My Inquiry
My Account
Microchip Technology 1N5373A/TR8
- Part No.:
- 1N5373A/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5373A/TR8.pdf
- Description:
- DIODE ZENER 68V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5373A/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 68 V, ±10% tolerance (A suffix), 20 mA test current, 44 Ω dynamic impedance at IZT, and maximum reverse current of 0.5 μA at 51.7 V. It operates from –65 °C to +150 °C and is used for precision voltage reference and overvoltage protection in industrial power supplies.
For engineers reviewing the 1N5373A/TR8 datasheet, 1N5373A/TR8 pinout, 1N5373A/TR8 application, or 1N5373A/TR8 equivalent, key selection criteria include Zener voltage tolerance, thermal resistance (25 °C/W junction-to-lead), surge current rating (500 A), voltage regulation (ΔVZ = 2.0 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 cathode-band polarity must be observed. Its low dynamic impedance (44 Ω) ensures stable regulation across its specified operating current range (1–500 mA), and its 25 °C/W thermal resistance enables high steady-state power dissipation (5 W) when leads are mounted at 3/8″ (10 mm) from body.
The 1N5373A/TR8 complies with JEDEC 1N53xxB series specifications, uses void-free UL94V-0 epoxy encapsulation, and meets IPC/JEDEC J-STD-020B Level 1 moisture sensitivity-no dry pack required. It is rated for 260 °C soldering (10 s max) and exhibits minimal voltage drift versus temperature due to its defined ΔVZ (2.0 V) and tight thermal design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V ±10% - defines regulated output voltage under nominal test conditions |
| Test Current (IZT) | 20 mA - current at which VZ is measured; establishes baseline operating point |
| Dynamic Impedance (ZZ) | 44 Ω at IZT - determines voltage stability against load current variation |
| Max Reverse Current (IR) | 0.5 μA at 51.7 V - specifies leakage level below regulation knee; critical for low-power standby |
| Power Dissipation (PD) | 5.0 W at TL = 25 °C - maximum continuous DC power with adequate heat sinking |
| Thermal Resistance (RθJL) | 25 °C/W junction-to-lead - enables thermal design using lead length as heatsink path |
| Voltage Regulation (ΔVZ) | 2.0 V - difference between VZ at 10% and 50% of IZM; quantifies regulation linearity |
Pinout & Package
Package: Axial-leaded T-18 plastic case (void-free UL94V-0 epoxy), cathode indicated by band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.7 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail during Zener operation |
| Cathode (banded end) | Reverse-bias regulation terminal / high-voltage reference node | Connected to unregulated input; maintains stable 68 V drop when reverse-biased above knee |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener family | Ensures standardized electrical behavior and interchangeability across qualified suppliers |
| ±10% voltage tolerance (A suffix) | Supports cost-sensitive applications where tighter regulation is not required |
| Level 1 moisture sensitivity | Eliminates dry-pack requirement and bake-out prior to assembly |
| 500 A surge current rating (8.3 ms half-sine) | Withstands transient overvoltage events without degradation in industrial environments |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Reduces handling precautions and eliminates need for special ESD controls in production |
Applications
| Industrial Power Supply Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Provides stable 68 V reference for feedback loop in 72 VDC industrial SMPS. IC Role / Device Role / Timing Role: Two-terminal passive voltage reference establishing error amplifier setpoint. Use Value: Maintains ±10% output regulation across line/load transients and 100 °C ambient, leveraging 44 Ω ZZ and 2.0 V ΔVZ. | Use Scenario: Clamps induced surges on 48 V telecom distribution bus during lightning strike testing. IC Role / Device Role / Timing Role: Standby shunt protector activated only above 68 V threshold. Use Value: Absorbs 500 A peak surge (8.3 ms) without failure, validated per IEC 61000-4-5 Level 4. |
| Programmable Logic Controller Input Conditioning | DC Motor Field Winding Voltage Stabilization |
Use Scenario: Conditions 60–80 V field supply to PLC analog input module with ±10% tolerance. IC Role / Device Role / Timing Role: Passive voltage limiter preventing ADC overrange during brownout recovery. Use Value: Blocks >68 V excursions while drawing <0.5 μA leakage at 51.7 V, preserving signal integrity. | Use Scenario: Stabilizes excitation voltage for 65 V nominal DC motor field winding. IC Role / Device Role / Timing Role: Shunt regulator maintaining constant field current despite battery voltage sag. Use Value: Delivers 5 W continuous dissipation at 25 °C lead temperature, enabled by 25 °C/W RθJL. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5373B/TR8 | ±5% VZ tolerance (vs. ±10%); identical VZ, IZT, ZZ, and package | Higher precision needed in feedback loops where 3.4 V total tolerance margin is insufficient | Select 1N5373B/TR8 when regulation accuracy outweighs cost sensitivity |
| MMBZ5268B-TP | Surface-mount SOD-123 package; 68 V ±5%, 20 mA IZT, 50 Ω ZZ; 0.5 W rating | Used in space-constrained PCBs where axial leads are incompatible with automated placement | Choose MMBZ5268B-TP only for low-power (<0.5 W), high-density layouts; not a thermal or surge-capable replacement |
Compared with 1N5373A/TR8, the 1N5373B/TR8 offers tighter voltage control without changing layout or thermal design, while the MMBZ5268B-TP trades 10× lower power rating and no surge capability for board-space savings-neither is pin-compatible, and both require revalidation of thermal and transient performance.
Availability
1N5373A/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, PLC input conditioning, and DC motor field stabilization requiring stable component supply and long-term obsolescence management.
Supply support for 1N5373A/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, mixed-signal, and RF solutions for aerospace, defense, and industrial markets.
The 1N53xxA/B series was designed for ruggedized voltage regulation in harsh-environment power systems, emphasizing surge resilience, wide temperature operation, and JEDEC-standardized interchangeability.
FAQ
What is the Zener voltage tolerance of the 1N5373A/TR8?
The 1N5373A/TR8 has a Zener voltage tolerance of ±10%, as indicated by the "A" suffix in its part number. This means its actual regulation voltage falls between 61.2 V and 74.8 V at 20 mA test current and 25 °C lead temperature. This tolerance is confirmed in Microsemi's official 1N5333B–1N5388B datasheet revision D (2008), Note 1.
Can the 1N5373A/TR8 be used in surface-mount designs?
No, the 1N5373A/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. For SMT equivalents, Microsemi offers the SMBJ5373A series; however, those parts differ in thermal performance, surge rating, and footprint. The 1N5373A/TR8 requires through-hole mounting with 3/8″ (10 mm) lead length for full 5 W rating.
What is the maximum surge current rating for the 1N5373A/TR8?
The 1N5373A/TR8 is rated for a maximum non-recurrent surge current (IZSM) of 500 A, defined as the peak value of an 8.3 ms half-sine waveform. This rating assumes proper PCB layout and thermal anchoring; it is verified per Microsemi's published electrical characteristics table and supports IEC 61000-4-5 compliance testing.
Does the 1N5373A/TR8 require dry packing before reflow soldering?
No, the 1N5373A/TR8 has IPC/JEDEC J-STD-020B moisture sensitivity level 1, meaning it may be stored and processed indefinitely at ≤30 °C/60% RH without dry packing or baking. Its void-free epoxy encapsulation eliminates moisture ingress risk, simplifying manufacturing logistics compared to higher-MSL discrete components.
How does the thermal resistance of the 1N5373A/TR8 affect its power handling?
The 1N5373A/TR8 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W when leads are trimmed to 3/8″ (10 mm) from the body. This allows full 5 W dissipation at TL = 25 °C. At longer lead lengths or higher ambient temperatures, derating per Figure 1 in the datasheet is mandatory to avoid exceeding TJ = 150 °C.
1N5373A/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):
- 68 V
- Tolerance:
- ±10%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 44 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 49 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
1N5373A/TR8 FAQ
1.How can I place an order for 1N5373A/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5373A/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 1N5373A/TR8 reliable?
The price and inventory of 1N5373A/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5373A/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5373A/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5373A/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5373A/TR8?
1N5373A/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5373A/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 1N5373A/TR8?
For technical support, including 1N5373A/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5373A/TR8 requirements.
6.How does Aetrix verify that 1N5373A/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5373A/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 1N5373A/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5373A/TR8?
All 1N5373A/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5373A/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 1N5373A/TR8 part is unused and in its original packaging.
Return procedure for 1N5373A/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5373A/TR8 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…
