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Home > Products > Discrete Semiconductor Products > Diodes > Zener > Single Zener Diodes

Microchip Technology SMBG5385A/TR13

Name: SMBG5385A/TR13
Brand: Microchip Technology
SKU: SMBG5385A/TR13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SMBG5385A/TR13

Manufacturer:: Microchip Technology

Category:: Single Zener Diodes

Package:: DO-215AA, SMB Gull Wing

Datasheet:: SMBG5385A/TR13.pdf

Description:: DIODE ZENER 170V 5W DO214AA

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Product details

Overview

SMBG5385A/TR13 from Microsemi is a surface-mount 5 W Zener diode with nominal Zener voltage of 170 V, ±10% tolerance (A-suffix), rated test current of 8.0 mA, maximum dynamic impedance of 380 Ω at IZT, and maximum regulator current of 28 mA - used for precision voltage regulation in power supply feedback loops and overvoltage protection circuits.

For engineers reviewing the SMBG5385A/TR13 datasheet, SMBG5385A/TR13 pinout, SMBG5385A/TR13 application, or SMBG5385A/TR13 equivalent, key selection criteria include Zener voltage accuracy, surge current capability (1750 A @ 8.3 ms), thermal resistance (R_θJA = 90 °C/W on FR4), and RoHS-compliant matte-tin gull-wing termination per DO-215AA package.

Technical Context

This device operates as a reverse-biased silicon Zener diode delivering stable reference voltage across wide temperature (-65 to +150 °C) and current ranges. Its breakdown behavior is characterized by low dynamic impedance (380 Ω at 8.0 mA) and minimal voltage drift versus current near the knee region (IZK = 1.0 mA, ZZK = 31.6 Ω).

The SMBG5385A/TR13 is designed for high-surge environments with non-repetitive peak surge current rating of 1750 A (8.3 ms half-sine), and features moisture sensitivity level 1 per J-STD-020B - eliminating dry-pack requirements. It uses void-free UL94V-0 epoxy encapsulation and annealed matte-tin plating compliant with MIL-STD-750 method 2026.

Key Specifications

Parameter	Value and Actual Design Meaning
Zener Voltage (V_Z)	170 V ±10% at I_ZT = 8.0 mA - defines regulated output voltage under nominal bias conditions.
Power Dissipation (P_D)	5.0 W at T_L < 25 °C - sets maximum continuous thermal load with adequate lead heat sinking.
Dynamic Impedance (Z_ZT)	380 Ω max at I_ZT = 8.0 mA - indicates voltage stability under small-signal AC modulation.
Max Regulator Current (I_ZM)	28 mA - derived from P_D/V_ZM = 5.0 W / 187 V, limiting safe DC operating current.
Surge Current (I_ZSM)	1750 A (8.3 ms half-sine) - supports transient overvoltage clamping without failure.
Thermal Resistance (R_θJA)	90 °C/W on FR4 (1 oz Cu, recommended footprint) - determines junction temperature rise under load.
Reverse Leakage (I_R)	0.5 µA max at V_R = 137 V - ensures minimal standby power loss in high-impedance bias networks.

Pinout & Package

DO-215AA gull-wing surface-mount package with cathode band marking; terminals are anode and cathode - no internal circuitry or multi-pin functionality.

Pin/Terminal	Circuit Role	Design Meaning
Cathode (banded end)	Positive terminal under reverse bias	Connected to regulated output node; polarity must be observed to avoid forward conduction.
Anode	Reference/ground terminal	Typically tied to system ground or feedback reference point; completes reverse-bias path.

Key Features

Feature	Design Value
JEDEC 1N53xxB equivalent	Identical electrical specs and test methods to legacy through-hole 1N5385B - enables drop-in replacement in legacy designs.
Gull-wing lead form	Visible solder joints per DO-215AA - supports automated optical inspection (AOI) and rework accessibility.
Moisture Sensitivity Level 1	No dry pack required - reduces handling cost and eliminates bake-out prior to reflow.
RoHS-compliant matte-tin plating	Lead-free termination meeting IPC-J-STD-020B - suitable for Pb-free assembly processes.
High surge withstand	1750 A non-repetitive surge rating - protects downstream circuitry from lightning-induced transients or inductive kickback.

Applications

Switch-Mode Power Supply Feedback	Overvoltage Protection Clamp
Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error amplifier. IC Role / Device Role / Timing Role: Precision voltage reference providing stable 170 V threshold for error signal generation. Use Value: Maintains ±10% output regulation across line/load/temperature with low ZZT ensuring minimal feedback noise coupling.	Use Scenario: Clamps transient voltage spikes on DC bus lines in motor drives or industrial PLC I/O modules. IC Role / Device Role / Timing Role: High-energy surge suppression element absorbing 8.3 ms half-sine surges up to 1750 A. Use Value: Prevents MOSFET gate oxide rupture or controller IC damage without requiring active crowbar circuitry.
Programmable Reference Source	High-Voltage Bias Network Stabilizer
Use Scenario: Sets adjustable threshold in high-voltage comparator circuits for battery management or arc detection systems. IC Role / Device Role / Timing Role: Stable 170 V reference node enabling accurate trip-point setting independent of supply variation. Use Value: Delivers <0.5 µA leakage at 137 V reverse bias - minimizes current draw in ultra-low-power sensing paths.	Use Scenario: Stabilizes bias voltage for vacuum tube heater supplies or photomultiplier high-voltage dividers. IC Role / Device Role / Timing Role: Low-drift Zener shunt regulating node in high-resistance divider chains. Use Value: Achieves minimal voltage vs. current variation (low ZZT) and stable 170 V reference across -65 to +150 °C.

Switch-Mode Power Supply Feedback

Overvoltage Protection Clamp

Use Scenario: Regulates output voltage in isolated flyback or forward converter feedback loop using optocoupler-coupled error amplifier.

IC Role / Device Role / Timing Role: Precision voltage reference providing stable 170 V threshold for error signal generation.

Use Value: Maintains ±10% output regulation across line/load/temperature with low ZZT ensuring minimal feedback noise coupling.

Use Scenario: Clamps transient voltage spikes on DC bus lines in motor drives or industrial PLC I/O modules.

IC Role / Device Role / Timing Role: High-energy surge suppression element absorbing 8.3 ms half-sine surges up to 1750 A.

Use Value: Prevents MOSFET gate oxide rupture or controller IC damage without requiring active crowbar circuitry.

Programmable Reference Source

High-Voltage Bias Network Stabilizer

Use Scenario: Sets adjustable threshold in high-voltage comparator circuits for battery management or arc detection systems.

IC Role / Device Role / Timing Role: Stable 170 V reference node enabling accurate trip-point setting independent of supply variation.

Use Value: Delivers <0.5 µA leakage at 137 V reverse bias - minimizes current draw in ultra-low-power sensing paths.

Use Scenario: Stabilizes bias voltage for vacuum tube heater supplies or photomultiplier high-voltage dividers.

IC Role / Device Role / Timing Role: Low-drift Zener shunt regulating node in high-resistance divider chains.

Use Value: Achieves minimal voltage vs. current variation (low ZZT) and stable 170 V reference across -65 to +150 °C.

Equivalent & Alternatives

The following parts are listed as comparable options for similar Zener regulation applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
1N5385B	Through-hole axial T-18 package; identical V_Z, I_ZT, ZZT, and I_ZM; same ±10% tolerance and 5 W rating.	Requires PCB through-hole mounting and wave soldering; not suitable for high-density SMT layouts.	Select when legacy board repair or mixed-technology assembly mandates axial-leaded components.
SMBJ5385A	J-bend DO-214AA package; identical electrical specs but different thermal resistance (R_θJA = 100 °C/W vs. 90 °C/W) and pad layout.	Lower profile than SMBG but less visible solder joint; slightly reduced thermal performance on FR4.	Choose when existing DO-214AA footprint exists or J-bend form factor better suits mechanical constraints.

Compared with SMBG5385A/TR13, the 1N5385B offers identical regulation performance but requires through-hole assembly, while SMBJ5385A provides SMT compatibility with marginally higher thermal resistance - both serve as functionally aligned alternatives where package geometry or process compatibility dictates selection.

Availability

SMBG5385A/TR13 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, overvoltage protection clamp, and high-voltage bias network stabilizer applications requiring stable component supply and long-term obsolescence mitigation.

Supply support for SMBG5385A/TR13 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 Corporation (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability analog, RF, and discrete power solutions for aerospace, defense, and industrial markets.

The SMBG53xxA/B series was developed to deliver JEDEC-identical 5 W Zener performance in a gull-wing surface-mount package optimized for automated assembly, thermal reliability, and moisture-insensitive handling.

FAQ

What is the Zener voltage tolerance of SMBG5385A/TR13?

The SMBG5385A/TR13 has a Zener voltage tolerance of ±10%, indicated by the "A" suffix in the part number. Its nominal Zener voltage is 170 V, meaning the actual measured V_Z falls between 153 V and 187 V at I_ZT = 8.0 mA and T_L = 25 °C. This tolerance is verified per Microsemi's T4-LDS-0246-1 specification sheet.

Does SMBG5385A/TR13 require dry packing before reflow soldering?

No, SMBG5385A/TR13 does not require dry packing. It carries Moisture Sensitivity Level 1 (MSL-1) per IPC/JEDEC J-STD-020B, meaning it can be stored indefinitely at ambient conditions without baking. The void-free UL94V-0 epoxy body and matte-tin plating ensure robustness during standard lead-free reflow profiles up to 260 °C for 10 seconds.

What is the maximum surge current rating for SMBG5385A/TR13?

The SMBG5385A/TR13 is rated for a non-repetitive peak surge current (I_ZSM) of 1750 A, defined as an 8.3 ms half-sine waveform. This value is specified in the Electrical Characteristics table on page 3 of Microsemi's T4-LDS-0246-1 datasheet and reflects its capability to absorb high-energy transients without parametric shift or catastrophic failure.

How does the thermal resistance of SMBG5385A/TR13 compare between junction-to-lead and junction-to-ambient?

SMBG5385A/TR13 has R_θJL = 25 °C/W and R_θJA = 90 °C/W (on FR4 with 1 oz Cu and recommended footprint). The lower R_θJL confirms efficient heat transfer to the PCB leads, while the higher R_θJA reflects ambient convection limits - underscoring the importance of proper copper pour and thermal vias for sustained 5 W operation.

Is SMBG5385A/TR13 RoHS compliant?

Yes, SMBG5385A/TR13 is RoHS compliant, as confirmed by the "e3" marking option and explicit statement in the Features section of T4-LDS-0246-1. It uses annealed matte-tin plating per MIL-STD-750 method 2026 and meets EU Directive 2011/65/EU requirements for lead-free termination.

SMBG5385A/TR13 Specifications

Product attributes: Attribute value

Manufacturer:: Microchip Technology

Series:: -

Package/Case:: DO-215AA, SMB Gull Wing

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Voltage - Zener (Nom) (Vz):: 170 V

Tolerance:: ±10%

Power - Max:: 5 W

Impedance (Max) (Zzt):: 380 Ohms

Current - Reverse Leakage @ Vr:: 500 nA @ 122 V

Voltage - Forward (Vf) (Max) @ If:: 1.2 V @ 1 A

Operating Temperature:: -65°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DO-214AA (SMBG)

SMBG5385A/TR13 FAQ

1.How can I place an order for SMBG5385A/TR13 through Aetrix?

Please submit a Request for Quotation (RFQ) for SMBG5385A/TR13 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 SMBG5385A/TR13 reliable?

The price and inventory of SMBG5385A/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMBG5385A/TR13 is usually 5 days.

3.What payment methods are accepted for SMBG5385A/TR13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBG5385A/TR13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SMBG5385A/TR13?

SMBG5385A/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SMBG5385A/TR13 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 SMBG5385A/TR13?

For technical support, including SMBG5385A/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBG5385A/TR13 requirements.

6.How does Aetrix verify that SMBG5385A/TR13 is sourced from the original manufacturer or authorized distributors?

All SMBG5385A/TR13 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 SMBG5385A/TR13 meets industry standards.

7.What is the process for return or replacement of SMBG5385A/TR13?

All SMBG5385A/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMBG5385A/TR13, 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 SMBG5385A/TR13 part is unused and in its original packaging.

Return procedure for SMBG5385A/TR13:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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