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Microchip Technology 1N970B
- Part No.:
- 1N970B
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-204AA, DO-7, Axial
- Datasheet:
-
1N970B.pdf
- Description:
- DIODE ZENER 24V 500MW DO7
- Quantity:
- Payment:
- Shipping:
Inventory:8,954
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Product details
Overview
1N970B from Microsemi is a silicon 500 mW axial-lead Zener diode with nominal Zener voltage of 24 V, ±5% tolerance (B suffix), 5.2 mA Zener test current (IZT), 750 Ω maximum Zener impedance at IZT, and +0.088 %/°C temperature coefficient. It regulates voltage in low-power reference and protection circuits across industrial and aerospace systems operating from –65°C to +175°C.
For engineers reviewing the 1N970B datasheet, 1N970B pinout, 1N970B application, or 1N970B equivalent, key selection criteria include its DO-35 glass package, cathode-band polarity marking, 24 V regulation stability over wide temperature range, and compatibility with manual or wave-soldered axial-leaded PCB assembly.
Technical Context
The 1N970B operates as a reverse-biased voltage reference device, maintaining stable 24 V output across 15 mA to 80 mA DC Zener current (IZM = 15 mA) with minimal dynamic impedance variation. Its Zener knee is sharp and stable per JEDEC registration, verified via dual-point AC impedance measurement at 10% of IZT.
Thermal design relies on junction-to-lead resistance of 250 °C/W (3/8″ lead length) and junction-to-ambient resistance of 310 °C/W on FR4 board with defined copper pad geometry. Forward voltage is ≤1.1 V at 200 mA, confirming standard silicon P-N junction behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 24 V - precise regulation point for mid-range voltage references and clamp thresholds |
| Zener Test Current (IZT) | 5.2 mA - standardized bias point for measuring VZ and ZZT under JEDEC conditions |
| Zener Impedance (ZZT) | 750 Ω max @ IZT - defines regulation stiffness and load-induced voltage deviation |
| Max DC Zener Current (IZM) | 15 mA - maximum continuous current yielding 400 mW dissipation at 75°C lead temp |
| Temp Coefficient (αVZ) | +0.088 %/°C - positive drift rate used to calculate VZ shift over –65°C to +175°C range |
| Reverse Leakage (IR) | 5 μA @ 18.2 V - ensures low standby power loss below breakdown threshold |
| Power Dissipation | 500 mW @ TL < 50°C - derates linearly above 50°C per Figure 1 curve |
Pinout & Package
Package: DO-35 (DO-204AH), hermetically sealed axial-lead glass body, 0.2 g weight, tin-lead or RoHS-compliant matte-tin plating, cathode indicated by colored band.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Non-banded end | Connected to lower-potential node; forward conduction path when biased >1.1 V |
| Cathode | Banded end | Connected to higher-potential node; Zener regulation occurs when reverse-biased ≥24 V |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC-registered Zener series | Ensures cross-manufacturer interchangeability and standardized test methodology |
| ±5% voltage tolerance (B suffix) | Meets general-purpose regulation accuracy without premium cost of tighter C/D tolerances |
| –65°C to +175°C operating range | Supports deployment in extreme environments including avionics, downhole tools, and military systems |
| Nonsensitive to ESD (MIL-STD-750 Method 1020) | Eliminates need for external ESD protection during handling and assembly |
| Inherently radiation-hardened | Validated per Microsemi MicroNote 050 for TID tolerance in space and nuclear applications |
Applications
| Industrial Power Supply Reference | Aerospace Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback node in isolated DC-DC converter error amplifiers. IC Role / Device Role / Timing Role: Zener diode providing fixed 24 V reference for optocoupler input biasing. Use Value: Maintains regulation accuracy within ±5% across –40°C to +85°C ambient while surviving 150 V surge transients. |
Use Scenario: Overvoltage protection on 28 V aircraft bus monitoring circuits. IC Role / Device Role / Timing Role: Shunt clamp limiting sensed voltage to 24 V ±0.088%/°C drift. Use Value: Withstands 175°C storage and meets MIL-STD-750 ESD robustness for airborne electronics. |
| Test Equipment Calibration Standard | Automotive Sensor Bias Network |
Use Scenario: Precision voltage reference in handheld multimeter internal ADC reference dividers. IC Role / Device Role / Timing Role: Stable 24 V Zener source for ratiometric scaling of analog inputs. Use Value: Low 5 μA leakage at 18.2 V ensures minimal loading error on high-impedance divider networks. |
Use Scenario: Biasing thermistor-based coolant temperature sensor in engine control modules. IC Role / Device Role / Timing Role: Zener-regulated 24 V supply for sensor excitation and signal conditioning. Use Value: Operates reliably across –40°C cold crank to +125°C under-hood thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4749A | 24 V, ±5%, 1 W power rating, DO-41 package, 20 Ω ZZT @ 10.5 mA | Higher power and lower impedance but larger footprint and different thermal profile | Select when >500 mW dissipation or <100 Ω dynamic impedance is required |
| BZX55-C24 | 24 V, ±5%, 500 mW, DO-35, 80 Ω ZZT @ 5 mA, RoHS-only, no -1 metallurgical bond option | Lacks military-grade internal bond and radiation hardening; limited to commercial temp range | Choose for cost-sensitive consumer designs where radiation tolerance and extended temperature are not required |
Compared with 1N970B, 1N4749A offers higher power margin and lower impedance but requires layout revision due to DO-41 size; BZX55-C24 matches power and package but omits radiation hardness and –65°C capability, making it unsuitable for aerospace or downhole use.
Availability
1N970B is available at Aetrix Electronics and suitable for industrial power supplies, aerospace clamping circuits, calibration standards, and automotive sensor bias networks requiring stable component supply with long lifecycle assurance.
Supply support for 1N970B 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-temperature analog components for defense, aerospace, and industrial markets.
The 1N957B–1N992B series was designed specifically for mission-critical voltage regulation where extended temperature operation, ESD immunity, and inherent radiation tolerance are mandatory.
FAQ
What is the Zener voltage tolerance for 1N970B?
The 1N970B has a nominal Zener voltage of 24 V with ±5% tolerance, indicated by the "B" suffix per JEDEC standard. This means the actual measured VZ at 5.2 mA IZT falls between 22.8 V and 25.2 V at 25°C, and the tolerance band remains valid across the full –65°C to +175°C operating range.
Can 1N970B be used in surface-mount designs?
No - the 1N970B is exclusively packaged in the axial-leaded DO-35 (DO-204AH) glass case. For surface-mount equivalents, Microsemi offers the MLL970B in DO-213AA (MELF) package, which shares identical electrical specs but requires reflow-compatible layout and soldering profiles.
What is the maximum steady-state power dissipation for 1N970B?
The 1N970B is rated for 500 mW at lead temperature (TL) below 50°C with 3/8″ (10 mm) lead length from the body. At ambient temperature (TA) < 25°C on FR4 board with specified copper pads, it delivers 480 mW. Derating follows the linear curve in Figure 1, reaching zero at 175°C junction temperature.
Does 1N970B require external ESD protection?
No - the 1N970B is nonsensitive to ESD per MIL-STD-750 Method 1020, meaning it withstands typical handling and assembly electrostatic events without degradation. No external TVS or RC filters are needed solely for ESD mitigation in standard manufacturing environments.
How does temperature affect the Zener voltage of 1N970B?
The 1N970B exhibits a +0.088 %/°C temperature coefficient, meaning its Zener voltage increases by approximately 21.12 mV per °C rise above 25°C. At +125°C, VZ rises by ~8.8 V (0.088 × 100), resulting in ~32.8 V regulation - a critical factor in high-temp precision reference design.
1N970B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-204AA, DO-7, Axial
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 24 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 33 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 18.2 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-7
1N970B FAQ
1.How can I place an order for 1N970B through Aetrix?
Please submit a Request for Quotation (RFQ) for 1N970B 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 1N970B reliable?
The price and inventory of 1N970B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1N970B is usually 5 days.
3.What payment methods are accepted for 1N970B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1N970B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1N970B?
1N970B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1N970B 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 1N970B?
For technical support, including 1N970B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1N970B requirements.
6.How does Aetrix verify that 1N970B is sourced from the original manufacturer or authorized distributors?
All 1N970B 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 1N970B meets industry standards.
7.What is the process for return or replacement of 1N970B?
All 1N970B units undergo pre-shipment inspection (PSI). If there is an issue with 1N970B, 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 1N970B part is unused and in its original packaging.
Return procedure for 1N970B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1N970B 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
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