1N970BTR Equivalent & Substitute Parts

Part Overview

The 1N970BTR is a Zener diode rated at 24 V nominal voltage with 500 mW power dissipation, manufactured by onsemi in a DO-35 axial through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 1N970BTR operates across a temperature range of -65°C to 200°C with ±5% voltage tolerance and is suitable for voltage regulation and protection applications requiring precise 24 V reference characteristics.

Key Parameters

Parameter	Value	Unit
Voltage - Zener (Nom)	24	V
Power - Max	500	mW
Tolerance	±5%	—
Impedance (Max)	33	Ohms
Current - Reverse Leakage @ Vr	5	µA @ 18.2 V
Operating Temperature	-65 to 200	°C
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—

Substitute Part Grouping Explanation

Substitution of the 1N970BTR is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - Zener (Nom): 24 V (exact match required)
Tolerance: ±5% (acceptable tolerance band)
Power - Max: 500 mW or greater
Impedance (Max): 33 Ohms or lower
Mounting Type: Through Hole
Operating Temperature Range: Must encompass or match -65°C to 200°C

Package Considerations: Substitutes are grouped into two categories based on physical form factor:

DO-35 Package Equivalents — Direct mechanical and electrical replacements with identical footprint
Alternative Package Equivalents — Different package geometries (DO-41, Axial) that maintain electrical specifications but require PCB layout modification

Substitutes are classified as either Parametric Equivalents (matching all critical electrical parameters) or Similar Parts (meeting functional requirements with acceptable parameter variations).

Parameter Comparison

Part Number	Manufacturer	Vz (Nom)	Tolerance	Power (Max)	Zzt (Max)	Reverse Leakage @ Vr	Temp Range	Package	Product Status
1N970BTR	onsemi	24 V	±5%	500 mW	33 Ω	5 µA @ 18.2 V	-65 to 200°C	DO-35	Obsolete
1N5252B	Microchip Technology	24 V	±5%	500 mW	33 Ω	100 nA @ 18 V	-65 to 175°C	DO-35	Active
1N5252BTR	onsemi	24 V	±5%	500 mW	33 Ω	100 nA @ 18 V	-65 to 200°C	DO-35	Active
1N5252B TR PBFREE	Central Semiconductor Corp	24 V	±5%	500 mW	33 Ω	100 nA @ 18 V	-65 to 200°C	DO-35	Active
1EZ24D5-TP	Micro Commercial Co	24 V	±5%	500 mW	25 Ω	5 µA @ 18.2 V	-55 to 150°C	DO-41	Active
1N4749A	Lumimax Optoelectronic Technology	24 V	±5%	1 W	25 Ω	5 µA @ 18.2 V	-65 to 200°C	DO-41	Active
1N5075	Microchip Technology	24 V	±5%	3 W	10 Ω	5 µA @ 18.2 V	-65 to 175°C	Axial	Active
1N5934BP-TP	Micro Commercial Co	24 V	±5%	1.5 W	19 Ω	1 µA @ 18.2 V	-55 to 175°C	DO-41	Active
1N970A	Microchip Technology	24 V	±10%	500 mW	33 Ω	5 µA @ 18.2 V	-65 to 175°C	DO-7	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

1N5252BTR (onsemi) — Recommended primary substitute. Identical electrical specifications to 1N970BTR with matching DO-35 package. Active product status with full temperature range coverage (-65°C to 200°C). RoHS3 compliant. Cut Tape packaging available.
1N5252B TR PBFREE (Central Semiconductor Corp) — Parametric equivalent with DO-35 package. Active status with full temperature range (-65°C to 200°C). RoHS3 compliant. Suitable for applications requiring lead-free compliance.
1N5252B (Microchip Technology) — Parametric equivalent with DO-35 package. Active status. Operating temperature range -65°C to 175°C (5°C reduction from original). RoHS non-compliant. Bulk packaging.

Similar Parts (Functional Substitutes with Package Changes):

1EZ24D5-TP (Micro Commercial Co) — Maintains 24 V, 500 mW, ±5% specifications. DO-41 package requires PCB layout modification. Operating temperature range -55°C to 150°C (reduced from original). Lower impedance (25 Ω vs. 33 Ω) provides improved regulation characteristics.
1N4749A (Lumimax Optoelectronic Technology) — 24 V, ±5% tolerance with increased power rating (1 W vs. 500 mW). DO-41 package. Full temperature range (-65°C to 200°C). Suitable for applications requiring higher power dissipation capability.
1N5075 (Microchip Technology) — 24 V, ±5% tolerance with significantly increased power rating (3 W). Axial package. Operating temperature -65°C to 175°C. Lowest impedance (10 Ω) for superior voltage regulation. Suitable for high-power applications.
1N5934BP-TP (Micro Commercial Co) — 24 V, ±5% tolerance with 1.5 W power rating. DO-41 package. Operating temperature -55°C to 175°C. RoHS3 compliant. Intermediate power option between 500 mW and 3 W ratings.

Not Recommended:

1N970A (Microchip Technology) — Tolerance specification ±10% exceeds the ±5% requirement of the original part. Operating temperature range reduced to -65°C to 175°C. DO-7 package differs from original. Use only when ±10% tolerance is acceptable.

Frequently Asked Questions (FAQ)

Q: Can 1N5252BTR be used as a direct replacement for 1N970BTR?

A: Yes. The 1N5252BTR is a parametric equivalent with identical voltage (24 V), tolerance (±5%), power rating (500 mW), impedance (33 Ω), and package (DO-35). It maintains the full operating temperature range (-65°C to 200°C) and is an active product from onsemi.

Q: What is the difference between 1N5252B and 1N5252BTR?

A: Both are parametric equivalents with identical electrical specifications. The primary difference is packaging: 1N5252B is supplied in bulk, while 1N5252BTR is supplied in cut tape format. The "TR" designation indicates tape and reel or cut tape packaging.

Q: Can I use 1N4749A (1 W) instead of 1N970BTR (500 mW)?

A: Yes, with package change consideration. The 1N4749A meets all electrical requirements (24 V, ±5%, full temperature range) with higher power capability. However, it uses a DO-41 package instead of DO-35, requiring PCB layout modification. Higher power rating does not degrade performance in 500 mW applications.

Q: Why does 1N970A have ±10% tolerance instead of ±5%?

A: The 1N970A is a different product variant with relaxed tolerance specifications. It is not recommended as a substitute when ±5% tolerance is a design requirement. Use only when application specifications permit ±10% voltage tolerance.

Q: What is the impact of using 1EZ24D5-TP with reduced operating temperature range (-55°C to 150°C)?

A: The 1EZ24D5-TP has a narrower temperature range than the original 1N970BTR (-65°C to 200°C). It is suitable only for applications operating within -55°C to 150°C. Verify application temperature requirements before selection.

Q: Is 1N5252B TR PBFREE RoHS compliant?

A: Yes. The 1N5252B TR PBFREE is RoHS3 compliant and lead-free. It is suitable for applications requiring RoHS compliance and lead-free manufacturing processes.

Q: Can I use 1N5075 (3 W) in place of 1N970BTR (500 mW)?

A: Yes. The 1N5075 meets all electrical requirements (24 V, ±5%, full temperature range) with significantly higher power capability (3 W). The axial package differs from DO-35, requiring PCB layout modification. The lower impedance (10 Ω) provides superior voltage regulation. Use when higher power dissipation or improved regulation is beneficial.

Q: What does "Parametric Equivalent" mean?

A: A parametric equivalent part matches all critical electrical specifications of the original component: voltage, tolerance, power rating, impedance, and operating temperature range. It provides direct functional replacement with identical performance characteristics.

Q: What does "Similar Part" mean?

A: A similar part meets the core functional requirements (24 V, ±5% tolerance) but may differ in secondary parameters such as power rating, impedance, temperature range, or package type. It provides functional substitution with acceptable variations for specific applications.

Q: Are all substitute parts through-hole components?

A: Yes. All listed substitutes are through-hole mounted components. The 1N970BTR and all equivalents use axial through-hole packages (DO-35, DO-41, or Axial form factors).

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