My Inquiry
My Account
Microchip Technology 1N5239B/TR
- Part No.:
- 1N5239B/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5239B/TR.pdf
- Description:
- DIODE ZENER 9.1V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:8,667
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5239B/TR from Microsemi is a 9.1 V, ±5% tolerance, 500 mW glass axial-lead Zener diode in DO-35 (DO-204AH) package, rated for 20 mA test current and 10 Ω dynamic impedance at IZK = 0.25 mA, used for precision voltage regulation in low-power analog reference and power supply feedback circuits.
For engineers reviewing the 1N5239B/TR datasheet, 1N5239B/TR pinout, 1N5239B/TR application, or 1N5239B/TR equivalent, this part serves as a stable, temperature-compensated shunt regulator with known thermal resistance (310 °C/W on FR4), low capacitance, and RoHS-compliant plating - critical for space-constrained, high-reliability DC biasing and overvoltage protection designs.
Technical Context
This Zener operates in reverse breakdown mode with cathode band indicating polarity; regulation requires forward-biased cathode relative to anode. Its 9.1 V nominal voltage is specified at 20 mA (IZT), with dynamic impedance measured at both IZT and IZK = 0.25 mA to ensure sharp knee stability.
Temperature coefficient is +0.068 %/°C (measured from 25 °C to 125 °C at rated IZT), and maximum reverse leakage is 5 μA at VR = 7.3 V. The device sustains operation from –65 °C to +175 °C and exhibits minimal capacitance per Figure 2 of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage (VZ) | 9.1 V at 20 mA test current - defines regulated output voltage under standard bias conditions |
| Tolerance | ±5% (B suffix) - ensures voltage accuracy within ±0.455 V for predictable circuit margining |
| Power Dissipation | 500 mW at 25 °C - sets maximum continuous power handling before thermal derating applies |
| Zener Impedance (ZZK) | 10 Ω at IZK = 0.25 mA - indicates low dynamic resistance near knee, supporting stable low-current regulation |
| Temp. Coefficient (αVZ) | +0.068 %/°C - quantifies voltage drift with temperature; enables compensation in precision references |
| Max Reverse Leakage (IR) | 5 μA at VR = 7.3 V - defines minimum off-state current, critical for low-power standby circuits |
| Operating Temp. Range | –65 °C to +175 °C - supports deployment in aerospace, industrial, and downhole environments |
Pinout & Package
DO-35 (DO-204AH) hermetically sealed glass axial-lead package with tin-lead or RoHS-compliant matte-tin plating; cathode identified by single black band; weight 0.2 g; lead length ≥10 mm for thermal rating compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unbanded end) | Reference ground node | Connected to circuit common; reverse voltage applied between cathode and this terminal |
| Cathode (banded end) | Zener regulation node | Connected to regulated voltage rail; must be held positive relative to anode for breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered DO-35 construction | Ensures mechanical and thermal interchangeability with legacy 1N52xx designs across OEMs |
| RoHS-compliant "e3" option | Enables compliance with environmental directives without sacrificing electrical performance or reliability |
| Stable 9.1 V regulation at 20 mA | Provides consistent reference voltage for feedback loops in linear regulators and sensor biasing |
| Radiation-hardened design | Inherently radiation-tolerant per MicroNote 050 - suitable for space-grade and nuclear instrumentation |
| Low 10 Ω ZZK at 0.25 mA | Supports reliable regulation even in ultra-low-current applications such as battery-monitoring thresholds |
Applications
| Power Supply Feedback | Overvoltage Protection |
|---|---|
Use Scenario: Regulating output voltage in discrete linear power supplies using TL431-like topology with external pass transistor. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 9.1 V setpoint for error amplifier comparison. Use Value: Enables accurate ±5% output regulation without integrated controller ICs, reducing BOM cost and complexity. |
Use Scenario: Clamping transient surges on 12 V automotive sensor lines during load dump events. IC Role / Device Role / Timing Role: Fast-acting crowbar element diverting excess energy to ground when line voltage exceeds 9.1 V. Use Value: Limits peak voltage to safe levels for downstream op-amps and ADC inputs without adding response delay. |
| Temperature-Stable Reference | Low-Power Biasing |
Use Scenario: Generating fixed bias for precision thermistor measurement bridges in industrial process controllers. IC Role / Device Role / Timing Role: Primary voltage reference with +0.068 %/°C TC, compensated via resistor network. Use Value: Delivers <10 mV drift over –40 °C to +85 °C ambient, enabling sub-0.5 °C temperature resolution. |
Use Scenario: Providing gate bias for high-side MOSFETs in battery-powered IoT node power management. IC Role / Device Role / Timing Role: Low-quiescent-current Zener supplying 9.1 V to enable logic-level FET turn-on. Use Value: Draws only 5 μA leakage at 7.3 V, extending shelf life and sleep-mode battery runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4739A | 9.1 V, ±5%, 1 W power rating, DO-41 package, higher thermal resistance (300 °C/W junction-to-ambient) | Higher power handling but larger footprint; less suitable for compact PCBs with tight thermal constraints | Select when >500 mW dissipation is required and board space allows DO-41 mounting |
| MMBZ5239B | 9.1 V, ±5%, SOT-23 surface-mount package, 200 mW rating, 10 Ω ZZK at 0.25 mA | Enables automated assembly and denser layouts but lower power and different thermal path | Select for space-constrained, high-volume PCBs where reflow compatibility and miniaturization outweigh power needs |
Compared with 1N5239B/TR, 1N4739A offers higher power at the cost of size and thermal efficiency, while MMBZ5239B trades power and ruggedness for SMT scalability - choice depends on thermal budget, layout density, and production method.
Availability
1N5239B/TR is available at Aetrix Electronics and suitable for power supply feedback, overvoltage protection, and temperature-stable reference applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for 1N5239B/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 (now part of Microchip Technology) is a U.S.-based semiconductor company specializing in high-reliability, radiation-hardened, and high-voltage analog components for aerospace, defense, and industrial markets.
The 1N52xxB series was designed specifically for precision shunt regulation in mission-critical analog systems where long-term stability, wide temperature operation, and JEDEC-standard interchangeability are mandatory.
FAQ
What is the Zener voltage tolerance of the 1N5239B/TR?
The 1N5239B/TR has a nominal Zener voltage of 9.1 V with a guaranteed tolerance of ±5%, as indicated by the "B" suffix per JEDEC specification. This means the actual breakdown voltage falls between 8.645 V and 9.555 V when tested at 20 mA and 25 °C, enabling predictable design margins in voltage-reference circuits.
Does the 1N5239B/TR require heatsinking in typical applications?
The 1N5239B/TR does not require external heatsinking when operated ≤500 mW at ambient temperatures ≤50 °C with 10 mm lead length from the glass body. Its thermal resistance is 250 °C/W junction-to-lead; on FR4 with 4 mm² copper pads, it rises to 310 °C/W - derating curves in the datasheet define safe operating area above 50 °C ambient.
Is the 1N5239B/TR RoHS compliant?
Yes - the "TR" suffix denotes tape-and-reel packaging, and RoHS compliance is achieved when the part is ordered with the "e3" suffix (e.g., 1N5239B-e3/TR). Standard 1N5239B/TR uses tin-lead plating unless otherwise specified; RoHS-compliant matte-tin plating meets MIL-STD-750 Method 2026.
What is the maximum reverse leakage current for the 1N5239B/TR?
The 1N5239B/TR specifies a maximum reverse leakage current (IR) of 5 μA at VR = 7.3 V (80% of nominal VZ), measured at 25 °C. This low leakage supports use in battery-backed circuits and high-impedance sensing nodes where standby current must remain below 10 μA.
Can the 1N5239B/TR be used in place of the 1N4739A?
The 1N5239B/TR and 1N4739A share identical 9.1 V ±5% Zener voltage but differ in package (DO-35 vs. DO-41), power rating (500 mW vs. 1 W), and thermal resistance. They are functionally interchangeable in low-power roles, but substituting 1N5239B/TR into a 1 W design risks thermal overload - verify power dissipation and layout constraints before replacement.
1N5239B/TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AH, DO-35, Axial
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 9.1 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 10 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 7 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)
1N5239B/TR FAQ
1.How can I place an order for 1N5239B/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5239B/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 1N5239B/TR reliable?
The price and inventory of 1N5239B/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5239B/TR is usually 5 days.
3.What payment methods are accepted for 1N5239B/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5239B/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5239B/TR?
1N5239B/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5239B/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 1N5239B/TR?
For technical support, including 1N5239B/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5239B/TR requirements.
6.How does Aetrix verify that 1N5239B/TR is sourced from the original manufacturer or authorized distributors?
All 1N5239B/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 1N5239B/TR meets industry standards.
7.What is the process for return or replacement of 1N5239B/TR?
All 1N5239B/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5239B/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 1N5239B/TR part is unused and in its original packaging.
Return procedure for 1N5239B/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5239B/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…
