My Inquiry
My Account
Microchip Technology 1N5371B/TR8
- Part No.:
- 1N5371B/TR8
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- T-18, Axial
- Datasheet:
-
1N5371B/TR8.pdf
- Description:
- DIODE ZENER 60V 5W T18
- Quantity:
- Payment:
- Shipping:
Inventory:6,529
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5371B/TR8 from Microsemi is a 5 W axial-leaded silicon Zener diode with nominal regulation voltage of 60 V, ±5% tolerance (B suffix), 20 mA test current, 40 Ω maximum dynamic impedance at IZT, and 350 A peak surge current rating. 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 1N5371B/TR8 datasheet, 1N5371B/TR8 pinout, 1N5371B/TR8 application, or 1N5371B/TR8 equivalent, key selection criteria include Zener voltage accuracy, thermal resistance (25 °C/W junction-to-lead), surge current capability, reverse leakage (<0.5 μA at 45.5 V), and RoHS-compliant e3 packaging.
Technical Context
This device functions as a two-terminal voltage regulator operating in reverse breakdown mode. Its 60 V nominal Zener voltage is specified at 20 mA test current (IZT) with 40 Ω dynamic impedance (ZZ) and 2.2 V maximum voltage regulation (ΔVZ) between 10% and 50% of IZM.
It delivers 350 A non-repetitive surge current (8.3 ms half-sine) and maintains stable regulation across −65 °C to +150 °C. Thermal resistance is 25 °C/W junction-to-lead (3/8″ lead length) and 85 °C/W junction-to-ambient on FR4 board.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 60 V nominal, ±5% tolerance - defines precise regulation point under 20 mA DC bias. |
| Test Current (IZT) | 20 mA - standardized bias condition for VZ measurement and impedance characterization. |
| Dynamic Impedance (ZZ) | 40 Ω max at IZT - low impedance ensures minimal output voltage variation with load current changes. |
| Max Surge Current (IZSM) | 350 A (8.3 ms half-sine) - enables robust transient overvoltage clamping without failure. |
| Reverse Leakage (IR) | <0.5 μA at 45.5 V - guarantees negligible standby power loss and high off-state blocking integrity. |
| Power Dissipation | 5.0 W at TL = 25 °C (3/8″ lead length) - requires adequate heatsinking above ambient derating curve. |
| Thermal Resistance | 25 °C/W junction-to-lead - supports high continuous current operation when leads act as heat path. |
Pinout & Package
Package: Axial-leaded T-18 plastic case (Void-free UL94V-0 epoxy), cathode indicated by band; RoHS-compliant matte-tin plating per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage side in regulation | Connected to circuit ground or lower potential node during Zener operation. |
| Cathode | Reverse-biased regulation terminal / high-voltage side | Banded end; connected to unregulated input rail to clamp voltage at 60 V. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered 1N-series Zener | Industry-standard footprint and electrical behavior for drop-in compatibility in legacy designs. |
| Moisture Sensitivity Level 1 | No dry pack required - simplifies handling and eliminates bake-out before assembly. |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Robust against electrostatic discharge during handling and PCB assembly. |
| High surge current rating (350 A) | Withstands lightning-induced transients and inductive switching spikes without degradation. |
| Stable voltage regulation over temperature | ΔVZ ≤ 2.2 V across 10–50% of IZM ensures predictable clamping in wide-temperature environments. |
Applications
| Industrial Power Supply Regulation | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Stabilizing feedback reference in 48–72 VDC industrial SMPS outputs. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing precise 60 V setpoint for error amplifier comparison. Use Value: Maintains ±0.3 V output stability over line/load/temperature due to low ZZ and tight 5% tolerance. | Use Scenario: Clamping transient surges on 48 V telecom distribution bus. IC Role / Device Role / Timing Role: Passive crowbar element absorbing energy from 350 A 8.3 ms surges. Use Value: Prevents downstream IC damage by limiting bus voltage to ≤62.4 V (VZ + ΔVZ) during fault events. |
| Programmable Logic Controller Input Protection | Test Equipment Reference Source |
Use Scenario: Protecting 24/48 V digital input channels from field-wiring faults. IC Role / Device Role / Timing Role: Reverse-biased shunt limiter placed across optocoupler input terminals. Use Value: Blocks >62.4 V transients while drawing <0.5 μA leakage at normal operating voltage, preserving signal integrity. | Use Scenario: Providing stable 60 V reference in portable calibrator design. IC Role / Device Role / Timing Role: Primary voltage standard in battery-powered metrology instrument. Use Value: Delivers <2.2 V regulation drift across full current range and −40 °C to +85 °C, enabling ±0.05% calibration accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5371B (bulk) | Identical electrical specs; differs only in packaging (ammo pack vs. tape-and-reel TR8). | No functional difference; TR8 enables automated SMT placement where bulk parts require manual insertion. | Select 1N5371B/TR8 for high-volume PCB assembly; choose bulk for prototyping or low-volume hand-soldered builds. |
| MMSZ5257B-TP (Micro Commercial) | Same 60 V/5% rating but 500 mW SOD-123 package; ZZ = 110 Ω; IZSM = 10 A. | Not suitable for 5 W continuous dissipation or high-energy surge suppression; limited to low-power references. | Use MMSZ5257B-TP only in space-constrained, low-power circuits where thermal mass and surge immunity are secondary. |
Compared with 1N5371B/TR8, the bulk version offers identical performance with manual handling trade-offs, while MMSZ5257B-TP sacrifices power handling and surge robustness for miniaturization-making 1N5371B/TR8 the sole choice for industrial-grade 5 W regulation.
Availability
1N5371B/TR8 is available at Aetrix Electronics and suitable for industrial power supplies, overvoltage protection circuits, and programmable logic controller input stages requiring stable component supply and JEDEC-standard reliability.
Supply support for 1N5371B/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 timing solutions for aerospace, defense, and industrial markets.
The 1N53xxB series was designed specifically for ruggedized 5 W voltage regulation in harsh-environment power systems, emphasizing surge resilience, wide temperature operation, and JEDEC interoperability.
FAQ
What is the Zener voltage tolerance of the 1N5371B/TR8?
The 1N5371B/TR8 has a ±5% Zener voltage tolerance, as indicated by the "B" suffix per Microsemi's documentation. This means its measured VZ falls between 57.0 V and 63.0 V at 20 mA test current and 25 °C lead temperature. The tolerance is guaranteed across the full operating temperature range and does not degrade with surge exposure or long-term operation.
Can the 1N5371B/TR8 be used in surface-mount designs?
No-the 1N5371B/TR8 is an axial-leaded T-18 package and is not compatible with surface-mount assembly. Microsemi offers surface-mount equivalents such as SMBJ5371B for SMC packages, but the 1N5371B/TR8 requires through-hole mounting with 3/8″ lead length for thermal performance. Using it in SMT reflow will exceed solder temperature limits and damage the device.
What is the maximum steady-state power dissipation for the 1N5371B/TR8 on a standard PCB?
When mounted on FR4 with 1 oz copper, 4 mm² pads, and 1 mm × 25 mm traces, the 1N5371B/TR8 is rated for 1.47 W steady-state power at 25 °C ambient. This derates linearly above 25 °C per the 85 °C/W junction-to-ambient thermal resistance. Full 5 W operation requires heatsinking via the leads at TL = 25 °C.
Does the 1N5371B/TR8 meet RoHS requirements?
Yes-the "e3" suffix in the full part number designation (1N5371B/TR8 e3) confirms RoHS compliance per EU Directive 2011/65/EU. The device uses annealed matte-tin plating on leads and halogen-free UL94V-0 epoxy encapsulation, with no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances above threshold limits.
How is polarity marked on the 1N5371B/TR8?
The cathode of the 1N5371B/TR8 is marked by a distinct color band on the body end of the axial package. During Zener operation, the banded (cathode) end must be held at a higher potential than the anode end. Reversing polarity subjects the device to forward conduction only, with VF ≤ 1.2 V at 1.0 A-no regulation occurs in forward bias.
1N5371B/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):
- 60 V
- Tolerance:
- ±5%
- Power - Max:
- 5 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 43 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
1N5371B/TR8 FAQ
1.How can I place an order for 1N5371B/TR8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5371B/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 1N5371B/TR8 reliable?
The price and inventory of 1N5371B/TR8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5371B/TR8 is usually 5 days.
3.What payment methods are accepted for 1N5371B/TR8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5371B/TR8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5371B/TR8?
1N5371B/TR8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5371B/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 1N5371B/TR8?
For technical support, including 1N5371B/TR8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5371B/TR8 requirements.
6.How does Aetrix verify that 1N5371B/TR8 is sourced from the original manufacturer or authorized distributors?
All 1N5371B/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 1N5371B/TR8 meets industry standards.
7.What is the process for return or replacement of 1N5371B/TR8?
All 1N5371B/TR8 units undergo pre-shipment inspection (PSI). If there is an issue with 1N5371B/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 1N5371B/TR8 part is unused and in its original packaging.
Return procedure for 1N5371B/TR8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5371B/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…
