My Inquiry
My Account
Microchip Technology 1N5948BUR-1/TR
- Part No.:
- 1N5948BUR-1/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-213AB, MELF (Glass)
- Datasheet:
-
1N5948BUR-1/TR.pdf
- Description:
- DIODE ZENER 91V 1.25W DO213AB
- Quantity:
- Payment:
- Shipping:
Inventory:7,149
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5948BUR-1/TR from Microsemi is a 1.5 W surface-mount Zener diode in DO-213AB (MELF) glass package, rated for 91 V ±5% Zener voltage at 4.1 mA test current, with 200 Ω dynamic impedance and 16 mA maximum Zener current. It delivers stable voltage regulation in high-density power supply feedback loops and precision reference circuits across industrial temperature range.
For engineers reviewing the 1N5948BUR-1/TR datasheet, 1N5948BUR-1/TR pinout, 1N5948BUR-1/TR application, or 1N5948BUR-1/TR equivalent, key selection criteria include its hermetically sealed MELF construction, MIL-PRF-19500 screening capability, low thermal resistance (40 °C/W junction-to-end cap), RoHS-compliant matte tin plating, and specified capacitance performance per Figure 2.
Technical Context
This device operates as a two-terminal voltage reference in reverse-biased breakdown mode, with Zener voltage defined at IZT = 4.1 mA and measured at TEC = 30 °C. Its metallurgically bonded tungsten slug structure ensures low thermal resistance and enhanced reliability under thermal cycling.
The 1N5948BUR-1/TR exhibits 0.25 µA reverse leakage at VR = 73 V and maintains regulation over 16 mA maximum DC Zener current. Its 1.5 W steady-state power rating applies at end-cap temperature ≤115 °C, derating linearly to zero at 175 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 91 V ±5% at IZT = 4.1 mA - defines precise regulation point for feedback networks |
| Dynamic Impedance (ZZT) | 200 Ω - limits output voltage variation under load current changes |
| Max Zener Current (IZM) | 16 mA - sets upper limit for continuous regulation without exceeding 1.5 W dissipation |
| Junction-to-End Cap Rθ | 40 °C/W - enables efficient heat transfer to PCB pad or heatsink via end cap contact |
| Reverse Leakage (IR) | 0.25 µA at VR = 73 V - ensures minimal error current in high-impedance reference paths |
| Forward Voltage (VF) | 1.2 V max at IF = 200 mA - supports use as clamp or protection diode in forward bias |
| Operating Temperature | –65 °C to +175 °C - supports extended-range industrial and aerospace applications |
Pinout & Package
DO-213AB (MELF) hermetically sealed glass package with metallurgically bonded tungsten slugs; cathode indicated by single band; no discrete pins - terminals are axial end caps soldered to PCB pads per recommended footprint (A = 7.00 mm, B = 1.8 mm, C = 2.8 mm).
Key Features
| Feature | Design Value |
|---|---|
| Hermetic glass MELF construction | Eliminates moisture ingress and long-term parameter drift in harsh environments |
| Metallurgically enhanced internal contacts | Reduces thermal resistance by 30% vs standard glass diodes, improving power handling stability |
| MIL-PRF-19500 screening option | Enables qualification for military/aerospace programs requiring lot traceability and burn-in |
| Non-ESD-sensitive design | Withstands >4 kV HBM without degradation per MIL-STD-750 Method 1020 |
| RoHS-compliant matte tin plating | Ensures reliable solder wetting and compatibility with lead-free reflow profiles |
Applications
| Switching Power Supply Feedback | Industrial Sensor Reference |
|---|---|
Use Scenario: Regulates output voltage in isolated flyback converters using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Primary-side Zener reference establishing precise 91 V threshold for TL431-like comparator action. Use Value: Maintains ±1% output accuracy over –40 °C to +125 °C ambient due to low tempco and hermetic stability. |
Use Scenario: Provides stable excitation voltage for RTD or strain gauge bridge circuits in process control transmitters. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference sourcing <1 µA bias current into high-impedance sensor interface. Use Value: 0.25 µA reverse leakage at 73 V minimizes measurement offset error in 24-bit ADC front ends. |
| Aerospace Power Conditioning | High-Reliability Test Equipment |
Use Scenario: Voltage clamp in avionics DC-DC converter input stage subjected to lightning-induced transients. IC Role / Device Role / Timing Role: Transient suppressor absorbing energy during 100 V surge events while maintaining regulation integrity. Use Value: Hermetic seal and MIL-PRF-19500 screening ensure zero parametric shift after 1000 thermal cycles (–55 °C/+125 °C). |
Use Scenario: Calibration reference in bench multimeters requiring long-term voltage stability and low hysteresis. IC Role / Device Role / Timing Role: Precision shunt reference operating at fixed 4.1 mA current for repeatable 91.0 V output. Use Value: 5% tolerance and 200 Ω ZZT enable sub-0.1% absolute accuracy when combined with 4-wire Kelvin sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5948BRLG | Same 91 V/5% spec, but in DO-41 axial package with leaded termination | Requires through-hole mounting; higher parasitic inductance limits >1 MHz switching noise suppression | Select when legacy board layout or manual assembly mandates axial leads |
| SMBG5948B | Same 91 V/5% spec, but in SMB package with tabbed SMT footprint and 1.0 W rating | Lower power handling (1.0 W vs 1.5 W); higher thermal resistance (120 °C/W vs 40 °C/W) | Select when space-constrained layouts require smaller footprint and 1 W suffices |
Compared with 1N5948BRLG and SMBG5948B, the 1N5948BUR-1/TR offers superior thermal performance and hermetic reliability in surface-mount high-power regulation, making it optimal for aerospace-grade and high-density power designs where end-cap cooling and long-term parameter stability are critical.
Availability
1N5948BUR-1/TR is available at Aetrix Electronics and suitable for industrial power supplies, aerospace conditioning modules, precision instrumentation references, and high-reliability sensor interfaces requiring stable component supply and full traceability.
Supply support for 1N5948BUR-1/TR 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 and mixed-signal components for defense, aerospace, and industrial markets.
The 1N5948BUR-1/TR belongs to Microsemi's metallurgically bonded MELF Zener series, engineered for applications demanding hermetic sealing, radiation hardness, and MIL-PRF-19500 compliance in mission-critical systems.
FAQ
What is the Zener voltage tolerance and test condition for 1N5948BUR-1/TR?
The 1N5948BUR-1/TR has a Zener voltage tolerance of ±5% at IZT = 4.1 mA, measured at end-cap temperature TEC = 30 °C. Voltage is recorded 90 seconds after applying DC current, per Microsemi T4-LDS-0300-1 specification. This tolerance ensures predictable regulation in feedback networks where tight voltage setpoints are required.
Does 1N5948BUR-1/TR support MIL-PRF-19500 screening?
Yes, the 1N5948BUR-1/TR is available with screening per MIL-PRF-19500 when ordered with appropriate reliability level suffixes (e.g., MQ, MX). Screening includes lot traceability, burn-in, and electrical testing per military standards - confirmed in the "Features" section of Microsemi's T4-LDS-0300-1 datasheet.
What is the maximum power dissipation for 1N5948BUR-1/TR at 25 °C ambient?
The 1N5948BUR-1/TR has a steady-state power dissipation of 1.25 W at TA = 25 °C when mounted on FR4 with 1 oz copper and the recommended footprint. Its full 1.5 W rating applies only when end-cap temperature is maintained ≤115 °C - verified in the "Maximum Ratings" table on page 1 of T4-LDS-0300-1.
How does the DO-213AB package of 1N5948BUR-1/TR improve thermal performance?
The DO-213AB (MELF) package of the 1N5948BUR-1/TR achieves 40 °C/W junction-to-end cap thermal resistance via metallurgically bonded tungsten slugs, enabling direct heat conduction to PCB pads. This is 3× better than typical SMB packages (120 °C/W), allowing sustained 1.5 W operation without external heatsinking in compact layouts.
Is 1N5948BUR-1/TR RoHS compliant?
Yes, the 1N5948BUR-1/TR is RoHS compliant, indicated by the "e3" suffix in its full nomenclature (1N5948BUR-1/TR e3). It features matte tin plating over copper terminations and meets exemption 7a for lead in high-melting-temperature solder alloys, as documented in Microsemi's part nomenclature guide on page 2 of T4-LDS-0300-1.
1N5948BUR-1/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-213AB, MELF (Glass)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 91 V
- Tolerance:
- ±5%
- Power - Max:
- 1.25 W
- Impedance (Max) (Zzt):
- 200 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 69.2 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-213AB (MELF, LL41)
1N5948BUR-1/TR FAQ
1.How can I place an order for 1N5948BUR-1/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5948BUR-1/TR 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 1N5948BUR-1/TR reliable?
The price and inventory of 1N5948BUR-1/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5948BUR-1/TR is usually 5 days.
3.What payment methods are accepted for 1N5948BUR-1/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5948BUR-1/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5948BUR-1/TR?
1N5948BUR-1/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5948BUR-1/TR 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 1N5948BUR-1/TR?
For technical support, including 1N5948BUR-1/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5948BUR-1/TR requirements.
6.How does Aetrix verify that 1N5948BUR-1/TR is sourced from the original manufacturer or authorized distributors?
All 1N5948BUR-1/TR 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 1N5948BUR-1/TR meets industry standards.
7.What is the process for return or replacement of 1N5948BUR-1/TR?
All 1N5948BUR-1/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5948BUR-1/TR, 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 1N5948BUR-1/TR part is unused and in its original packaging.
Return procedure for 1N5948BUR-1/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5948BUR-1/TR 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…
