My Inquiry
My Account
Microchip Technology 1N5237A/TR
- Part No.:
- 1N5237A/TR
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AH, DO-35, Axial
- Datasheet:
-
1N5237A/TR.pdf
- Description:
- DIODE ZENER 8.2V 500MW DO204AH
- Quantity:
- Payment:
- Shipping:
Inventory:3,165
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
1N5237A/TR from Microsemi is a 500 mW glass axial-lead Zener diode with nominal Zener voltage of 8.2 V ±10%, 20 mA test current, 8 Ω dynamic impedance at IZT, and operating temperature range of −65 °C to +175 °C. It provides stable voltage regulation in low-power reference and protection circuits, such as power supply feedback loops and overvoltage clamp stages.
For engineers reviewing the 1N5237A/TR datasheet, 1N5237A/TR pinout, 1N5237A/TR application, or 1N5237A/TR equivalent, key selection criteria include Zener voltage tolerance (±10%), thermal resistance (310 °C/W on FR4), DO-35 package compatibility, and RoHS-compliant "e3" availability via suffix.
Technical Context
This device operates in reverse-biased breakdown mode, delivering precise DC voltage regulation across a broad current range (0.25 mA to 20 mA). Its Zener impedance of 8 Ω at 20 mA ensures minimal output voltage variation under load transients.
The 1N5237A/TR exhibits a positive temperature coefficient of +0.062 %/°C (measured from 25 °C to 125 °C at rated IZT), enabling predictable drift behavior in temperature-varying environments. Its nonsensitive ESD performance (MIL-STD-750 Method 1020) and hermetically sealed DO-35 glass package support reliability in industrial and aerospace-grade designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 8.2 V ±10% - defines regulated output voltage under 20 mA test current with guaranteed min/max bounds |
| Power Dissipation | 500 mW at 25 °C - maximum continuous power before thermal derating begins; drops to 480 mW at TA = 25 °C on FR4 |
| Zener Impedance | 8 Ω at IZT = 20 mA - low dynamic resistance enables tight regulation during current fluctuations |
| Reverse Current | 30 μA @ VR = 6.2 V - leakage level below regulation threshold; critical for low-power standby operation |
| Operating Temperature | −65 °C to +175 °C - supports deployment in extreme environments including downhole, avionics, and engine control units |
| Thermal Resistance | 310 °C/W junction-to-ambient on FR4 - determines temperature rise per watt; requires copper pad design per spec |
| Forward Voltage | ≤1.5 V @ 200 mA - ensures predictable conduction in forward-bias fault conditions or dual-role circuits |
Pinout & Package
DO-35 (DO-204AH) glass axial-leaded package with cathode band marking; leads 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 lead | Connected to lower-potential node; conducts forward current when biased positively relative to cathode |
| Cathode | Banded lead | Connected to higher-potential node; Zener breakdown occurs when cathode voltage exceeds anode by ≥8.2 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener | Complies with JEDEC 1N5237 standard; guarantees VZ, IR, and VF limits per MIL-PRF-19500 |
| Tight thermal stability | +0.062 %/°C tempco enables predictable voltage drift over −65 °C to +175 °C operating range |
| Low capacitance | Typical <2 pF - minimizes signal coupling in high-frequency bias/reference networks |
| Radiation hardness | Inherently radiation-hard per MicroNote 050 - suitable for space-qualified and nuclear instrumentation systems |
| ESD robustness | Nonsensitive per MIL-STD-750 Method 1020 - withstands handling without special precautions |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Protection |
|---|---|
Use Scenario: Used in TL431-based adjustable linear regulators to set output voltage via resistive divider. IC Role / Device Role / Timing Role: Provides stable 8.2 V reference point for error amplifier comparison. Use Value: Tolerance of ±10% and low 8 Ω impedance ensure ≤1% output voltage error across line/load variations. | Use Scenario: Placed across microcontroller I/O pins to limit transient overvoltage from ESD or inductive kickback. IC Role / Device Role / Timing Role: Acts as shunt clamping element that conducts above 8.2 V to divert surge current. Use Value: Fast response and 500 mW rating absorb 1 kV HBM ESD pulses without degradation. |
| Temperature-Stable Bias Network | Aerospace Voltage Monitor |
Use Scenario: Supplies reference voltage to op-amp input stages in precision analog sensor front-ends. IC Role / Device Role / Timing Role: Delivers fixed bias point with predictable +0.062 %/°C drift for calibration compensation. Use Value: Enables first-order temperature compensation in pressure or strain gauge amplifiers. | Use Scenario: Integrated into redundant power monitoring circuits aboard satellite power distribution units. IC Role / Device Role / Timing Role: Serves as primary Zener reference in radiation-hardened voltage supervisor ICs. Use Value: Inherent radiation hardness and −65 °C to +175 °C range meet MIL-PRF-19500 screening requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4738A | Same 8.2 V ±5% tolerance, but 1 W power rating and DO-41 package; higher thermal mass and dissipation | Preferred in higher-current regulation where >500 mW headroom is required; not drop-in due to larger footprint | Select 1N4738A only if board layout allows DO-41 and system demands >500 mW continuous dissipation |
| MMBZ5237BS | SOT-23 surface-mount package; same 8.2 V ±10%, 200 mW rating; 10x smaller footprint, higher thermal resistance | Suitable for space-constrained PCBs; requires rework for thermal pad design and lacks axial-lead mechanical robustness | Choose MMBZ5237BS when automated assembly and miniaturization outweigh axial-lead serviceability needs |
Compared with 1N4738A and MMBZ5237BS, the 1N5237A/TR offers optimal balance of legacy axial-lead serviceability, JEDEC-standardized DO-35 footprint, and verified −65 °C to +175 °C operation-making it preferred for repairable industrial controls and aerospace retrofits where through-hole mounting and extreme temperature resilience are mandatory.
Availability
1N5237A/TR is available at Aetrix Electronics and suitable for power supply feedback references, overvoltage clamp protection, and temperature-stable bias networks requiring stable component supply across extended lifecycle programs.
Supply support for 1N5237A/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 analog, mixed-signal, and radiation-hardened components for defense, aerospace, and industrial markets.
The 1N52xx series was designed specifically for ruggedized voltage regulation in mission-critical systems where long-term stability, wide temperature operation, and JEDEC-standard compliance are non-negotiable.
FAQ
What is the Zener voltage tolerance for 1N5237A/TR?
The 1N5237A/TR has a nominal Zener voltage of 8.2 V with a tolerance of ±10%, as indicated by the "A" suffix per Microsemi's documentation. This tolerance applies under standard test conditions (IZT = 20 mA, TA = 25 °C) and is guaranteed across the full operating temperature range.
Is 1N5237A/TR RoHS compliant?
Yes, the 1N5237A/TR is RoHS compliant when ordered with the "e3" suffix (e.g., 1N5237Ae3/TR). The base part number does not imply RoHS compliance; the "e3" designation confirms annealed matte-tin plating per applicable environmental standards.
What is the maximum power dissipation of 1N5237A/TR on a standard FR4 PCB?
The 1N5237A/TR dissipates up to 480 mW at ambient temperature <25 °C when mounted on FR4 with 4 mm² copper pads and 1 mm track width, per Microsemi's thermal resistance specification of 310 °C/W junction-to-ambient.
Does 1N5237A/TR have a specified temperature coefficient?
Yes, the 1N5237A/TR has a temperature coefficient of +0.062 %/°C, measured between 25 °C and 125 °C at IZT = 20 mA. This value is confirmed in the Electrical Characteristics table for parts numbered 1N5236 through 1N5242 with A or B suffixes.
What package type is used for 1N5237A/TR?
The 1N5237A/TR uses the DO-35 (also designated DO-204AH) glass axial-leaded package. It features a hermetically sealed glass body, tin-lead or RoHS-compliant matte-tin plated leads, and cathode identification via a visible band.
1N5237A/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):
- 8.2 V
- Tolerance:
- ±10%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 8 Ohms
- Current - Reverse Leakage @ Vr:
- 3 µA @ 6.2 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)
1N5237A/TR FAQ
1.How can I place an order for 1N5237A/TR through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N5237A/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 1N5237A/TR reliable?
The price and inventory of 1N5237A/TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N5237A/TR is usually 5 days.
3.What payment methods are accepted for 1N5237A/TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N5237A/TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N5237A/TR?
1N5237A/TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N5237A/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 1N5237A/TR?
For technical support, including 1N5237A/TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N5237A/TR requirements.
6.How does Aetrix verify that 1N5237A/TR is sourced from the original manufacturer or authorized distributors?
All 1N5237A/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 1N5237A/TR meets industry standards.
7.What is the process for return or replacement of 1N5237A/TR?
All 1N5237A/TR units undergo pre-shipment inspection (PSI). If there is an issue with 1N5237A/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 1N5237A/TR part is unused and in its original packaging.
Return procedure for 1N5237A/TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N5237A/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…
