My Inquiry
My Account
Microchip Technology 1N982B
- Part No.:
- 1N982B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N982B.pdf
- Description:
- DIODE ZENER 75V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,530
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N982B from Microsemi is a silicon 500 mW axial-leaded Zener diode in DO-35 (DO-204AH) package, rated for 75 V nominal Zener voltage at ±5% tolerance, 1.7 mA test current, and 270 Ω dynamic impedance. It operates across –65°C to +175°C and regulates voltage in low-power reference and protection circuits.
For engineers reviewing the 1N982B datasheet, 1N982B pinout, 1N982B application, or 1N982B equivalent, key selection criteria include its 75 V regulation point, 270 Ω Zener impedance at 1.7 mA, –65°C to +175°C operating range, DO-35 mechanical compatibility, and RoHS-compliant e3 variant availability.
Technical Context
The 1N982B functions as a two-terminal voltage reference device with sharp reverse-breakdown knee, defined by JEDEC-standardized Zener characteristics. Its regulation relies on controlled avalanche breakdown, exhibiting a +0.098 %/°C temperature coefficient and minimal capacitance per Figure 3.
It delivers stable 75 V regulation over a broad reverse current range (IZK = 0.25 mA to IZM = 5.0 mA), with forward voltage ≤1.1 V at 200 mA and thermal resistance of 250 °C/W junction-to-lead at 3/8″ lead length.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 75 V ±5% - precise DC reference level for biasing, clamping, or threshold detection |
| Zener Test Current | 1.7 mA - standardized operating point for measuring VZ and ZZT |
| Zener Impedance | 270 Ω at 1.7 mA - determines regulation stability under load current variation |
| Max DC Zener Current | 5.0 mA - maximum continuous reverse current before exceeding 400 mW dissipation at 75°C lead temp |
| Operating Temperature | –65°C to +175°C - supports aerospace, downhole, and high-reliability industrial environments |
| Forward Voltage | ≤1.1 V @ 200 mA - ensures predictable conduction in forward-biased protection paths |
| Temp Coefficient αVZ | +0.098 %/°C - quantifies drift rate of 75 V reference with ambient temperature change |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed glass axial-leaded case with cathode band marking. Terminals are tin-lead or RoHS-compliant matte-tin plated, solderable per MIL-STD-750 Method 2026.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node during Zener operation; carries forward current when biased |
| Cathode | Banded end | Connected to higher-potential node during Zener regulation; defines polarity-sensitive mounting |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures cross-manufacturer interchangeability and standardized test conditions per 1N957B–1N992B family |
| Hermetic glass DO-35 package | Provides long-term reliability and moisture resistance in harsh environments without conformal coating |
| Nonsensitive to ESD | Rated per MIL-STD-750 Method 1020 - eliminates need for external ESD protection in handling and assembly |
| Radiation-hardened construction | Inherently resistant to total ionizing dose per MicroNote 050 - suitable for space and nuclear applications |
| Flexible axial-lead mounting | Enables through-hole PCB, chassis, or socket-based integration with standard lead-forming tooling |
Applications
| Overvoltage Clamp in Sensor Signal Conditioning | Reference Voltage Source in Precision Power Supply |
|---|---|
Use Scenario: Protects analog front-end inputs of industrial pressure sensors from transient surges up to ±1 kV. IC Role / Device Role / Timing Role: Two-terminal shunt clamp placed between signal line and ground, conducting only above 75 V. Use Value: Limits input voltage to safe levels without loading the sensor output, leveraging 270 Ω ZZT for predictable clamping behavior. | Use Scenario: Generates stable 75 V reference for feedback loop of isolated DC-DC converter in telecom power systems. IC Role / Device Role / Timing Role: Passive voltage reference providing setpoint for error amplifier; operated at 1.7 mA IZT. Use Value: Delivers ±5% accuracy and +0.098 %/°C drift control, enabling <±1.5% total output regulation over –40°C to +85°C. |
| ESD Protection in Legacy RS-232 Interface | Threshold Detector in High-Voltage Battery Monitor |
Use Scenario: Shields UART transceivers against contact ESD events in factory automation terminals. IC Role / Device Role / Timing Role: Bidirectional clamp (anode-to-ground, cathode-to-line) absorbing ±8 kV HBM pulses. Use Value: Survives repeated ESD stress per MIL-STD-750 Method 1020 without parameter shift, eliminating need for TVS diodes. | Use Scenario: Triggers shutdown logic when lithium-ion stack voltage exceeds 75 V in EV battery management units. IC Role / Device Role / Timing Role: Zener-fed comparator input reference; reverse-biased until threshold crossed. Use Value: Enables accurate 75 V trip point with minimal parts count, supported by tight 5% tolerance and stable 1.7 mA operating point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4742A (ON Semiconductor) | 12 V Zener, 1 W rating, DO-41 package, ±5% tolerance | Lower voltage, higher power - unsuitable for 75 V use but preferred where 12 V reference and thermal margin are required | Select only if system requires 12 V regulation and >500 mW dissipation capability |
| BZX55C75 (Vishay) | 75 V Zener, 500 mW, DO-35, ±5% tolerance, 300 Ω ZZT @ 1 mA | Nearly identical electrical specs but 300 Ω vs. 270 Ω ZZT; slightly higher leakage at 5 V reverse bias | Drop-in alternative for cost-sensitive designs where 30 mΩ ZZT difference is acceptable |
Compared with 1N982B, the BZX55C75 offers near-identical 75 V regulation and DO-35 fit but with marginally higher dynamic impedance; the 1N4742A serves different voltage-class applications entirely and cannot replace 1N982B in 75 V roles.
Availability
1N982B is available at Aetrix Electronics and suitable for overvoltage clamping, precision voltage reference, and ESD protection applications requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for 1N982B 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 high-voltage analog components.
The 1N957B–1N992B Zener series was designed for military, aerospace, and industrial applications demanding wide temperature operation, hermetic packaging, and JEDEC-standardized performance.
FAQ
What is the nominal Zener voltage and tolerance of the 1N982B?
The 1N982B has a nominal Zener voltage of 75 V with a tolerance of ±5%, as indicated by the "B" suffix per JEDEC standard. This tolerance is verified at 1.7 mA test current and 25°C ambient, and applies across its full operating temperature range of –65°C to +175°C.
What package type does the 1N982B use, and what are its mechanical features?
The 1N982B uses the DO-35 (DO-204AH) hermetically sealed glass axial-leaded package. It features a cathode band marking, tin-lead or RoHS-compliant matte-tin plating, and weighs 0.2 grams. Mounting clips must be held 0.375–0.500 inches from the body during testing per datasheet Note 2.
Can the 1N982B be used in high-temperature environments such as downhole drilling equipment?
Yes, the 1N982B is rated for operation from –65°C to +175°C and exhibits inherent radiation hardness per Microsemi MicroNote 050. Its DO-35 glass package and metallurgical construction make it suitable for downhole, aerospace, and other extreme-temperature applications where polymer-packaged alternatives fail.
What is the maximum steady-state power dissipation for the 1N982B, and under what conditions?
The 1N982B delivers 500 mW steady-state power at lead temperature <50°C with 3/8″ (10 mm) lead length from body. Derating begins above 50°C, reaching 400 mW at 75°C lead temperature. On FR4 board with specified copper pads, max dissipation is 480 mW at 25°C ambient per datasheet Figure 1.
Is there a RoHS-compliant version of the 1N982B, and how is it identified?
Yes, the RoHS-compliant version of the 1N982B is identified by adding the "e3" suffix, resulting in part number 1N982Be3. It uses annealed matte-tin plating instead of tin-lead and meets EU RoHS Directive 2011/65/EU requirements while maintaining identical electrical and thermal specifications.
1N982B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 270 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 56 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 200 mA
- Operating Temperature:
- -65°C ~ 175°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- DO-204AH (DO-35)
1N982B FAQ
1.How can I place an order for 1N982B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N982B 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 1N982B reliable?
The price and inventory of 1N982B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N982B is usually 5 days.
3.What payment methods are accepted for 1N982B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N982B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N982B?
1N982B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N982B 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 1N982B?
For technical support, including 1N982B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N982B requirements.
6.How does Aetrix verify that 1N982B is sourced from the original manufacturer or authorized distributors?
All 1N982B 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 1N982B meets industry standards.
7.What is the process for return or replacement of 1N982B?
All 1N982B units undergo pre-shipment inspection (PSI). If there is an issue with 1N982B, 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 1N982B part is unused and in its original packaging.
Return procedure for 1N982B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N982B 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…
