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Microchip Technology 1N5354B/TR12
- Part No.:
- 1N5354B/TR12
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5354B/TR12.pdf
- Description:
- DIODE ZENER 17V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,623
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Product details
Overview
1N5354B/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 V maximum voltage regulation (ΔVZ) - used for precision voltage reference and overvoltage protection in power supply feedback loops.
For engineers reviewing the 1N5354B/TR12 datasheet, 1N5354B/TR12 pinout, 1N5354B/TR12 application, or 1N5354B/TR12 equivalent, key selection criteria include Zener voltage stability under varying load/temperature, surge current capability (IZSM = 5.8 A), thermal resistance (25 °C/W junction-to-lead), and RoHS-compliant matte-tin plating per MIL-STD-750.
Technical Context
This device operates as a two-terminal voltage regulator in reverse-biased mode, with cathode indicated by band and rated for continuous DC operation up to 17 V at 70 mA IZT. Its low dynamic impedance (2.5 Ω) ensures minimal voltage deviation across 10–50% of IZM (5.8 A), and its 25 °C/W thermal resistance enables stable 5 W dissipation when lead temperature is maintained ≤25 °C.
The 1N5354B/TR12 meets JEDEC registration standards, features moisture sensitivity Level 1 (no dry pack required), and supports surge immunity per 8.3 ms half-sine waveform (IZSM = 5.8 A). It is not intended for high-frequency signal clamping due to typical capacitance >100 pF at VR = 4 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17 V nominal, ±5% tolerance - defines regulated output voltage in shunt regulator circuits. |
| Test Current (IZT) | 70 mA - operating point where VZ and ZZ are specified; sets minimum bias current for stable regulation. |
| Dynamic Impedance (ZZ) | 2.5 Ω max - low series resistance ensures <0.175 V change per 70 mA load variation near IZT. |
| Max Regulator Current (IZM) | 5.8 A - maximum steady-state reverse current at TL = 25 °C with adequate heat sinking. |
| Voltage Regulation (ΔVZ) | 5.8 V max - difference between VZ measured at 10% and 50% of IZM, indicating regulation linearity. |
| Surge Current (IZSM) | 5.8 A peak - non-repetitive 8.3 ms half-sine rating for transient overvoltage suppression. |
| Thermal Resistance | 25 °C/W junction-to-lead (3/8″ lead length) - determines heatsink requirement for 5 W continuous operation. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode identified by color band; leads plated with RoHS-compliant matte tin per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to circuit ground or lower-potential rail; carries forward current up to 1.0 A (VF ≤ 1.2 V). |
| Cathode | Zener regulation terminal / Voltage reference node | Banded end; connected to unregulated input; maintains 17 V across load when reverse-biased above knee voltage. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized electrical behavior and interchangeability across qualified suppliers. |
| ±5% voltage tolerance (B suffix) | Enables tighter regulation than ±10% (A) or ±20% (no suffix) variants in feedback-critical applications. |
| Moisture Sensitivity Level 1 | Eliminates dry-pack requirement and bake-out prior to PCB assembly, reducing manufacturing cost. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Permits handling without special ESD controls during manual assembly or rework. |
| RoHS compliant (e3 suffix) | Meets EU Directive 2011/65/EU with lead-free matte-tin plating and halogen-free epoxy body. |
Applications
| Switch-Mode Power Supply Feedback | Overvoltage Protection Clamp |
|---|---|
Use Scenario: Stabilizing error amplifier reference in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener reference diode providing precise 17 V threshold for TL431 or optocoupler bias network. Use Value: Maintains ±0.85 V regulation window (ΔVZ = 5.8 V) across 0.58–2.9 A load current range, ensuring consistent cross-regulation. |
Use Scenario: Clamping transient spikes on 15 V DC bus in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Shunt protector diverting surge energy exceeding 17 V to ground before downstream IC damage. Use Value: Withstands 5.8 A non-repetitive surges (8.3 ms) while limiting clamped voltage to ≤22.8 V (VZM), protecting 20 V-rated components. |
| Programmable Voltage Reference | DC-DC Converter Trim Circuit |
Use Scenario: Generating stable 17 V reference for analog sensor excitation in automotive engine control units. IC Role / Device Role / Timing Role: Precision shunt reference establishing fixed bias point for ratiometric sensor scaling. Use Value: Delivers <±0.85 V drift over -65 °C to +150 °C operating range, enabling accurate cold-start calibration. |
Use Scenario: Fine-tuning output voltage of adjustable buck regulator via feedback divider offset. IC Role / Device Role / Timing Role: Series-connected Zener injecting controlled offset into FB node of LM2678-type controller. Use Value: Enables ±1.7 V adjustment range with 2.5 Ω ZZ minimizing interaction with divider impedance, preserving loop stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5354B (bulk) | Identical electrical specs; differs only in packaging - no tape-and-reel (TR12) carrier. | No automated pick-and-place support; suitable for hand-soldered prototypes or low-volume repair. | Select 1N5354B/TR12 for SMT production lines requiring EIA-296 compliant reel feeding. |
| MMSZ5246B-TP (Micro Commercial) | Surface-mount SOD-123 package; same 17 V/±5%/5 W rating but higher ZZ (7 Ω) and lower IZM (1.2 A). | Limited to low-power, space-constrained designs; unsuitable for high-current regulation or surge clamping. | Choose MMSZ5246B-TP only when board area is critical and peak current remains <1.2 A. |
Compared with 1N5354B/TR12, the bulk 1N5354B offers identical performance without reel logistics, while MMSZ5246B-TP trades axial-mount robustness and 5.8 A surge capability for compactness - making 1N5354B/TR12 optimal for industrial power rails needing mechanical durability and high-energy transient suppression.
Availability
1N5354B/TR12 is available at Aetrix Electronics and suitable for switch-mode power supplies, overvoltage protection circuits, programmable voltage references, and DC-DC converter trim networks requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for 1N5354B/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 1N5354B/TR12 belongs to Microsemi's legacy 1N53xxB axial Zener family, engineered for ruggedized voltage regulation in harsh-environment power systems where thermal stability, surge resilience, and long-term parametric consistency are critical.
FAQ
What is the Zener voltage tolerance of the 1N5354B/TR12?
The 1N5354B/TR12 has a nominal Zener voltage of 17 V with ±5% tolerance, as indicated by the "B" suffix per Microsemi's datasheet. This means the actual VZ falls between 16.15 V and 17.85 V at 70 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range of -65 °C to +150 °C.
Can the 1N5354B/TR12 be used in surface-mount designs?
No - the 1N5354B/TR12 is an axial-leaded T-18 package device intended for through-hole mounting. For surface-mount equivalents, Microsemi offers the SMBJ5354B or SMBG5354B in DO-214AA/DO-214AB packages. These share the same 17 V/±5%/5 W rating but differ in thermal performance and surge capability.
What is the maximum power dissipation of the 1N5354B/TR12 at 25°C?
The 1N5354B/TR12 is rated for 5.0 watts maximum power dissipation at 25 °C lead temperature (TL), with linear derating to zero at 150 °C. When mounted on FR4 PCB with 1 oz copper, its steady-state power drops to 1.47 W at 25 °C ambient due to higher junction-to-ambient thermal resistance (85 °C/W).
Does the 1N5354B/TR12 meet RoHS requirements?
Yes - the "e3" designation in the full part number (1N5354B/TR12 e3) confirms RoHS compliance per EU Directive 2011/65/EU. This includes lead-free matte-tin plating on leads and halogen-free UL94V-0 epoxy encapsulation, verified per Microsemi's REV D datasheet dated August 2008.
How is polarity marked on the 1N5354B/TR12?
The 1N5354B/TR12 uses a cathode band marking: the banded end is the cathode and must be held at a higher potential than the anode to operate in Zener breakdown. Forward voltage is ≤1.2 V at 1.0 A, confirming standard silicon diode behavior in forward conduction mode.
1N5354B/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:
- ±5%
- 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
1N5354B/TR12 FAQ
1.How can I place an order for 1N5354B/TR12 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5354B/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 1N5354B/TR12 reliable?
The price and inventory of 1N5354B/TR12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5354B/TR12 is usually 5 days.
3.What payment methods are accepted for 1N5354B/TR12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5354B/TR12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5354B/TR12?
1N5354B/TR12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5354B/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 1N5354B/TR12?
For technical support, including 1N5354B/TR12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5354B/TR12 requirements.
6.How does Aetrix verify that 1N5354B/TR12 is sourced from the original manufacturer or authorized distributors?
All 1N5354B/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 1N5354B/TR12 meets industry standards.
7.What is the process for return or replacement of 1N5354B/TR12?
All 1N5354B/TR12 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5354B/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 1N5354B/TR12 part is unused and in its original packaging.
Return procedure for 1N5354B/TR12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5354B/TR12 Tags
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MM5Z5V1ST1G
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