.58–2.9 A current range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5354B | Same 17 V ±5%, 5 W rating, but in bulk (non-tape-and-reel) packaging; no TR12 suffix | Requires manual loading; unsuitable for automated SMT lines needing reel-fed feeders | Select 1N5354B only for prototyping or low-volume hand assembly |
| MMBZ5246BS | Surface-mount SOT-23 package; 16 V ±5%, 250 mW rating; 30 Ω ZZ; 100 mA IZM | Limited to low-power signal-level references; cannot replace 1N5354/TR12 in 5 W power regulation | Choose MMBZ5246BS only for space-constrained PCBs where power dissipation <0.25 W is sufficient |
Compared with 1N5354B and MMBZ5246BS, the 1N5354/TR12 uniquely combines 5 W power handling, axial-leaded through-hole mounting, tape-and-reel automation compatibility, and 17 V ±5% regulation - making it optimal for industrial power supply and protection designs requiring robust, high-current Zener performance.
Availability
1N5354/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, industrial sensor interfaces, overvoltage protection circuits, and programmable threshold detectors requiring stable component supply and long-term obsolescence management.
Supply support for 1N5354/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 specifically for ruggedized voltage regulation in harsh-environment power systems - emphasizing thermal robustness, surge immunity, and JEDEC-standardized mechanical reliability.
FAQ
What is the Zener voltage tolerance of the 1N5354/TR12?
The 1N5354/TR12 has a ±5% Zener voltage tolerance, confirmed by its "B" suffix per Microsemi documentation. This means its actual regulation voltage falls within 16.15 V to 17.85 V at 70 mA test current and 25°C lead temperature. The tolerance is guaranteed across the full -65°C to +150°C operating range, and the 1N5354/TR12 is not rated for tighter tolerances like ±1% or ±2% unless explicitly marked with C or D suffixes.
Can the 1N5354/TR12 be used without a heatsink?
The 1N5354/TR12 can operate at up to 1.47 W continuously without a heatsink when mounted on a standard FR4 PCB with 4 mm² copper pads and 1 mm track width, per its 85°C/W junction-to-ambient thermal resistance. However, to achieve its full 5 W rating, it requires 3/8" (10 mm) lead length heat sinking to maintain TL < 25°C. Operating near 5 W without adequate heat sinking will exceed junction temperature limits and cause premature failure of the 1N5354/TR12.
What does the "TR12" suffix indicate in 1N5354/TR12?
"TR12" indicates tape-and-reel packaging per EIA-296 standard, with 12 mm tape width and component spacing optimized for automated pick-and-place equipment. This distinguishes the 1N5354/TR12 from bulk-packed variants like 1N5354B. The TR12 format ensures consistent feeding, reduces handling damage, and supports high-volume manufacturing - all while retaining identical electrical specs and T-18 axial package dimensions as the base 1N5354/TR12 device.
Is the 1N5354/TR12 RoHS compliant?
Yes, the 1N5354/TR12 is RoHS compliant, as confirmed by its "e3" designation in Microsemi's official documentation. The device uses annealed matte-tin plating on leads and void-free UL94V-0 epoxy encapsulation, meeting EU Directive 2011/65/EU requirements. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed allowable thresholds, and the 1N5354/TR12 is qualified for use in environmentally regulated commercial and industrial products.
How does the 1N5354/TR12 perform under surge conditions?
The 1N5354/TR12 is rated for 5.8 A peak non-recurrent surge current (IZSM) in an 8.3 ms half-sine waveform, per Microsemi's datasheet. This capability allows it to absorb transient energy in overvoltage events without degradation, provided the surge interval is non-repetitive and duty cycle remains low. Its 25 °C/W junction-to-lead thermal resistance helps dissipate surge heat rapidly through leads, making the 1N5354/TR12 suitable for protecting 24 V industrial rails against lightning-induced spikes or inductive kickback.
1N5354/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):
- 17 V
- Tolerance:
- ±20%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 2.5 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 12.2 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
1N5354/TR12 FAQ
1.How can I place an order for 1N5354/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5354/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 1N5354/TR12 reliable?
The price and inventory of 1N5354/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5354/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5354/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5354/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5354/TR12?
1N5354/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5354/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 1N5354/TR12?
For technical support, including 1N5354/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5354/TR12 requirements.
6.How does Aetrix verify that 1N5354/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5354/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 1N5354/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5354/TR12?
All 1N5354/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5354/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 1N5354/TR12 part is unused and in its original packaging.
Return procedure for 1N5354/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5354/TR12 Tags
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