My Inquiry
My Account
Microchip Technology 1N5248B
- Part No.:
- 1N5248B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5248B.pdf
- Description:
- DIODE ZENER 18V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:7,913
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5248B from Microsemi is a 500 mW, 18 V ±5% glass axial-lead Zener diode in DO-35 (DO-204AH) package, designed for precision voltage regulation in low-power analog circuits, reference supplies, and overvoltage protection. It delivers 7.0 Ω zener impedance at 7.0 mA test current, operates from –65°C to +175°C, and features a +0.085 %/°C temperature coefficient.
For engineers reviewing the 1N5248B datasheet, 1N5248B pinout, 1N5248B application, or 1N5248B equivalent, key selection criteria include its 18 V nominal Zener voltage, 5% tolerance, 7.0 Ω dynamic impedance, thermal resistance of 250 °C/W (junction-to-lead), and compatibility with manual or wave soldering at 260 °C for 10 s.
Technical Context
This discrete Zener diode functions as a two-terminal shunt voltage regulator, maintaining stable output voltage across a wide operating current range (0.25 mA to 7.0 mA) and extreme temperature span (–65°C to +175°C). Its glass DO-35 package provides hermetic sealing and inherent radiation hardness per MicroNote 050.
It exhibits minimal junction capacitance (typical <2 pF at 0 V, per Figure 2), low forward voltage (≤1.5 V @ 200 mA), and ESD insensitivity (MIL-STD-750 Method 1020). The device is rated for 0.5 W steady-state power dissipation at 25°C with linear derating above 50°C lead temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 18 V ±5% - defines regulated output voltage under 7.0 mA test current; tight tolerance enables accurate biasing in precision references. |
| Zener Impedance | 7.0 Ω @ IZT = 7.0 mA - low dynamic resistance ensures minimal voltage deviation under load current changes. |
| Power Dissipation | 500 mW @ 25°C - sets maximum continuous power handling; derates linearly above 50°C lead temperature. |
| Operating Temperature | –65°C to +175°C - supports deployment in aerospace, downhole, and military environments without derating. |
| Thermal Resistance | 250 °C/W (junction-to-lead, 3/8″ lead length) - determines temperature rise per watt; critical for thermal design on PCBs with limited copper area. |
| Temp. Coefficient | +0.085 %/°C - positive drift rate allows predictable voltage shift over temperature; used in compensated reference designs. |
| Reverse Leakage | ≤0.1 μA @ VR = 14.4 V - ultra-low leakage preserves accuracy in high-impedance bias networks. |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-lead package with cathode indicated by a single black band. Leads are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026. Weight: 0.2 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Ground reference terminal during Zener operation | Connected to circuit ground or lower-potential node; reverse-biased configuration requires cathode at higher potential. |
| Cathode | Regulated output terminal during Zener operation | Banded end; connected to input supply; maintains stable 18 V relative to anode when reverse current ≥0.25 mA. |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N52xxB standard; guaranteed limits on VZ, IR, ZZT, ZZK, VF, and αVZ - ensures cross-manufacturer interchangeability. |
| Radiation-hardened construction | Inherently radiation tolerant per MicroNote 050 - suitable for space-grade and nuclear instrumentation applications without additional shielding. |
| ESD-insensitive design | Passes MIL-STD-750 Method 1020 - eliminates need for ESD handling protocols during assembly or field service. |
| Low-capacitance junction | Typical <2 pF (per Figure 2) - preserves signal integrity in RF coupling, timing, and high-frequency feedback paths. |
| Flexible mounting | Axial-leaded DO-35 form factor supports through-hole insertion, clinching, and wave soldering - compatible with legacy and high-reliability assembly lines. |
Applications
| Voltage Reference Supply | Overvoltage Clamp |
|---|---|
Use Scenario: Providing stable 18 V reference for ADC drivers, op-amp biasing, or DAC output buffers in industrial sensor signal chains. IC Role / Device Role / Timing Role: Shunt voltage reference element establishing precise DC offset or gain-setting node. Use Value: 5% tolerance and +0.085 %/°C TC enable ≤±0.5% total error over –40°C to +85°C ambient without trimming. | Use Scenario: Protecting microcontroller I/O pins or analog front-end inputs from transient surges exceeding 18 V. IC Role / Device Role / Timing Role: Passive clamping device diverting excess energy to ground when input exceeds 18 V. Use Value: 7.0 Ω Zener impedance ensures fast response and minimal overshoot during 100 ns–1 µs transients. |
| Current Source Bias | Temperature-Stable Oscillator Bias |
Use Scenario: Setting constant current for LED drivers or transistor bias networks using resistor-Zener topology. IC Role / Device Role / Timing Role: Voltage-defined current source anchor point enabling predictable emitter/base current. Use Value: 0.1 μA max reverse leakage at 14.4 V minimizes error in nanoamp-level bias currents. | Use Scenario: Stabilizing bias voltage for crystal oscillator amplifier stages where frequency drift must be minimized. IC Role / Device Role / Timing Role: Temperature-compensated DC supply rail for oscillator core transistors. Use Value: Positive +0.085 %/°C TC counterbalances negative TC of silicon transistors, reducing overall oscillator drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4746A | 18 V ±5%, 1.0 W power rating, DO-41 package, 20 Ω Zener impedance @ 19 mA | Higher power handling but larger footprint and higher dynamic impedance - less suitable for low-current precision references | Select 1N4746A only when >500 mW dissipation or higher surge capability is required; not drop-in due to DO-41 vs. DO-35 mechanical mismatch. |
| MMBZ5248B | 18 V ±5%, SOT-23 surface-mount package, 200 mW rating, 20 Ω Zener impedance @ 20 mA | Smaller size and automated assembly compatibility, but reduced power and higher impedance limit use in precision analog rails | Choose MMBZ5248B for space-constrained PCBs where 200 mW suffices; verify thermal pad layout and reflow profile compatibility. |
Compared with 1N4746A and MMBZ5248B, the 1N5248B offers optimal balance of precision (7.0 Ω impedance), ruggedness (–65°C to +175°C), and compact axial form - making it preferred for high-reliability, low-power, through-hole voltage references where thermal and radiation performance are critical.
Availability
1N5248B is available at Aetrix Electronics and suitable for voltage reference supplies, overvoltage clamps, and current-source bias networks requiring stable component supply, long-term obsolescence resilience, and extended temperature support.
Supply support for 1N5248B 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, radiation-hardened, and aerospace-grade components.
The 1N52xxB series was engineered for mission-critical analog regulation in defense, space, and industrial systems - prioritizing parameter stability across extreme temperature and radiation environments over cost or consumer-grade scalability.
FAQ
What is the Zener voltage tolerance for the 1N5248B?
The 1N5248B has a nominal Zener voltage of 18 V with a guaranteed tolerance of ±5%, as confirmed by Microsemi's official datasheet (Rev D, 2005) and JEDEC registration. This tolerance applies under standard test conditions (IZT = 7.0 mA, TA = 25°C) and is tighter than the base 1N52xx series' ±20% specification.
Does the 1N5248B require heatsinking in typical applications?
No, the 1N5248B does not require external heatsinking in standard applications. Its 500 mW power rating and 250 °C/W junction-to-lead thermal resistance allow safe operation up to 7.0 mA at 18 V (126 mW) with minimal temperature rise when leads are trimmed to 3/8″ (10 mm) from the glass body - well within its derating curve.
Is the 1N5248B RoHS compliant?
Yes, RoHS-compliant versions of the 1N5248B are available with the "e3" suffix (e.g., 1N5248Be3), featuring annealed matte-tin plating per MIL-STD-750 Method 2026. Standard 1N5248B uses tin-lead plating unless otherwise specified.
What is the maximum reverse leakage current for the 1N5248B?
The maximum reverse leakage current for the 1N5248B is 0.1 μA when tested at VR = 14.4 V (80% of nominal VZ), as specified in the Electrical Characteristics table on page 1 of the Microsemi datasheet. This ultra-low leakage supports high-impedance bias network accuracy.
Can the 1N5248B be used in place of the 1N5248 (no suffix)?
No - the 1N5248B is not interchangeable with the unsuffixed 1N5248. The "B" suffix denotes ±5% tolerance and full six-parameter guarantee (VZ, IR, ZZT, ZZK, VF, αVZ), whereas the base 1N5248 has only JEDEC ±20% tolerance and guaranteed limits on just VZ, IR, and VF. Substitution risks reference inaccuracy and thermal instability.
1N5248B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 21 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 14 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N5248B FAQ
1.How can I place an order for 1N5248B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5248B 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 1N5248B reliable?
The price and inventory of 1N5248B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5248B is usually 5 days.
3.What payment methods are accepted for 1N5248B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5248B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5248B?
1N5248B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5248B 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 1N5248B?
For technical support, including 1N5248B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5248B requirements.
6.How does Aetrix verify that 1N5248B is sourced from the original manufacturer or authorized distributors?
All 1N5248B 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 1N5248B meets industry standards.
7.What is the process for return or replacement of 1N5248B?
All 1N5248B units undergo pre-shipment inspection (PSI). If there is an issue with 1N5248B, 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 1N5248B part is unused and in its original packaging.
Return procedure for 1N5248B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5248B 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…
